I am converting from DV to MPEG-2 at 480x480 resolution. Since I am storing files on hard disk I am trying for the smallest file size with no visable quality loss. I thought everything was fine until I did my first full length movie. In sceens where there is mild motion the picture slightly skips once in a while as if frames are dropped. There were no dropped frames during capture.
I am using CQ at a bitrate of 2600 and a quality of 65. I wonder if the bitrate is too low.
I also wonder about the GOP structure. I am using 1,5,2 with a max of 18 frames per GOP so it looks like IBBPBBPBBPBBPBBPBB I (open).
Any suggestions? My first thought is to increase the bitrate to 2800-3000.
Thanks
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I am still trying to get the parameters just right. I re-encoded at a max bitrate of 3000. I appears to have either reduced or eliminated the drop frame effect. Ther are now areas where I am not sure if I am seeing dropped frames. they may be less or it may be my imagination.
The file size is still quite small. For about a 1 1/2 hour movie:
2600: 817 MB
3000: 825 MB
Still hoping for some help.
Thanks -
Originally Posted by neo
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Originally Posted by FOO
I do not know why someone said the minimum should be 1200 but this makes a huges difference in file size. It just seems to increase the BR where it is not needed.
I may try an even higher BR at CQ.
Thanks -
Originally Posted by neo
If you want to mess with different GOP structures and other encoding methods for minimising filesize whilst maintaining quality, take a look at some of the TmpGenc templates on www.kvcd.net -
Originally Posted by bugster
Thanks, I really could not figure this site out.
I increased the Max BR to 3400 and again the increase in file size was not that great. I have not tried to watch it yet but filesize was 830 MB. -
raise your cq to at least 70 to get better encoding.Mind you the file size will increase but that will give you better results than increasing the bitrate.
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