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• ffmpeg - seamless crossfade loop for the part of video

  14 janvier 2021, par Flamin GO

  I need to apply crossfade to the last X frames of a video with the first X frames in order to obtain a seamless loop, but making this for the necessary part of video.

  


  Here's the answer for looping the entire video.

  


  Currently what I have :
(Whole video duration = 25. Cutted (result) part = 15 sec (from 5 to 20 sec pos). Transition = 1 sec.)

  


  ffmpeg -i input.mp4 -ss 5 -to 20 -filter_complex
    "[0]split[body][pre];
     [pre]trim=duration=1,format=yuva420p,fade=d=1:alpha=1,setpts=PTS+( (15+(5-1)) /TB)[jt];
     [body]trim=1,setpts=PTS-STARTPTS[main];
     [main][jt]overlay"  -c:v libx264 -preset veryslow -b:v 2500K output.mp4
 


  


  In this case, everything works, but at the end of the resulting video, a piece from the original video is superimposed, which starts from 0 to 1 second, and not from 4 to 5 seconds of the original video, as it should be.

  


  I read the official ffmpeg documentation, tried some actions on "start/end" parameters for "trim/fade" with changing of "setpts", but I always got just another batch of bugs.

  


• avcodec/h261dec : Don't initialize unused part of RLTable

  9 décembre 2020, par Andreas Rheinhardt

  avcodec/h261dec : Don't initialize unused part of RLTable
  The H.261 decoder only uses an RLTable's VLC table, yet it also
  
  initializes its index_run, max_level and max_run. This commit stops
  
  doing so ; it will also simplify making this decoder init-threadsafe,
  
  as the H.261 decoder and encoder now initialize disjoint parts of their
  
  common RLTable.
  Reviewed-by : Anton Khirnov <anton@khirnov.net>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavcodec/h261dec.c

• flutter_ffmpeg - Can we trim a part of the video in flutter while recording

  16 février 2021, par Mayur Agarwal

  I am making a flutter app, in which a user can record a video and pause in between, and when the user pauses the video a clip is formed.
So if the 4 clips are there, then 4th clip can be removed from the video (according to the time of the last clip).
By a clip I just mean the time interval between two continuous pauses. The video is being recorded continuously.
There's a way to trim a video after it's being record, for example,

  


   ffmpeg -ss 00:01:00 -i input.mp4 -to 00:02:00 -c copy output.mp4


  


  But I think it's possible only when the video is recorded.

  


  So, Is there any way to to trim a video (using flutter_ffmpeg) or the last clip, while the recording is paused ?