![]() ![]() ![]() ![]() ffmpeg's h264 -g (gop size) is rejected by linux (it is an urban myth that it works). h264 rate control mode VBR perhaps "should" allow setting of "peak_bitrate" per the spec, unless I misunderstand it and instead qp_min/qp_max applies, however linux rejects setting "peak_bitrate"ħ. Encoder v4l2_m2m ERROR VIDIOC_STREAMON failed on output contextĦ. Encoder v4l2_m2m v4l2_receive_packet ERROR VIDIOC_STREAMON failed on output context ret=(-3) errno=(3 'No such process') h264 rate control mode allows VBR and CBR which are both settable, however CBR causes the ffmpeg encoder to abort when starting (with added debug code): h264 b-frames are not settable not supported by linux (no code to handle it anyway)ĥ. only a restricted set of -levels are accepted by linux but ffmpeg allows any levelĤ. only a restricted set of -profiles are accepted by linux but ffmpeg allows any profile (eg re h264 see v4l2-ctl -all -d 11 or v4l2-ctl -list-ctrls-menu -d 11)ģ. the ffmpeg -profile option only accepts an integer and rejects "-profile high"Ģ. I assume it's the linux OS enforcing limits on encoder options when I patch ffmpeg attempting apply nice-sounding options.Ĭurrent perceived issues and limitations,ġ. There's some minor issues and a few urban myths about what options ffmpeg's v4l2m2m encoders accept and use, as well as some limitations. 1058120137Īnd a relevant generic spec is at. I am tinkering with patching ffmpeg code for v4l2m2m encoder options ffmpeg v4l2m2m encoders use the Pi's hardware.īeing lazy, and a 1970s vintage non-linux programmer, I would value advice/pointers (i.e. ![]()
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