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• Extract PRORES Video with 5.1 audio from file with Mono and downmix

  29 March 2021, by user2920456

  I am trying to extract a prores video with just 5.1 audio from a Prores with the below audio track layout. How can I do that using the FFmpeg library?

  


  I could not figure out which command to use from the below ffmpeg library spec
https://trac.ffmpeg.org/wiki/AudioChannelManipulation#a2monostereo

  


  Desired Output PRORES to contain below track layout

  


  

  • track 0 - video (src Stream #0:0)

  


  • track 1 - FL (src Stream #0:1)

  


  • track 2 - FR (src Stream #0:2)

  


  • track 3 - FC (src Stream #0:3)

  


  • track 4 - LFE (src Stream #0:4)

  


  • track 5 - BL (src Stream #0:5)

  


  • track 6 - BR (src Stream #0:6)

  


  • track 7 - tmcd (src Stream #0:8)

  


  


  Below is the source video/audio Track Layout

  


  Stream #0:0(eng): Video: prores (HQ) (apch / 0x68637061), yuv422p10le(tv, bt709, progressive), 1920x1080, 171944 kb/s, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 23976 tbn, 23976 tbc (default)
    Metadata:
      creation_time   : 2019-05-21T01:26:51.000000Z
      handler_name    : Apple Video Media Handler
      encoder         : Apple ProRes 422 HQ
    Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels (FL), s32 (24 bit), 1152 kb/s (default)
    Metadata:
      creation_time   : 2019-05-21T01:26:51.000000Z
      handler_name    : Apple Sound Media Handler
    Stream #0:2(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels (FR), s32 (24 bit), 1152 kb/s (default)
    Metadata:
      creation_time   : 2019-05-21T01:26:51.000000Z
      handler_name    : Apple Sound Media Handler
    Stream #0:3(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
    Metadata:
      creation_time   : 2019-05-21T01:26:51.000000Z
      handler_name    : Apple Sound Media Handler
    Stream #0:4(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels (LFE), s32 (24 bit), 1152 kb/s (default)
    Metadata:
      creation_time   : 2019-05-21T01:26:51.000000Z
      handler_name    : Apple Sound Media Handler
    Stream #0:5(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels (BL), s32 (24 bit), 1152 kb/s (default)
    Metadata:
      creation_time   : 2019-05-21T01:26:51.000000Z
      handler_name    : Apple Sound Media Handler
    Stream #0:6(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels (BR), s32 (24 bit), 1152 kb/s (default)
    Metadata:
      creation_time   : 2019-05-21T01:26:51.000000Z
      handler_name    : Apple Sound Media Handler
    Stream #0:7(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, downmix, s32 (24 bit), 2304 kb/s (default)
    Metadata:
      creation_time   : 2019-05-21T01:26:51.000000Z
      handler_name    : Apple Sound Media Handler
    Stream #0:8(eng): Data: none (tmcd / 0x64636D74) (default)
    Metadata:
      creation_time   : 2020-03-17T19:58:52.000000Z
      handler_name    : Time Code Media Handler
      reel_name       :
      timecode        : 00:00:00:00


  


• iPAD Streaming video to a ffmpeg server. front facing camera

  6 December 2011, by IrishGringo

  This is a video chat type program.
  My project is to write a native ObjC app that will stream video from the front facing camera to a server. This server will format and relay to be sent to another location.
  In a related question, I want to display video streaming from the server. The video server will probably be running ffmpeg for formating.
  But this question is just asking advice for the iPAD project. I wanted to get comments about issues I need to be thinking about.

  This is my strategy:
  I was thinking of using AVFoundation framework to stream from the cam to a URL server. I don't know if I will be formatting on the client or no, so some comment there would be interesting. http://developer.apple.com/library/mac/#documentation/AVFoundation/Reference/AVFoundationFramework/_index.html

  For streaming the video, I was going to be using:
  http://developer.apple.com/library/IOs/#documentation/AVFoundation/Reference/AVCaptureSession_Class/Reference/Reference.html#//apple_ref/occ/cl/AVCaptureSession

  so if someone has some ideas/suggestions... extra code I can look at. I would appreciate it.

• Video Surveliance application by connecting DVR

  14 May 2014, by iMOBDEV

  I am trying to connect to the DVR so that I can view video recording on my IOS device, I tried to search a lot but could not find a single useful link to move ahead with connecting to the DVR. I found that, it can be done using FFMPEG, but could not be able to do what to do and how to do.

  What I need to do is: connect to the IP address and port where the DVR is configured, give username and password for that DVR to connect to the DVR. Something like following link:

  https://itunes.apple.com/en/app/vmeye/id365532547?mt=8

  Guide me with useful links to move ahead with connecting to the DVR.