Changing maxrate did not work for me.īefore implementing a workaround someone should take a look at ffmpeg's source code or ask someone over there why the following command lines result in totally different bitrates in a constant quality bitrate mode which should not require setting a bitrate at all.
100Mbit/s will allow NVEnc's cq to use even higher bitrates as would be approriate for a cq of 1 or 10. Setting the bitrate to zero as Handbrake does seemed to work fine regarding unlocking the bitrate but scav666 is right: Setting the bitrate to e.g. In any case 2000kbit/s is the bitrate limit. If the user or in this case Handbrake does not define another bitrate it seems as if cq is ignored altogether. cq E.V.As I wrote in #2392 ffmpeg's default encoding bitrate when using NVEnc is around 2000kbit/s independently of the source (tried with 1080p and 4k). AQ strength scale is from 1 (low) - 15 (aggressive) (from 1 to 15) (default 8)
When Spatial AQ is enabled, this field is used to specify AQ strength. Set 1 to minimize GOP-to-GOP rate fluctuations (default false) Set this to 1 to enable automatic insertion of non-reference P-frames (default false) Set 1 to indicate zero latency operation (no reordering delay) (default false) set to 1 to enable Spatial AQ (default false) If forcing keyframes, force them as IDR frames. When lookahead is enabled, set this to 1 to disable adaptive I-frame insertion at scene cuts (default false) Delay frame output by the given amount of frames (from 0 to INT_MAX) (default INT_MAX) (from -2 to INT_MAX) (default any)Īny E.V. Number of concurrent surfaces (from 0 to INT_MAX) (default 32) Number of frames to look ahead for rate-control (from -1 to INT_MAX) (default -1) Multi-pass optimized for constant frame size (only for low-latency presets) Multi-pass optimized for image quality (only for low-latency presets) Override the preset rate-control (from -1 to INT_MAX) (default -1) Set the encoding tier (from 0 to 1) (default main) Set the encoding level restriction (from 0 to 186) (default auto)
Set the encoding profile (from 0 to 4) (default main) Set the encoding preset (from 0 to 11) (default medium) Supported pixel formats: yuv420p nv12 p010le yuv444p yuv444p16le bgr0 rgb0
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