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• FFMPEG - concantenating mp4s from different sources - unable to stop "Non-monotonous DTS in output stream" warning

  7 août 2018, par Sam P

  I need to concatenate mp4 files from different sources, this means some of the variables are out of my control such as timebase, aspect ratio and encoding. So to get around this I re-encode and attempt to standardise the files before concantenating them. Unfortunately, despite this I get Non-monotonous DTS in output stream warnings during the concatenation stage, and the output video seems to always have broken audio/video syncing by the last segment.

  I know there are a lot of other questions out there about resolving the warning above, but I’ve been through them all and reviewed the documentation.. but unfortunately I’ve been still been unable to solve it..

  I think the thing which I don’t understand is : if I have mp4s from different sources, what exactly do I need to do to ensure that the files will always neatly concatenate together ?

  What I’ve tried so far

  The script I’m using to standardise the mp4 files before concantenation is the following (amends resolution, frame rate, timebase, bitrate for audio, bitrate for video, audio encoding and video encoding) :

  ffmpeg -y -i $1 -vf 'scale=1280:720:force_original_aspect_ratio=1,pad=1280:720:(ow-iw)/2:(oh-ih)/2' -r 30 -video_track_timescale 90000 -b:a 128K -b:v 1200K -c:a aac -c:v libx264 $2

  Here’s the ffprobe output on two of the files, there are some differences but I’m not sure if they are significant ?

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'intro.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.12.100
  
    Duration: 00:00:08.98, start: 0.000000, bitrate: 1210 kb/s
  
      Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1069 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 132 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'middle.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.12.100
  
    Duration: 00:00:59.72, start: 0.000000, bitrate: 1200 kb/s
  
      Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1063 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler

  They all have normal video and audio at this point.

  After that I concatenate them and add a watermark using the following (it sucks that I need to re-encode here) :

    ffmpeg -y \
  
      -f concat \
  
      -safe 0 \
  
      -i $INFILES \
  
      -c:v libx264 \
  
      -c:a copy \
  
      -preset fast \
  
      -vf drawtext=enable="'between(t, $DRAW_TEXT_DELAY, $DRAW_TEXT_DURATION)': fontfile=$FONT_DIR/$FONT: text='$TEXT': fontcolor=$FONTCOLOR: fontsize=$FONTSIZE: $POSITION" \
  
      $OUTFILE

  INFILES is a path to a text file formatted like :

  file /usr/src/app/data/test/out/intro.mp4
  
  file /usr/src/app/data/test/out/middle.mp4
  
  file /usr/src/app/data/test/out/outro.mp4

  What am I missing here ? Is there a way to debug this further ?

• ffmpeg : "Impossible to convert between the formats" when using Cuda hardware acceleration

  21 août 2020, par MorenoGentili

  I'm using ffmpeg from the command line on Windows 10 and I wanted to gave Cuda a try to improve execution times. A simple cut command like this works fine and its execution time is reduced by 60-70%. Awesome.

  



  ffmpeg -hwaccel cuvid -c:v h264_cuvid -ss 00:00:10 -i in.mp4 -c:v h264_nvenc out.mp4


  



  Now I tried to use the -filter_complex flag to overlay, fade and translate a png image over a video. The working non-cuda enhanced command is this one :

  



  ffmpeg -i in.mp4 -loop 1 -t 75 -i overlay.png -filter_complex "[1:v]fade=t=in:st=30:d=0.3:alpha=1,fade=t=out:st=35.7:d=0.3:alpha=1[png1];[0:v][png1]overlay=x='if(gte(t,30), (t-30)*10, NAN)'" -movflags +faststart out.mp4


  



  Then, I added the cuda-related flags to the command like this.

  



  ffmpeg -hwaccel cuvid -c:v h264_cuvid -i in.mp4 -loop 1 -t 75 -i overlay.png -filter_complex "[1:v]fade=t=in:st=30:d=0.3:alpha=1,fade=t=out:st=35.7:d=0.3:alpha=1[png1];[0:v][png1]overlay=x='if(gte(t,30), 60-tanh((t-30)*30/5)*60, NAN)'" -movflags +faststart -c:v h264_nvenc out.mp4


  



  But it won't work. I get this error.

  



  Impossible to convert between the formats supported by the filter 'graph 0 input from stream 0:0' and the filter 'auto_scaler_0'
Error reinitializing filters!
Failed to inject frame into filter network: Function not implemented
Error while processing the decoded data for stream #0:0


  



  I don't even know what it means. Can I actually run ANY ffmpeg command on the GPU with Cuda ? I've found some information about the hwupload_cuda flag but I'm not sure if I should use it and how. My attempts have failed so far.
Any advice on how I should modify the command to make it work on the GPU ?
Thanks.

  


• FFMPEG - concatenating mp4s from different sources - unable to stop "Non-monotonous DTS in output stream" warning

  19 novembre 2018, par Sam P

  I need to concatenate mp4 files from different sources, this means some of the variables are out of my control such as timebase, aspect ratio and encoding. So to get around this I re-encode and attempt to standardise the files before concatenating them. Unfortunately, despite this I get Non-monotonous DTS in output stream warnings during the concatenation stage, and the output video seems to always have broken audio/video syncing by the last segment.

  I know there are a lot of other questions out there about resolving the warning above, but I’ve been through them all and reviewed the documentation.. but unfortunately I’ve been still been unable to solve it..

  I think the thing which I don’t understand is : if I have mp4s from different sources, what exactly do I need to do to ensure that the files will always neatly concatenate together ?

  What I’ve tried so far

  The script I’m using to standardise the mp4 files before concantenation is the following (amends resolution, frame rate, timebase, bitrate for audio, bitrate for video, audio encoding and video encoding) :

  ffmpeg -y -i $1 -vf 'scale=1280:720:force_original_aspect_ratio=1,pad=1280:720:(ow-iw)/2:(oh-ih)/2' -r 30 -video_track_timescale 90000 -b:a 128K -b:v 1200K -c:a aac -c:v libx264 $2

  Here’s the ffprobe output on two of the files, there are some differences but I’m not sure if they are significant ?

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'intro.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.12.100
  
    Duration: 00:00:08.98, start: 0.000000, bitrate: 1210 kb/s
  
      Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1069 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 132 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'middle.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.12.100
  
    Duration: 00:00:59.72, start: 0.000000, bitrate: 1200 kb/s
  
      Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1063 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler

  They all have normal video and audio at this point.

  After that I concatenate them and add a watermark using the following (it sucks that I need to re-encode here) :

    ffmpeg -y \
  
      -f concat \
  
      -safe 0 \
  
      -i $INFILES \
  
      -c:v libx264 \
  
      -c:a copy \
  
      -preset fast \
  
      -vf drawtext=enable="'between(t, $DRAW_TEXT_DELAY, $DRAW_TEXT_DURATION)': fontfile=$FONT_DIR/$FONT: text='$TEXT': fontcolor=$FONTCOLOR: fontsize=$FONTSIZE: $POSITION" \
  
      $OUTFILE

  INFILES is a path to a text file formatted like :

  file /usr/src/app/data/test/out/intro.mp4
  
  file /usr/src/app/data/test/out/middle.mp4
  
  file /usr/src/app/data/test/out/outro.mp4

  What am I missing here ? Is there a way to debug this further ?