[Ffmpeg-devel-irc] ffmpeg.log.20150318

[burek]

[00:00:44 CET] <new001> so does anybody know how to do this on windows? google dosn't
[00:17:32 CET] <BullHorn> hello
[00:17:46 CET] <BullHorn> wow
[00:18:04 CET] <BullHorn> this channel is surprisingly huge
[00:18:13 CET] <bryno> ffmpeg <3
[00:18:22 CET] <BullHorn> i guess it does a lot more than i think/know it does
[00:18:30 CET] <BullHorn> i only use it to convert some .flv's to .mp4
[00:43:04 CET] <swift110> hey all
[00:43:23 CET] <swift110> I would like to use ffmpeg to convert a video file to audio flac
[00:46:00 CET] <klaxa> ffmpeg -i input.mp4 -map 0:a -c:a flac output.flac
[00:46:07 CET] <klaxa> swift110: ^
[00:46:18 CET] <swift110> ok thanks
[00:50:12 CET] <debianuser> Hello. Is there some way to make ffmpeg print current bitrate? I'm looking for something like http://img.photobucket.com/albums/v71/UnknownVT/Zi8/Zi8_93011075p3.gif If I get the numbers I can build the chart with gnuplot, but how can I get the numbers? (any ideas are welcome)
[01:22:27 CET] <relaxed> debianuser: I think -vstats will dump the info to a file
[01:42:32 CET] <debianuser> relaxed: It seems to work during encoding only, i.e. I can't get that info for existing file (or at least I can't find how to use -vstats with ffprobe), but that should be enough for my test. Thank you!
[01:55:16 CET] <relaxed> debianuser: look at ffprobe's -show_packet
[01:55:31 CET] <relaxed> er, -show_packets
[02:04:27 CET] <relaxed> debianuser: ffprobe -show_frames -select_streams v:0
[02:11:26 CET] <debianuser> relaxed: That looks promising too. What's the difference between -show_packets and -show_frames? (is that multiple packets per frame? or multiple frames per packet?)
[02:13:59 CET] <debianuser> (I can see some frames even for mp3 files so I guess those are not video frames...)
[03:33:27 CET] <AndyPryor> Hello crew,  quick question if anyone would be kind enough to listen!  I'm muxing TS->MP4 and noticing 2 extra duplicate frames are showing up at the beginning of my mp4 file.  Is there any reason mp4 would duplicate frames,  or does this sound like an issue?  'ffmpeg -y -i input.ts -c:v copy output.mp4'
[07:02:04 CET] <ThreeByEight> Hi, trying to figure out the name of Linux binaries.
[07:03:15 CET] <relaxed> ThreeByEight: for what?
[07:03:27 CET] <ThreeByEight> So I can run locate to see if they're installed on this Linux machine.
[07:03:41 CET] <relaxed> which binaryname
[07:03:46 CET] <ThreeByEight> Any of them.
[07:04:04 CET] <relaxed> the command would be "which binaryname"
[07:04:29 CET] <ThreeByEight> Oh, doesn't 'locate' work also?
[07:04:46 CET] <ThreeByEight> Would you happen to know the name of any of the FFMPEG binary files?
[07:05:22 CET] <relaxed> locate would be a bit heavy handed for checking for binaries
[07:05:38 CET] <relaxed> ffmpeg, ffprobe
[07:05:53 CET] <ThreeByEight> Good point but I found what I was looking for. Just needed root access :)
[07:06:10 CET] <ThreeByEight> This list has got to be millions of lines long.
[07:09:06 CET] <ThreeByEight> Is anyone in here familiar with FFMPEG-PHP?
[07:09:10 CET] <ThreeByEight> BRB, BIO
[08:44:11 CET] <_3by8> Can someone in here please illuminate? If you were developing a website that sold videos but gave the customer the option of selecting file type and resolution, etc, would you rather store a copy of each file format locally or have the system transcode it on the fly with FFMPEG? I'm leaning towards local copies but please, illuminate me!
[08:50:59 CET] <relaxed> _3by8: customers don't like to wait
[08:51:44 CET] <_3by8> relaxed, you mean that transcoding would take longer, right?
[08:52:01 CET] <relaxed> yes
[08:54:23 CET] <_3by8> Yeah, I'm not sure what they were thinking.
[08:54:38 CET] <_3by8> It seems cool, I guess.
[09:17:44 CET] <lachezar_kamburo> Hello I am trying to concatenate two ismv files using this command : ffmpeg -i "concat:CameraStream1.ismv|CameraStream2.ismv" -c copy output.ismv . Here is the link for the log file http://pastebin.com/QAvnWu72
[09:18:08 CET] <lachezar_kamburo> please help me solve the problem ffmpeg community
[09:19:37 CET] <relaxed> lachezar_kamburo: did you see https://trac.ffmpeg.org/wiki/Concatenate  ?
[10:02:14 CET] <lachezar_kamburo> Yes i have checked the https://trac.ffmpeg.org/wiki/Concatenate
[10:02:23 CET] <lachezar_kamburo> I am doing exactly like the given example
[10:02:29 CET] <lachezar_kamburo> but it is nor working fine
[10:02:39 CET] <lachezar_kamburo> what am I doing wrong ?
[10:07:37 CET] <relaxed> look at the .mp4 example
[10:18:38 CET] <lachezar_kamburo> hello
[12:02:46 CET] <chuckl_> Hi there, when opening a RTSP stream, why can av_read_pause and av_read_play fail? ... They return -1 and the stream remains frozen
[14:53:02 CET] <beepbeep_> Hi all, I'm trying to segment a stream on disk using the following command: https://gist.github.com/aaronmu/37db13f3ef06de08e0ae#file-gistfile1-txt but something goes wrong when writing the header for output file. This is the output: https://gist.github.com/aaronmu/37db13f3ef06de08e0ae
[14:53:20 CET] <beepbeep_> Can anyone explain what is going wrong?
[15:06:31 CET] <cowai> Is a 512mb vps enough to relay (no encoding) 3 rtmp streams.  Are we talking 50mb per process, or 500mb?
[15:20:55 CET] <__jack__> beepbeep_: what is D:\recordings ?
[15:21:36 CET] <pterodactyl_hunt> hi folks. I'm trying to use image2 to put a bunch of jpgs into a video. I'm having trouble with the file name wildcard on windows
[15:21:44 CET] <__jack__> cowai: maybe, I stream something like that, took 100MB per ffmpeg
[15:22:50 CET] <pterodactyl_hunt> ffmpeg.exe -f image2  -i DSC_%04d.JPG video.mpg
[15:23:16 CET] <pterodactyl_hunt> do my files need to start at DSC_0000.JPG and increment from there?
[15:23:23 CET] <beepbeep_> __jack__, it's the output folder
[15:24:58 CET] <__jack__> beepbeep_: try D:\recordings\blabla%05d.ts
[15:26:03 CET] <__jack__> pterodactyl_hunt: I guess yes
[15:26:14 CET] <pterodactyl_hunt> i've answered my own question
[15:26:24 CET] <pterodactyl_hunt> ffmpeg.exe -f image2 -start_number 1171 -i DSC_%04d.jpg video.mpg
[15:27:53 CET] <cowai> __jack__: I am testing now, and it starts at around 50mb per process. but increases about 1% every 5 minutes.
[15:28:13 CET] <cowai> for a stable rtmp stream it should not increase right?
[15:28:33 CET] <__jack__> cowai: what is your line ?
[15:28:39 CET] <cowai> gigabit
[15:28:47 CET] <__jack__> I mean: your ffmpeg command
[15:28:50 CET] <cowai> haha
[15:28:52 CET] <cowai> 2 sec
[15:30:00 CET] <cowai> ffmpeg -re -i rtmp://origin -c copy -f flv rtmp://edge;
[15:30:21 CET] <__jack__> drop -re
[15:30:33 CET] <cowai> I have tried both with and without
[15:30:48 CET] <__jack__> (it is useless for live input)
[15:30:58 CET] <cowai> I thought that was its main use?
[15:31:30 CET] <__jack__> nope, it is usefull when you wanna stream a file : you won't stream it "as fast as possible", you want respect the bitrate
[15:31:47 CET] <cowai> ah
[15:31:59 CET] <__jack__> for a live, ffmpeg won't be feed too fast by the input (because .. it's live), so there is no need to limit itself
[15:32:11 CET] <cowai> yes
[15:32:13 CET] <cowai> makes sense
[15:32:38 CET] <cowai> origin server has a decklink sdi card. I needed to use -re on that one. But that is another thing.
[15:33:09 CET] <__jack__> cowai: maybe there is a leak in ffmpeg, try the latest version, try to see if it's really a leak (maybe it won't increase forever ? :D )
[15:33:35 CET] <cowai> like ffmpeg 2.6.1?
[15:33:49 CET] <cowai> I am using 2.6 right now
[15:33:59 CET] <__jack__> hum
[15:34:09 CET] <cowai> I have also tried libav11
[15:34:15 CET] <cowai> same story
[15:36:02 CET] <cowai> What I dont know is, if the measured ram use is actual used ram, or just used buffers/cache, which can be used for other processes.
[15:36:29 CET] <cowai> I am using ps aux|grep ffmpeg|awk '{ print $5}' to check usage over time.
[15:42:48 CET] <__jack__> cowai: that an idea, try nocache
[15:42:53 CET] <__jack__> nocache ffmpeg -i blabla
[15:44:40 CET] <cowai> I am using docker. Will that work you think?
[15:44:56 CET] <cowai> Maybe I would need to install it to the host also
[15:47:35 CET] <cowai> __jack__: "nocache - minimize filesystem caching effects"
[15:47:49 CET] <cowai> As I dont use the filesystem all that much I dont see why this could work.
[15:47:53 CET] <cowai> But I will try
[15:53:36 CET] <__jack__> cowai: it is talking about IO cache
[16:01:11 CET] <cowai> I need to go, but I started ffmpeg with nocache. It added about 30mb to each process. but it seems more stable right now. Lets wait and see.
[16:01:15 CET] <cowai> Thanks for the help
[16:38:32 CET] <Mista_D> Can FFmpeg's output be supressed except the filter reports (silence detect)?
[16:45:12 CET] <Mavrik> Mista_D, -v warning?
[16:45:14 CET] <Mavrik> something liek taht
[16:46:25 CET] <Mista_D> filter output is also supressed then...
[16:52:29 CET] <Silex> Hello! How feasible is it to extract images from a stream based on a *frame count* instead of a timestamp?
[16:53:09 CET] <Silex> e.g I record some stream that has 12 fps, and I want to extract frames 88-103 from it
[16:54:15 CET] <Silex> I guess you could translate to 88/12 to 103/12 and take care of the correct hours/minutes formatting but that doesn't sound accurate
[17:24:57 CET] <alxsp> should i be registred to post here?
[17:25:02 CET] <alxsp> ok.
[17:27:40 CET] <alxsp> the binary data can be easily converted to flac, stored this way and converted back.
[17:28:44 CET] <alxsp> but the data in such sound files will not survive the analogue transmission (via sound card)
[17:30:11 CET] <alxsp> are there codecs for ffmpeg with which the analogues transmission of sound would result  consistent data?
[17:57:48 CET] <c_14> Silex: use the select filter
[18:09:07 CET] <marci> hi guys
[18:09:47 CET] <marci> i have some troubles, im trying to install ffmpeg on windows
[18:10:03 CET] <marci> and somehow it doesn't work
[18:10:24 CET] <marci> i want it to install for apache
[18:12:29 CET] <Silex> c_14: thanks
[19:22:06 CET] <viric> Hi all
[19:22:39 CET] <viric> I have one video+audio recorded, and I want to replace the audio with that of another track (to-be-synchronised)
[19:23:10 CET] <viric> does anybody know any link where I can find some examples of proper handling of this situation?
[19:26:48 CET] <__jack__> viric: ffmpeg -i input1 -i input2 -map 0:v -map 1:a -c copy output.mkv, for instance
[19:28:44 CET] <viric> well, 1) I've to put them in synch, 2) I'd like to switch at specific times between one track and the other - depending on what microphone was closer to whatever speaker.
[19:29:07 CET] <viric> I'm used to the between() calls or so...
[19:29:33 CET] <viric> but I think it's quite a common case, and someone should have written about it. I don't know any search keywords that could help me find that though.
[20:07:54 CET] <BtbN> Hm, DASH muxed with ffmpeg stops working after a while. Now to find out if it's a problem with ffmpeg or the JavaScript DASH thing.
[20:10:56 CET] <Earthnail> Hey guys, having problems recording "http://s9.voscast.com:7850/;stream.nsv" with ffmpeg. Just times out. A curl on the headers shows it's a regular Icecast stream.
[20:11:26 CET] <Earthnail> here's an example command to reproduce it: ffmpeg -i "http://s9.voscast.com:7850/;stream.nsv" -t 10 -acodec libmp3lame -f mp3 -y test.mp3
[20:13:08 CET] <Earthnail> tried ffmpeg 1.2.4 and 2.4.3
[21:32:15 CET] <smo_> hi all i try to transcode a movie to my adsl box but i have this "grep stderr: Input stream #0:1 frame changed from rate:48000 fmt:fltp ch:6 chl:5.1 to rate:48000 fmt:fltp ch:6 chl:5.1(side)\n" and transcoding stop
[21:32:22 CET] <smo_> how can i prevent it ?
[21:32:25 CET] <smo_> please
[21:42:06 CET] <smo_> anyone please?
[21:45:42 CET] <nasojlsu> You need to post your entire input command along with the complete ffmpeg output to pastebin and someone will probably be willing to help
[21:50:12 CET] <bruce___> any plans to support DNxHR?  I'm looking for a decent codec for 1080p59.94 with relatively low complexity (compared to 264 intra... I need to encode several cameras in real time, which I do now w/ DHxHD)
[22:00:28 CET] <smo_> is it possible to force 5.1 and disable 5.1(side)
[22:00:33 CET] <smo_> ?
[00:00:00 CET] --- Thu Mar 19 2015