Le nonidi 9 vendémiaire, an CCXXV, Marton Balint a écrit : > Alsa dev and v4l2 seem to work this way regardless if non blocking mode is > set or not,
After a quick glance, no, they do not, at least provided the kernel and system libraries keep the same promise (which, AFAIK, they do). > and ffmpeg.c also waits if it encounters AVERROR(EAGAIN) in > av_read_frame. It should not have to, but for a long time the demuxers were opened in non-blocking mode, I suppose the code was not updated when it was changed. > So AVERROR(EAGAIN) return value seems to be consistent with > existing code, which assumes that if EAGAIN is returned from av_read_frame, > wait a bit. > > If what you wrote is the way to move forward, then at least send a > documentation patch, to establish this av_read_frame return value behaviour. I will consider doing that when time permit. But the behaviour is directly copied from the Unix behaviour. Regards, -- Nicolas George
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