[Ffmpeg-devel-irc] ffmpeg.log.20130924

[burek]

[01:55] <chocolate> I'd like to modify ffmpeg's mpeg1 video encoder (mpeg12enc.c) for personal use to encrypt the sign bits (for demonstrating the paper at www.cs.purdue.edu/homes/bb/security99.ps). But I can't figure out how to tell whether the current block is Y, Cb, or Cr, or if the encoder even distinguishes. Maybe I'm looking in the wrong spot.
[03:05] <smjd> ffmpeg -i front.wav -i back.wav -f lavfi -i aevalsrc=0 -filter_complex 'join=inputs=3:channel_layout=5.1:map=0.0-FL|0.1-FR|1.0-BL|1.1-BR|2.0-FC|2.0-LFE' -matrix_encoding dplii -ar 44100 -ac 2 -af volumedetect dplii.wav
[03:05] <smjd> Why isn't volumedetect doing anything?
[03:07] <Hfuy> Hello.
[03:08] <smjd> also, shouldn't  -filter_complex 'join=inputs=3:channel_layout=5.1:map=1.0-FL|1.1-FR|0.0-BL|0.1-BR|2.0-FC|2.0-LFE,aresample=osr=44100:matrix_encoding=dplii:ocl=stereo,volumedetect' do the same thing?
[03:08] <Hfuy> I have some ProRes quicktimes here which have four channel soundtracks (listed as "2F2R" by VLC). This causes my nonlinear editor to dislike them. Can I use ffmpeg to cut them down to just the two front channels, without reencoding the video?
[03:08] <smjd> [SWR @ 0x1dcb940] [Eval @ 0x7fffa6d21010] Undefined constant or missing '(' in 'stereo'
[03:08] <smjd> [SWR @ 0x1dcb940] Unable to parse option value "stereo"
[03:10] <smjd> 'ffmpeg -layouts' lists stereo as 'stereo', so I guess it shouldn't be expecting '2.0'
[03:14] <Hfuy> I've tried ffmpeg -i infile.mov -c:a copy -an outfile.mov but I still get no joy; I fear it needs exactly two channels.
[03:15] <Hfuy> Oh. -c:v copy rather
[03:22] <Hfuy> What does "Stream #0.2(eng): Data: stts / 0x73747473" mean?
[03:23] <Hfuy> I have this odd situation where the input file seems to have the audio as stream 0.0, whereas the output file has it as 0.1 (with the video as 0.0). Can I affect this?
[03:34] <Hfuy> Where is this "stts" data stream coming from?
[06:50] <Zeranoe> Is there any way to have FFmpeg listen to a tcp port and trigger a encode when packets are received?
[10:58] <BoR0> if I were to implement a "video buffering" indicator, where should I put this in ffplay? I firstly tried to wrap it around packet_queue_get but it isn't working as expected
[10:59] <bananaman> hi, could anyone tell me how i'd fix the 'my left ear loved this' problem?
[10:59] <bananaman> except it's a 2 person talking clip, and one's left and the other's right
[11:22] <mkozjak> hi
[11:22] <mkozjak> if i do `ffmpeg -i compr.mkv -i sub1.srt -i sub2.srt -f mpegts -vcodec h264 -acodec mp2 -scodec copy -map 0:0 -map 0:1 -map 1:0 -map 2:0 lala.mkv`
[11:22] <mkozjak> i can see subtitles in mediainfo, but they do not appear in any player
[11:23] <mkozjak> if i do ffmpeg -i compr.mkv -i sub1.srt -i sub2.srt  -map 0:0 -map 0:1 -map 1:0 -map 2:0 lala.mkv // then they appear correctly
[11:23] <mkozjak> and ideas?
[11:23] <mkozjak> any*
[11:23] <mkozjak> tried a few other scodec
[11:55] <relaxed> mkozjak: in the first command your output is axctually a mpegts file named with a matroksa extension.
[11:55] <relaxed> actually*
[11:56] <relaxed> And I don't think srt subs are supported in mpegts.
[18:06] <allengreen> I don't wanna "make install" to install x264 into system,  my x264 static library is in a relative path, how to build libx264 into ffmpeg?
[18:06] <vl4kn0> Hi, is this tutorial on obtaining PTS value from video frame still relevant? http://dranger.com/ffmpeg/tutorial05.html
[18:07] <vl4kn0> (when using avcodec_video_decode2)
[18:08] <allengreen> I just make x264, and dont't "make install", how to build x264 into ffmpeg?
[18:08] <allengreen> suppose I am a guest user, I can't "make install".
[18:10] <allengreen> fellows?
[18:38] <Mattias> allengreen: I'd assume you pass in the x264 binary path while configuring ffmpeg for compilation?
[18:38] <Mattias> Just a wild guess
[18:39] <Mattias> allengreen: http://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuide this might have something?
[18:41] <Mattias> allengreen: do you really have to build x264 into ffmpeg? can't you just add the x264 binary to your personal PATH and ffmpeg will find it?
[18:46] <GoaLitiuM> maybe just adding the x264 paths to cflags and ldflags would be enough?
[18:49] <allengreen> thanks, I will try.
[20:08] <viric> Is it normal to deinterlace 50fps to progressive 25fps?
[20:08] <viric> Couldn't I get 50fps deinterlaced?
[20:16] <LithosLaptop> sounds normal
[20:18] <klaxa> viric: that would make every frame show up twice
[20:18] <klaxa> unless you interpolate inbetween-frames, but you don't want that
[20:19] <viric> hm
[20:20] <viric> I've an interlaced video, that looks much softer if played in vlc (linear deinterlacer), than if I use ffmpeg with yadif.
[20:54] <durandal_1707> viric: yadif=1
[20:55] <viric> ah ok
[20:55] <viric> yes, man ffmpeg-filters
[20:56] <viric> is it likely that vlc is doing that? one frame per field?
[20:57] <viric> damn it. In fact I've been using mlt. Anyone masters mlt here?
[20:57] <viric> if I knew how to easily concatenate a dozen of videos, with fadeout/in of 1s between them  (audio and video)... I wouldn't use mlt.
[21:07] <viric> definitely, 50fps is much nicer
[21:11] <Willdude123> Hi
[21:12] <Willdude123> I've installed libmp3lame-dev and compiled FFMPEG as per https://trac.ffmpeg.org/wiki/UbuntuCompilationGuide However, VLC has this error message still http://pastie.org/8352565
[21:23] <durandal_1707> Willdude123: perhaps you did not installed it?
[21:23] <durandal_1707> perhaps vlc use libav* statically
[21:23] <Willdude123> I did. It seemed to work
[21:23] <Willdude123> IDK.
[21:23] <Willdude123> Is it worth just abandoning it?
[21:23] <Willdude123> I have no clue what to do
[21:24] <durandal_1707> see output of ldd path to vlc bin
[21:24] <Willdude123> Huh?
[21:25] <durandal_1707> or perhaps you need to rebuild vlc too
[21:25] <durandal_1707> and set it to use installed ffmpeg and not some other variant
[21:25] <durandal_1707> anyway the info you give is sparse
[21:26] <Willdude123> Oh sorry.
[21:26] <Willdude123> How do I rebuild VLC? I never "built" it so to speak.
[21:27] <durandal_1707> this is not #vlc
[21:28] <Willdude123> Sorry
[00:00] --- Wed Sep 25 2013