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• ffmpeg live stream overlay issues,while any one of the stream is lost other streams are getting stuck

  29 mars 2013, par Samy

  So far we have done

  We have a video chat client which has a set of 9 video streams (users) with
  h.264 codec using Adobe FMS. Now, using ffmpeg we are able to combine these
  streams into one stream using the overlay (video) and amix (audio) filters.
  We are able to send the single combined stream to a live streaming service.
  The stream of the active speaker is shown in a bigger size using the scale
  property of ffmpeg.

  Code as follows :

  ffmpeg -i "rtmp://localhost/live/mystream" -i "rtmp://localhost/live/mystream2 " -i "rtmp://localhost/live/mystream3 "-filter_complex"nullsrc=size=300x300 [b1];[0:v] setpts=PTS-STARTPTS,scale=100x100 [s1];[1:v] setpts=PTS-STARTPTS,scale=200x200 [s2];[2:v]setpts=PTS-STARTPTS,scale=100x100 [s3];[b1][s1] overlay=shortest=1 [b1+s1];[b1+s1][s2] overlay=shortest=1 [b1+s2];
  
  [b1+s2][s3] overlay=shortest=1:x=100" out.mp4

  Help Needed in the following 2 major issues. Any help would be appreciated.

  1. Whenever the active speaker changes, the stream of that user should be shown in a bigger
     size. is this possible to do without restarting the ffmpeg process ?

  2. Right now, if one of the 9 streams stops, the ffmpeg process crashes.

• error : Ordinal 139 could not be located in swscale-2.dll

  2 avril 2013, par JPM

  Nominally an ffmpeg issue but it could be an issue with versions of standard windows libraries & VS

  Running Win 7, VS2010 ; my program uses ffmpeg libraries and dlls so I just upgraded ffmpeg library to ffmpeg-1.1.1 win 32 dev for libraries and win32-shared for dlls.

  Ran my program under debug mode and it runs fine. Changed to Release mode, recompiled all and tried to run. Immediately I get the error message Ordinal 139 could not be located in swscale-2.dll

  Using same dlls for both runs [well, I copied them over from Debug folder to Release folder. Twice] as when I ran in Debug mode.

  Any clues ? This one has me stumped.

  ---

  so i am comparing the property pages between debug and release.

  • both have multi-theaded debug set (c++/code geneeration)
  • release mode has Liner Optimization references set to Yes /OPT:REF whereas debug has nothing ;

  ==> set it to NO and did not get the error message re Ordinal 39 not found.

• h264 Licensing, ffmpeg iPhone transcoding

  28 février 2013, par NadavRub

  Requirements
  
  1. An application that should run, to begin with, on iPhone, and, in the end on a plurality
   of SmartPhone devices.
  2. Aim at having the trans-coding code supporting as much OSs as possible.
  3. Application is commercial.

  Use-case
  
  I. Record video using the portable SmartPhone Camera application
  II. Trans-code the video into a plurality of bit-rates using a cutom app
  

  iPhone Implementation
  
  A. To satisfy requirement [2], Implement Trans-coding using C++
  B. Use ffmpeg for trans-coding.
  

  Problem
  - Using ffmpeg to encode H264 req usage of the x264 lib
  - H264 encoding mandate payment for Licensing.

  In order to avoid H264 Licensing
  - The iPhone device ( and many others ) come with built-in H264 encoding capability
  - Usage of the built-in H264 Codec will avoid licensing problems/restrictions
  

  ---

  Does ffmpeg, supports, in any way, usage of iPhone's built-in H264 encoder ?
  
  
  
  Any help will be appreciated.