>Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; > micalg=sha1; boundary="------------ms050109060700050902090703" > >Hi! > >I'm transcoding MPEG-2 (with B-Frames) into MPEG-4 (without >B-Frames, just I and P). Currently I'm just transcoding video, but >later the transcoded streams should by able to be synchronised with >the source's audio stream: > > > --------> Audio -------------------------------- > | | >------------ ------ >| Source | | Sink | >------------ ------ > | ------------ | > --------> Video ---------> | Transcoder | ------ > ------------ > >The problem is setting the timestamps correct. Right now I generate >them when a frame enters the encoder. But then I lose the >information of the incoming frame and won't be able to sync to audio >later on, right? > >When I just pass the times through by setting fPresentationTime = >presentationTime, the transcoded streams "flickers" as if the frames >are presented in the wrong order. > >Is there a possibility to set the presentation times in a way >without losing the ability to sync to the corresponding audio stream?
Note that In your original MPEG-2 stream, with B-frames, the frames will be in decoding order, which is different from the display order, and thus different from the order of frames in the resulting MPEG-4 stream (because that doesn't have B frames). In particular, the presentation times in the original MPEG-2 stream, with B-frames, will *not* be monotonically increasing. You will need to reorder the presentation times accordingly when you convert the stream to MPEG-4 (without B-frames). -- Ross Finlayson Live Networks, Inc. http://www.live555.com/ _______________________________________________ live-devel mailing list [email protected] http://lists.live555.com/mailman/listinfo/live-devel
