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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 ?

• avfilter/graphparser : allow specifying filter@id as filter instance

  17 mai 2017, par Muhammad Faiz

  avfilter/graphparser : allow specifying filter@id as filter instance
  See http://lists.ffmpeg.org/pipermail/ffmpeg-user/2017-April/035975.html
  
  Parsed_filter_X could remain and user can override it with custom one.
  Example :
  
  ffplay -f lavfi "nullsrc=s=640x360,
  
  sendcmd='1 drawtext@top reinit text=Hello ; 2 drawtext@bottom reinit text=World',
  
  drawtext@top=x=16:y=16:fontsize=20:fontcolor=Red:text='',
  
  drawtext@bottom=x=16:y=340:fontsize=16:fontcolor=Blue:text=''"
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Muhammad Faiz <mfcc64@gmail.com>
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/graphparser.c

• FFMPEG - Using multiple Fiters including hardsub, denoise, watermark causes "Too many inputs" Error

  17 avril 2017, par Vahid Jamali

  I’m trying to do one command with complex filters that allow for denoising, hardsub, scaling (to 480 height) and watermark.

  I’ve gotten 3/4 filters to work in combination with each other here :

   ffmpeg -i test720.mp4 -vf hqdn3d=1.5:1.5:6:6,scale=w="if(gt(dar\,854/480)\,min(854\,iw*sar)\,2*trunc(iw*sar*oh/ih/2))":h="if(gt(dar\,854/480)\,2*trunc(ih*ow/iw/sar/2)\,min(480\,ih))"\:flags=bicubic,setsar=1\,subtitles=add.ass[out]" -c:v libx264 -crf 18 -preset veryslow -tune film -refs 8 -bf 6 -aq-mode 2  -c:a copy -f mp4 720encoded.mp4

  but when it comes to all for, it gives me a Too many inputs specified for the "movie" filter.

  Here is my command that should work but doesn’t :

   ffmpeg -i test720.mp4 -vf hqdn3d=1.5:1.5:6:6,scale=w="if(gt(dar\,854/480)\,min(854\,iw*sar)\,2*trunc(iw*sar*oh/ih/2))":h="if(gt(dar\,854/480)\,2*trunc(ih*ow/iw/sar/2)\,min(480\,ih))"\:flags=bicubic,setsar=1\,"movie=actorimage.png[wm];[in][wm]overlay=30:main_h-overlay_h-120\,subtitles=add.ass[out]" -c:v libx264 -crf 18 -preset veryslow -tune film -refs 8 -bf 6 -aq-mode 2  -c:a copy -f mp4 720encoded.mp4

  I’m sure I’m making a simply syntax error somewhere in there.