QT CBR Mpeg encoder not constant?
by Adam Sondej on Jul 3, 2005 at 11:40:36 pm
When I encode 3x15 minute equal length Videos (different content in each) into Quicktime MPEG-2s using
One Pass (Constant Bit Rate) I get a 20 per cent
file size variation.
I expected to see equal file sizes.
The CBR mpegs are required by a multistream MPEG server.
PAL 8.0kbs One Pass CBR
Re: QT CBR Mpeg encoder not constant? by Roadkill on Jul 4, 2005 at 8:26:23 pm
AFAIK you won't be able to create the type of MPEG stream required by the server using Compressor. For DVD-Video purposes a CBR encoded MPEG file uses a more or less constant bit rate, as long as that bit rate is really required to encode the video. In easy to compress sections of the video (e.g. a still or near motionless video) the bit rate will drop below the bit rate set.
You will probably need an MPEG encoder that can create "transport streams" and which pads those low bit rate sections to keep the bit rate artificially constant.