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LINUX MPEG 2 DECODER MOD
LINUX MPEG 2 DECODER SOFTWARE
LINUX MPEG 2 DECODER CODE

LINUX MPEG 2 DECODER CODE

This works pretty well, but unfortunately all the timing code is very VLC-specific and not easy to reuse.

VLC ( VideoLAN Client) low-pass filters the incoming clock references and uses a linear approximation algorithm to approach the server clock reference.

naive codes just watch the buffer fuel level and drop or delay frames.

LINUX MPEG 2 DECODER SOFTWARE

Software decoders followed different approaches in the past: Hardware MPEG-2 decoders use voltage-controlled oscillators or numerically controlled oscillators for this purpose. This reference allows the client to synchronize it's own clock to the one of the server. The Solution is the PCR (Program Clock Reference): a special clock reference value transmitted every few MPEG-2 TS packets in the TS packet header.

The server clock may run continously faster or slower than the host clock, so the time difference may increase with time.

This delay should get minimized, otherwise you always hear your neighbors celebrating the soccer championship goal 3 seconds before you can see it.

Transmitted data is bursty, the decoder has to display content with a little delay.

Whenever a client has to decode a live stream from a server it has to adjust its own STC (System Time Clock) relative to the one of the server, for several reasons: See the PID Filter - Demultiplexer section for details and code. The incoming MPEG-2 Transport Stream contains MPEG-2 packets of all transmitted services on this transponder, so we need to peel out the ones that are interesting for us. So the incoming data needs to get aligned to packet boundaries, this is achievable by a simple state machine, see the MPEG-2 Frame Aligner article for a detailled discussion and some sample code. Most DVB cards don't output the MPEG-2 data aligned to 188byte or 204byte MPEG-2 packet boundaries: this would be hard to achieve on most hardware since DMA controllers are much simpler and cheaper to implement if they can rely on some alignment assumptions.

10 Color Correction, the Gamma Question.

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LINUX MPEG 2 DECODER MOD

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