<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jun 8, 2015 at 10:22 AM, Gary Buhrmaster <span dir="ltr"><<a href="mailto:gary.buhrmaster@gmail.com" target="_blank">gary.buhrmaster@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Sun, Jun 7, 2015 at 9:50 PM, david brooke <<a href="mailto:david2012brooke@gmail.com">david2012brooke@gmail.com</a>> wrote:<br>
.....<br>
<span class="">> Has anyone asked about the quality of the mpeg4? Depending on the video bit<br>
> rate, etc...the quality can be effected.<br>
<br>
</span>As one might expect, Comcast is not committing to anything<br>
(just as they never committed to anything IRT MPEG2 quality).<br>
Reports from the test market (Augusta) were minimal, and<br>
anecdotal in nature. My WAG is that the quality will be<br>
targeted as being very slightly better to avoid people being<br>
able to blame Comcast for turning the picture to crap (due<br>
to this cut over), and to still get the maximum benefit (in<br>
bandwidth savings) from the changes. But as is well known,<br>
video "quality" has some subjective components, so I have<br>
no doubt some people will see the changes differently.<br>
<br>
If someone has the interest (Mr. Brooke?), and can find a<br>
MythTV user in Augusta, one might be able to get samples<br>
for (the same) content that is still broadcast in other markets<br>
in MPEG2, and do the comparison (for scientific studies<br>
only, no copyrighted material would be viewed for human<br>
consumption :-).<br></blockquote><div><br></div><div><br></div><div>As you have said, there are a lot of caveats and subjective elements, but I think experience has shown that the same quality should be achievable in approximately 50% of the bitrate.</div><div> </div><div>Of course there is nothing to stop comcast starting with a highish bitrate so that people are impressed by the new codec, then slowly ramping it down over time in the hope that no one notices.</div></div></div></div>