I need help with x264

[dedomedooo]

Hi everyone I need help with VBV I want to know how to know the VBV buffer size and VBV maxrate. I want to know how to calculate them and I want to know the keyint and the minkeyint and to know qcomp please help.

[LoRd_MuldeR]

You don't "calculate" the VBV maxrate/buffsize. They are defined by your target playback device.

You'll have to look them up in the documentation/manual. If the info is missing, which is more often the case than not, you might find the info on the net ;)

For BluRay authoring, the standard defines the VBV parameters (details (https://sites.google.com/site/x264bluray/)). Also note that for software players VBV usually doesn't matter at all...


Keyframe intervals are a completely different topic!

Basically "--keyint" is the maximum distance between two consecutive keyframes, and "--min-keyint" is the minimum distance between two consecutive keyframes.

Allowing larger keyframe intervals usually improves compression, but comes at the cost of slower seeking...

[dedomedooo]

ok and how I'll know VBV maxrate/buffsize can I found them with mediainfo or with another tool ?

[LoRd_MuldeR]

If you have an existing video file that was encoded with x264, then MediaInfo can show the VBV parameters that were used.

But: This will tell you absolutely nothing about the VBV parameters that are required to make a video play smoothly on your playback device...