Questions on H264

[Kira7]

Have questions..

what means h.264 level 4.1 ? What does it do?

What does Processing 2 Pass do?

[Overdrive80]

http://en.wikipedia.org/wiki/H.264/MPEG-4_AVC

[microchip8]

http://en.wikipedia.org/wiki/H.264/MPEG-4_AVC#Levels

[LoRd_MuldeR]

What does Processing 2 Pass do?

A qualitative overview of x264's ratecontrol methods - by Loren Merritt (http://akuvian.org/src/x264/ratecontrol.txt)

[Kira7]

When i make PRocessing 2 Pass on, is the Audio or Video Quality better?

I dont want to know what h.264 level 4.1 mean, i want to know what happens when i make it on and muxe a movie :D

[Guest]

When i make PRocessing 2 Pass on, is the Audio or Video Quality better? Certainly not the audio, because you are talking about a video encoder. 2-pass encoding has some use cases where perceived quality is improved. Please tell us more about your specific use case and then we can advise you better.

I dont want to know what h.264 level 4.1 mean, i want to know what happens when i make it on and muxe a movie :D What happens is that you have made a stream that requires the player to be able to support 4.1 or greater. You can do some research to see what level is required by your target player.

[MeteorRain]

I dont want to know what h.264 level 4.1 mean
:scared: Did you ask this question at OP?

I want to know what happens when i make it on and muxe a movie :D
Generally speaking, if you encode a file under Level 5.1 specification, a player that can only handle level 4.1 may not be able to play this level 5.1 file, because it's somehow too difficult for the player to handle.
(Like, too large resolution, too much reference frames to store in a small memory, too high bitrate on a slow storage, etc.)

And if you use some mod version of x264 (as I'm not sure if vanilla comes with this), the level is automatically chosen to the minimum requirement to play this file.

So you may get a level 4.0 file even if you choose level 5.1, just because it's under level 4.0 specification, i.e. a level 4.0 player can handle this file without problem.