Filze size mpeg 2.

[randazzo]

I finished my project. All in DV1 and total playing time 58 minutes. When I rendered it my parameters were;

MPEG2
PAL (720x570)
quality 100%
Bitrate 9000 Variable.

MSP8 indicated that the estimated file size would be 3.8 Gb. After rendering the MPEG2 file was just 1.9 Gb large.

Anyone have a clue?

Regards,
Jean-Pierre

[Devil]

If your project has little movement, this would be quite normal, especially on single pass. However, it's not clever to allow a max bitrate of 9000 kbit/s, because a) many players cannot handle a high bitrate from DVD+/-R and b) DV compression artefacts prime over MPEG-2 artefacts at a limit of about 6000 kbit/s. If I'd been doing such a project, I'd have used 6000 or 6500 kbit/s CBR. As it is, I'd estimate your average bitrate is ~3700 kbit/s, so doing as I suggest will offer a considerable improvement with a file of ~3.1 Gb (assuming AC-3 audio at 192 kbit/s).

You see, when you start a VBR project, it cannot know in advance how much of it to encode at a high bit rate. It sees little movement, to start with, so it encodes at a low bitrate, assuming you will need a high bitrate later on. This continues for as long as you don't have F1 cars zooming past or lots of transitions, when it will up the bitrate to maximum, consistent with keeping under the set average. The estimated file size is based on the average which, in your case, would not appear to be reached.

[randazzo]

So I guessed the quality was high by choossing a high bit-rate but instead I reached the opposite?

It was indeed a video with few movement (wedding). So It's wiser for me to choose for 6500 CBR in the future.

I'll try that next time. Thanks for your reply Devil.

Regards,
Jean-Pierre