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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'> mythtv-users-bounces@mythtv.org
[mailto:mythtv-users-bounces@mythtv.org] <b>On Behalf Of </b>Raymond Wagner<br>
<b>Sent:</b> Wednesday, May 19, 2010 9:23 AM<br>
<b>To:</b> Discussion about mythtv<br>
<b>Subject:</b> Re: [mythtv-users] MythTv 0.23 recording resolution and
playback issues<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>On 5/19/2010 08:18, Ebsen, Mike P. wrote: <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>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.<o:p></o:p></span></p>
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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>
<br>
<o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>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).<o:p></o:p></span></p>
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<p class=MsoNormal><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>
<br>
<o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>
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.<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><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.<o:p></o:p></p>
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