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What format is it?

And if you don't know the format, you can use tools like Mediainfo to identify it.

What format is it?

For example, I add a time stamp for every packet. The original file of video content we download from server is like this, "...AADBCE..."; now it is like this "...AAD134BCE...". It is encoded and I need to send them to video decoder of VLC, right? New format means the transmission time of that packet is 134 seconds. But how can VLC play this new format file.

Thank you.

New format means the transmission time of that packet is 134 seconds. But how can VLC play this new format file.

Is the data in container level? If so, the demux modules are the ones you are looking for http://git.videolan.org/?p=vlc.git;a=tr ... ules/demux
If the data is in codec level, then look for decoders http://git.videolan.org/?p=vlc.git;a=tr ... ules/codec

New format means the transmission time of that packet is 134 seconds. But how can VLC play this new format file.

Is the data in container level? If so, the demux modules are the ones you are looking for http://git.videolan.org/?p=vlc.git;a=tr ... ules/demux
If the data is in codec level, then look for decoders http://git.videolan.org/?p=vlc.git;a=tr ... ules/codec

Thx, I understand your meaning. What I plan to do is that when we use VLC to play a video file, it will open a local video content file and a packet arrival time file which records how long time of a video packet is. And the time file will control when the video packet is sent to VLC to play. If we modify the time value to be larger, the playing delay will be longer when the video is played.

I think I need to modify the "open file function" in /modules/access/file.c. Am I right?

Thx

If you open local files, then file.c is the right file to modify.