[FFmpeg-trac] #3942(undetermined:open): misbehaviour of ``afade`` chained with ``amovie``

FFmpeg trac at avcodec.org
Fri Sep 12 01:28:27 CEST 2014


#3942: misbehaviour of ``afade`` chained with ``amovie``
-------------------------------------+-------------------------------------
             Reporter:  while0pass   |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  amovie       |               Resolution:
  afade                              |               Blocked By:
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * status:  new => open
 * version:  unspecified => git-master
 * reproduced:  0 => 1


Comment:

 Not a regression afaict.

 {{{
 $ ffmpeg -i fate-suite/svq3/Vertical400kbit.sorenson3.mov out.mp2
 }}}
 {{{
 $ ffmpeg -filter_complex "amovie=out.mp2, atrim=start=0:end=10,
 afade=t=in:st=0:d=2, afade=t=out:st=8:d=2" out.wav
 ffmpeg version N-66242-g453944c Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Sep 12 2014 00:49:57 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      54.  7.100 / 54.  7.100
   libavcodec     56.  1.100 / 56.  1.100
   libavformat    56.  4.101 / 56.  4.101
   libavdevice    56.  0.100 / 56.  0.100
   libavfilter     5.  1.100 /  5.  1.100
   libswscale      3.  0.100 /  3.  0.100
   libswresample   1.  1.100 /  1.  1.100
   libpostproc    53.  0.100 / 53.  0.100
 [mp3 @ 0x33cfea0] Estimating duration from bitrate, this may be inaccurate
 Output #0, wav, to 'out.wav':
   Metadata:
     ISFT            : Lavf56.4.101
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono,
 s16, 705 kb/s (default)
     Metadata:
       encoder         : Lavc56.1.100 pcm_s16le
 Stream mapping:
   afade -> Stream #0:0 (pcm_s16le)
 Press [q] to stop, [?] for help
 size=     861kB time=00:00:10.00 bitrate= 705.7kbits/s
 video:0kB audio:861kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.008844%
 }}}
 The output file is not silent if the intermediate file is a wav file or
 the original mov.

 If ac3 is used as intermediate format, the effect is even worse: The
 output file starts loud and gets silent after two seconds.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3942#comment:1>
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