[Live-devel] temporal reference and Picture types for TS streams

[Rajesh]

Hi All
what is the functionality of  testMPEG2TransportStreamer.exe.

with regards
rajesh


----- Original Message ----- 
From: "Shaswata Jash" <shaswata at alumnux.com>
To: "LIVE555 Streaming Media - development & use" 
<live-devel at ns.live555.com>
Sent: Friday, September 08, 2006 3:03 PM
Subject: Re: [Live-devel] temporal reference and Picture types for TS 
streams


> Hi Mallikharjuna,
>
> According to RFC-2250, encapsulation (i.e. adding MPEG1/2 specific fixed
> headers) is done only on elementary streams. Even if MPEG -PS is used, 
> live
> first extracts the ES from it and then uses the encapsulation rule over 
> it.
> In fact according to the RFC, if a server would have directly streamed the
> MPEG-PS, there is no need of any encapsulation (Ref: Section 2 of the 
> RFC).
> Similarly for MPEG-TS, the RFC states only that each RTP packet must 
> contain
> integral number of 188 bytes of MTS packets (Ref: Section 2 of the RFC) 
> and
> there is no need of MPEG specific headers until and unless the RTP packets
> contains TS packets as it is.
> So if the server is intelligent enough to extract the elementary stream 
> from
> a TS stream and then stream out following the encapsulating rule of
> RFC-2250, then only in the client side those information can be found.
> Another solution can be - let the server stream the TS packets, but the
> client parses those packets to find the information of temporal reference
> and picture type (because these informations can be found from the 
> MPEG-bit
> streams too).
> Also, can we not use the virtual-function called processSpecialHeader()
> (which can be accessed in classes derived from RTPSource) to get the each
> RTP packet in the client side - in that case, will it not be cleaner 
> design?
>
> With regards,
> Shaswata
>
> ----- Original Message ----- 
> From: "Mallikharjuna Reddy (NAVT)" <ymreddy at ssdi.sharp.co.in>
> To: "'LIVE555 Streaming Media - development & use'"
> <live-devel at ns.live555.com>
> Sent: Friday, September 08, 2006 2:00 PM
> Subject: [Live-devel] temporal reference and Picture types for TS streams
>
>
>>
>> Hello All,
>>
>> We are trying to capture the temporal reference and picture types for TS
>> streams from MPEG Video-specific header after parsing the RTP fixed
> headers
>> on the client side. We could able to do it for ES and PS streams in
>> networkReadHandler() function. But the same functionality is not working
> for
>> TS streams. Also we observed that on the server side for TS streams, MPEG
>> Video-specific header is not attached to each RTP packet after the RTP
> fixed
>> header. We are using testMPEG2TransportStreamer.cpp for streaming TS
> files.
>>
>> Any clues on this.
>>
>> Thanks and Regards
>> Y. Mallikharjuna Reddy
>> _______________________________________________
>> live-devel mailing list
>> live-devel at lists.live555.com
>> http://lists.live555.com/mailman/listinfo/live-devel
>>
>
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