[linux-dvb] I-Frame Detection

Nico Sabbi nicola_sabbi at fastwebnet.it
Thu Oct 4 18:44:55 CEST 2007


Il Thursday 04 October 2007 15:34:11 Thomas Lagemann ha scritto:
> Hi there,
> this is a bit off-topic since it is not a really linux-specific
> question, but maybe someone does know this right away.
> I'm lookig for a way to recognize the type of a video-frame in
> MPEG-2 (I.P or B) to create smooth transitions between video files,
> without having to decode the whole frame. I looked through the
> MPEG-2 TS and PES definitions, but all i found was a
> splicing_point_falg in the TS Adaptation Field. Unfortunately the
> hardware-encoder i'm working with doesn't seem to set these flags.
>
> Does anybody know another way how to determin the frame type?
>

you need to demux the video stream and analyze the picture_coding type
in the picture_header. Search for some draft of ISO 13818-2 in google



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