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• avformat/avisynth : remove atexit() handler

  7 juillet 2024, par Stephen Hutchinson

  avformat/avisynth : remove atexit() handler
  The atexit() handler in the avisynth demuxer was added because
  
  there was a conflict in AvxSynth that arose due to their use
  
  of C++ global objects, particularly in relation to having
  
  added a logging function relying on log4cpp.
  This conflict was responsible for causing a segfault on exit.
  
  It did not affect Windows with the (at the time) upstream
  
  AviSynth 2.5 and 2.6, nor does it affect AviSynth+.
  Unfortunately, none of this was actually shielded by ifdefs
  
  indicating the fact it was only needed for AvxSynth, so four
  
  years ago when AviSynth+ replaced AvxSynth as the handler
  
  for AviSynth scripts on Unix-like OSes, the fact that the
  
  atexit handler was no longer necessary was overlooked.
  Signed-off-by : Stephen Hutchinson <qyot27@gmail.com>
  

  • [DH] libavformat/avisynth.c

• *Desperately* Trying to create a cmd batch script (.bat) to break up and convert many mp4 videos using ffmpeg

  8 septembre 2015, par bobafetta

  I have a ton of videos I need to convert from mp4 to wmv using ffmpeg and break up each file into 10 minute segments, but I am a total cmd scripting newb (in fact, I am a scripting newb :)

  After spending six hours trying to find an answer, I thought I would bring it to you guys.

  The code I have is working a little bit, but I need to be able to read data coming from the command line and send it back into the script for evaluation. I am not sure what code ffmpeg will spit out when it is done processing a video file (when the timestamp reaches an end), but this FOR loop just keeps on trying to create new file segments even though the video is over. This is what I saw when it tried to create a new file, so I think it might work to search for this :

  frame= 0 fps=0.0 q=0.0 Lsize= 1kB time=00:00:00.00 bitrate=N/A

  This is the code I have come up with so far (Don’t laugh :)

  @echo off
  
  setlocal ENABLEEXTENSIONS
  
  setlocal ENABLEDELAYEDEXPANSION
  
  
  
  for %%a in ("*.mp4") do (
  
  set hour=00
  
  
  
  for /L %%i IN (1,1,10) do (
  
  :Beginning
  
      set /a start=%%i-1
  
          set end=%%i
  
          if !start! lss 10 set start=!start!0
  
          if !end! lss 10 set end=!end!0
  
          ffmpeg -ss !hour!:!start!:00 -i "%%a" -b:v 1500k -vcodec msmpeg4 -acodec wmav2 -t !hour!:!end!:00 "Converted\%%~na-!hour!-!start!-!end!.wmv"
  
          if end==60 CALL :Increment
  
      )   
  
  )
  
  
  
  :Increment
  
      set /a !hour!+1
  
      set %%i=1
  
      GOTO :Beginning
  
  pause

  Based on reading this thread was thinking something like this might go in the code, but not sure what to do with it :

  set "dosstring=%*"
  
  
  
  echo.!dosstring!|findstr /C:"frame=    0 fps=0.0 q=0.0 Lsize=       1kB time=00:00:00.00 bitrate=N/A" >nul 2>&1

  Thanks so much for you help !

• lavfi/libplacebo : properly handle EOF

  21 mai 2023, par Niklas Haas

  lavfi/libplacebo : properly handle EOF
  The current code relied on pl_queue eventually returning EOF back to the
  
  caller, which didn't work in all situations (e.g. single frame input).
  
  Also, the current code assumed that ff_inlink_acknowledge_status only
  
  fired once, which was patently not true, as the above edge cases
  
  demonstrated.
  Solve both issues by keeping track of the acknowledged link status and
  
  forwarding it (instead of trying to probe the pl_queue again) in the
  
  event that we run out of queued input frames, as well as (in CFR mode)
  
  when we pass the indicated status PTS.
  

  • [DH] libavfilter/vf_libplacebo.c