[Live-devel] key frames (I-frames) in the recorded AVI file

[Dmitry Petrenko]

Hi Ross,

I just was wondering if it's possible to calculate and write keyframe index information to the recorded AVI files using AVIFileSink? Implementation of this class has some hints (like setting AVIF_HASINDEX and AVIF_TRUSTCKTYPE flags in AVI header) but where is the the actual implementation?

Kind regards,
Dmitriy Petrenko
  ----- Original Message ----- 
  From: Dmitry Petrenko 
  To: LIVE555 Streaming Media - development & use 
  Sent: Wednesday, December 08, 2010 1:07 AM
  Subject: key frames (I-frames) in the recorded AVI file


  Hi Ross,

  I have noticed that when I'm recording video stream to AVI file using LIVE555 (evein if I'm using openRTSP sample app), the output file does not contain any key frames exept for the very first one.

  E.g. when I open the recorded file in Virtual Dub and go to FIle->File Information, the "Number of key frames" is always 1, whatever is the length of the recorded video. Or, if I execute search for the key frame using AVIStreamFindSample() VFW API function, it always return 0 (the very first frame), whatever start search position I do specify in call.

  As a video source I'm using Axis 241S/241Q video servers, and they are configured to stream I-frame followed by 7 P-frames (GOV Settings Structure: IP, Length: 8).

  Could you please advise what could be the reason of such strange behaviour?

  Kind regards,
  Dmitriy Petrenko
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