[mythtv] [mythtv-commits] Ticket #2706: Unable to 'watch' Digital Music channels with HDHomeRun

[Andrew Kimpton]

MythTV wrote:
> #2706: Unable to 'watch' Digital Music channels with HDHomeRun
>
>   

> Comment:
>
>  Feature request without patch.
>
>  Music channels are not supported for anything other than Standards
>  compliant DVB streams in MythTV.
>   
I believe these are standards compliant DVB streams - The PAT seems 
valid and the PID filtering seems to be working - from the backend log :


2006-11-20 22:24:59.207 Program Map Table ver(24) pid(0x49) pnum(423) 
len(78)
    Smoothing Buffer Descriptor (0x10) length(6)
    System Clock Descriptor (0xb) length(2)

 Stream #0 pid(0xe40) type(video-mpeg2  0x2)
    Stream Identifier Descriptor (0x52) length(1)
    Video Descriptor (0x2) length(3)
 Stream #1 pid(0xe41) type(unknown  0xc0)
    Stream Identifier Descriptor (0x52) length(1)
    ISO-639 Language: code(eng) canonical(eng) eng(English)
    Private Data Indicator Descriptor (0xf) length(4)
 Stream #2 pid(0xe42) type(audio-ac3  0x81)
    Registration Descriptor: 'AC-3' ATSC audio stream A/52
    Stream Identifier Descriptor (0x52) length(1)
    ISO-639 Language: code(eng) canonical(eng) eng(English)

I don't think there's anything really unusual about these streams except 
that :

a) They have a low I frame rate (say 1 every 10 seconds instead of 2-3 
per second), but it is MPEG2 data.
b) There are a lot of them in one QAM block (approx. 50 for me) - I 
guess the relatively low data rate allows the cable company to 'cram' 
them in.
c) They don't work in Myth

If you'd care to give me some clues as to where I might begin looking 
(HDHomeRunRecorder vs. MPEG decode/filtering vs. lower layer file 
handling ?) I'll be happy to take a look myself, right now however I 
don't know where particularly to start ? I also have a Firewire attached 
settop box connected to the same service and it gives me pretty much 
identical results - so now I'm not so sure the HD HomeRun is really 
involved at all.

Thanks

Andrew 8-)