bur
3rd November 2011, 09:26
I have a lot of files to convert for mobile viewing. That means I don't need high quality and also exact file size isn't important. To save time I thought of trying 1pass encoding.
But I'm wondering how to choose the CQ factor. In a 2pass encoding quantizers from 1 to 3 were used for I-Frames and the range was even bigger for P-frames. And the resulting quality was as needed. So if I set the quantizer to 2 I'd loose quality in some frame and while wasting bitrate in others.
Is there any way around this or is it a general problem of constant quantizer mode that can only be solved by using constant quality/CRF as is possible in x264?
The thing is so far I'm stuck with using VirtualDub and hence probably Xvid due to this: see other post (http://forum.doom9.org/showthread.php?p=1536040#post1536040)
But I'm wondering how to choose the CQ factor. In a 2pass encoding quantizers from 1 to 3 were used for I-Frames and the range was even bigger for P-frames. And the resulting quality was as needed. So if I set the quantizer to 2 I'd loose quality in some frame and while wasting bitrate in others.
Is there any way around this or is it a general problem of constant quantizer mode that can only be solved by using constant quality/CRF as is possible in x264?
The thing is so far I'm stuck with using VirtualDub and hence probably Xvid due to this: see other post (http://forum.doom9.org/showthread.php?p=1536040#post1536040)