[mythtv-users] SD DVB-T in the UK: Surround Sound?

[Paul Gardiner]

On 14/01/2011 12:06, Alex Butcher wrote:
> On Fri, 14 Jan 2011, Paul Gardiner wrote:
>
>> On 14/01/2011 10:33, John Pilkington wrote:
>>> My recording of the first episode of the new series "Human Planet" from
>>> BBC1 (SD DVB-T) is marked as being in "Surround Sound". I don't think
>>> I've seen this before. I've now deleted the original recording but
>>> ffmpeg -i looks as usual:
>>>
>>> Stream #0.0[0x258]: Video: mpeg2video, yuv420p, 720x576 [PAR 64:45 DAR
>>> 16:9], 15000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
>>> Stream #0.1[0x259](eng): Audio: mp2, 48000 Hz, 2 channels, s16, 256 kb/s
>>> Stream #0.2[0x25a](eng): Audio: mp2, 48000 Hz, 1 channels, s16, 64 kb/s
>>> Stream #0.3[0x25d](eng): Subtitle: dvbsub
>>> Stream #0.4[0x261]: Data: [5][0][0][0] / 0x0005
>>>
>>> Is this a real New Thing or just a mistake in the flags?
>>
>
> We're talking about the 256kbps stereo stream and the 64kbps mono streams,
> right? I think I see these a lot. This is why I added logic to pick the
> 'best' (um, biggest!) audio stream to mythburn.py.
>
>> Might it be flagging the use of pro logic?
>
> Or a Welsh soundtrack? Or a descriptive narration for the
> visually-impaired?

No, I mean marking it as "Surround Sound" may just mean the main
stereo stream encodes a pro-logic back channel. BBC have been
using pro-logic for ages.

Paul.