Bitrate vs Size Calculator for x264 for ripping DVD to x264 + AC3

[Bonie81]

How to calculate or limit final rip size precisely (like XViD codec) for DVD while ripping DVD to x264 + AC3?

[jagabo]

universal to all codecs:

file size = bitrate * running time

So any bitrate calculator will work regardless of what codecs you are using. Each container has a bit of overhead too. But that's on the order of 1 percent.

[greymalkin]

remember 8 bits = 1byte...so 8Mbps = 1 MBps

sooooo... (bitrate<in Mbps> / 8 ) = MB per second
once you have your total MB's required divide by 1024 to get the number of GB's.

[redwudz]

The VideoHelp Bitrate calculator is easy to use. It has a Xvid module which is close enough to H.264.

Most times it requires a two pass encode to set a specific filesize.

FYI, most times 'ripping' refers only to the process of making a exact copy of the disc on your hard drive.
Changing the format to H.264 is encoding. Just to limit confusion.

[Bonie81]

thanks for the responses!

file size = bitrate * running time
remember 8 bits = 1byte...so 8Mbps = 1 MBps

The VideoHelp Bitrate calculator is easy to use.
yeah, it's pretty easy which gives rough idea for x264 (hope, should be close to xvid)

after two or three conversion, i might be finalize video and audio bitrate for good quality, plus i gonna know exact difference betwen calculated and actual.

Thanks!

[jagabo]

There will only be a small difference in file size between Xvid and x264 at the same bitrate. Because of the slight difference in container overhead (AVI vs MKV or MP4).

[Bonie81]

The VideoHelp Bitrate calculator is easy to use. It has a Xvid module which is close enough to H.264.

Most times it requires a two pass encode to set a specific filesize.

Yeah, filesizes for XViD and x264 are pretty close to calculated one, only difference is...
1) XViD file size little less than calculated while x264 is little higher than calculated, but pretty close.
2) Bit rate is definitely higher in x264 than XViD.

Thank you, I mean all of you for valuable inputs.

[RabidDog]

The Bitrate is what you set it to..?? x254 s a more efficient encoder than xvid, meaning you can obtain better quality at the same bitrate