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• Merge commit ’a536a4e4bc52d05f59869761337452fb1f1977f6’

  27 janvier 2015, par Michael Niedermayer

  Merge commit ’a536a4e4bc52d05f59869761337452fb1f1977f6’
  * commit ’a536a4e4bc52d05f59869761337452fb1f1977f6’ :
  
    lavc : support extracting audio service type from side data
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/utils.c

• How to build a daemon to encode video files on S3 ?

  4 avril 2013, par Yuval Cohen

  I am interested in running a daemon to go over user uploaded video files and encode them in an optimal format (and add some watermarks).

  I was considering services such as Zencoder, Encoding.com, Amazon's encoding service but some lack overlaying capabilities and some are just too expensive for our (big) volumes.

  I want to build a daemon that encodes videos that are located on S3 once users upload them.

  The solution I thought of would be Python Heroku servers using Celery for a task queue to keep track of the encoded files and ffmpeg to do the actual work. However, I ran into troubles compiling ffmpeg for Heroku (with libass support, so the basic ffmpeg bins aren't enough).

  What approach/technology stack would you consider for this mini-project ?

  Thanks !
  Yuval

• Get "Delay relative to video" value using ffmpeg

  22 avril 2023, par user3449922

  I like to known if is possible detect via ffmpeg the value of property "Delay relative to video" showed here :

  


  Audio #2
ID                                       : 3
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Codec ID                                 : A_AC3
Duration                                 : 10 min 0 s
Bit rate mode                            : Constant
Bit rate                                 : 320 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 32 bits
Compression mode                         : Lossy
Delay relative to video                  : 1 s 78 ms
Stream size                              : 22.8 MiB (1%)
Language                                 : rom
Service kind                             : Complete Main
Default                                  : No
Forced                                   : No


  


  Thank you !