#1670: -filter_complex doesn't handle well finite video + infinite audio
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Reporter: ubitux | Owner:
Type: defect | Status: new
Priority: normal | Component: FFmpeg
Version: unspecified | Keywords:
Blocked By: | Blocking:
Reproduced by developer: 1 | Analyzed by developer: 0
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Given a 60 seconds video stream:
{{{
./ffmpeg -v 0 -f lavfi -i testsrc=d=60 -y video.mp4
}}}
and a 5 seconds audio stream:
{{{
./ffmpeg -v 0 -f lavfi -i 'aevalsrc=sin(440*2*PI*t)::d=5' -y audio.wav
}}}
We can make a video presentation of 60 seconds with the 5 seconds audio
padded with silence with the following command line:
{{{
./ffmpeg -f lavfi -i 'movie=video.mp4 [out0]; amovie=audio.wav [audio];
aevalsrc=0 [silence]; [audio][silence] concat=v=0:a=1 [out1]' -y out.avi
}}}
Unfortunately, this doesn't work with the -filter_complex option:
{{{
% ./ffmpeg -i video.mp4 -i audio.wav -filter_complex 'aevalsrc=0
[silence]; [1:0][silence] concat=v=0:a=1 [padded_audio]' -map 0:0 -map
'[padded_audio]' -y out.avi
ffmpeg version N-43791-g2c7a622 Copyright (c) 2000-2012 the FFmpeg
developers
built on Aug 21 2012 21:01:23 with gcc 4.7.1 (GCC) 20120721 (prerelease)
configuration: --enable-gpl --enable-fontconfig --enable-libfreetype
--enable-libmp3lame --enable-libvorbis --enable-libxvid --enable-libx264
--enable-libvpx --enable-libtheora --enable-x11grab --enable-libopenjpeg
--enable-libass --enable-libmodplug --enable-libv4l2 --cc='ccache
colorgcc' --samples=/home/ubitux/fate-samples --prefix=/tmp/ffinstall
libavutil 51. 70.100 / 51. 70.100
libavcodec 54. 54.100 / 54. 54.100
libavformat 54. 25.104 / 54. 25.104
libavdevice 54. 2.100 / 54. 2.100
libavfilter 3. 13.100 / 3. 13.100
libswscale 2. 1.101 / 2. 1.101
libswresample 0. 15.100 / 0. 15.100
libpostproc 52. 0.100 / 52. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf54.25.104
Duration: 00:01:00.00, start: 0.000000, bitrate: 37 kb/s
Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 /
0x31637661), yuv444p, 320x240 [SAR 1:1 DAR 4:3], 34 kb/s, 25 fps, 25 tbr,
25 tbn, 50 tbc
Metadata:
handler_name : VideoHandler
Guessed Channel Layout for Input Stream #1.0 : mono
Input #1, wav, from 'audio.wav':
Duration: 00:00:05.01, bitrate: 705 kb/s
Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono,
s16, 705 kb/s
Output #0, avi, to 'out.avi':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
ISFT : Lavf54.25.104
Stream #0:0(und): Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 320x240
[SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 tbn, 25 tbc
Metadata:
handler_name : VideoHandler
Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, mono, s16
Stream mapping:
Stream #1:0 (pcm_s16le) -> concat:in0:a0 (graph 0)
Stream #0:0 -> #0:0 (h264 -> mpeg4)
concat (graph 0) -> Stream #0:1 (libmp3lame)
Press [q] to stop, [?] for help
frame= 1500 fps=177 q=9.6 Lsize= 13088kB time=00:01:00.00
bitrate=1786.9kbits/s
}}}
This creates some kind of infinite loop, with fps slightly decreasing over
time (+memory leak)
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1670>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker
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