Yeah, I thought of that myself, but it doesn’t seem to work. Here are the relevant lines from the log:
[hevc_qsv @ 000001b13a86d040] Initialized an internal MFX session using hardware accelerated implementation
[hevc_qsv @ 000001b13a86d040] Using the constant quantization parameter (CQP) ratecontrol method
[hevc_qsv @ 000001b13a86d040] profile: simple; level: 30
[hevc_qsv @ 000001b13a86d040] GopPicSize: 150; GopRefDist: 4; GopOptFlag: closed ; IdrInterval: 1
[hevc_qsv @ 000001b13a86d040] TargetUsage: 4; RateControlMethod: CQP
[hevc_qsv @ 000001b13a86d040] QPI: 12; QPP: 16; QPB: 21
[hevc_qsv @ 000001b13a86d040] NumSlice: 1; NumRefFrame: 3
[hevc_qsv @ 000001b13a86d040] RateDistortionOpt: unknown
[hevc_qsv @ 000001b13a86d040] NumTileColumns: 1; NumTileRows: 1
[hevc_qsv @ 000001b13a86d040] RecoveryPointSEI: unknown IntRefType: 0; IntRefCycleSize: 0; IntRefQPDelta: 0
[hevc_qsv @ 000001b13a86d040] MaxFrameSize: 0; MaxSliceSize: 0;
[hevc_qsv @ 000001b13a86d040] BitrateLimit: unknown; MBBRC: OFF; ExtBRC: OFF