On 09/03/2017 02:27 AM, Mark Thompson wrote:
+ /* 0. subscribe to source change event */
+ memset(&sub, 0, sizeof(sub));
+ sub.type = V4L2_EVENT_SOURCE_CHANGE;
+ ret = ioctl(s->fd, VIDIOC_SUBSCRIBE_EVENT, &sub);
+ if ( ret < 0)
+ av_log(avctx, AV_LOG_WARNING, "decoding does not support resolution
change\n");
How fatal should that be? What happens if it changes anyway?
the buffers are allocated and queued in the driver with a size for a
resolution and format: if the resolution changes down-up the image will
not fit in the previously allocated buffers - not sure if that will
cause some drivers to generate bus errors....I guess it will depend on
each driver; also the sizes reported back with the frame after decoding
to ffmpeg will not have been fixed properly since we couldnt receive the
event so I doubt the images can be recomposed.
Basically the v4l2 kernel driver will have no way to report changes back
to ffmpeg...
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