[Ffmpeg-devel-irc] ffmpeg.log.20130814

Thu Aug 15 02:05:01 CEST 2013

[01:57] <shoop_da_whoop> I'm having an issue transcoding an mpegts created with mythtv. The first keyframe is missing from the output file. However, the frame is present in both vlc, and a transcode created via vlc. I'm assuming that the problem lies in the video codec parameters.
[02:00] <shoop_da_whoop> Here's a pastebin with the command line and ffmpeg output. http://pastebin.com/T9KTrwQw
[02:26] <shoop_da_whoop> VLC decodes and plays the file properly. http://pastebin.com/RDDeqYin
[04:01] <DZII> Hello All
[04:03] <DZII> need some help if anyone can help after yasm part of install doc i ov on to x264 and on the configure part im getting Found no assembler
[04:03] <DZII> Minimum version is yasm-1.2.0 If you really want to compile without asm, configure with --disable-asm
[04:04] <shoop_da_whoop> I'm having an issue transcoding an mpegts created with mythtv. The first keyframe is missing from the output file. However, the frame is present in both vlc, and a transcode created via vlc. I'm assuming that the problem lies in the video codec parameters.
[04:04] <shoop_da_whoop> Here's a pastebin with the command line and ffmpeg output. http://pastebin.com/T9KTrwQw
[05:11] <DZII> http://pastebin.com/YjdKGQKq
[05:17] <shoop_da_whoop> Why does transcoding an mpegts stream to avi, then mkv correct a/v sync problems?
[05:25] <DZII> http://pastebin.com/DR4shxFT
[07:07] <Datalink> has anyone used ffmpeg to stream to Akami?
[07:24] <Datalink> http://illogicallabs.com/paste/00000008.txt
[15:22] <shoop_da_whoop> A file produced by re-muxing an mpegts to mkv has a/v synchronization issues. However, when the mpegts is converted into an avi then mkv, the synchronization problems are gone. Any ideas?
[16:32] <Demon_Fox> I seem to have a problem with "-f yuv4mpegpipe"
[16:32] <Demon_Fox> It does not produce a header
[16:32] <Demon_Fox> Though it will if I use -f y4m and write it to the hard drive
[16:33] <Demon_Fox> oops
[16:33] <Demon_Fox> I did not use -f y4m
[16:33] <Demon_Fox> I just used the extension
[16:36] <relaxed> Demon_Fox: You must have muxed it into a container. It works here. ffmpeg -i input -t 1 -f yuv4mpegpipe - 2>/dev/null | sed q
[16:36] <relaxed> YUV4MPEG2 W768 H432 F30000:1001 Ip A1:1 C420mpeg2 XYSCSS=420MPEG2
[16:36] <Demon_Fox> Here is what the file says
[16:37] <Demon_Fox> YUV4MPEG2 W1280 H720 F24000:1001 Ip A1:1 C444 XYSCSS=444
[16:37] <Demon_Fox> I need chroma 444 for a filter I am writing
[16:37] <Demon_Fox> I just need to figure out how to pipe it correctly
[16:38] <relaxed> That is the header, so what is the problem?
[16:38] <Demon_Fox> hmm
[16:38] <Demon_Fox> Could you do me one favor
[16:38] <relaxed> Just use -f rawvideo
[16:39] <Demon_Fox> Could you write a line to a video with the header you have except it needs chroma 444
[17:09] <zap0> i would not use a header.  i would do what relaxed just said
[18:50] <luc4> Hi! I just encoded a video using ac3 but it seems that there are interruptions in the audio. Is this command correct? ffmpeg -i video-2013-08-14-17-56-46.mp4 -vcodec h264 -preset veryslow -crf 22 -acodec ac3 video-2013-08-14-17-56-46_high.mp4 -threads 4
[18:51] <relaxed> -vcodec h264 --> -vcodec libx264
[18:52] <relaxed> remove -threads 4 (and ot goes before the output)
[18:52] <relaxed> it*
[18:53] <luc4> relaxed: I'll try that way, thanks
[19:15] <plm> Hi all
[19:53] <shoop_da_whoop>  I'm having an issue transcoding an mpegts created with mythtv. The first keyframe is missing from the output file. However, the frame is present in both vlc, and a transcode created via vlc. I'm assuming that the problem lies in the video codec parameters. Here's a pastebin with the command line and ffmpeg output. http://pastebin.com/T9KTrwQw
[19:53] <shoop_da_whoop> VLC decodes and plays the file properly. http://pastebin.com/RDDeqYin
[20:09] <jure> interesting.
[20:10] <jure> but you're not technically transcoding the file.
[20:10] <jure> you're merely remuxing it.
[20:10] Action: file can not be remuxed
[20:10] <jure> sorry, file. lol.
[20:11] <file> I get it a lot, keep on going
[20:11] <jure> there's something even funnier about your input command line vs. your output.
[20:12] <jure> you are ostensibly remuxing to matroska (.mkv).
[20:12] <jure> yet your output is named "output.mp4".
[20:12] <jure> are you being honest with us, shoop_da_whoop?
[20:13] <jure> you're not even here, heh.
[20:13] <DZII> Hello All
[20:15] <DZII> is there a work around or another how to doc on Compiling on 12.04.2 lts ?
[20:17] <luc4> relaxed: still here? Nothing changed after the change. Anything else I could be doing wrong?
[20:19] <luc4> Anyone who notices anything wrong in this command for transcoding? ffmpeg -i video-2013-08-14-17-56-46.mp4 -vcodec libx264 -preset veryslow -crf 22 -acodec ac3 -threads 4 video-2013-08-14-17-56-46_high_aac.mp4. The problem is that the resulting video has audio interruptions.
[20:23] <luc4> relaxed: wow& "nothing changed after the change" is really a paradox& :-D I mean with the fixed command
[22:24] <thinktink> Hello
[22:26] <thinktink> Can some1 help me install ffmpeg so that it, AND all the libraries, are available to all users including www-data (apache)?
[23:20] Last message repeated 1 time(s).
[23:24] <nellynel90> im trying to do ivtc but  this '-vf "fieldmatch=order=tff:combmatch=full, yadif=deint=interlaced, decimate"' crashes ffmpeg
[23:26] <nellynel90> sorry
[23:26] <nellynel90> brb
[23:30] <CalimeroTeknik> I'd like to destroy audio, changing the samplerate from 44.1kHz to 8kHz, for purposes
[23:30] <CalimeroTeknik> (educational!)
[23:30] <jure> -ar 8000
[23:30] <CalimeroTeknik> well, this errors, saying it's not supported
[23:31] <jure> not supported by what codec?
[23:31] <CalimeroTeknik> Impossible to convert between the formats supported by the filter 'Parsed_anull_0' and the filter 'auto-inserted resampler 0'
[23:31] <CalimeroTeknik> Error opening filters!
[23:31] <CalimeroTeknik> flac?
[23:31] <jure> flac :)
[23:31] <CalimeroTeknik> I'm using 48kHz flac as the source
[23:31] <jure> don't use flac
[23:31] <CalimeroTeknik> well, I tried vorbis
[23:31] <jure> and?
[23:31] <nellynel90> http://bpaste.net/show/ZDA2FYZ1oHTF70P6CNw7/
[23:31] <CalimeroTeknik> same thing!
[23:31] <jure> what about mp3?
[23:32] <CalimeroTeknik> let's see
[23:32] <CalimeroTeknik> -acodec mp3? same!
[23:32] <jure> the speex codec should support 8Khz
[23:33] <CalimeroTeknik> ffmpeg -i source.flac -ar 8000 -acodec mp3 /tmp/test.mp3
[23:33] <CalimeroTeknik> this errors to the same thing as above
[23:33] <CalimeroTeknik> er, -acodec speex produces the same result again
[23:34] <CalimeroTeknik> is my command wrong?
[23:34] <jure> usually the sample rate is set after you specify the audio codec you want to use
[23:35] <CalimeroTeknik> ffmpeg -i source.flac -acodec mp3 -ar 8000 /tmp/test.mp3 ’ no change!
[23:35] <jure> drop mp3
[23:35] <jure> speex definitely supports 8kHz
[23:36] <jure> just need to figure this out
[23:36] <CalimeroTeknik> s/mp3/speex/ doesn't help
[23:36] <jure> obviously you need the right file extension
[23:36] <jure> because that sets the muxer to be used
[23:36] <CalimeroTeknik> I tried spx
[23:36] <CalimeroTeknik> mkv?
[23:36] <jure> I don't know what it is
[23:36] <CalimeroTeknik> let's see
[23:37] <CalimeroTeknik> yep, it's .spx.
[23:37] <jure> ok, does it work?
[23:37] <CalimeroTeknik> not at all
[23:37] <jure> is your ffmpeg compiled with speex support?
[23:37] <CalimeroTeknik> the error I pasted earlier always happens
[23:38] <jure> let's see
[23:38] <CalimeroTeknik>  DEA.L. speex                Speex (decoders: libspeex ) (encoders: libspeex )
[23:38] <CalimeroTeknik> says ffmpeg -codecs |grep speex
[23:38] <jure> it could be that "ar" is the brute-force version of resampling
[23:38] <jure> isn't there aresample
[23:39] <jure> http://ffmpeg.org/ffmpeg-filters.html#aresample-1
[23:39] <jure> so -af aresample=8000
[23:40] <CalimeroTeknik> oh, this doesn't error anymore. compilation problem though(?)
[23:40] <CalimeroTeknik> ffmpeg: relocation error: /usr/lib/libavfilter.so.3: symbol swr_next_pts, version LIBSWRESAMPLE_0 not defined in file libswresample.so.0 with link time reference
[23:40] <jure> bwargh wtf
[23:41] <jure> library version mismatch I guess
[23:41] <CalimeroTeknik> uh well, the ffmpeg binary and this lib belong to the same package
[23:42] <CalimeroTeknik> but hum, I have an update, let's not consider this a problem until I apply it.
[23:42] <jure> just get a statically compiled ffmpeg
[00:00] --- Thu Aug 15 2013