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• mfenc : Avoid including codecapi.h, fix building in UWP mode with clang

  25 mai 2020, par Martin Storsjö

  mfenc : Avoid including codecapi.h, fix building in UWP mode with clang
  Including codecapi.h and uuids.h in UWP mode doesn't define all defines
  
  properly, ending up with constructs that MSVC silently tolerates, but
  
  that clang errors out on, like this :
  
      DEFINE_GUIDEX(CODECAPI_AVEncCommonFormatConstraint) ;
  Just avoid including codecapi.h completely and hardcode the last few
  
  enum values we use from there. We already use local versions of most
  
  enums from there, due to older mingw-w64 headers being incomplete.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/mf_utils.h
  • [DH] libavcodec/mfenc.c

• HTML5 / and live transcoding with FFMPEG

  13 mai 2020, par TooTallNate

  So from my web server, I would like to use FFMPEG to transcode a media file for use with an HTML <audio></audio> or <video></video> tag. Easy enough right ?

  



  The conversion would need to take place in real-time, when an HTTP client requested the converted file. Ideally the file would be streamed back to the HTTP client as it is being transcoded (and not afterwards at the end, since that would potentially take a while before any data starts being sent back).

  



  This would be fine, except that in today's browsers, an HTML5 audio or video tag requests the media file in multiple HTTP requests with the Range header. See this question for details.

  



  In that question linked above, you can see that Safari requests weird chunks of the file, including the ending few bytes. This poses a problem in that the web server WOULD have to wait for the conversion to finish, in order to deliver the final bytes of the file to conform to the Range request.

  



  So my question is, is my train of thought right ? Is there a better way to deliver transcoding content to an <audio></audio> or <video></video> tag that wouldn't involve waiting for the entire conversion to finish ? Thanks in advance !

  


• mac terminal ffmpeg batch recursive conversion preserving directory structure

  13 avril 2020, par kidnim

  i'm using ffmpeg on mac to batch convert .flv to .mp4 files. i'm trying to find all files in subdirectories of the current directory and save new files in the same directory.

  



  for instance starting with :

  



  subdirectory1/video1.flv
subdirectory1/video2.flv
subdirectory2/video1.flv


  



  and ending with

  



  subdirectory1/video1.mp4
subdirectory1/video2.mp4
subdirectory2/video1.mp4


  



  i've gotten this far but can't figure out how to save with preserved recursive directories

  



  for i in  `find -name . "*.flv"`; do ffmpeg -i "$i" "${i%.*}.mp4"; done