Do Encoding with H264 using 2 passes actually improve the quality

[prithvi]

Friends i am useing handbrake to backup/convert my dvd files (vob) to MKV so directly i play it on my LG LEDtv via USB.



so here i have 2 quarry

1> Wat settings should i keep (constant quality as by the above pic) RF20 to15 or less then that.... do it really inc the quality as by default its on 20 and i change some time to 15 but i find rarelly any difference in the output.

and

2> when useng H.264 do i use 2 pass method...as its take lot of time :/ .. will it effect in the quality and what size it will be as i dont need more then 2gb output

[jagabo]

Use 2-pass mode when you need a specific file size (bitrate). Like when you need to fit a 2 hour movie on a 700 MB CD. You will get the best quality for that file size. Use constant quality encoding when you want to be assured of a specific quality and don't care about the file size.

If you encode a video at constant quality of 20 and it turns out with an average bitrate of 1000 kbps, then go and make a 2-pass encoding at 1000 kbps, the two videos will look nearly identical.

[prithvi]

hmm thatz means hardly any diff will come if i used 2pass or constant quality with same bitrate !

btw do u know any other tool like handbrake which can convert vob files to mKV

[yoda313]

ripbot264 for starters.

[prithvi]

so much of settings is there in that ripbot plus wherz mp3 or other audio settings in it.. az compare to handbrake

i have converted 5 min vid (a test video) size hardly 1 mb diff..
speed-- handbrake was little faster then ripbot...
quality-- damm no diff