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• ffmpeg : prevent premature EOF in sub2video with nullptr AVSubtitles

  31 mars 2018, par Jan Ekström

  ffmpeg : prevent premature EOF in sub2video with nullptr AVSubtitles
  With certain types of input and the filter chain getting re-initialized
  
  or re-configured, multiple nullptr AVSubtitles can get pushed into
  
  sub2video_update() in a row from sub2video_heartbeat.
  This causes end_pts, and on the next round pts, to become INT64_MAX,
  
  latter of which signals EOF in framesync, leading to complete loss of
  
  subtitles from that point on.
  Thus, check that the sub2video.end_pts is smaller than INT64_MAX
  
  in a similar fashion to sub2video_flush before sending out the
  
  nullptr AVSubtitle. This keeps premature EOFs from happening in
  
  framesync and the subtitle overlay is kept past the filter chain
  
  re-initializations/configurations.
  

  • [DH] fftools/ffmpeg.c

• libx264 : Define X264_API_IMPORTS on MSVC/ICL

  19 juillet 2013, par Derek Buitenhuis

  libx264 : Define X264_API_IMPORTS on MSVC/ICL
  libx264 has a few data exports which require X264_API_IMPORTS
  
  to be defined if we link to libx264 dynamically on Windows.
  In a similar fashion to how we handle our compat snprintf
  
  implementation, if we define it all the time, the compiler
  
  will first try and link to __imp_x264_symbol_name, and failing
  
  that, as in the case of a static libx264, will attempt to link
  
  to the non-prefixed symbol, which has already been pulled in by
  
  other x264 functions’ object files.
  Signed-off-by : Derek Buitenhuis <derek.buitenhuis@gmail.com>
  

  • [DBH] libavcodec/libx264.c

• ffmpeg glue 4 videos on split screen with preview

  18 janvier 2023, par rst630

  I have 4 video files 480x1080 with audio - all different duration.

  


  I need 1920x1080 video

  


  _____________________________________________
|          |          |          |          |
|          |   first  |  first   |  first   |
|   play   |   frame  |  frame   |  frame   |
|          |          |          |          |
---------------------------------------------

_____________________________________________
|          |          |          |          |
|          |   play   |  first   |  first   |
|   last|  |          |  frame   |  frame   |
|   frame  |          |          |          |
---------------------------------------------


  


  when first video done 2nd column video must start and first video must show just last frame, other left 2 videos still show first frame and wait queue

  


  for example lets say we have these durations :

  


  1.mp4 - 1:00
2.mp4 - 1:35
3.mp4 - 1:20
4.mp4 - 1:05


  


  Also I can prepare screenshots of each video for preview frames (first/last)

  


  Cant even imagine how to do this job with ffmpeg or maybe exists any simplier way for shell ?

  


  example of output video https://www.youtube.com/watch?v=vdBd5-8uOTo