Recherche avancée

Sur d’autres sites (9742)

• Extract Video Meta Data from First Few MB on S3

  22 août 2016, par David Williams

  I have a large collection of video files on S3. I also have application servers running in AWS running a Java webapp. From those application servers, I would like to be able to extract metadata from each video file such as is provided by the Quicktime movie inspector :

  Source: /home/me/foo.mov
  
  Format: H.264, 1920x1080
  
  FPS: 29.97
  
  Data Size: 16.8 MB
  
  Data Rate: 6.70 Mbit/s

  Now, I can clearly get this information from ffmpeg :

  $ ffmpeg -i /home/me/foo.mov
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/me/foo.mov':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 1
  
      compatible_brands: isomavc1mp42
  
      creation_time   : 2014-06-30 22:40:08
  
    Duration: 00:00:20.02, start: 0.000000, bitrate: 6698 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 6696 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        creation_time   : 2014-06-30 22:39:09
  
        handler_name    : GPAC ISO Video Handler

  I could easily parse out the equivalent fields to the Quicktime output ! But, this would require I have the file locally. Is it possible to do this from the first few MB (or some other mechanism) of a file hosted on S3 without downloading the whole thing locally ? The goal here is to extract the same fields as the quicktime inspector from a file on S3. Any ideas ?

• avcodec : clarify some decoding/encoding API details

  6 mars 2017, par wm4

  avcodec : clarify some decoding/encoding API details
  Make it clear that there is no timing-dependent behavior. In particular,
  
  there is no state in which both input and output are denied, and where
  
  you have to wait for a while yourself to make progress (apparently some
  
  hardware decoders like to do this).
  Avoid wording that makes references to time. It shouldn’t be mistaken
  
  for some kind of asynchronous API (like POSIX read() can return EAGAIN
  
  if there is no new input yet). It’s a state machine, so try to use
  
  appropriate terms.
  Signed-off-by : Diego Biurrun <diego@biurrun.de>
  Merges Libav commit 8a60bba0ae.
  

  • [DH] libavcodec/avcodec.h

• avcodec/opusdec : Fix delayed sample value

  7 mars 2015, par Michael Niedermayer

  avcodec/opusdec : Fix delayed sample value
  Fixes out of array access
  
  Fixes : ffmpeg_opus_crash1.ogg
  This solution is likely not optimal in terms of error concealment but
  
  its simple and fixes the out of array access.
  Found-by : Thomas Lindroth <thomas.lindroth@gmail.com>
  
  Tested-by : Thomas Lindroth <thomas.lindroth@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/opusdec.c