[vlc-devel] Playing only I-frames

John Michael Zorko j.zorko at att.net
Wed Aug 6 13:29:41 CEST 2003

Hello, all ...

I would like to make VLC play only I-frames when told to.  However, the 
code in $vlc_root/modules/demux/mpeg/ps.c -- the Demux() function via 
function pointers to ReadPS() and DemuxPS() -- deals with MPEG packs 
i.e. it aligns itself on the pack header, reads the pack and aligns 
itself on the next pack header to read the next time through the loop.  
So it appears that packs are the things that are stuffed into the FIFO 
here, and the decoder module hands this stuff off to ffmpeg or whatever 
to do the heavy stuff i.e. anything lower than a pack is not a VLC 
thing, but an ffmpeg / libavcodec thing.  Is this correct?



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