[Ffmpeg-devel-irc] ffmpeg.log.20131127

[burek]

[00:00] <Fusl> can someone tell me if there is a way to automatically fade out a pipe:0 stream on eof/socket-close?
[00:00] <Fusl> *fade out the audio
[00:00] <Rabbitt> ok, even better, there's a linux version of resolve
[00:00] <Rabbitt> .................
[00:08] <Rabbitt> ugh, enterprise level hardware w/ SAN, yuck.
[00:08] <Rabbitt> *shakes head*
[00:27] <Timothy_Gu> Fusl: not I can think of.
[00:28] <Fusl> i already thought that...
[00:28] <Timothy_Gu> Fusl: if you use fade, it has to know where is the end of the video
[00:29] <Timothy_Gu> Fusl: and with pipe you simply even don't know IF there is an end
[00:29] <Fusl> sure
[00:29] <Fusl> pipe eof's?
[00:29] <Timothy_Gu> You don't know that ahead of time
[00:30] <Fusl> how about if ffmpeg buffers the time specified in fadeout when reading from pipe:0 and fades out the audio when the pipe closes?
[00:33] <Timothy_Gu> Fusl: that is "patch welcome" ;-)
[00:34] <Fusl> which language is ffmpeg written in?
[00:36] <Timothy_Gu> Plain C99
[00:38] <Fusl> not really?
[00:41] <klaxa> yes really
[00:42] <Fusl> wtf
[00:42] <klaxa> what would you expect?
[00:42] <Fusl> java
[00:42] <Fusl> :D
[00:42] <klaxa> not really, right?
[00:42] <Fusl> not really, no
[00:42] <Fusl> :D
[00:43] <Fusl> ah there we go
[00:43] <Fusl> "FFmpeg is programmed in the ISO C90 language with a few additional features from ISO C99, namely: "
[00:43] <Fusl> never heard about ISO/Plain C99 or C90
[00:44] <klaxa> different C standards
[00:44] <Fusl> ah
[00:44] <Fusl> ok
[00:45] <klaxa> for example, for (int i = 0; i++; i < 100); is not valid in all C standards
[00:45] <klaxa> some require you to declare (and define) i outside of the for loop
[00:45] <Fusl> oh
[00:45] <Fusl> wow
[00:46] <Fusl> okay... i still don't know how to code c
[00:46] <Fusl> :O
[00:51] <Fusl> other question: is there a way to speed down the audio at the beginning and speed it up to normal speed after about 3 seconds stepwise?
[01:55] <vl4kn0_> Hi, when I "copy" a video using ffmpeg -i input.mp4 -c copy output.mp4, I get different tbn than the original video. Original has tbn=50 and the copy has tbn=12800. Why is that?
[01:57] <tommycannady> what is tbn ?
[01:57] <tommycannady> what value is that ?
[01:58] <tommycannady> : D "why yes, i am that" ;D
[02:00] <Fusl> Timothy_Gu: "Fusl: that is \"patch welcome\" ;-)" - I opened a trac-enhancement-ticket for this: https://trac.ffmpeg.org/ticket/3173#ticket ... Maybe someone has the time to implement this ..
[02:01] <Fusl> tommycannady: tbn = the time base in AVStream that has come from the container
[02:01] <Fusl> oh, Timothy_Gu left already
[02:01] <Fusl> .tell
[02:01] <Fusl> !tell
[02:01] <Fusl> wat
[02:02] <Fusl> tommycannady: http://ffmpeg-users.933282.n4.nabble.com/What-does-the-output-of-ffmpeg-mean-tbr-tbn-tbc-etc-td941538.html
[02:05] <ubuntuaddicted> has anyone every attempted to capture from a device node? i have an hd-pvr connected via usb and there is a module built into the kernel (hdpvr) but when I run the following command cat /dev/video1 | avconv -f mpegts -i - -c:v libx264 -preset veryfast -tune zerolatency -b:v 3500k -maxrate 3500k -bufsize 3500k -c:a libvo_aacenc -b:a 128k -y testfile.flv   stops after only a few seconds. it also starts with a bunch of errors. http://past
[02:05] <ubuntuaddicted> ebin.com/Lzu9R1GW
[02:14] <Samus_Aran> is there any way to make FFmpeg's "accurate seeking" accurate?  putting -ss after the -i still fails to accurately cut timestamps
[02:15] <Samus_Aran> I made a sample video that prints the frame number and exact timestamp each frame.  I haven't been able to re-encode only a certain range
[02:27] <Zeranoe> Is there a way to suppress the ffmpeg configure options when ruinning?
[02:28] <Zeranoe> Maybe loglevel?
[02:31] <llogan> "-loglevel quiet" will suppress everything
[02:32] <llogan> but why do you not wna tto show configure?
[02:32] <llogan> ubuntuaddicted: what's avconv?
[02:32] <ubuntuaddicted> lol, it's a fork of ffmpeg
[02:32] <ubuntuaddicted> not sure if you're being sarcastic
[02:33] <llogan> shouldn't you be asking for help at the form then?
[02:33] <llogan> *fork
[02:33] <Zeranoe> llogan: I'm running a encoder loop on lots of files, I don't need to print the configure info for every file.
[02:35] <llogan> warning or error might be better for you
[02:36] <llogan> ...and fatal
[02:40] <Zeranoe> llogan:
[02:41] <Zeranoe> llogan: Warn will do. I'm also using a fork that uses an older version of the source so -v is the option to use in that one. Is there any range for v?
[02:42] <llogan> i can't remember
[02:43] <ubuntuaddicted> llogan, i asked in the other chat room but no one is responding and just thought i'd ask here while waiting
[02:44] <llogan> ubuntuaddicted: you can quickly download, extract, and run a linux build of ffmpeg and try it. we can support that.
[02:44] <llogan> http://ffmpeg.org/download.html#LinuxBuilds
[02:45] <ubuntuaddicted> llogan, it won't mess up my kdenlive software? i rely heavily on that software for editing and rendering videos
[02:45] <llogan> no, it won't. it's just a static binary.
[02:46] <Zeranoe> ubuntuaddicted: Obviously make sure you run it from from the dir ./ffmpeg not ffmpeg
[02:46] <Zeranoe> unless of course you export the path before
[02:46] <llogan> talking about kdenlive, where did jb go?
[02:46] <ubuntuaddicted> llogan, i know right. haven't heard anything since around july
[02:47] <ubuntuaddicted> i'm worried it's going to die off. i feel it's the only feature rich NLE in linux to date
[02:47] <llogan> but if you export the path then kdenlive may use the exported one...i think it uses the cli tool and not the libraries
[02:47] <llogan> but i'm not sure
[02:47] <llogan> some people a stepping up it seems
[02:47] <llogan> or at least discussing it
[02:48] <llogan> i wonder if the nle from dan dennedy is usable
[02:48] <ubuntuaddicted> isn't he the mlt dev?
[02:48] <llogan> i forgot the name of it
[02:49] <llogan> i haven't tried lightworks either
[02:49] <Samus_Aran> there's Lightworks, if you don't care about open source
[02:49] <Samus_Aran> wait, it is open source, but not the video formats
[02:49] <ubuntuaddicted> i've heard of lightworks but it's not FOSS
[02:50] <ubuntuaddicted> well, you're right
[02:50] <llogan> oh, shotcut: http://www.shotcutapp.com/
[02:50] <Samus_Aran> you can buy licenses for h.264 etc.
[02:54] <ubuntuaddicted> hmmm, i wonder why he created shotcut and didn't just help improve kdenlvie
[02:55] <llogan> did you try the static build yet?
[02:55] <ubuntuaddicted> not yet, what is the reason there is static builds?
[02:56] <llogan> because this is #ffmpeg
[02:56] <llogan> and you may be encountering a bug from a buggy fork
[02:56] <llogan> and your fork does not help users, apparently
[02:56] <ubuntuaddicted> installing a static build using a PPA isn't going to update any other software that's installed from Ubuntu's Precise repo?
[02:57] <llogan> the PPA may interfere. not the static build
[02:57] <llogan> the PPA is also old
[02:57] <llogan> there is no "installing" with the static build
[02:57] <llogan> you just execute it
[02:58] <ubuntuaddicted> ok, i am running kernel 3.7.0-030700-generic which ffmpeg from that link should I install?
[02:58] <llogan> either
[02:58] <llogan> wget http://ffmpeg.gusari.org/static/32bit/ffmpeg.static.32bit.$(date +"%F").tar.gz
[02:58] <llogan> tar xzvf ffmpeg.static.32bit.$(date +"%F").tar.gz
[02:58] <llogan> ./ffmpeg -i /dev/video1 ...
[03:01] Action: llogan has to leave in 10 mins
[03:02] <ubuntuaddicted> i got the static build. the command I was suggested to run by the developer of simplesscreenrecorder was this cat /dev/video1 | ./ffmpeg -f mpegts -i - -c:v libx264 -preset veryfast -tune zerolatency -b:v 3500k -maxrate 3500k -bufsize 3500k -c:a aac -strict -2 -b:a 128k -y testfile.flv
[03:03] <llogan> try it without the cat
[03:03] <ubuntuaddicted> it starts the hd-pvr recording BUT then the hd-pvr light shuts off and the command appears frozen. here's the output http://pastebin.com/nd4wuxhw
[03:04] <ubuntuaddicted> i had to hit ctrl-c cause the command wasn't doing anything
[03:05] <llogan> what format(s) is this device outputting?
[03:05] <llogan> what if you use ffmpeg and not cat?
[03:05] <ubuntuaddicted> it's output a semi-modified multiplexed transport stream. h264/aac
[03:07] <ubuntuaddicted> the blue recording light does not light up unless i use cat.
[03:10] <llogan> try adding "-c:v h264" as an input option. does "v4l2-ctl --list-formats-ext" show the device?
[03:10] <ubuntuaddicted> llogan, here's me trying something very simple. http://pastebin.com/8hMSQAq4
[03:10] <llogan> that's the fake ffmpeg
[03:11] <ubuntuaddicted> llogan, oh yeah oops. well the fake one at least spits out info, this static build does nothing
[03:11] <Samus_Aran> why in the world does Ubuntu call the package ffmpeg if it's not?
[03:12] <ubuntuaddicted> Samus_Aran, i believe it's a transition package
[03:12] <llogan> because the debian maintainer is also a libav dev, and what better way to spread your FUD other than using that name
[03:12] <Samus_Aran> it appears to be a concerted effort to confuse people
[03:12] <llogan> later y'all
[03:13] <ubuntuaddicted> llogan, thanks for attempting to help me.
[03:13] <llogan> try ffmpeg-user mailing list if you don't get an answer here.
[03:15] <ubuntuaddicted> Samus_Aran, maybe you can help. i am trying to capture from an hd-pvr using ffmpeg
[03:15] <Samus_Aran> does the static ffmpeg run for you?
[03:16] <Samus_Aran> ./ffmpeg -version
[03:17] <Samus_Aran> ubuntuaddicted: you there?
[03:20] <Samus_Aran> ubuntuaddicted: was your goal to re-encode the stream or just copy it as-is (i.e. record something exactly)?
[03:20] <ubuntuaddicted> Samus_Aran, sorry i stepped away
[03:21] <ubuntuaddicted> Samus_Aran, the goal is to either re-encode and stream it to twitch OR capture it for desktop editing
[03:22] <Samus_Aran> okay.  first off confirm your static ffmpeg works: ./ffmpeg -version
[03:22] <ubuntuaddicted> Samus_Aran, i am working with the developer of simplescreenrecorder and I asked him he could incorporate capture from this hd-pvr BUT the trouble is that it's not like other usb video devices like UVC cameras and what not.
[03:22] <ubuntuaddicted> Samus_Aran, yes, it works. do you want the entire output?
[03:23] <Samus_Aran> just the version number at the top
[03:23] <ubuntuaddicted> Samus_Aran, ffmpeg version N-58456-ga9a3afe
[03:24] <ubuntuaddicted> Samus_Aran, can i ask a question about static builds
[03:24] <Samus_Aran> sure?
[03:24] <ubuntuaddicted> Samus_Aran, it's a static build because no other app can interface with it? cause I always see people going through hell to compile ffmpeg themselves. Heck, why wouldn't they just use this?
[03:25] <Samus_Aran> ubuntuaddicted: it only has open source functionality.  for instance if you want the best quality AAC encoder, you'll need to compile it yourself with lib_fdk_aac
[03:26] <ubuntuaddicted> Samus_Aran, oh, but can it encode to libx264 and mp3?
[03:26] <Samus_Aran> some libraries can't be distributed
[03:27] <Samus_Aran> you can check which ones yours supports with: ./ffmpeg -codecs | less
[03:27] <Samus_Aran> it will have lib264, I'm not sure about mp3
[03:27] <Samus_Aran> probably lame
[03:28] <Samus_Aran> ubuntuaddicted: the other reason why you might *not* want to use a static build is that it can use more RAM, especially if you are running multiple instances at the same time
[03:28] <Samus_Aran> dynamic compiles share libraries in RAM with other apps on the system
[03:28] <Samus_Aran> static is by far the easiest, though.  :)
[03:29] <ubuntuaddicted> Samus_Aran, ok, so if I fire up handbrake, kdenlive, kazzam, vlc, or parole media player, they couldn't use the static build i just put on my machine correct?
[03:30] <ubuntuaddicted> Samus_Aran, makes sense. static is perfect for these situations where i just need to test out some stuff before I go through the trouble of installing a dynamic build
[03:30] <Samus_Aran> if you put the static one (with all the libraries built in) somewhere in your $PATH it can be run by the system.  if you have another ffmpeg installed, you'd need to remove or replace it
[03:31] <Samus_Aran> you can also set the PATH just for one app, to use the static ffmpeg
[03:32] <Samus_Aran> but some video editors use the libraries and not ffmpeg directly
[03:32] <Samus_Aran> ubuntuaddicted: what is the FPS and resolution of your video device?
[03:33] <ubuntuaddicted> Samus_Aran, i can give you the full mediainfo on a captured .ts file. 1 second
[03:33] <Samus_Aran> you could try something like this: ./ffmpeg -f v4l2 -r 25 -s 640x480 -i /dev/video0 -codec copy out.mkv
[03:33] <Samus_Aran> see if it does anything useful  :)
[03:34] <Samus_Aran> that would just dump the stream into an mkv container
[03:35] <ubuntuaddicted> heres the full mediainfo of the file, that's when I use the cat command, to cat the device node. http://pastebin.com/K7HeH46T
[03:35] <ubuntuaddicted> Samus_Aran, it doesn't like that. http://pastebin.com/AF5nVbr5
[03:37] <Samus_Aran> 1280x720 @ 59.940, anyway
[03:39] <ubuntuaddicted> Samus_Aran, yes, it's good hd quality. it was the first hd capture device back in the day to capture hd tv.
[03:40] <ubuntuaddicted> Samus_Aran, and someone reverse engineered the driver from windows and got it committed into the main kernel back around 2.6.30 or something
[03:42] <Samus_Aran> and you're sure /dev/viedeo1 is correct?
[03:42] <ubuntuaddicted> Samus_Aran, yes, /dev/video0 is my webcam
[03:43] <ubuntuaddicted> Samus_Aran, looks like ffmpeg can't work with the pipe
[03:43] <Samus_Aran> ./ffmpeg -f v4l2 -framerate 59.940 -video_size hd720 -i /dev/video1 -codec copy out.mkv
[03:43] <ubuntuaddicted> Samus_Aran, v4l2 can not interface with this device
[03:43] <Samus_Aran> it seems very odd to me that a video4linux2 device wouldn't be usable
[03:44] <ubuntuaddicted> Samus_Aran, same error. [video4linux2,v4l2 @ 0x2a870c0] The device does not support the streaming I/O method.
[03:44] <ubuntuaddicted> /dev/video1: Function not implemented
[03:45] <ubuntuaddicted> Samus_Aran, not sure if this helps you at all learn about the device http://www.mythtv.org/wiki/Hauppauge_HD-PVR
[03:47] <ubuntuaddicted> Samus_Aran, here's the output that llogan told me to run eariler. it's a v4l2 --list-formats-extioctl http://pastebin.com/YCBH9aNz
[03:49] <ubuntuaddicted> Samus_Aran, any help would be greatly appreciated
[03:52] <Samus_Aran> it seems it's just a mpeg-ts stream, not sure what the -format name is, lemme see
[03:52] <Samus_Aran>  DE mpegts          MPEG-TS (MPEG-2 Transport Stream)
[03:52] <Samus_Aran>  D  mpegtsraw       raw MPEG-TS (MPEG-2 Transport Stream)
[03:52] <Samus_Aran> try one of those
[03:53] <ubuntuaddicted> Samus_Aran, i was trying ffmpeg -f mpegts earlier remember
[03:53] <Samus_Aran> I wasn't following earlier.  :)
[03:53] <Samus_Aran> what was the error?
[03:53] <Samus_Aran> I mean without cat
[03:53] <Samus_Aran> there shouldn't be any need for piping
[03:55] <Timothy_Gu> ubuntuaddicted: what's your original command output again?
[03:56] <ubuntuaddicted> Samus_Aran, the device starts to record but stops immediately and the command is frozen in the terminal
[03:56] <ubuntuaddicted> Timothy_Gu, ./ffmpeg -f mpegts -i /dev/video1 -c:v libx264 -preset veryfast -tune zerolatency -b:v 3500k -maxrate 3500k -bufsize 3500k -c:a aac -strict -2 -b:a 128k -y testfile.flv
[03:56] <ubuntuaddicted> brb
[03:57] <Timothy_Gu> What's the output?
[03:57] <Timothy_Gu> Is there any warnings/errors
[03:57] <Samus_Aran> ubuntuaddicted: that link with the v4l2 formats says that it is a motion jpeg device, with max framerate of 30fps?
[03:58] <Timothy_Gu> Also from your command line, the -c:a, the -strict, the -b:a all should not be needed (of course)
[04:01] <Timothy_Gu> Try this: ./ffmpeg -f video4linux2 -r 30 -s 640x480 -i /dev/video0 -c:v libx264 etc.
[04:02] <Timothy_Gu> Note the -f video4linux2
[04:02] <ubuntuaddicted> Samus_Aran, don't know what to tell you about that. i capture 59.94 FPS
[04:03] <Timothy_Gu> Ubuntuaddicted: your device simply canNOT capture 59.94
[04:03] <Timothy_Gu> Yours is max 30
[04:04] <ubuntuaddicted> Timothy_Gu, we tried that, it returns [video4linux2,v4l2 @ 0x3cb63a0] The device does not support the streaming I/O method.
[04:04] <ubuntuaddicted> /dev/video1: Function not implemented
[04:05] <ubuntuaddicted> Timothy_Gu, i don't know, that's what mediainfo -f returns. http://pastebin.com/Ptj9nG1x
[04:06] <Samus_Aran> perhaps try mjpeg
[04:06] <Timothy_Gu> What's the mediainfo about?
[04:06] <Samus_Aran> as that's what it says it is
[04:06] <ubuntuaddicted> Timothy_Gu, that's the media information of a file captured from the device
[04:06] <Timothy_Gu> Oh you are trying to use /dev/video1, not video0
[04:07] <Samus_Aran> ubuntuaddicted: ./ffmpeg -f mpegts -i /dev/video1 -codec copy test.mkv
[04:07] <Samus_Aran> ubuntuaddicted: does that work?
[04:07] <Timothy_Gu> The try -f v4l2 -c:v mjpeg -i /dev/video1
[04:08] <Timothy_Gu> Samus_Aran: I don't think that will work
[04:08] <Timothy_Gu> You have to tell ffmpeg that it is v4l2
[04:09] <ubuntuaddicted> Samus_Aran, it does work for about 40 seconds but again shuts itself off. here's the output http://pastebin.com/rYETud5r
[04:09] <Samus_Aran> Timothy_Gu: in the other command it was cat'ing /dev/video1 then using ffmpeg -format mpegts -i -, not sure
[04:09] <Samus_Aran> Timothy_Gu: but I don't know video capture much at all
[04:09] <ubuntuaddicted> Timothy_Gu, but as you saw by the error, this device does not support that.  [video4linux2,v4l2 @ 0x2a870c0] The device does not support the streaming I/O method.
[04:09] <ubuntuaddicted> <ubuntuaddicted> /dev/video1: Function not implemented
[04:10] <ubuntuaddicted> Timothy_Gu, i can capture from the device just fine by merely issuing cat /dev/video1 > video.ts
[04:10] <Samus_Aran> [matroska @ 0x3ee92a0] Error parsing AAC extradata, unable to determine samplerate.
[04:11] <Timothy_Gu> See also http://trac.ffmpeg.org/wiki/How%20to%20capture%20a%20webcam%20input
[04:11] <Samus_Aran> Timothy_Gu: it seems it's not a v4l2 device
[04:11] <Samus_Aran> I dunno.
[04:11] <Samus_Aran> ubuntuaddicted: it might be dying because of that audio error
[04:11] <Samus_Aran> ubuntuaddicted: what's the -ar?
[04:12] <ubuntuaddicted> Timothy_Gu, this is a special device and is not like a normal webcam UVC device
[04:12] <Timothy_Gu> Wait, how can video1 contain an audio stream
[04:12] <Samus_Aran> it says 48KHz
[04:13] <ubuntuaddicted> Timothy_Gu, because the device outputs a multiplexed teleport stream. see here: http://www.mythtv.org/wiki/Hauppauge_HD-PVR
[04:13] <Timothy_Gu> OK then.
[04:14] <Samus_Aran> ubuntuaddicted: ./ffmpeg -f mpegts -i /dev/video1 -ar 48000 -codec copy test.mkv
[04:14] <Samus_Aran> ubuntuaddicted: if that also dies, try using an .mp4 extension
[04:14] <Samus_Aran> not sure if the -ar needs to go before the -i
[04:15] <Timothy_Gu> Samus_Aran: that won't work cause changing ar NEEDS reencoding
[04:15] <Timothy_Gu> You have to put -ar to the front of -i
[04:15] <Samus_Aran> Timothy_Gu: how do you report the rate to Matroska?
[04:15] <Timothy_Gu> As I just said
[04:15] <Samus_Aran> I also said that.  :)
[04:15] <Timothy_Gu> Use -ar as an input option
[04:16] <Samus_Aran> ubuntuaddicted: ./ffmpeg -f mpegts -i /dev/video1 -codec copy test.mp4
[04:16] <Timothy_Gu> Another weird thing about the command line output is that it seems that you ^C'd it
[04:17] <Samus_Aran> ubuntuaddicted: use "q" to quit the encode early
[04:17] <Timothy_Gu> I don't know much about TS, but does TS put metadata in the front
[04:17] <Timothy_Gu> ?
[04:17] <Samus_Aran> ubuntuaddicted: though you said it died on its own, there's nothing in the output about it dying
[04:17] <Timothy_Gu> Yeah
[04:18] <ubuntuaddicted> Samus_Aran, because the command is frozen, it stopped working
[04:18] <ubuntuaddicted> the terminal command freezes
[04:18] <ubuntuaddicted> as well as the blue encoding light turns itself off on the device
[04:18] <Samus_Aran> is it using lots of CPU and RAM?
[04:18] <Timothy_Gu> Smells like a bug...
[04:18] <Samus_Aran> ubuntuaddicted: did you try the two commands I suggested?
[04:19] <Timothy_Gu> Try to send this to FFmpeg-user mailing list.
[04:19] <ubuntuaddicted> Samus_Aran,  trying to first 1 now, it's just sitting there doing nothing.
[04:19] <Samus_Aran> ubuntuaddicted: did you catch that the -ar needs to be before the -i?
[04:19] <Timothy_Gu> Or try to debug this your self using gdb
[04:19] <ubuntuaddicted> Samus_Aran, cpu is only 5% and ram is nill
[04:20] <Samus_Aran> ubuntuaddicted: if the device lets you cat it to a .ts, why don't you just... do that?
[04:20] <ubuntuaddicted> Samus_Aran, no, whats the exact command to try?
[04:20] <Samus_Aran> after you can put it into an .mp4 or .mkv container
[04:20] <ubuntuaddicted> Samus_Aran, because I want to stream it to twitch tv. that's an rtmp server
[04:20] <Samus_Aran> or .flv, whatever
[04:21] <Samus_Aran> ubuntuaddicted: ./ffmpeg -f mpegts -ar 48000 -i /dev/video1 -codec copy test.mkv
[04:21] <ubuntuaddicted> Samus_Aran, running this command ./ffmpeg -f mpegts -i /dev/video1 -codec copy test.mp4   and it just sits there, last line is libpostproc    52.  3.100 / 52.  3.100 and it does nothing. the blue light also did NOT turn on
[04:21] <Samus_Aran> hm
[04:21] <ubuntuaddicted> Samus_Aran, same thing, it just sits there.
[04:22] <Samus_Aran> what happens if you do: cat /dev/video1 > test.ts
[04:22] <Samus_Aran> ubuntuaddicted: does it ever crash?
[04:23] <ubuntuaddicted> Samus_Aran, still just sitting there at this line: libpostproc    52.  3.100 / 52.  3.100
[04:24] <Samus_Aran> that is really strange, that's not even getting to an error
[04:24] <ubuntuaddicted> Samus_Aran, hang on, now my cat command isn't even working. let me reload the module
[04:24] <Samus_Aran> I guess it is waiting for the device
[04:24] <ubuntuaddicted> Samus_Aran, i can't even unload it. ERROR: Module hdpvr is in use
[04:25] <ubuntuaddicted> will try to power it off
[04:25] <Samus_Aran> are there any ffmpeg's running still?
[04:25] <Samus_Aran> ps auxww|grep ffmpeg
[04:25] <Samus_Aran> rebooting would work, though might not be needed
[04:26] <ubuntuaddicted> Samus_Aran, i figured it out, had another terminal tab open with 1 of the commands running
[04:26] <Samus_Aran> ubuntuaddicted: okay, that might solve the v4l2 errors
[04:26] <Samus_Aran> ubuntuaddicted: try them again now
[04:28] <ubuntuaddicted> Samus_Aran, really? go all the way back to those commands? im positive it can't be used like that due to that error about ioctl or whatever it was
[04:28] <Samus_Aran> to anyone curious, I solved the frame-accurate cutting with this: -avoid_negative_ts 1 -vf 'select=gte(n\,250), setpts=PTS-STARTPTS' -to 3.00
[04:28] <Samus_Aran> 250 being the frame.
[04:28] <Samus_Aran> not sure if the negative ts is needed with the setpts
[04:29] <Samus_Aran> ubuntuaddicted: if a device is in use, and can only be opened once, it will error
[04:29] <ubuntuaddicted> Samus_Aran, yeap , i get this error [video4linux2,v4l2 @ 0x37fa2a0] The device does not support the streaming I/O method.
[04:29] <ubuntuaddicted> /dev/video1: Function not implemented
[04:29] <Samus_Aran> ubuntuaddicted: now try the mpegts .mp4 one
[04:30] <ubuntuaddicted> Samus_Aran, i don't believe this device works with v4l2
[04:30] <ubuntuaddicted> Samus_Aran, ok
[04:30] <ubuntuaddicted> Samus_Aran, blue light turned on, then the terminal returned Option sample_rate not found.
[04:30] <ubuntuaddicted>  and the blue light shut off
[04:31] <ubuntuaddicted> Samus_Aran, the attempted command was ./ffmpeg -f mpegts -ar 48000 -i /dev/video1 -codec copy test.mp4
[04:32] <ubuntuaddicted> Samus_Aran, I THINK I GOT IT
[04:33] <ubuntuaddicted> Samus_Aran, YEAP, it's still recording!!!!!!!
[04:34] <ubuntuaddicted> Samus_Aran, here's the entire terminal output. http://pastebin.com/KB7pEeVm  the command is this: ./ffmpeg -f mpegts -i /dev/video1 -codec copy test.ts
[04:38] <Samus_Aran> ubuntuaddicted: that's great.  it should work with .mp4 or .mkv as well now
[04:39] <ubuntuaddicted> Samus_Aran, the bad news is that my full command still results in the device shutting itself off
[04:40] <ubuntuaddicted> Samus_Aran, i see this error just before it shuts off. [adts @ 0x44cbc00] Encoder did not produce proper pts, making some up.  This is the command I am trying ./ffmpeg -f mpegts -i /dev/video1 -c:v libx264 -preset veryfast -tune zerolatency -b:v 3500k -maxrate 3500k -bufsize 3500k -c:a aac -strict -2 -b:a 128k -y testfile.ts
[04:46] <Samus_Aran> ubuntuaddicted: my nine month old daughter is here now.  :)  I'm afk, sorry.
[04:46] <Samus_Aran> ubuntuaddicted: maybe it's an issue with the buffer size or that zerolatency
[04:46] <Samus_Aran> -afk-
[04:47] <ubuntuaddicted> Samus_Aran, will look into those options now. THANKS for your help
[05:13] <vl4kn0_> Hi, when I "copy" a video using ffmpeg -i input.mp4 -c copy output.mp4, I get different tbn than the original video. Original has tbn=50 and the copy has tbn=12800. Why is that?
[06:17] <Samus_Aran> vl4kn0_: what is the tbn value?
[06:18] <vl4kn0_> Samus_Aran: container time base
[06:26] <Samus_Aran> "tbn = the time base in AVStream that has come from the container"
[06:26] <Samus_Aran> do you need it to stay the same?
[06:26] <Samus_Aran> is anyting wrong with the output otherwise?
[06:30] <vl4kn0_> Samus_Aran: I need it to stay the same.
[06:31] <relaxed> vl4kn0_: man ffmpeg-all| less +/copytb
[06:32] <relaxed> see if that helps
[06:32] <vl4kn0_> relaxed: I tried all copytb values and none of them helps
[06:35] <Samus_Aran> vl4kn0_: why is that?
[06:35] <vl4kn0_> Samus_Aran: why is what?
[06:36] <Samus_Aran> vl4kn0_: why do you care if it changes when you do a new container?
[06:36] <Samus_Aran> what problem is being caused?
[06:36] <Samus_Aran> also confirm the values using: ffmpeg -i file
[06:37] <Samus_Aran> "A timebase is like a clock, and indicates ticks per second. Generally, higher values are better."
[06:40] <vl4kn0_> Well, the real problem I'm having is, that I try to run some image recognition algorithms on a video. I use fps filter (that uses AVStream->time_base). When I run the algorithm on the original video I get certain values. Then, I cut the video using -ss and -t options and expect to get values that are contained within the original video (it is the same video after all), but the values change. I suspect it's because of different both dif
[06:40] <vl4kn0_> bitrate
[06:41] <Samus_Aran> anything after: "I suspect it's because of different both dif"?
[06:42] <Samus_Aran> vl4kn0_: what is an FPS filter?
[06:44] <vl4kn0_> Samus_Aran: FPS filter enforces frames per seconds, dropping all the frames that are not needed.
[07:03] <Samus_Aran> why not just set a framerate with ffmpeg?
[07:03] <Samus_Aran> vl4kn0_: I don't know how to fix the tbn, but if it can be done, it might be in the -vf select
[07:04] <Samus_Aran> I just learned about that one today for accurate frame-grabbing
[07:12] <Samus_Aran> it helps to fix timestamps, but I don't know if that is related.
[07:16] <Samus_Aran> just looked through the documentation for that one, doesn't look helpful.
[07:31] <Samus_Aran> 'TB' timebase of the input timestamps ... not sure if helpful, but they left.
[07:31] <Samus_Aran> night
[08:35] <Logicgate> is there a way to append to the video stream
[08:35] <Logicgate> I want to make the checksums of my videos with 1 variable byte.
[08:36] <Logicgate> changing the metadata isn't working since it's not in the video stream
[08:46] <viric> why? I don't know how to do that, but I'm curious
[11:12] <fahadash> Can we use ffmpeg to convert live-streaming formats ?
[12:04] <safyia> Hi all, i want to match part of the video to its original, buy comparing the rgb values of frames. I am trying to cut the video using ffmpeg, but comparing the cut part to the original the values are slightly different. What can cause this problem? When I play them they seem the same. Is ffmpeg setting some default parameters that change the output, even though i am using -c copy?
[12:18] <tiksa> could someone help me: how can I use setpts filter to show the first frame of video for x seconds and after that continue playing it normally?
[12:55] <jokar> Hello All
[12:55] <jokar> Anybody here that can help me about convert mpg to vob with audio?
[15:38] <vl4kn0> Hi, when using -ss option for input stream, the resulting video has negative pts, dts, pts_time and dts_time. How do I prevent this?
[16:31] <brontosaurusrex> how would map_metadata look like if i have say one flac (source) and one mp4 (target) and i'd like to copy paste metadata? (artist, performer, composer)
[16:32] <Chamunks-Away> I'm looking to twitch.tv stream a live feed from a "blackmagic intensity pro" over a DSL connection that could very likely only have a 1mbps if I'm lucky.   So given the somewhat limited / less then ideal hardware would I be insane to try and encode using some form of GPU accelleration to try and get the stream's bandwidth requirement down?
[16:33] <Mavrik> um
[16:33] <Mavrik> if you want LOW-BANDWIDTH, stay the heck away from GPU encoders
[16:33] <JEEB> Chamunks-Away, encoding with any kind of GPU related crap is never going to gain you any compression compared to a relatively sane CPU implementation
[16:33] <JEEB> GPUs are not made for video encoding as in the formats that are commonly used
[16:33] <Mavrik> you need to throw as much CPU as humanly possible into the stream to make it look good at low bandwidths
[16:34] <Mavrik> JEEB, well there are GPUs with dedicated H.264 encoders now ;)
[16:34] <Mavrik> still crap though.
[16:34] <chamunks> basically its a desktop stream from the output on an projector
[16:34] <JEEB> Mavrik, I do know about the ASICs :P
[16:34] <chamunks> Ideally I would like to mix in a frame with the webcam pointed at the presenter and the audio from the presenters mic as well but I'd settle for just the audio and desktop feed.
[16:35] <chamunks> i love how everyone knows the term ASIC since the whole bitcoin thing.
[16:36] <Mavrik> JEEB, yeah, just mentioning them... nVidia started throwing into their 6xx series a dedicated H.264 encoder which is slightly less crap than using CUDA/OpenCL based stuff
[16:36] <Mavrik> but... still a far cry from anything CPU related
[19:13] <bio-tty> is there a way to use -i %d.jpeg from several directories as one single input sequence?
[19:14] <bio-tty> let's say i want a video to be the sequential concatenation of a/%d.jpeg and b/%.jpeg so they should not be considered to separate inputs.
[19:15] <bio-tty> i could do mv a/*.jpeg b/*.jpeg tmp/ or with some renaming of the numbers, but i get so many files in one directory, and i also have to rename files apropriately.
[19:17] <bio-tty> it could have been -i dir_a/%d.jpeg,dir_b/%d.jpeg ...
[20:06] <brontosaurusrex> bio-tty, make temporary symlinks with correct naming and feed that to ffmpeg
[20:07] <brontosaurusrex> is what i would do
[20:12] <Zeranoe1> I'm using -minrate 100k -maxrate 100k -b:v 100k -bufsize 100k and the resulting video is still 1.7M/s
[20:13] <sacarasc> How big is your audio?
[20:16] <Zeranoe1> sacarasc: looks like the input is mp4a, 122k. The output is pcm_s16le
[20:18] <brontosaurusrex> Zeranoe, so you want your entire stream to be smaller than just input audio part?
[20:18] <Zeranoe1> input video is 1.7M/s h264/avc.
[20:19] <Zeranoe1> brontosaurusrex: I'm compressing the video in this step, not the audio
[20:22] <brontosaurusrex> Zeranoe, ok, iam lot, never-mind me.
[20:22] <brontosaurusrex> lost*
[20:23] <Zeranoe1> It looks like its the same output bitrate as the input
[20:31] <Zeranoe1> even with crf it's high. It's as if it's just ignoring my bitrate settings
[20:40] <Zeranoe1> llogan: http://pastie.org/8513051
[20:46] <brontosaurusrex> Zeranoe, thats bitrate including your pcm audio
[20:47] <Zeranoe1> brontosaurusrex: ffprobe: http://pastie.org/8513066
[20:48] <Zeranoe1> brontosaurusrex: with an the birate is 1.4M
[20:49] <brontosaurusrex> Zeranoe, right
[20:50] <Zeranoe1> brontosaurusrex: So that still far above 100k, which is the maxrate+bitrate
[20:51] <brontosaurusrex> so this is some sort of retarted mjpeg? according to http://en.wikipedia.org/wiki/AMV_video_format
[20:51] <brontosaurusrex> may i ask why would you encode into something like that?
[20:51] <Nickolai> Hi, I have successfully installed ffmpeg from source as shown in the compilation guide, but the console command ffmpeg isn't there. What's wrong? http://pastebin.com/rXABZZeB
[20:51] <Zeranoe1> brontosaurusrex: To play on special hardware
[20:51] <brontosaurusrex> quote " Video compression ratio is low – around 4 pixels/byte, compared with over 10 pixels/byte for MPEG-2"
[20:53] <brontosaurusrex> Nickolai, what OS are you on and what guide are you following?
[20:53] <Zeranoe1> brontosaurusrex: So your telling me it cant compress more than what its already doing?
[20:54] <brontosaurusrex> Zeranoe1, no, i have no idea is what i'am saying
[20:54] <Nickolai> brontosaurusrex: Ubuntu 13.04 64-bit, https://trac.ffmpeg.org/wiki/UbuntuCompilationGuide
[20:56] <brontosaurusrex> Nickolai,  without quotes: "~/bin/ffmpeg" says something?
[20:57] <Nickolai> brontosaurusrex: ffmpeg version 2.1.1 Copyright (c) 2000-2013 the FFmpeg developers...
[20:58] <brontosaurusrex> Nickolai, there you go, thats probably your compile
[20:58] <Nickolai> brontosaurusrex: shouldn't it install itself to run as when you type "ffmpeg"?
[20:59] <brontosaurusrex> they deliberately skip the install part in that guide, i guess to protect from any problems with the distro version of ffmpeg
[20:59] <brontosaurusrex> just guessing.
[20:59] <Nickolai> brontosaurusrex: how do I do this myself?
[20:59] <brontosaurusrex> Nickolai, hold on
[21:00] <brontosaurusrex> Nickolai, try: sudo checkinstall --pkgname=ffmpeg --pkgversion="5:$(date +%Y%m%d%H%M)-git" --backup=no --deldoc=yes --fstrans=no --default
[21:01] <brontosaurusrex> that should make a deb and install the thing
[21:02] <brontosaurusrex> other way would be to add your ~/bin to $PATH
[21:07] <Logicgate> how would one change the md5 checksum of an MP4 without corrupting it
[21:07] <Logicgate> i tried adding metadata
[21:08] <Logicgate> doens't work
[21:09] <zap0> scan for readable strings. change string.
[21:23] <llogan> the guide should deal with the path
[21:24] <llogan> Nickolai: don't use checkinstall
[21:26] <llogan> try ". ~/.profile" then run ffmpeg
[21:58] <Logicgate> is it possible to add metadata to a jpeg
[21:58] <Logicgate> with ffmpeg
[22:03] <llogan> Logicgate: maybe you can make an exif comment
[22:05] <Logicgate> with ffmpeg or do I have to use another program
[22:18] <llogan> Logicgate: probably another program like exiftool
[22:33] <Samus_Aran> anyone know where I can find out what -qscale is supposed to do with image output formats?
[22:34] <Samus_Aran> outputting to bitmaps with -qscale 100 is faster than -qscale 0 or 1, but there shouldn't be more than one way to write a bitmap
[22:35] <Samus_Aran> -qscale for jpeg changes quality.  not sure what it's doing for png or bmp.  is there a way to do uncompressed pngs?
[22:36] <Samus_Aran> I'm benchmarking to find the fastest image output mode where quality is no concern
[22:55] <llogan> i guess i shouldn't have assumed ubuntu has curl installed by default instead of wget...
[22:57] <Samus_Aran> I just install everything, then everyone's happy (except the people that want nothing installed)
[22:59] <llogan> wasn't a big deal. i just had to update an answer to a question
[23:08] <llogan> Samus_Aran: -qscale depends on the encoder. for example the range for mjpeg,mpeg4,mpeg2video,msmpeg*,flv,h263*,mpeg1video is a linearge of 1-31, IIRC
[23:09] <llogan> png compression can be set with -compression_level. I think...
[23:09] <llogan> a higher value is higher compression
[23:10] <llogan> s/linearge/linear range
[23:10] <Samus_Aran> llogan: thanks
[23:11] <Samus_Aran> what is -qscale supposed to do for lessless formats like png and tiff?  it changes the time to create the images
[23:12] <llogan> i don't know
[23:13] <Samus_Aran> okay, looking closely it appears to be lowering the output quality
[23:13] <Samus_Aran> odd
[23:14] <llogan> png seems to ignore qscale.
[23:14] <llogan> i don't understand what qscale would supposed to do for png
[23:15] <llogan> so ignoring it makes sense (althugh a message would be nice)
[23:23] <Samus_Aran> my mistake about the qscale affecting the pngs, it turns out the artifacts I was seeing were from scaling it down
[23:23] <Samus_Aran> then looking at it blown back up in my image viewr
[23:23] <Samus_Aran> *viewer
[00:00] --- Thu Nov 28 2013