[FFmpeg-trac] #5672(ffmpeg:new): concat demuxer truncates output duration

FFmpeg trac at avcodec.org
Tue Jun 28 00:45:25 CEST 2016


#5672: concat demuxer truncates output duration
----------------------------------------+----------------------------------
             Reporter:  jseeley78       |                     Type:  defect
               Status:  new             |                 Priority:  normal
            Component:  ffmpeg          |                  Version:  3.0.2
             Keywords:  concat demuxer  |               Blocked By:
             Blocking:                  |  Reproduced by developer:  0
Analyzed by developer:  0               |
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 Summary of the bug:
 The Concat demuxer is truncating output; I didn't start seeing this until
 moving to version 3.0.2. Normally I'm joining multiple files, but for
 simplicity the steps below are using the concat demuxer with a single
 file. The source file is about 90secs, but after running via the concat
 demuxer the output is only 7secs. ffmpeg lists the error 'concat.txt:
 Invalid argument' however I am getting a 0 exit code.

 How to reproduce:
 {{{
 ffmpeg -f concat -i concat.txt -c copy -y output.flv
 ffmpeg version 3.0.2 Copyright (c) 2000-2016 the FFmpeg developers
   built with gcc 4.9.2 (Debian 4.9.2-10)
   configuration: --prefix=/usr --extra-version=streamme --build-
 suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
 --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --disable-debug
 --disable-shared --enable-static --extra-cflags=--static --enable-gpl
 --disable-stripping --disable-decoder=libopenjpeg --disable-
 decoder=libschroedinger --enable-avresample --enable-avisynth --enable-
 gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b
 --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig
 --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm
 --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-
 openal --enable-libopus --enable-libpulse --enable-librtmp --enable-
 libschroedinger --enable-libshine --enable-libsnappy --enable-libspeex
 --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis
 --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265
 --enable-libxvid --enable-libzvbi --enable-opengl --enable-nonfree
 --enable-libfdk-aac --enable-libx264 --enable-x11grab --enable-libdc1394
 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264
 --enable-libopencv
   libavutil      55. 17.103 / 55. 17.103
   libavcodec     57. 24.102 / 57. 24.102
   libavformat    57. 25.100 / 57. 25.100
   libavdevice    57.  0.101 / 57.  0.101
   libavfilter     6. 31.100 /  6. 31.100
   libavresample   3.  0.  0 /  3.  0.  0
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.101 /  2.  0.101
   libpostproc    54.  0.100 / 54.  0.100
 [flv @ 0x3a72620] Auto-inserting h264_mp4toannexb bitstream filter
 Input #0, concat, from 'concat.txt':
   Duration: N/A, start: 0.000000, bitrate: 3 kb/s
     Stream #0:0: Video: h264 (Baseline), yuv420p(tv), 640x360 [SAR 1:1 DAR
 16:9], 30.30 fps, 30 tbr, 1k tbn, 60 tbc
     Stream #0:1: Audio: speex, 16000 Hz, mono, s16, 3 kb/s
 Output #0, flv, to 'output.flv':
   Metadata:
     encoder         : Lavf57.25.100
     Stream #0:0: Video: h264 ([7][0][0][0] / 0x0007), yuv420p, 640x360
 [SAR 1:1 DAR 16:9], q=2-31, 30.30 fps, 30 tbr, 1k tbn, 1k tbc
     Stream #0:1: Audio: speex ([11][0][0][0] / 0x000B), 16000 Hz, mono, 3
 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
   Stream #0:1 -> #0:1 (copy)
 Press [q] to stop, [?] for help
 concat.txt: Invalid argument
 frame=  150 fps=0.0 q=-1.0 Lsize=     712kB time=00:00:07.37 bitrate=
 791.0kbits/s speed= 186x
 video:702kB audio:4kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.923229%
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5672>
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