HEVC b-frame nvenc in ffmpeg / nvidia encoder / nvencc (rigaya) on GTX 1660

[ReinerSchweinlin]

I did some tests with staxrip (nvencc), A`s Video Encoder and dmmedia encoder (ffmpeg) with a GTX 1660.

Especially whether b-frames with HEVC where used or not was my concern. I found:

nvencc - b- frames are present
A´s Video Encoder - no bframes
ffmpeg - no bframes.

Acording to the nvidia SDK Documentation and the encode matrix at the dev-forum, a GTX 1660 has the same encoder as the RTX20 Cards and supports b-frames.

I talked to bluesky about the issue and got the answer that "the nvidia encoder doesn´t support b-frames (on 1660)...

Ma knowledge is limited... My thinking was: the encoder is backed into the hardware and there is one way to call it (via the sdk)... nvencc just added some stuff like avisynth input, some cuda filters, etc...

Can someone shead some light on this?

[Balling]

B-frames were broken in for a long time and still broken in ffmpeg in some configs. See: https://trac.ffmpeg.org/ticket/8948#comment:6 and https://trac.ffmpeg.org/ticket/9351#comment:36

[ReinerSchweinlin]

Thanx for that info.

With nvencc from rigaya b-frame seem to work properly - so my assumption is he fixed something or is using a different approach than simply taking the ffmpeg from nvidia. Seems I have to stick with staxrip for the moment, it works fine here at the moment.