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• Old TV : ffmpeg-converted file not working

  29 décembre 2016, par senseiwa

  I have an old Full-HD TV (Philips) that supports USB reading with some video formats. However, it just supports one audio stream (the first), so in case I have two with the first that is not english, I need to remove the first one. I am doing this via ffmpeg, but the TV cannot read the converted file, although they are identical (except for one audio track).

  The conversion command I am using is is

   ffmpeg -i filename.IN -map 0:0 -map 0:2 -acodec copy -vcodec copy  filename.OUT

  to just copy the video/audio stream, but keeping only the second audio track. The original file is this one (output of ffprobe) and it works perfectly reproducing the video with the first audio track :

  Input #0, avi, from 'ORIG.avi':
  
    Metadata:
  
      encoder         : X
  
    Duration: 01:40:57.18, start: 0.000000, bitrate: 2695 kb/s
  
      Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 656x368 [SAR 1:1 DAR 41:23], 1914 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 23.98 tbc
  
      Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1(side), fltp, 384 kb/s
  
      Stream #0:2: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1(side), fltp, 384 kb/s

  and the converted not working one is

  Input #0, avi, from 'CONV.avi':
  
    Metadata:
  
      encoder         : Lavf57.56.100
  
    Duration: 01:40:57.18, start: 0.000000, bitrate: 2309 kb/s
  
      Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 656x368 [SAR 1:1 DAR 41:23], 1914 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 23.98 tbc
  
      Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1(side), fltp, 384 kb/s

  On a PC, however, they both work.

  The question is, how can I convert, keeping eventually just one audio track, in a format that my TV supports without losing quality ?

  I do not have the list of supported codecs, but I have a list of videos that the TV is able to reproduce.

• FFMpeg : how to blur two fixed regions at the bottom of the video file ?

  24 décembre 2022, par bully44

  I'm trying to blur to rectangular regions at the bottom of the video. Only short region around center should stay as it is, and 140 pixels regions on both sides should be blurred.
The left region is ok, but just cannot set correctly the right one. For visual reason, I'm displaying it higher, but I just cannot get x coordinate and size in correct position.

  


  ffmpeg -i Test1.mp4 -filter_complex  \
"[0:v]crop=iw/2-40:140:0:ih-140,avgblur=10[b0]; \
 [0:v]crop=iw/2-50:140:iw/2+200:ih-140,avgblur=5[b1]; \
 [0:v][b0]overlay=0:H-h[ovr0]; \
 [ovr0][b1]overlay=W/2+100:H-h-500" \
 -c:a copy -movflags +faststart Test_blur.mp4


  


  As FFMpeg newbie, I must be doing something obviously wrong.
Thanks in advance,
regards.

  


• ffmpeg converting mov to mp4

  16 mai 2019, par alienbuild

  Trying to convert .mov to .mp4. Tried various suggestion codes on stackoverflow but nothing seems to be working.

  `...muxer does not support non seekable output [48] => Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument [49] => Error initializing output stream 0:0 -- [50] => Conversion failed! ) 1`

  I’ve tried various codec properties such as ac3, aac, libvo_aacenc

  exec('
  
  /usr/local/bin/ffmpeg -y -i https://***.***.com/assets/regions/region-1/input.mov' . 
  
  ' -c:a ac3 ' 
  
  . 'https://***.***.com/assets/regions/region-1/output.mp4' 
  
  . ' 2>&1', $out, $res);
  
  
  
  $modx->log(modX::LOG_LEVEL_ERROR, print_r($out));
  
  $modx->log(modX::LOG_LEVEL_ERROR, $res);
  
  
  
  return true;