[mythtv-users] Live TV recording file size double size of DVBViewer on Windows 7?

[David Crawford]

On 12 March 2012 17:23, Andy Sheen <sheen.andy at googlemail.com> wrote:

>
>
> David Crawford wrote on Mon 12 Mar at 17:09 UK time
>
>
>
>>  Here's a link to .ts file from DVBviewer. Hardly any noticeable
> difference in quality.
>
>  03-12_16-31-00_Sky%20News_Sky%20News%20-%2030.ts<http://bbchd.s3.amazonaws.com/03-12_16-31-00_Sky%20News_Sky%20News%20-%2030.ts>
>
>
> So, the first one you posted which is  arecording from MythTV is a
> Transport Stream file that contains a single SD program split as:
>
> 0x0200 MPEG-2 Video for program 1
> 0x0280 MPEG-2 Audio for program 1
> 0x0240 Teletext/VBI for program 1
> 0x0c08 ISO/IEC 13818-1 private_sections for program 1
> 0x0c09 ISO/IEC 13818-1 private_sections for program 1
> 0x0905 ISO/IEC 13818-1 private_sections for program 1
> 0x0902 ISO/IEC 13818-1 private_sections for program 1
> 0x0906 ISO/IEC 13818-1 private_sections for program 1
> 0x0404 ISO/IEC 13818-1 private_sections for program 1
> 0x1ffe MPEG-2 PCR for program 1
> 0x0100 MPEG-2 PMT for program 1
> 0x0000 MPEG-2 Program Assocation Table
>
> Video at 2.7Mbits/sec, audio at 200kbits/sec, teletext at 75kbits/sec. The
> private sections (i.e. data associated with the service - I assume some
> form of MHEG apps and associated data in PIDs 0x0404, 0x0c09, 0x0c09,
> 0x0902->06) is 1.8Mbit/sec.
>
> The second file (the one you link to above) is a transport stream file
> containing the following:
>
> 0x0200 MPEG-2 Video for program 4704
> 0x0280 MPEG-2 Audio for program 4704
> 0x0240 Teletext/VBI for program 4704
> 0x1ffe MPEG-2 PCR for program 4704
> 0x0000 MPEG-2 Program Assocation Table
> 0x0100 MPEG-2 PMT for program 4704
>
> Video is at 2.47Mbit/sec, audio at 200kbits/sec, teletext at 75kbits/sec
> and the others are systems tables that use nearly nothing.
>
> The reason you have bigger files from MythTV is that it's capturing the
> associated data streams when compared to DVBViewer. Technically, this is
> correct as they will be marked as belonging to the program in the mux.
>
> HTH
>
> Andy
>
>
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>
> Thanks Andy,

So any theories why MythTV doesn't capture the Teletext subtitles as
reliably as DVBViewer despite the bigger file size?
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