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

[Andy Sheen]

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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