[Live-devel] Index onlive stream

[Ross Finlayson]

>I am trying to capture a live stream (which is MPEG2TS) via openRTSP and
>instead of recording it in 'video-MP2T-1', index the received video
>on-live.
>
>FramedSource* video1 = sources[0]; //I caught it from MediaSubsession
>MediaSink* outputIndexerSink = FileSink::createNew(*env, "out.tsx");
>FramedSource* indexer = MPEG2IFrameIndexFromTransportS
>tream::createNew(*env, video1);
>
>outputIndexerSink->startPlaying(*indexer, subsessionAfterPlaying, NULL);
>
>when I run it, I get these errors:
>MultiFramedRTPSource::doGetNextFrame1(): The total received frame 
>size exceeds the client's buffer size (188).  940 bytes of trailing 
>data will be dropped!
>
>what seems to be the problem?

In principle, what you are doing is exactly right.  In practice, 
though, the problem is that the "MPEG2IFrameIndexFromTransportStream" 
object reads just one 188-byte MPEG Transport 'packet' at a time, 
into a 188-byte buffer.  However, the upstream object 
"SimpleRTPSource" (a subclass of "MultiFramedRTPSource") delivers a 
whole network packet's worth of data, which is usually much larger.

To overcome this, you will need to write a new filter object and 
insert it between "video1" and "indexer" in your code.  This filter 
object will be of a subclass of "FramedFilter" that you'll need to 
write yourself.  It will read network packet data into a large 
buffer, and deliver - from this buffer - 188-byte MPEG Transport 
'packets', one-at-a-time, to its downstream reader ("indexer").
-- 

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