[Live-devel] MPEG2TransportStreamIndexer & h264...

[Ross Finlayson]

>I've been trying to use trick play by creating an index file (using
>MPEG2TransportStreamIndexer) for an MPEG-TS (h264/mp3) file.
>I've has no luck with it - been getting an empty index file.
>
>I understand that the indexer is designed to work with mpeg1-2 files.
>Question is whether I should spend some time into making this handle
>h264 files as well. Would that be too difficult?

It's on our "to do" list.  What makes it non-trivial is that the 
index file generation code works by analyzing each of the video 
frames in the Video Elementary Stream embedded within the Transport 
Stream - in order to figure out which frames are 'key frames' (i.e., 
I-frames), and where they are.  I.e., the indexing code would need to 
know the structure of MPEG-4 video frames (just as it currently knows 
about MPEG-2 video frames).


>I've taken my slim chances with a quick and very naive hack in 
>MPEG2IFrameIndexFromTransportStream::analyzePMT()
>...
>  if (stream_type == 1 || stream_type == 2) {
>       fVideo_PID = elementary_PID;
>       return;
>     }
>...
>
>and added
>|| stream_type == 27 (you can see the desperation surely...)
>
>and got the point of a filled index file but naturally the index is
>messed up i think and trick play does not work properly...

See above.
-- 

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/