[opendtv] Re: Comparison of H.264 with MPEG-2
- From: "Donald Koeleman" <donald.koeleman@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 22 Sep 2005 15:46:32 +0200
At IBC I saw a few mpeg2 to avc transcoding demos, one was at 3.5 mbit/s
transcoding to 2.1, If I remember correctly the others were also using
simillar bitrates, and even a rather untrained eye such as mine could
clearly see the difference. The AVC image of lower quality, with more
clearly noticable blurring of the background and loss of contrast/detail in
the objects in focus as well.
Of course this is transcoding and not two seperate compression runs from a
clean high quality source.
Donald
----- Original Message -----
From: "John McClenny" <jamcclenny@xxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Wednesday, September 21, 2005 5:04 AM
Subject: [opendtv] Re: Comparison of H.264 with MPEG-2
Not at all scientific, but looking at first generation SD Realtime encoders
for H.264, 4 Mb/s MPEG-2 looks "about" the same as 2.5 Mb/s H.264. Yeah, I
don't have a trained eye - I know....
The expectation is that the encoder compression will improve rapidly as they
turn on more features once the software gets stable. "They" expect to be
down to about 1.8 or 1.9 Mb/s for the same quality in the next 9 months. I
think that is a litle aggressive.
HD is harder and the early stuff we are seeing is at 10 Mb/s. Not bad, but
not as good as the full bandwidth MPEG-2.
Again, I am a middleware guy, so what do I know about video :).
Doc McClenny
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