[Ffmpeg-devel] mpeg2 in libavcodec - mux multiple video streams into one mpeg2 stream
Thu Aug 3 12:10:51 CEST 2006
a rather simple question in relation to using libavcodec to encode (and
eventually decode) multiple video programs in a single mpeg2 stream.
>From my understanding of mpeg2 - it allows for mulitplexing of multiple
video streams into a single data stream (e.g. frames from multiple cameras
are encoded into multiple packatised elementary streams [pes] which are then
multiplexed at the encoding stage into either a transport or a program
the api example in libavcodec shows nicely the encoding (and subsequent
decoding) of video frames, but not in a case of multiplexing frames from
multiple video sources/streams (e.g. how would one select which video stream
to decode when decoding mpeg2 stream and how would one denote which video
stream should be associated with a given frame when encoding, etc.) ... my
understaing is that it is important to have multiplexing at packet level (as
multiplexing at frame level will result in a too big latency if there are
say 24 video streams being encoded - the last stream will be about 1 sec.
late...) so the notion of just encoding one frame at a time for various
video streams and then multiplexing those is not too cool...
may be I am missing something here... but first question is:
does libavcodec support multiplexing multiple video streams in a single
mpeg2 data stream?
if so - a quick pointer to example or open source program which uses this
if not - any other altenative open source lib which would be able to do so?
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