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• ffmpeg setpts apply uniform offset

  19 novembre 2018, par Vinay

  I have a series of videos that I’m converting from .mov to .ts and then create an HLS playlist for. I’m able to figure out the ending pts for both the audio and video streams of any given video and am trying apply that ending (cumulative) offset when converting later videos in the sequence. For instance :

  1. convert 0.mov -> 0.ts
  2. Get ending pts of audio stream and video stream for 0.ts.
  3. Apply ending video/audio stream as a setpts filter for converting 1.mov -> 1.ts
  4. Repeat

  As an example, I’m using the following command for the second video in the sequence :

  ffmpeg -y -i 1.mov \
  
      -filter:a "asetpts=PTS-STARTPTS+367534" \
  
      -filter:v "setpts=PTS-STARTPTS+363000" \
  
      -codec:v libx264 -crf 18 -preset veryfast \
  
      -acodec aac -muxdelay 0 1.ts

  The offset pts 367534 (audio) and 363000 were grabbed from 0.ts converted before, however, when I do this, 1.ts ends up having a duration of 58s and an offset of 8.31s.

  This is how I’m grabbing the ending pts offset of 0.ts (inspired by https://stackoverflow.com/a/53348545/696130) :

  ffprobe -v 0 \
  
      -show_entries packet=pts,duration -of compact=p=0:nk=1 \
  
      -select_streams a \
  
      0.ts | | sed \'/^\s*$/d\' | tail -1

• ffprobe get pts of last audio/video packet

  17 novembre 2018, par Vinay

  I have an mov file that I need to get the ending pts for both the audio and video streams. I’m able to do this by doing the following (manually) :

  ffprobe -show_packets file.mov

  Which gives me an output like (with many more packets of course) :

  [PACKET]
  
  codec_type=audio
  
  stream_index=0
  
  pts=221184
  
  pts_time=5.015510
  
  dts=221184
  
  dts_time=5.015510
  
  duration=580
  
  duration_time=0.013152
  
  convergence_duration=N/A
  
  convergence_duration_time=N/A
  
  size=304
  
  pos=4833575
  
  flags=K_
  
  [/PACKET]
  
  [PACKET]
  
  codec_type=video
  
  stream_index=1
  
  pts=29800
  
  pts_time=4.966667
  
  dts=29400
  
  dts_time=4.900000
  
  duration=200
  
  duration_time=0.033333
  
  convergence_duration=N/A
  
  convergence_duration_time=N/A
  
  size=20707
  
  pos=4837376
  
  flags=__
  
  [/PACKET]

  In the scenario above, the ending pts is 221764 for audio and 30000 for video (pts + duration).

  I was wondering if there was an easy way to either get the final audio/video packet pts directly via ffprobe flags or by intelligently parsing the output.

• Segment Broadcast WAVE file with FFMPEG

  4 octobre 2018, par yekootmada

  I have a Broadcast WAV file that is duration 4 hours with a timecode track starting at 00:00:00 and ending at 04:00:00 (obviously).

  I need to extract a section of the file, for example from 01:45:00 to 03:55:00 whilst maintaining the original timecode data for that section of the file.

  When i run this FFMPEG script, I get the correction section of the file in "out.wav", however the start timecode of the file is always 00:00:00, and not 01:45:00 as you would expect.

  Here is my current code :

  ffmpeg -ss 01:45:00 -i in.wav -to 03:55:00 -c copy -write_bext 1 out.wav

  How do you tell ffmpeg to take the timecode data from the section of the file and not copy it from the beginning ?

  Thanks a lot, hope that is clear.