[FFmpeg-trac] #1491(FFmpeg:new): "-t" and "-filter_complex" are incompatible

[FFmpeg]

#1491: "-t" and "-filter_complex" are incompatible
----------------------------------+--------------------------------------
             Reporter:  nichot20  |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  FFmpeg    |                  Version:  git-master
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
----------------------------------+--------------------------------------
 Summary of the bug:

 If using a commandline containing "-filter_complex" on a large file,
 attempting to use -t to limit the length of the output file (say in order
 to test the command line) results in the required number of frames being
 processed, and then the buffers continuing to fill up until either all
 frames have been read, or memory runs out.

 In the first case the resultant file is OK (in my tests), but time is
 wasted as the process reads to the end of the file, in the second case the
 process is terminated without the file being written fully, making it
 unusable (in my tests).

 How to reproduce:
 {{{
 % ffmpeg -i LTA01631701.mxf -filter_complex "
 > [0:1] [0:2] amerge [audio]" \
 > -map 0:0 -map '[audio]' \
 > -c:v dvvideo -pix_fmt yuv420p \
 > -c:a pcm_s16le -ar 48k -ac 2 \
 > -t 10 -y ./LTA01631701-duff.mov
 ffmpeg version N-41976-g734aeeb-by_Tim Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Jun 27 2012 08:52:54 with gcc 4.6.2
   configuration: --extra-version=by_Tim --enable-static --disable-shared
 --enable-gpl --enable-nonfree --enable-version3 --prefix=/mnt/msds-
 store-0/tim/ffmpeg-tux/usr/local --libdir=/mnt/msds-store-0/tim/ffmpeg-
 tux/usr/local/lib64 --samples=../fate-suite/ --enable-runtime-cpudetect
 --extra-cflags='-static -I/mnt/msds-store-0/tim/ffmpeg-
 tux/usr/local/include' --extra-ldflags='-static -L/mnt/msds-store-0/tim
 /ffmpeg-tux/usr/local/lib64' --progs-suffix=_Jun-27 --enable-libfaac
 --enable-libx264 --enable-libfreetype --disable-ffplay --disable-ffserver
   libavutil      51. 63.100 / 51. 63.100
   libavcodec     54. 29.101 / 54. 29.101
   libavformat    54. 11.100 / 54. 11.100
   libavdevice    54.  0.100 / 54.  0.100
   libavfilter     3.  0.100 /  3.  0.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0. 15.100 /  0. 15.100
   libpostproc    52.  0.100 / 52.  0.100
 [mxf @ 0x180c960] could not resolve material track sequence strong ref
 Guessed Channel Layout for  Input Stream #0.1 : mono
 Guessed Channel Layout for  Input Stream #0.2 : mono
 Guessed Channel Layout for  Input Stream #0.3 : mono
 Guessed Channel Layout for  Input Stream #0.4 : mono
 Input #0, mxf, from 'LTA01631701.mxf':
   Metadata:
     timecode        : 00:00:00:00
   Duration: 00:17:44.44, start: 0.000000, bitrate: 170532 kb/s
     Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 720x576, 25
 fps, 25 tbr, 25 tbn, 25 tbc
     Stream #0:1: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
     Stream #0:2: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
     Stream #0:3: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
     Stream #0:4: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
 [graph 0 input from stream 0:1 @ 0x183cac0] tb:1/25 samplefmt:s32
 samplerate:48000 chlayout:0x4
 [graph 0 input from stream 0:2 @ 0x183cb20] tb:1/25 samplefmt:s32
 samplerate:48000 chlayout:0x4
 [Parsed_amerge_0 @ 0x1812cc0] Inputs overlap: output layout will be
 meaningless
 [Parsed_amerge_0 @ 0x1812cc0] in0:mono + in1:mono -> out:stereo
 [auto-inserted resampler 0 @ 0x182cf60] chl:stereo fmt:s32 r:48000Hz ->
 chl:stereo fmt:s16 r:48000Hz
 [graph 1 input from stream 0:0 @ 0x182c420] w:720 h:576 pixfmt:uyvy422
 tb:1/25 fr:25/1 sar:0/1 sws_param:flags=2
 [output stream 0:0 @ 0x182cec0] No opaque field provided
 [auto-inserted scaler 0 @ 0x182c540] w:720 h:576 fmt:uyvy422 sar:0/1 ->
 w:720 h:576 fmt:yuv420p sar:0/1 flags:0x4
 Output #0, mov, to './LTA01631701-duff.mov':
   Metadata:
     timecode        : 00:00:00:00
     encoder         : Lavf54.11.100
     Stream #0:0: Video: dvvideo (dvcp / 0x70637664), yuv420p, 720x576,
 q=2-31, 200 kb/s, 25 tbn, 25 tbc
     Stream #0:1: Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo,
 s16, 1536 kb/s
 Stream mapping:
   Stream #0:1 (pcm_s24le) -> amerge: (graph 0)
   Stream #0:2 (pcm_s24le) -> amerge::sample_fmt=s32:channel_layout=0x4
 (graph 0)
   Stream #0:0 -> #0:0 (rawvideo -> dvvideo)
   amerge (graph 0) -> Stream #0:1 (pcm_s16le)
 Press [q] to stop, [?] for help
 frame=  250 fps= 28 q=0.0 Lsize=   37035kB time=00:00:10.00
 bitrate=30339.1kbits/s
 8424 Killed                  ffmpeg -i.......
 }}}

 The input file need to be larger than available memory to see the process
 being killed.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1491>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker