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• Revert "avcodec/mediacodecdec : wait on first frame after input buffers are full"

  18 juin 2018, par Aman Gupta

  Revert "avcodec/mediacodecdec : wait on first frame after input buffers are full"
  @xyz reported a regression on his Sony Xperia Z3 Tablet Compact where
  
  playback would intermittently fail to start, essentially deadlocking in
  
  the decoder. Bisecting narrowed down the issue to this commit, which was
  
  meant as an optimization but is not necessary.
  This reverts commit a75bb5496ac6e7e194f1c6fd3b87f02a52e74adb.
  Signed-off-by : Aman Gupta <aman@tmm1.net>
  

  • [DH] libavcodec/mediacodecdec_common.c
  • [DH] libavcodec/mediacodecdec_common.h

• set variable and call result during FOR loop ; batch script windows

  19 juin 2018, par Doons

  I have read several posts here on Stackoverflow about binding a variable during a FOR loop. While I figure most of the help provided here has been for Linux/Unix, I’m reaching out for help with batch scripting in Windows. My main goal is to extract the "date created" from a mp4-file and "overlay the date on my video" using ffmpeg (and or ffprobe).

  I have experimented a lot, but my latest attempt has been trying to bind the result from ffprobe onto a variable, and use the variable later. My latest and simplest attempt looks like this :

  SETLOCAL ENABLEDELAYEDEXPANSION
  
  for %%a in ("*.mp4") do (
  
  for /F "tokens=*" %%G in ('ffprobe -v quiet %%a -print_format compact -show_entries format_tags=creation_time') do (
  
  set DateC=%%G
  
  echo !DateC!)
  
  )

  I was hoping to be able to print the tag result from ffprobe using that code, but apparently not. So helping me bind that variable, and how to call it again later inside the following code snippet in Windows, would be deeply appreciated :

   ffmpeg -i %%a -filter_complex "drawtext=fontfile=/Windows/Fonts/Arial.ttf:x=28:y=650:fontsize=45:fontcolor=white:box=1:boxcolor=black@0.4:text='!DateC!'" -c:a copy output.mp4

  I must also mention I’ve seen the following code on StackOverflow :

   ffmpeg -i %%a -filter_complex "drawtext=fontfile=/Windows/Fonts/Arial.ttf:x=28:y=650:fontsize=45:fontcolor=white:box=1:boxcolor=black@0.4:text='%{metadata\:creation_time}'" -c:a copy output.mp4

  But I have the same problem making Windows recognize and print the metadata.

  I am certain the file in question contains this metadata.

• Displaying javacv Frame class

  3 avril 2018, par shubham jaiswal

  I want to display a javacv Frame object directly into a gui container without converting into a buffered image or any of the jpeg/bmp as mentioned in https://docs.oracle.com/javase/8/javafx/api/javafx/scene/image/Image.html. Is there any way in which it can be achieved ?

  I want to do this as I have multiple video streams to be displayed.Currently the best performance that could be achieved is using JFrame and pixelwriter.It consumes around 8% CPU. I want to bring it to below 4% and so need a method to display the Frame object directly.

  If anyone could suggest an alternative GUI or language, it still helps.

  Regards & Thanks.