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• Revision 235b77e54b : decode_test_driver : Use size_t for size arg to DecodeFrame(). Use size_t for De

  13 février 2014, par Tom Finegan

  Changed Paths :
   Modify /test/decode_test_driver.cc

  
   Modify /test/decode_test_driver.h

  
  
  decode_test_driver : Use size_t for size arg to DecodeFrame().

  Use size_t for DecodeFrame()'s size arg, and cast only
  at the vpx_codec_decode() call site. This silences warnings that
  appear in svc_test.cc when building with vs2013.

  Change-Id : I2cf39f02a45732c752097f07b0c7ad414b1517d8

• I am able to write certain metadata information to a .m4v file but not all using ffmpeg

  14 janvier 2014, par user3193123

  For example use this code

  ffmpeg -i avatar.m4v -metadata title="Avatar" -metadata artist="James Cameron" -metadata     description="Long Long Ago…" acodec copy -vcodec copy -y /Users/Anand/Desktop/anand.m4v

  Works perfectly fine !!!

  But i am not able to write metadata information such as Rating, Actors(Cast), Producers etc.. because i dont know the keywords or the keywords don't exist ?

  Any body know the keyword for them or can't i write them ?

• ffmpeg : concat videos and images

  23 mai 2016, par Yosko

  I have 2 videos (same resolution, same encoding) files that I want to concat and I want to insert some text for 3 seconds between them, as a splitter. I’m doing this with ffmpeg on Windows.

  Optional ideas that I would be interested in :

  • avoid reencoding the video in the process
  • having a fade in / fade out at the intersection of each part

  For now, I made the text as an image (but I am open to other suggestions). Let’s say I have :

  • video1.mp4 : 6:33
  • splitter.png (same resolution as video1.mp4)
  • video2.mp4 : 16:44

  I have tried a few things, but I always end up with the same problem : the video is 23:20 (video1 + 3 seconds + video2), but the 3 seconds gap is just the last video1 frame frozen instead of my image/text...

  Any Idea what I did wrong or how I should achieve this ?

  Here is what I tried so far :

  Method 1 : image to video

  Turn the image into a 3 seconds mp4 film, then concat (demuxer) it with the others :

  ffmpeg -loop 1 -f image2 -i splitter.png -r 30 -t 3 splitter.mp4
  
  ffmpeg -f concat -i input.txt -codec copy output.mp4

  Where the input.txt looks like :

  file 'E:\video1.mp4'
  
  file 'E:\splitter.mp4'
  
  file 'E:\video2.mp4'

  The content of splitter.png is visible in the splitter.mp4, but not in the output.mp4. Also I’m not entirely sure the splitter.mp4 respects the exact same encoding as the 2 videos, and I don’t know how to verify that.

  Method 2 : insert image frames

  Directly run the concat (demuxer) 90 times (30fps -> 3 seconds) on the image

  ffmpeg -f concat -i input.txt -codec copy output.mp4

  Where the input.txt looks like :

  file 'E:\video1.mp4'
  
  file 'E:\splitter.png'
  
  ...
  
  file 'E:\splitter.png'
  
  file 'E:\video2.mp4'

  Edit : possible solution ?

  Since all I’m doing is screencasting, I might as well screencast my splitter image. This way I would be sure of the audio & video encoding and wouldn’t have any problem merging and it wouldn’t need any reencoding... I know it might sound dumb, but it would probably do the trick...

  Note : I didn’t have try it, since I already worked through Openshot.