[mythtv-users] UK DVB-T Channels 4, 5; multiple video streams

[John Pilkington]

On 04/06/13 19:46, John Pilkington wrote:
> On 04/06/13 12:26, John Pilkington wrote:
>> Last week the BBC mux from my local transmitter was moved to clear G4
>> spectrum.  Since then my recordings from Channels 4 and 5 have
>> apparently included multiple video streams.  This breaks my cutting
>> script.  A simple edit ought to fix that, but has anything else changed
>> too?
>>
>> $ ionice -c3 mythffmpeg -i  1005_20130603185800.mpg
>> ffmpeg version 0.10.2.git Copyright (c) 2000-2012 the FFmpeg developers
>>    built on Apr 27 2013 17:23:40 with gcc 4.7.2 20120921 (Red Hat
>> 4.7.2-2)
>
> <snip>
>
>> Input #0, mpegts, from '1005_20130603185800.mpg':
>>    Duration: 01:07:58.37, start: 51087.044133, bitrate: 2824 kb/s
>>      Stream #0:0[0xb22]: Video: mpeg2video (Main), yuv420p, 704x576 [SAR
>> 16:11 DAR 16:9], 15000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
>>      Stream #0:1[0xb23](eng): Audio: mp2, 48000 Hz, stereo, s16, 192 kb/s
>>      Stream #0:2[0xb25](eng): Audio: mp2, 48000 Hz, mono, s16, 64 kb/s
>>      Stream #0:3[0xb24](eng): Subtitle: dvb_subtitle
>>      Stream #0:4[0x806]: Video: mpeg2video, 90k tbr, 90k tbn, 90k tbc
>>      Stream #0:5[0x8cb]: Video: mpeg2video, 90k tbr, 90k tbn, 90k tbc
>>      Stream #0:6[0x8cc]: Video: mpeg2video, 90k tbr, 90k tbn, 90k tbc
>
> mediainfo --version
> MediaInfo Command line,
> MediaInfoLib - v0.7.52
>
> mediainfo sees only the expected first four streams, with nothing
> conspicuously wrong.  I guess mythffmpeg just picked a bad sampling
> region, but I don't remember seeing results like this before.
>

I'm seeing the same results on my ScientificLinux6 laptop, and on 
Channel 3 (ITV), which is on the same mux as Channels 4 and 5.  It looks 
as if my script should now grep 'mpeg2video (Main)' instead of just 
'Video' in the section aimed at selecting the video and audio PIDs.  The 
same change was needed a few months ago in MythArchive to allow DVD 
creation from DVB-T recordings without re-encoding.