[mythtv-users] Live TV recording file size double size of DVBViewer on Windows 7?

[Raymond Wagner]

On 3/12/2012 10:51, David Crawford wrote:
> Below is the mediainfo of the exact same program recorded on both, its 
> seems that the Bits/(Pixel*Frame) is where the difference lies.

Huh?  BPP is just an arbitrary value computed by MediaInfo.  You take 
your average bitrate, divide by the framerate, and the frame size.  Its 
simple math.

4081000 / (25 * 704 * 576) = 0.40256
2360000 / (25 * 704 * 576) = 0.23280

It's a simple measure of compression level.  The raw video would be 
12bpp.  0.4 is fairly average for MPEG2, while 0.23 is rather poor 
quality.  Typically H264 gets used if you need to drop that low.  Of 
course relative motion between frames, scene complexity, and noise 
levels can cause good levels of this value to swing wildly in both 
directions.

MythTV records the video as it comes from the broadcaster.  If it's 
storing 4Mbps, the broadcaster is sending 4Mbps.  Are you sure you're 
actually comparing videos from the same channel?