After Effects export through Media Encoder restricts bitrate issue

[Stile]

I have strange issue. When exporting After Effects composition through Media Encoder into H.264 format, I set target bitrate VBR to 40Mbps. I even tried all possible combinations and I tried CBR to 50Mbps but final encoded H.264 video clip is always up to 12Mbps. Why?

If I export from AE to lossless MOV and import that MOV (as standalone) into Media Encoder, with same settings I get H.264 output at 50Mbps.

If I export anything from Premiere through Media Encoder, with same setting I am getting final H.264 with 50Mbps.

I have only issue exporting from After Effects through Media Encoder where I cannot get output with higher bitrate than cca. 12Mbps although in Media Encoder it is set to CBR 50Mbps.

Please, help... I am using CC 2019.

Here are settings from AME and final rendered video properties from After Effects through AME.

https://ibb.co/RPTK752

https://ibb.co/H4pDTwh

https://ibb.co/fHvdhjk

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[LigH.de]

Most probably, the video encoder decided that even with the best quality = smalles quantization factor, this material does not need more than the achieved bitrate for perfect representation. The only way to approach a higher target bitrate would be to stuff the result with unused fill bytes. This is called "encoder saturation". Some applications do the stuffing, others don't. You can probably reveal that by using a thorough bitrate viewer.

[Stile]

Thanks for reply, although I am not sure if AME is working in such way. But explanation is logical.

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