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• avcodec/mpegvideo : fix edge emulation with uvlinesize below 25

  13 juin 2014, par Michael Niedermayer

  avcodec/mpegvideo : fix edge emulation with uvlinesize below 25
  Fixes fate-vsynth3-wmv2
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/mpegvideo.c
  • [DH] libavcodec/mpegvideo_motion.c

• Concat same video multiple times failed

  23 juin 2019, par S.T

  i am trying to concatenate the same video multiple times and it fails.

  This is the command i used :
  ffmpeg -i 1.mp4 -i 1.mp4 -i 1.mp4 -filter_complex [0:v:0][0:a:0][1:v:0][1:a:0][2:v:0][2:a:0]concat=n=3:v=1:a=1[concatv][concata] -map [concatv] -map [concata] output.mp4

  The command fails and the error i am getting is :

  Stream specifier ’:a:0’ in filtergraph description [0:v:0][0:a:0][1:v:0][1:a:0][2:v:0][2:a:0]concat=n=3:v=1:a=1[concatv][concata] matches no streams.

  i expect that i will get the same video 3 times, one after one.
  Can someone help ?

• Rewrite video with ffmpeg with given non-equidistant times for each frame

  27 mars, par Aleph0

  In one of my projects it is necessary to synchronize a video with a different datasource. I already have the video as a mts file.

  


  I also exactly know which frame will be displayed at which time. This times are not necessarily equidistant.

  


  For simplicity assume that my video consists just out of 5 frames :

  


  




  


  


  


  


  



  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  Frame No	Time
  1	1s
  2	3s
  3	5s
  4	8s
  5	12s

  


  What kind of ffmpeg command using a list of times give by a simple text file can be used to create a video stream with non-equidistant frames with the given times.