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• movenc : Add a flag for indicating a discontinuous fragment

  20 novembre 2014, par Martin Storsjö

  movenc : Add a flag for indicating a discontinuous fragment
  This allows creating a later mp4 fragment without sequentially
  
  writing the earlier ones before (when called from a segmenter).
  Normally when writing a fragmented mp4 file sequentially, the
  
  first timestamps of a fragment are adjusted to match the
  
  end of the previous fragment, to make sure the timestamp is the
  
  same, even if it is calculated as the sum of previous fragment
  
  durations. (And for the first packet in a file, the offset of
  
  the first packet is written using an edit list.)
  When writing an individual mp4 fragment discontinuously like this
  
  (with potentially writing the earlier fragments separately later),
  
  there’s a risk of getting a gap in the timeline if the duration
  
  field of the last packet in the previous fragment doesn’t match up
  
  with the start time of the next fragment.
  Using this requires setting -avoid_negative_ts make_non_negative
  
  (or -avoid_negative_ts 0).
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/movenc.c
  • [DBH] libavformat/movenc.h

• ffmpeg - ffprobe duration format change

  2 juin 2020, par ilham zacky

  I am using ffmpeg to get some file durations 
Below is my code

  



  $filename = '1aef53e6-92ac-4d28-89f8-4cce28fa0f58.mp4'
$duration = if ((ffmpeg -i $filename 2>&1 | Out-String) -match 'Duration:\s+([\d:.]+)') { $matches[1] }


  



  Actual output would be like
H :M :S : F
00:00:00.00

  



  I need the output to be like 
00:00:00:00
Between seconds and frame, there is a " . " full stop, I need it to be a " : "

  



  any suggestions ?

  


• What codec should I use that is easy on the cpu to decode ?

  9 mars 2013, par James491

  I'm looking for a good match between file size and decoding time. I could care less about encoding. Ideally, is there a codec that takes a long time to encode but then is super easy to decode ? I'm currently working with raw video as that is the easiest I've found to decode in libavcodec but that is about 800MB for my 9 second video clip. Quality is very important. I'd prefer a lossless codec. Any suggestions ?