[Ffmpeg-devel-irc] ffmpeg.log.20140605

[burek]

[00:04] <llogan> synth_: yeah, nobody has tried it yet and i added FFmpeg to it somewhat recently
[00:05] <synth_> ohhh
[00:05] <synth_> brb gotta reboot
[00:38] <synth_> back
[01:42] <a1fa> hello, i am trying to convert bunch of dv files to mpeg to burn to pal-dvd, is there anything special i should use when ffmpeg convering them?
[01:42] <c_14> If you're focusing on pal-dvd you can use -target pal-dvd
[01:43] <a1fa> and it has default bitrate and etc?
[01:43] <c_14> bitrate, codecs, buffer sizes, the whole shebang
[01:43] <a1fa> shweeet
[01:43] <a1fa> ffmpeg -y -i input.dv -target pal-dvd output?
[01:44] <c_14> should be fine
[01:44] <a1fa> coolio
[01:44] <synth_> bah
[01:45] <a1fa> i tried to dvigrab them directly into pipe ffmpeg
[01:45] <a1fa> but ffmpeg was crashing like a drunk teenager
[01:46] <a1fa> grabbing from firewire camcorder
[01:48] <fflogger> a1fa, please use a pastebin site (like www.pastie.org or www.pastebin.com) to show your EXACT ffmpeg command and the COMPLETE console output. Please don't paste your scripts, just the exact ffmpeg command line from the console.
[01:49] <klaxa> fflogger0 seems outdated and redundant
[01:50] <c_14> Been here since yesterday, apparently. Not sure why.
[01:52] <a1fa> old athlons suck for ffmpeg ;(
[01:52] <klaxa> s/athlons/computers/
[01:52] <a1fa> 387M dv file to pal-dvd took user    1m5.485s
[01:53] <a1fa> input     Stream #0:0: Video: dvvideo, yuv411p, 720x480 [SAR 32:27 DAR 16:9], 28771 kb/s, 29.97 tbr, 29.97 tbn, 29.97 tbc
[01:53] <a1fa> output     Stream #0:0: Video: mpeg2video, yuv420p, 720x576 [SAR 64:45 DAR 16:9], q=2-31, 6000 kb/s, 90k tbn, 25 tbc
[01:53] <a1fa> is that going to look wierd?
[01:54] <klaxa> try to play it back, if it doesn't look weird, it doesn't look weird
[01:55] <a1fa> no looks fine
[01:55] <a1fa> on 720p.. but they are taking this to europe.. not sure if they have 720p over there
[01:56] <a1fa> so i bet it will get stretched to fit their screen
[01:56] <a1fa> anyone know of a vhs player with firewire?
[01:56] <sacarasc> 720x576 is not 720p, it's 576p, if progressive.
[01:56] <a1fa> i need to convert old family tapes to dvd
[01:56] <a1fa> sacarasc: i played it on a computer with 720p output
[01:57] <c_14> the output you're creating is anamorphic with a dar of 16:9
[01:57] <a1fa> good or bad?
[01:57] <sacarasc> And over here, we only have 4k, we don't do lower.
[01:58] <a1fa> where is there?
[01:58] <klaxa> europe
[01:58] <a1fa> lol
[01:58] <sacarasc> Yes.
[01:58] <a1fa> i wonder if i should burn these mpegs as dvd format, or burn them as DVD-File
[01:59] <a1fa> %Cpu0  : 65.2 us,  5.6 sy,  4.6 ni, 23.8 id,  0.3 wa,  0.3 hi,  0.0 si,  0.0 st
[01:59] <a1fa> %Cpu1  : 61.3 us,  5.3 sy, 10.3 ni, 22.5 id,  0.3 wa,  0.3 hi,  0.0 si,  0.0 st
[01:59] <a1fa> blah
[02:03] <a1fa> well, i just effed up on the conversion, and need to start the capture all over
[02:03] <a1fa> i am going to try dvgrab into ffmpeg
[02:05] <a1fa> looks like its not possible
[02:05] <a1fa> to do a dvgrab
[02:15] <thebombzen> a1fa: FFmpeg supports dv1394 FireWire grabbing
[02:15] <thebombzen> directly from FFmpeg
[02:54] <llogan> a1fa: dvgrab to ffmpeg should work fine: dvgrab -size 0 -noavc - | ffmpeg -i - <other junk> output
[02:54] <llogan> or something like that
[02:55] <llogan> or try the suggestion from thebombzen. or just grab the files with dvgrab and encode those. that will give you the advantage of being able to re-encode if you screw up.
[06:11] <bornpilot> so doing some work with mpegts segments what is a global header?
[06:13] <bornpilot> I see it the docs with ssegments or stream_segments but what are they?
[07:00] <bornpilot> so doing some work with mpegts segments what is a global header?
[07:00] <bornpilot> 11:13
[07:00] <bornpilot> I see it the docs with ssegments or stream_segments but what are they?
[07:01] <bornpilot> have you contribted to an open source project?
[07:46] <Guest2333> Hi, I'm trying to understand how to get truepeak info from ffmpeg. cmd: ffmpeg -nostats -i A00010-01.wav -filter_complex "ebur128" -f null -     this works, but I'm not sure how to add truepeak to the output?
[11:07] <fresh1> Hi, I'm using ffmpeg for real-time encoding and want to get thumbnail from input-video stream every period of time. I've tried to use thumbnail filter with parameter n =ª  50 (thumbnail=50). And on my cpu (Intel(R) Xeon(R) CPU @ 3.47GHz stepping 02) using this filter increases average cpu usage for 5%-10% --- this very high value I thinª k. Can you suggest me how can I reduce CPU usage and achieve the
[11:07] <fresh1> same goal? My global filter looks like: [#0x110]yadif,split=2[vidin][thumbin];[vidin]scale=1920:1080[vª idout];[thumbin]thumbnail=50[thumbout] gop size 75 and I'm using preset "fast", high profile; MP2 --> H.264
[11:09] <fresh1> Sorry, copy-pasted from vim...  Hi, I'm using ffmpeg for real-time encoding and want to get thumbnail from input-video stream every period of time. I've tried to use thumbnail filter with parameter n = 50 (thumbnail=50). And on my cpu (Intel(R) Xeon(R) CPU @ 3.47GHz stepping 02) using this filter increases average cpu usage for 5%-10% --- this very high value I think. Can you suggest me how can I reduce CPU
[11:09] <fresh1> usage and achieve the same goal? My global filter looks like: [#0x110]yadif,split=2[vidin][thumbin];[vidin]scale=1920:1080[vidout];[thumbin]thumbnail=50[thumbout] gop size 75 and I'm using preset "fast", high profile; MP2 --> H.264
[11:20] <fresh1> quit
[11:55] <thshdw> can ffmpeg create a master_playlist.m3u8 from variant_playlists.m3u8? I'm attempting to do this through this command http://pastebin.com/3if48fPm but its only segmenting variant_500k. the other variant variant_150k does not get segmented.
[15:13] <termos> thshdw: don't think so, i'm currently making a master playlist myself and I ended up creating it myself
[15:14] <termos> it does make the Manifest file for smoothstreaming though, which is nice
[17:29] <obelix666> hi what is the shortest clip that ffmpeg can transcode? I am getting inconsistent results for clips around the 50ms mark and just wondering if there is a hard lower limit.
[17:30] <JEEB> there shouldn't be
[17:30] <JEEB> I mean, one sample is the minimum I'd guess
[17:30] <JEEB> and then there's the exceptions where someone was lazy with a third party library wrapper
[17:30] <JEEB> I think the libx265 wrapper doesn't output anything if you don't give it enough pictures
[17:31] <obelix666> sometimes i get only an audio track out and sometimes only a video track out
[17:31] <obelix666> using libx264
[17:33] <JEEB> the libx264 wrapper should handle even a single picture just fine
[17:34] <JEEB> unless someone broke it lately
[17:35] <JEEB> in other words, as long as something gets decoded/read, it should also get output (except for possible exceptions, but those should be rather rare)
[17:41] <kmacleod> obelix666, JEEB, I've just been doing something like that and x264 is telling me it has read 36 input frames before handing me any
[17:41] <kmacleod>     Stream #0:0, 36, 1/90000: Video: h264 (High), yuv420p, 720x480, 1/60, 30 fps, 30 tbr, 90k tbn, 60 tbc
[17:41] <JEEB> yes, but it should still give them all to you
[17:42] <JEEB> and it depends on the settings
[17:42] <JEEB> as well as if there is no more frames it should still work
[17:42] <JEEB> only the libx26_5_ wrapper should be broken with this
[17:42] <JEEB> not the libx264 one
[17:44] <kmacleod> avformat_find_stream_info() seems to be the one eating all the initial frames.  there may be a way to pull the processed frames but I haven't looked for it.
[17:44] <JEEB> no need for that
[17:44] <Fjorgynn> this ffmpeg tool is awesome
[17:45] <Fjorgynn> you should try it
[17:45] <JEEB> it will then start from the beginning of the buffer after it has probed the stream
[18:08] <thshdw> @termos Did you make each stream individually? Or were you able to make you multiple streams off one command line command?
[18:38] <ChocolateArmpits> Is it possible to seek if frames, rather than timecode, in ffmpeg without segmenter ?
[19:14] <BtbN> Is it possible to take 5 videos, and "interleave" their frames? So that when i have the 5 videos "a0, a1, a2, ...", "b0, b1, b2, ...", ...  i end up with a single video with a frame order of "a0, b0, c0, d0, e0, a1, b1, c1, d1, e1, a2, ..."?
[19:29] <llogan> ChocolateArmpits: you can try the select filter. maybe something like select='gte(n\,1234)'
[19:35] <BtbN> Hm, seems like that's not possible at all
[19:36] <BtbN> maybe with a crazy avisynth script, but that seems to be windows-only
[20:05] <ChocolateArmpits> BtbN, it should be possible if you first output all your videos  as an image sequence to separate folders and then perform a renaming procedure so that the frames will fall into their place all due to their names.
[20:12] <theekoz> on my mac Say I'm trying to have my input video on my second drive, it won't let me run the commandline when I drag the file into terminal
[20:12] <pzich> I missed that BtbN was someone's nick, and was trying to figure out what the hell that stood for
[20:12] <theekoz> anyone know the right command to access from a second HD
[20:13] <pzich> /Volumes/<drivename/... ?
[20:13] <theekoz> yea
[20:13] <theekoz> that's what's not working
[20:13] <llogan> you can drag files into the os x terminal?
[20:13] <theekoz> yes
[20:13] <theekoz> turns it into the path
[20:13] <llogan> blasphemy.
[20:17] <llogan> BtbN: "-filter_complex framepack=frameseq" might be worth a try
[20:23] <llogan> BtbN: or maybe http://ffmpeg.org/ffmpeg-filters.html#interleave_002c-ainterleave
[20:41] <dogitu> is there a reason that ffmpeg would print a partial x264 build number (e.g. x264 core 142 rather than x264 0.142.2431) in it's .mkv output (on linux)?
[20:49] <ChocolateArmpits> llogan: What does the "n\" stand for? Currently evaluated frame?
[20:50] <llogan> http://ffmpeg.org/ffmpeg-filters.html#select_002c-aselect
[20:50] <llogan> The (sequential) number of the filtered frame, starting from 0.
[20:51] <ChocolateArmpits> Oh strange, overlooked that
[20:51] <ChocolateArmpits> thanks
[20:55] <rsevero> Hi. How can I set a alsa virtual device as input for ffmpeg? By "virtual device" I mean the ones defined in .asoundrc for example. The ones listed by "arecord -L" not the ones listed by "arecord -l".
[20:58] <pzich> http://www.ffmpeg.org/ffmpeg-devices.html#alsa ?
[20:58] <rsevero> Well, it's simple after all. Just use "plug:DEVICE_NAME".
[20:59] <rsevero> pzich: I can't find the info I want on the page you sent but I believe the solution I just posted works. Thanks anyway.
[20:59] <llogan> https://trac.ffmpeg.org/wiki/Capture/ALSA has some additional into
[20:59] <llogan> *info
[21:04] <PoWeRKiLL> Hi
[21:04] <PoWeRKiLL> How can I detect the presence of an image in a video ?
[21:05] <pzich> an image?
[21:07] <PoWeRKiLL> like a logo in a video
[21:13] <rsevero> PoWeRKiLL: take a look at the OpenCV library.
[21:17] <PoWeRKiLL> Yes I'm looking on it I was asking myself if someone can point me out
[21:20] <BtbN> ChocolateArmpits, that would propably be too big for any of my disks to hold
[21:20] <BtbN> each h264 video alone is several GB in size
[21:21] <BtbN> llogan, hm, interleave would propably shuffle the frames, as they have the same timestamp each time
[21:25] <BtbN> also: [AVFilterGraph @ 0000004A734D5DA0] Too many inputs specified for the "interleave" filter.
[21:27] <llogan> that means little without any context
[21:27] <BtbN> well, 5 inputs is simply too much for the interleave filter
[21:28] <BtbN> framepack with frameseq also is quite hardcoded for two input videos
[21:28] <llogan> did you set nb_inputs for interleave?
[21:29] <BtbN> oh, missed that option
[21:30] <llogan> this is an example of why we are always so insistant on seeing the command and complete console output instead of just a segment of the console output
[21:30] <pzich> in general, it's best to paste (not here, use pastie.org or something) the whole command you ran and the output from ffmpeg.
[21:30] <BtbN> Well, now it seems to be doing something
[21:31] <BtbN> no error yet, it's eating up ram and cpu
[21:31] <BtbN> no output at all so far
[21:31] <ChocolateArmpits> llogan: select filter doesn't seem to work with frame numbers in hundred thousands. Many of the videos I deal with are around 2 hours long, sometimes longer. Specifying frame number of 233,000 gave me an error "Too large number of skipped frames 223000 > 60000"
[21:31] <BtbN> i hope it doesn't try to decode all 5 videos in ram
[21:31] <llogan> BtbN: just encode a few seconds with -t. it should be ovious if it works as expected or not
[21:32] <llogan> ChocolateArmpits: i don't know what else to recommend for that
[21:34] <ChocolateArmpits> I found suggestions to use pkt_dts_time from ffprobe for frame times, but on some videos it's adjusted by "start time" which makes the number not the duration number
[21:34] <BtbN> this is strange. i cut the input clips a little shorter, but the output file keeps growing and growing, way bigger than the input file sizes combined.
[21:34] <llogan> ChocolateArmpits: try the mailing list i guess
[21:34] <BtbN> That's the command: ffmpeg -i cam5.avi -i cam4.avi -i cam3.avi -i cam2.avi -i cam1.avi -filter_complex "[0:v][1:v][2:v][3:v][4:v] interleave=n=5" -t 1 out.mp4
[21:34] <ChocolateArmpits> BtbN: that's because there are more frames
[21:34] <ChocolateArmpits> combined
[21:35] <pzich> 5x, it seems
[21:35] <BtbN> hm? combinding 4 1MB files should never generate a 500MB output file
[21:35] <BtbN> -d
[21:35] <pzich> is it actually that extreme?
[21:35] <BtbN> *5 1MB files
[21:35] <BtbN> yes
[21:35] <ChocolateArmpits> You didn't specify encode settings it seems
[21:36] <ChocolateArmpits> What does it say in the output?
[21:36] <BtbN> no output at all
[21:36] <ChocolateArmpits> There should be something, there "Input" section and then there's "Output" section in the CLI
[21:36] <pzich> not even the copyright and config stuff?
[21:36] <BtbN> nope, nothing
[21:36] <pzich> and that's the complete command you're running?
[21:36] <BtbN> yep
[21:37] <pzich> did you by chance alias ffmpeg to add silent flags?
[21:37] <BtbN> no, running ffmpeg alone or cutting the files shorter worked fine
[21:38] <BtbN> If i set the loglevel to verbose i get this: http://bpaste.net/show/mxHvPnRKDOH3zxtnoM9f/
[21:38] <BtbN> stopping exactly where the paste stops
[21:40] <ChocolateArmpits> ""Output #0, mp4, to 'out.mp4':   Metadata:     encoder         : Lavf55.33.100     Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 1000k tbn, 1000k tbc (default)"
[21:40] <ChocolateArmpits> this is your output
[21:40] <BtbN> yeah, looks ok except for it never stopping to fill it
[21:43] <BtbN> i think i'll have to write a small programm to do this
[21:44] <llogan> why do you want to show the frames like this?
[21:44] <BtbN> It's for an autostereoscopic 3D display which combines 5 camera angles
[21:45] <ChocolateArmpits> if this isn't working out for you, as per my previous suggestion, output each video to an image sequence and write a bash script with two for loops to rename the image sequences
[21:45] <BtbN> Well, the full video is 2 hours long
[21:45] <ChocolateArmpits> then combine the whol sequence into a video with ffmpeg again
[21:46] <ChocolateArmpits> of each camera?
[21:46] <BtbN> yep
[21:46] <llogan> someone has probably done this with avisynth
[21:47] <ChocolateArmpits> BtbN previously said he's no on windows
[21:47] <ChocolateArmpits> not*
[21:47] <BtbN> I'm at home now, i have windows here, but the combine script should ultimately run on a linux box
[21:48] <llogan> works fine with wine
[21:49] <BtbN> hm, i don't think that would get accepted
[21:49] <ChocolateArmpits> Do you need the final video same length (2 hours)?
[21:50] <BtbN> yeah, the display is running at 5 times 24/30/60 hz
[21:52] <llogan> there is avxsynth for linux, but i know nothing of it, or if it is stil active, or even usable
[21:52] <JEEB> it was posted and left there to wither
[21:52] <JEEB> basically it ran that one thing that was never released in public by netflix or whatever that did the porting of the old version of avs
[21:52] <JEEB> and that's it
[21:52] <JEEB> vapoursynth is much better for video if you need something like avs that is cross-platform
[21:53] <JEEB> or just run avs 2.6.x under wine
[23:09] <audio_question> hi guys! i managed to "encrypt" a mpeg1 video file by xoring some pixels with a value (etc...) and i want to encrypt as well the audio part of that video. can u tell me what is the source from libavcodec that i should modify in order to edit audio mp2 encoding/decoding?
[23:15] <audio_question> hi guys! i managed to "encrypt" a mpeg1 video file by xoring some pixels with a value (etc...) and i want to encrypt as well the audio part of that video. can u tell me what is the source from libavcodec that i should modify in order to edit audio mp2 encoding/decoding? can any1 help me pls?
[23:50] <llogan> JEEB: i see. i can never remember the details of all of the variants
[00:00] --- Fri Jun  6 2014