[mythtv] [Experimental PATCH] BIG DVB PATCH V3.2 Released

[Tj]

Marcus Metzler wrote:

>So the AC3 problem should be fixed in CorrectStreamNumber, which it is
>by the latest patch and nowhere else.
>  
>
For my case its not. Something is still wrong somewhere, I don't know 
what yet. The patch I did to mpeg.c allows me to use the software ac3 
decoder. This patch may very well be an introduced bug to cancel out a 
bug which I can't find yet.

I am in Australia, where broadcasts are transmitted in the DVB format. 
For my case  ip->cid is already 0xbd for AC3, 0xc0 for MPEG2 audio, and 
0xe0 for video when CorrectStreamNumber is called (I only run it for a 
short while so I may very well be wrong here)..

The original function replaces all audio with 0xc0 (hence everything 
calls the software mpeg decoder),  but the patch in DVB v3.2 just sets 
ip->cid to the same original value (which is better as even if/when the 
original value is wrong, the new CorrectStreamNumber will hopefully set 
it correctly).

AC3 passthru to an external AV receiver may work just by fixing up 
CorrectStreamNumber (I don't know as I don't have a AV receiver), but 
software decoding doesn't work, mythfrontend crashes on my machine at 
ScanStreams.

Just found out that in ScanStreams, the line:

AVCodec *codec = avcodec_find_decoder(enc->codec_id);

evals to nothing as enc->codec_id = 86021 which is 0x15005 which is 
CODEC_ID_DTS. (incidently I couldn't register the DTS codec). I am 
tempted to just swap the order of CODEC_ID_DTS and CODEC_ID_AC3 in 
avcodec.h and see if it works. At the moment trying to find out where 
0x15005 comes from.

My apologies for the misconceptions in the A52/AC3 specs... :(



Regards.