[Live-devel] openRTSP, Trick Mode, and Transport Streams

[Ross Finlayson]

>I am able to test trick mode functionality using 
>testMPEG2TransportStreamTrickPlay at various scales and in both 
>directions.  However, when I try to test with openRTSP I see some 
>strange results.  I modified the call to the function 
>playMediaSession() as you describe in a previous thread ("Trick play 
>problems", 4/16/2007) to accept arguments for start time, end time, 
>and scale.  I am using a start time of 0.0f and an end time of 
>-1.0f.  With a scale of 1.0f, everything works well, with openRTSP 
>creating a file (video-MP2T-1) locally.  When I try scale = 2.0f, it 
>still creates the same file, but with the same size and scale as the 
>first (verified by playback with VLC).  If I try scale = 4.0f, 
>openRTSP creates the file video-MP2T-1, but it remains at size zero 
>and openRTSP appears to do nothing.

That's odd.  Are you using the latest version of the code?  (Version 
2007.07.01 fixed a bug that affected 2x speedup (although it should 
not have affected 4x speedup).)

I have tested the latest version of the code (2007.07.10), and it 
works OK for me.

(In each case, I modified the call to "playMediaSession()" at line 65 
of "testProgs/openRTSP.cpp".


>  I need a method of verifying trick mode over RTSP.  Also, the 
>directions for using Trick Mode state that the scale must be an 
>integer.  This means that scales less than 1 are not support (i.e. 
>slow motion)?

Not for Transport Streams, with our implementation.
-- 

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