Question about DIVA settings

[LABachlr]

I read the tutorial here:

http://appleguru.home.comcast.net/dvdrip.html

It was a great tutorial, but it failed to mention what to set the "Final Size" to in the video bitrate calculator. Should it be left at 700MB?

I kept it at 700MB, and entered the other settings, and came out with a suggested video bitrate of 1935 kiloBytes/sec. Is that normal?

Settings inputed into video bitrate calculator:

Final Size: 700MB
Length: 00hh 06mm 08ss
Audio Bitrate: 96 kiloBits/sec

It's converting right now, and its average bitrate is 1131 KB/sec., and its Encoding Speed is 7.3 fps (0.24X). Shouldn't it be converting at 29.9 fps?

It actually just finished encoding, and it's a bit choppy. Also, its file size is 387MB.

What do I need to change?

My goal is to get this into a .mov file that can stream from the Net.

Thanks.

[alph]

I'm a bit unclear on what type of movie you are starting from and what your end purpose is, so forgive me if I add a little un-requested info here.

I'm assuming you've riped something from a dvd, you've already de-muxed your vob, that you know how to get the audio into quicktime since Diva does not do sound, and that you'll do a final encode with quicktime for streaming.

Bitrate and the level of compression are linked in that the less data you allow the compressor to store, the higher the compression level has to be to make sure the total data size is not exceeded. What this means is that if your bitrate is too high, which i think the case is here, very little compression is being applied and your movie ending up at 387MB is a result of there not being enough data to being with to create a movie of 700 megs. You could probably drop your bitrate to 1131 or so and get a movie of about the same final file size and quality as you are getting at 1935. Frame size plays a role in this too but you don't mention that.

For example: a 720 by 480 pixel movie at 29.97 frame per second with a run time of 7 minutes, you put your at 6:08mins, would require an optimal bitrate of about 2300 kb/s and this would generate a file of about 120 megs using an mpeg4 encoder.

The bitrate calculator sets 700megs as final size because many people like trying to fit a movie on a single CD which is 700 megs in size

When Diva says it's encoding at 7.3fps it means that it is the speed at which is it processing the frames of the movie you have it converting, your computer speed has an impact on this, and, therefore, this has no impact on the framerate of the movie it will produce. If you had a faster computer this number would be higher and lower if you had a slower computer.

Given what you are trying to do you're better looking at this in terms of bitrate to maintain quality at a given framerate and image size than shooting for a final file size.

For streaming you should be looking at making this movie 640 by 480 at the most with a framerate of about 15fps and a total bitrate of about 300kbps (kilo bits per second) for high-speed internet. 300kps total means that if you want sound to take up 96kbps then your video bitrate needs to be around 200kbps. To achieve decent quality, not too much blockyness, you might need to bring the frame size down to 320 by 240.

I hope at least some of this helps.

Cheers

[LABachlr]

Cool. Thanks.