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On 5/19/2010 08:18, Ebsen, Mike P. wrote:
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<div>The 10.04 release seems to always record at 1920x1080 resolution
independent of the broadcaster’s source format. Old TV shows, like
Hogan’s Heros, that are still being broadcasted at a very grainy
548x480 are small fields of video information with large
black unused bands on top, bottom, left and right edges of the
1920x1080 *.mpg recorded file.</div>
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<br>
Your 2250 is a digital tuner. The recordings it makes are /exactly/
what is being broadcast. MythTV is not altering the stream in any
manner. If you plug in a QAM-capable TV, you will see the exact same
thing.<br>
<br>
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<div>Another detriment of the 10.04 resolution issue is recorded file
sizes. Recording the same program on the 9.10 and 10.04 with the same
quality setting (Normal) results in drastically different file sizes.
The older 9.10 release could record an old TV
show at a data rate of 780 MByte/half hour. The latest 10.04 release
records the same show at a rate of 3.3 GByte/half hour (and a whole
bunch of dark pixels surrounding the relatively small image in the
middle).</div>
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<br>
The quality settings on a digital tuner do absolutely nothing. MythTV
will store the stream exactly as it is received, and will do no
additional processing.<br>
<br>
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<div> I thought one of the attributes of the latest
10.04 release was the newest H.264 codecs that were both faster and
more efficient at video compression. My observations don’t align with
these assumptions.</div>
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<br>
MythTV does not use H.264 for video compression. It can only use MJPEG
and ASP, and then only for analog framegrabbers. The claim was that a
sync of the internal ffmpeg library prior to the release of 0.23
brought a better optimized H.264 video decompressor, that is roughly
15% faster than before. This is irrelevant because everything you ever
record off that 2250 will be MPEG2.<br>
<br>
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