small test with DivX 5 Tahanea

[Sagittaire]

Test in quality mode 100%


Standard ........................... 88 430 Ko
Standard+bframe .................... 73 932 Ko DivX Pro 5.05
Standard+GMC ....................... 88 646 Ko
Standard+QPel ...................... 87 760 Ko
Standard+Full Search ............... 87 960 Ko Very too slow

Standard ........................... 88 430 Ko
Slow ............................... 83 436 Ko
Slowest ............................ 83 304 Ko Too slow ... !!!

Slow+bframe+Qpel ................... 74 890 Ko Bug ... !!!!
Slow+bframe+GMC .................... 70 026 Ko
Slow+bframe ........................ 69 838 Ko


For best quality in NPass for usual condition encoding with my test

Mode 3 Pass ( bad quality with mode 2 Pass .... ???!!! bug )
Slow+bframe
Profil Home Theater

[Sirber]

Which one is the best, DIVX5 or Tahanea, for best quality at smaller filesize?

[Sagittaire]

It is a very subjective concept quality ...!

But the PSNR is better for DivX 5 Tahanea

[BoNz1]

@ Sirber, Tahanea is just for testing, please note that there are some bugs, http://forums.divx.com/viewtopic.php?topic=51051&forum=25 probably a rate-distortion agorithim will find its way into a future release though. But for now use 5.05 for regular encodes. I think the full search might never make it into a newer version of the codec see this, http://forums.divx.com/viewtopic.php?topic=50746&forum=25 so this is the reason why full search was so slow for you. For the best combination of speed and quality use slow or slowest, ;)

[XiS]

The motion search is the most important hot spot in a video encoder. Full search is the most CPU intensive and may increase your conversion time up to 3,4 to 100 times without having noticeable quality.
One the most important quality improvement during encoding is the quantization. It decides the way the encoder distribute the bits in a frame. More the complexity of a block is big, the most the quantizer will allocate bits for him. The quality of the quantizer is one of the most important factor in an encoder.

Conclusion : Increase a little bit motion vector detection if you have a high motion film. Else, let it at its default position.