Tversity Bitrate and File Size

820 Views 2 Replies 3 Participants Last post by bobnielsen, Sep 30, 2008

johnbrain

Discussion Starter · Sep 30, 2008

Hi Folks,

I am somewhat new to the whole AVI encoding game but here's my question. I encoded a DVD Ii have about a young wizard with avi.net based on 2gb file size. The worked out to 1700kbps bitrate and it just looks okay.

I also encoded an animated movie about some animals just over the bushes from suburbia. I based it on file size of 1.5gb which then worked out to about 2300kbps. Prior to this I didn't know what that meant, but the picture quality is significantly better.. but the movie is one hour shorter.

If I encode a 2 - 2.5 hour movie basing it on bitrate, I will have a much larger file size than say 2gb. That issue alone does not bother me, but I was wondering if there's something I am missing here, or is the higher bitrate resposnible for the higher streaming avi quality?

Thanks.

B

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Bushwacr

· #2 · Sep 30, 2008

johnbrain said:
Hi Folks,

I am somewhat new to the whole AVI encoding game but here's my question. I encoded a DVD Ii have about a young wizard with avi.net based on 2gb file size. The worked out to 1700kbps bitrate and it just looks okay.

I also encoded an animated movie about some animals just over the bushes from suburbia. I based it on file size of 1.5gb which then worked out to about 2300kbps. Prior to this I didn't know what that meant, but the picture quality is significantly better.. but the movie is one hour shorter.

If I encode a 2 - 2.5 hour movie basing it on bitrate, I will have a much larger file size than say 2gb. That issue alone does not bother me, but I was wondering if there's something I am missing here, or is the higher bitrate resposnible for the higher streaming avi quality?

Thanks.

B

In general, a higher bitrate leads to better quality all else being equal. It's also more work for a processor and may lead to buffer problems.

It's easy to test; take a movie and change the br for that movie and see the results. It's not a good test to compare different movies at different bitrates.

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bobnielsen

· #3 · Sep 30, 2008

You don't want to go too high with the bitrate, as the HR2x won' t handle more than ~6-8 Mbps and the video may drop out after several seconds. It has improved slightly recently, but still is a problem.

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