Le lundi 30 novembre 2020 à 11:10 -0800, Fritz Koenig a écrit : > When can bitrate, etc., be changed by VIDIOC_TRY_EXT_CTRLS? Any time > during encode? Only before VIDIOC_STREAMON? > > My understanding is that VIDIOC_STREAMON should start actually > processing frames, everything before then is configuration. If > something needs to be adjusted then VIDIOC_STREAMOFF should be called, > changes made, and then VIDIOC_STREAMON again. Is this correct? Bitrate is paticular is expected to be changeable at runtime (in STREAMON state). But a firmware may not support it, hence a driver is allowed to return EBUSY (iirc). Changing the bitrate without producing a new keyframe (whath cycling STREAMOFF/ON would cause) is a highly common use case while encoding for live streaming. This of course should be documented. > > I didn't see anything in the documentation about this. > > Thanks. > > -Fritz
