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• avfilter's anull says "Rematrix is needed between stereo and 0 channels but there is not enough information to do it"

  24 mai 2017, par kuanyui

  I’m trying to write a transcoder according to FFMpeg’s official example with ffmpeg 3.2.4 (official prebuild Win32), and try to transcode a video with stereo audio stream source (from avformat’s dshow).

  In the example code, which passes anull into avfilter_graph_parse_ptr() for audio stream, and "time_base=1/44100:sample_rate=44100:sample_fmt=s16:channels=2:channel_layout=0x3" is passed into avfilter_graph_create_filter(), occurs error in the following avfilter_graph_config() :

  [auto-inserted scaler 0 @ 32f77600] w:iw h:ih flags:'bilinear' interl:0
  
  [Parsed_null_0 @ 2e9d79a0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'in' and the filter 'Parsed_null_0'
  
  [swscaler @ 3331bfe0] deprecated pixel format used, make sure you did set range correctly
  
  [auto-inserted scaler 0 @ 32f77600] w:1920 h:1080 fmt:yuvj422p sar:1/1 -> w:1920 h:1080 fmt:yuv420p sar:1/1 flags:0x2
  
  [libmp3lame @ 2e90a360] Channel layout not specified
  
  [in @ 3866e8a0] tb:1/44100 samplefmt:s16 samplerate:44100 chlayout:0x3
  
  [Parsed_anull_0 @ 330e8820] auto-inserting filter 'auto-inserted resampler 0' between the filter 'in' and the filter 'Parsed_anull_0'
  
  [auto-inserted resampler 0 @ 330e8dc0] [SWR @ 3809b620] Rematrix is needed between stereo and 0 channels but there is not enough information to do it
  
  [auto-inserted resampler 0 @ 330e8dc0] Failed to configure output pad on auto-inserted resampler 0

  I’ve googled for days but didn’t find any clue for it. Doesn’t what anull do is only "Pass the audio source unchanged to the output", why libav want to resample stereo to 0 channel ? What’s going wrong ?

• avcodec/dvdsubdec : Fix runtime error : left shift of 242 by 24 places cannot be repres...

  5 mai 2017, par Michael Niedermayer

  avcodec/dvdsubdec : Fix runtime error : left shift of 242 by 24 places cannot be represented in type 'int'
  Fixes : 1080/clusterfuzz-testcase-5353236754071552
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/dvdsubdec.c

• ffmpeg producing empty MP4 files

  3 mai 2017, par Joshua Dowell

  I am trying to use ffmpeg to convert MTS files to MP4 files. It seems as though the command is running correctly, but the resulting files end up being empty.

  joshua@joshua-VirtualBox:~$ ffmpeg -i /media/sf_2017-04/SD_044/00007.MTS /media/sf_2017-04/SD_04/000007.mp4
  
  ffmpeg version 0.8.17-4:0.8.17-0ubuntu0.12.04.2, Copyright (c) 2000-2014 the Libav developers
  
    built on Apr  1 2016 14:28:02 with gcc 4.6.3
  
  The ffmpeg program is only provided for script compatibility and will be removed
  
  in a future release. It has been deprecated in the Libav project to allow for
  
  incompatible command line syntax improvements in its replacement called avconv
  
  (see Changelog for details). Please use avconv instead.
  
  Input #0, mpegts, from '/media/sf_2017-04/SD_044/00007.MTS':
  
    Duration: 00:01:17.07, start: 1.927822, bitrate: 25053 kb/s
  
    Program 1 
  
      Stream #0.0[0x1011]: Video: h264 (High), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 59.96 fps, 59.94 tbr, 90k tbn, 119.88 tbc
  
      Stream #0.1[0x1100]: Audio: ac3, 48000 Hz, stereo, s16, 256 kb/s
  
      Stream #0.2[0x1200]: Data: [144][0][0][0] / 0x0090
  
  File '/media/sf_2017-04/SD_04/000007.mp4' already exists. Overwrite ? [y/N] y
  
  [buffer @ 0x88772a0] w:1920 h:1080 pixfmt:yuv420p
  
  ffmpeg -i /media/sf_2017-04/SD_044/00007.MTS /media/sf_2017-04/SD_04/000007.mp4
  
  ffmpeg version 0.8.17-4:0.8.17-0ubuntu0.12.04.2, Copyright (c) 2000-2014 the Libav developers
  
    built on Apr  1 2016 14:28:02 with gcc 4.6.3
  
  The ffmpeg program is only provided for script compatibility and will be removed
  
  in a future release. It has been deprecated in the Libav project to allow for
  
  incompatible command line syntax improvements in its replacement called avconv
  
  (see Changelog for details). Please use avconv instead.
  
  Input #0, mpegts, from '/media/sf_2017-04/SD_044/00007.MTS':
  
    Duration: 00:01:17.07, start: 1.927822, bitrate: 25053 kb/s
  
    Program 1 
  
      Stream #0.0[0x1011]: Video: h264 (High), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 59.96 fps, 59.94 tbr, 90k tbn, 119.88 tbc
  
      Stream #0.1[0x1100]: Audio: ac3, 48000 Hz, stereo, s16, 256 kb/s
  
      Stream #0.2[0x1200]: Data: [144][0][0][0] / 0x0090
  
  File '/media/sf_2017-04/SD_04/000007.mp4' already exists. Overwrite ? [y/N] y
  
  [buffer @ 0x88772a0] w:1920 h:1080 pixfmt:yuv420p
  
  encoder 'aac' is experimental and might produce bad results.
  
  Add '-strict experimental' if you want to use it.