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• FFMPEG Incompatible sprop-parameter-sets with libstagefright on Android 4.0 for H264

  7 août 2012, par user1582384

  I am having an issue with the RTSP SDP generated by FFMPEG in Android.
  I have the FFMPEG 0.11.1 compiled with NDK and running on Android. I use the FFSERVER to stream an mp4 file locally to the MediaPlayer.

  Here is the generated SDP description :

  08-07 14:04:04.034 : V/rtsp_server(20161) : o=- 0 0 IN IP4 127.0.0.1

  08-07 14:04:04.034 : V/rtsp_server(20161) : s=No Title

  08-07 14:04:04.034 : V/rtsp_server(20161) : c=IN IP4 0.0.0.0

  08-07 14:04:04.034 : V/rtsp_server(20161) : t=0 0

  08-07 14:04:04.034 : V/rtsp_server(20161) : a=tool:libavformat 54.6.100

  08-07 14:04:04.034 : V/rtsp_server(20161) : m=video 0 RTP/AVP 96

  08-07 14:04:04.034 : V/rtsp_server(20161) : b=AS:312

  08-07 14:04:04.034 : V/rtsp_server(20161) : a=x-dimensions:512,384

  08-07 14:04:04.034 : V/rtsp_server(20161) : a=rtpmap:96 H264/90000

  08-07 14:04:04.034 : V/rtsp_server(20161) : a=fmtp:96
  packetization-mode=0 ;profile-level-id=640015 ;sprop-parameter-sets=J2QAH62ECSZuIzSQgSTNxGaSECSZuIzSQgSTNxGaSECSZuIzSQgSTNxGaSEFWuvX1+T+vyfXrrVQgq116+vyf1+T69daq0BAGMg=,KO48sA==

  08-07 14:04:04.034 : V/rtsp_server(20161) : a=control:streamid=0

  08-07 14:04:04.034 : V/rtsp_server(20161) : m=audio 0 RTP/AVP 97

  08-07 14:04:04.034 : V/rtsp_server(20161) : b=AS:29

  08-07 14:04:04.034 : V/rtsp_server(20161) : a=rtpmap:97
  MPEG4-GENERIC/44100/1

  08-07 14:04:04.034 : V/rtsp_server(20161) : a=fmtp:97
  profile-level-id=1 ;mode=AAC-hbr ;sizelength=13 ;indexlength=3 ;indexdeltalength=3 ;
  config=1208

  08-07 14:04:04.034 : V/rtsp_server(20161) : a=control:streamid=1

  Running the same application on Galaxy S2 works since it uses libopencore. But on newer devices it crashes while trying to extract the width and height from the extradata.

  So the problem is with the sprop-parameter-sets.

  My question is why does libstagefright parse the sprop-parameter-sets differently and how could the existing string be converted for compatibility ?

• Sorenson Video 3 For Posterity

  12 août 2010, par Multimedia Mike — Software Museum

  On a recent dumpster dive, I procured a complete, never-been-opened copy of Sorenson Video 3 Professional Edition Compressor for Windows. And because I’m me, I thought it would be interesting to document it here :

  
  

  
  

  Not opened until now, anyway :

  
  
  

  I chuckled at the thought that I might open the user manual and find the complete data stream format listed therein. As expected, the guide offers a broad overview of video compression concepts (lossy vs. lossless, inter/intraframes, that kind of thing) and goes on to describe general guidelines for compressing different types of data. Then there is the feature reference. There are standard features and professional features (the latter includes things like bidirectional prediction, masking, and watermarking).

  I was hoping to figure out how to encode some video with this software. But I think I need full Quicktime Pro in order to do that. If you’re interested, here’s the user manual in PDF format : Sorenson Video 3 User Guide (626 Kbytes). Here’s an interesting claim from the chapter on audio compression :

  Most movies are made up of two parts, video and audio. Historically, the video portion of a digital movie was so large that the audio was only a minor piece of the puzzle. However, with Sorenson Video’s excellent compression capabilities it is possible to create a file where audio is the largest portion.

  I know it’s possible to do that, but is it really recommended ? I’m sure I have some samples in my vast repository where this is the case but it still doesn’t strike me as optimal for network delivery.

• How to use FFmpeg Library in iOS Swift ?

  14 mars 2020, par WASH IT firm

  I have integrated FFmpeg Library in Xcode successfully. But I don’t know, how to use it, how to run FFmpeg commands ?? If anyone has any example of how to use it. That’d be really appreciated.

  I have integrated it by following this guide.

  Any help will be highly appreciated. Thanks