Zarxrax
7th March 2002, 17:55
Ok, we've all heard the reports of how divx5 is like 30% better and all, but I've done some tests here, and I think the results are astoinding! As I've mentioned in another thread, I've done some test encodes using anime, and the divx5 encodes only come out at similar quality as my sbc encodes. Well, here are some facts that support it!
I tested a 2 minute long clip from an anime with little motion. In divx5 I used constant quality to keep the drf at a constant level, and in nandub I set bitrate to 6000, freeze to 100, and locked the drfs to same levels that I tested in divx5.
DivX 5, no mpeg-4 options enabled:
DRF 2: 11.0MB
DRF 4: 6.17MB
DRF 16: 2.85MB
DivX 5, B-frames and GMC enabled:
DRF 2: 9.90MB
DRF 4: 5.68MB
DRF 16: 2.38MB
DivX 3
DRF 2: 9.65MB
DRF 4: 4.83MB
DRF 16: 1.63MB
Now, I have checked the divx encodes to see that they used the proper drf levels throughout, and indeed they did. Now what we see here, is DivX 5, Is much larger than Divx3 at the same DRFs! Only by enabling the new mpeg-4 features does it approach the filesize of the divx3 encode!
Now, as I mentioned, these tests were done on a clip with little motion. I also performed a small test on a 20 second clip with lots of motion, and in those tests the filesize of the divx3 turned out somewhere inbetween the 2 divx5 encodes.
I find this test results to be very interesting and shows that Divx5 may not compress better than Divx3 at all! I would love if some others could test this a bit more. I'd also be interested in comparisons to Divx 4 and Xvid as well.
I tested a 2 minute long clip from an anime with little motion. In divx5 I used constant quality to keep the drf at a constant level, and in nandub I set bitrate to 6000, freeze to 100, and locked the drfs to same levels that I tested in divx5.
DivX 5, no mpeg-4 options enabled:
DRF 2: 11.0MB
DRF 4: 6.17MB
DRF 16: 2.85MB
DivX 5, B-frames and GMC enabled:
DRF 2: 9.90MB
DRF 4: 5.68MB
DRF 16: 2.38MB
DivX 3
DRF 2: 9.65MB
DRF 4: 4.83MB
DRF 16: 1.63MB
Now, I have checked the divx encodes to see that they used the proper drf levels throughout, and indeed they did. Now what we see here, is DivX 5, Is much larger than Divx3 at the same DRFs! Only by enabling the new mpeg-4 features does it approach the filesize of the divx3 encode!
Now, as I mentioned, these tests were done on a clip with little motion. I also performed a small test on a 20 second clip with lots of motion, and in those tests the filesize of the divx3 turned out somewhere inbetween the 2 divx5 encodes.
I find this test results to be very interesting and shows that Divx5 may not compress better than Divx3 at all! I would love if some others could test this a bit more. I'd also be interested in comparisons to Divx 4 and Xvid as well.