ffdshow and mpeg[12]

[unixfs]

Hi, is there a way to use ffdshow to decode MPEG 1 and 2?
Since it's based on libavcodec it seems to be possible.
Any help on how to do it (maybe some key association)?

Thanks.

[avih]

afaik, milan (the author of ffdshow) has such plans. but i don't know if it's top priority for him.

cheers
avi

[Didée]

Ah, sorry?

By checking "raw video" in the codecs-properties of ffdshow, ffdshow gets integrated in the filter chain when playing mpeg-1. This is for sure.
Just now, I realize to not have checked this for mpeg-2 ... and dont´t have one handy ATM. Will try it tomorrow.
But again: Mpeg-1 gets decoded by the latest build (16-07).

[Koepi]

It's getting post processed by ffdshow, not decoded, that's a small difference :)
I guess this is what the question is about.

Regards,
Koepi

[avih]

afaik, you can use ffdshow to POSTPROCESS either MPEG4 streams that can be decoded by it OR yuy2 or RGB streams. the MPEG1/MPEG2 checkboxes are disabled, since these can not be DECODED yet. if, however, you have a decoder for these formats, and this decoder outputs either rgb or yuy2, then ffdshow can be used to do postprocessing filterring, if 'raw video' is checked.

cheers
avi

[Didée]

Yes, of course.

Blame on me.

[-h]

The difficulty in decoding MPEG-1 or -2 streams is that a dshow file parsing/demultiplexing filter must be written, not just a stream decoder (i.e. currently we just have the AVI splitter feeding in convenient blobs of compressed video). While I'm not too familiar with dshow (or even the terminology), I think adapting libavcodec's parsing code to the dshow framework would be a pretty sizable headache. Sure would be nice though..

-h