[Live-devel] Server 'trick play' support for MPEG Transport Stream files

[DNA Studios s.r.l.]

You can test here (Darwin streaming server):
rtsp://85.18.216.107/sampleQT.mov     Standard mov file in bundle with 
DSS (hinted with quicktime i think)
rtsp://85.18.216.107/eltonjohn.mp4      Movie encoded with x264 (main 
profile) and hinted with mpeg4ip

see you soon ;)


Glen Gray ha scritto:
> Excellent stuff, thanks Ross.
>
> Ross Finlayson wrote:
>   
>> Our RTSP server implementation (and therefore the "LIVE555 Media 
>> Server", and the "testOnDemandRTSPServer" demo application) now 
>> supports 'trick mode' operations (seeking, fast forward, reverse 
>> play) when streaming MPEG Transport Stream files.
>>
>> For this to work, each Transport Stream file must have (in the same 
>> directory) a corresponding index file' (with name suffix ".tsx).  You 
>> create these index files using the "MPEG2TransportStreamIndexer" 
>> application, whose code is distributed in the "testProgs" directory.
>>
>> NOTE: Before you run this application, please upgrade to the latest 
>> version (2007.01.11) of the "LIVE555 Streaming Media" code, and 
>> rebuild it.  (Earlier versions of the code had a bug that prevented 
>> the application from working properly on some Transport Stream files.)
>>
>> To generate each index file, run
>> 	MPEG2TransportStreamIndexer <transport-stream-file-name>
>> Be warned that this program is currently rather slow, so I suggest 
>> running it on the fastest computer that you have.
>>
>> Once you've generated an index file for each Transport Stream file 
>> that you wish to stream, our RTSP server implementation will now 
>> handle 'trick mode' operations on the file.
>>
>> Unfortunately, VLC's GUI currently doesn't handle the trick mode 
>> operations properly.  (The "LIVE555 Streaming Media" code - which 
>> implement's the RTSP client protocol in VLC - has all the hooks for 
>> doing these trick mode operations; however, the VLC code above this 
>> does not yet use this properly.)  I'll be working with the VLC 
>> developers to try to get this resolved ASAP, so we can have versions 
>> of VLC that perform trick play on Transport Streams properly.
>>
>> Unfortunately the only other client that I know of right now that 
>> supports 'trick play' operations on MPEG Transport Streams is the 
>> Amino set-top box (hardware).  (This is what I have been using for 
>> testing, pending a resolution of the problems with VLC.)
>>
>> (If anyone knows of any other clients that work, please let us know. 
>> The 'trick mode' operations are all a standard part of the RTSP 
>> protocol, so there are likely to be other clients out there that 
>> support it.)
>>
>>
>> In the meantime, once you have generated your index files, you can 
>> try running a demo application called 
>> "testMPEG2TransportStreamTrickPlay" (also in the "testProgs" 
>> directory) to simulate the effect of 'trick play' operations on 
>> Transport Stream files.  To run it:
>> 	testMPEG2TransportStreamTrickPlay 
>> <input-transport-stream-file-name> <start-time> <scale> 
>> <output-transport-stream-file-name>
>> where
>> 	<input-transport-stream-file-name> is the original Transport 
>> Stream file name (which must end with ".ts").  There must also be a 
>> corresponding index file for this file.
>> 	<start-time> is the starting play time in seconds (use 0 to 
>> play from the start)
>> 	<scale> is a non-zero integer, representing the playing speed 
>> (use a negative number for reverse play)
>>
>> Examples (assume that your original Transport Stream file is named 
>> "foo.ts", and that you have already generated an index file, named 
>> "too.tsx"):
>>
>> testMPEG2TransportStreamTrickPlay foo.ts 0 8 foo8.ts
>> 	The output file "foo8.ts" is the original stream, sped up 8x
>>
>> testMPEG2TransportStreamTrickPlay foo.ts 30 -1 foo-1.ts
>> 	The output file "foo-1.ts" is the original stream, played 
>> backwards (at 1x speed), starting from the 30 second point.
>>
>> testMPEG2TransportStreamTrickPlay foo.ts 30 -5 foo-5.ts
>> 	The output file "foo-5.ts" is the original stream, played 
>> backwards (at 5x speed), starting from the 30 second point.
>>     
>
>
>   
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