![]() ![]() NVEnc has an actual 'Constant Quality' mode equivalent to CRF (by setting 'rc=vbr' and 'cq' instead of 'qp' - note also, it seems to necessary to set 'qmin' and 'qmax' to the same 'cq' value otherwise the quality setting isn't properly adhered to - at least, that is the case when using ffmpeg.) ![]() However, Constant QP 'constqp' is not the same as Constant Quality / CRF. B-frames are not the same as Reference Frames.When NVEnc is selected as the video codec, the UI quality setting says "Constant Quality: xx QP", which sets 'rc=constqp' - a setting for the "Quantization Parameter". NVENC allows 7 Reference frames and 5 B-frames. There is no reference frame option in Avidemux, Avidemux have only B-frame option. Regarding to NVENC, all famous encoders (Staxrip, Hybrid etc.) provide ref frame option and b frame options. I have never seen such low bitrate restriction in any other transcoder softwares. ![]() In 4K resolution, 100 MBit HEVC is sufficient for 25/30 Fps but for studio quality you need minimum 200Mbit/s for 50/60P video. If a cameraman record in 1080p under 50Mbit/s, than she/he will be fired from the TV company, because it is under the standard. If you are a cameraman of TV company, they ask you to provide them the simple 1080p material in 50Mbit/s, when you handle the video to the studio. Regarding hevc_nvenc FFmpeg encoder Avidemux wraps in its NVENC encoder plugin, it supports three reference frame modes for B-frames (none, each and middle) and Avidemux exposes all of them in the current NVENC HEVC encoder configuration GUI.ĥ0 Mbit/s is minimum for broadcast standard in HD 1080p. Quote from: eumagga0x2a on April 28, 2022, 03:33:57 PMAre you sure you have tried the latest available nightly build? Sure, the maximum bitrate for NVENC encoders wasn't increased (both and suggest that 50.000 kbps should be sufficient for fps and Main profile), but the point is that one should use CQP rather than specifying bitrate. ![]()
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