High/low/typical Bitrates

[Harrysmiith]

Have just successfully backed up a movie which showed a reduction level of 57.2% and high/low/typical bitrates of 4557, 4550, 4551

This is the first time I have seen such similar figures. According to Bitrate viewer
the original has figures of peak 8820 average 7660. the quant graph goes up and done quite a bit but the yellow bitrate graph moves within a very narrow range.

Is this as unusual as I think it is ?

[Rockas]

looks like a CBR (or close to it) encoding :)

[jdobbs]

I'm going to have to do something to make processing of CBR better. It's just so damned unusual that I've ignored it up until now.

[jdobbs]

Looking at the characteristics you've mentioned you're not seeing CBR (on CBR the bitrate line is flat) -- but it is a limited context VBR of some sort. You see that a lot on things that are encoded on the fly, like live television. You also see it on settop dvd player/recorders. In those circumstances the output bitrate is going to be close across segments because of the way it was recorded.

On those you would normally see very little quality loss in reencoding because there is so much wasted bandwidth on the original...

[Harrysmiith]

Thanks for the replies. If it helps the movie is Shane (PAL Region 2) and given the age of the material - originally made in 1952 ? it looks fine. My interest was simply that I had not previously seen anything so flat.