Question / Help AMD H264 Encoder Question.

[Orvis25]

Can someone please explain what the min/max QP is and how it effects the quality of the video? I can not find any info on it other than some super complicated article explaining formulas it uses to adjust bit rate consistency.

Thanks!

 

[Suslik V]

This depends on where you are find this QPs.

 

[Orvis25]

This depends on where you are find this QPs.

under settings->output-> H264 Encoder (AMD Advanced Media Framework) -> Export view mode -> Min/max QP settings are there

 

[Boildown]

For x264, you don't want to mess with those. For the AMD H.264, its probably the same way.

 

[Suslik V]

What field?

Minimum QP

Lowest QP value to use in a Frame.​

Minimum I-Frame QP

Lowest QP value to use in an I-Frame.​

Minimum P-Frame QP

Lowest QP value to use in a P-Frame.​

Maximum QP

Highest QP value to use in a Frame.​

Maximum I-Frame QP

Highest QP value to use in an I-Frame.​

Maximum P-Frame QP

Highest QP value to use in a P-Frame.​

QP is abbreviation for Quantization Parameter. Lower QP - less compression (higher bitrate requirements) and lower compression artifacts (higher quality).

And View Mode: Expert not recommended. Switch back to Basic.

 

[Orvis25]

What field?



QP is abbreviation for Quantization Parameter. Lower QP - less compression (higher bitrate requirements) and lower compression artifacts (higher quality).

And View Mode: Expert not recommended. Switch back to Basic.

So why would I not just turn my QP low to a higher number and get better compression? Will it negatively affect my quality?

I have low @ 20, and high @ 51.

This is what it looks like for me @ 5,100 bitrate.
https://www.youtube.com/watch?v=P0xJyIGy0fg

 

[Xaymar]

Can someone please explain what the min/max QP is and how it effects the quality of the video? I can not find any info on it other than some super complicated article explaining formulas it uses to adjust bit rate consistency.

Thanks!

You can hover over the setting to see what it is for - this is a feature in OBS that is used everywhere in the AMD encoder plugin.

Minimum and Maximum QP merely restrict the range that the QP can be in a frame. The default is 18 - 51 and this is the one that by far brings the best quality per bit. Increasing the minimum to 20 will actually make things worse and most of your bitstream will just be Filler Data.