<br><br><div class="gmail_quote">On 12 March 2012 17:23, Andy Sheen <span dir="ltr"><<a href="mailto:sheen.andy@googlemail.com">sheen.andy@googlemail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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David Crawford wrote on Mon 12 Mar at 17:09 UK time
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Here's a link to .ts file from DVBviewer. Hardly any noticeable
difference in quality.
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<div><a href="http://bbchd.s3.amazonaws.com/03-12_16-31-00_Sky%20News_Sky%20News%20-%2030.ts" target="_blank">03-12_16-31-00_Sky%20News_Sky%20News%20-%2030.ts</a><br>
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So, the first one you posted which is arecording from MythTV is a
Transport Stream file that contains a single SD program split as:<br>
<br>
0x0200 MPEG-2 Video for program 1<br>
0x0280 MPEG-2 Audio for program 1<br>
0x0240 Teletext/VBI for program 1<br>
0x0c08 ISO/IEC 13818-1 private_sections for program 1<br>
0x0c09 ISO/IEC 13818-1 private_sections for program 1<br>
0x0905 ISO/IEC 13818-1 private_sections for program 1<br>
0x0902 ISO/IEC 13818-1 private_sections for program 1<br>
0x0906 ISO/IEC 13818-1 private_sections for program 1<br>
0x0404 ISO/IEC 13818-1 private_sections for program 1<br>
0x1ffe MPEG-2 PCR for program 1<br>
0x0100 MPEG-2 PMT for program 1<br>
0x0000 MPEG-2 Program Assocation Table<br>
<br>
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.<br>
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The second file (the one you link to above) is a transport stream
file containing the following:<br>
<br>
0x0200 MPEG-2 Video for program 4704<br>
0x0280 MPEG-2 Audio for program 4704<br>
0x0240 Teletext/VBI for program 4704<br>
0x1ffe MPEG-2 PCR for program 4704<br>
0x0000 MPEG-2 Program Assocation Table<br>
0x0100 MPEG-2 PMT for program 4704<br>
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Video is at 2.47Mbit/sec, audio at 200kbits/sec, teletext at
75kbits/sec and the others are systems tables that use nearly
nothing.<br>
<br>
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.<br>
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HTH<span class="HOEnZb"><font color="#888888"><br>
<br>
Andy<br>
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<br></blockquote></div>Thanks Andy,<div><br></div><div>So any theories why MythTV doesn't capture the Teletext subtitles as reliably as DVBViewer despite the bigger file size?</div>