On Sat, Mar 18, 2017 at 08:41:14PM -0400, Nicolas Dufresne wrote:
> Le samedi 18 mars 2017 à 20:43 +0000, Russell King - ARM Linux a
> écrit :
> > On Sat, Mar 18, 2017 at 12:58:27PM -0700, Steve Longerbeam wrote:
> > > Can you share your gstreamer pipeline? For now, until
> > > VIDIOC_ENUM_FRAMESIZES is implemented, try a pipeline that
> > > does not attempt to specify a frame rate. I use the attached
> > > script for testing, which works for me.
> >
> > It's nothing more than
> >
> > gst-launch-1.0 -v v4l2src ! <any needed conversions> ! xvimagesink
> >
> > in my case, the conversions are bayer2rgbneon. However, this only
> > shows
> > you the frame rate negotiated on the pads (which is actually good
> > enough
> > to show the issue.)
> >
> > How I stumbled across though this was when I was trying to encode:
> >
> > gst-launch-1.0 v4l2src device=/dev/video9 ! bayer2rgbneon ! \
> > videoconvert ! x264enc speed-preset=1 ! avimux ! \
> > filesink location=test.avi
> >
> > I noticed that vlc would always say it was playing the resulting AVI
> > at 30fps.
>
> In practice, I have the impression there is a fair reason why framerate
> enumeration isn't implemented (considering there is only 1 valid rate).
That's actually completely incorrect.
With the capture device interfacing directly with CSI, it's possible
_today_ to select:
* the CSI sink pad's resolution
* the CSI sink pad's resolution with the width and/or height halved
* the CSI sink pad's frame rate
* the CSI sink pad's frame rate divided by the frame drop factor
To put it another way, these are possible:
# v4l2-ctl -d /dev/video10 --list-formats-ext
ioctl: VIDIOC_ENUM_FMT
Index : 0
Type : Video Capture
Pixel Format: 'RGGB'
Name : 8-bit Bayer RGRG/GBGB
Size: Discrete 816x616
Interval: Discrete 0.040s (25.000 fps)
Interval: Discrete 0.048s (20.833 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.053s (18.750 fps)
Interval: Discrete 0.060s (16.667 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.080s (12.500 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.120s (8.333 fps)
Interval: Discrete 0.160s (6.250 fps)
Interval: Discrete 0.200s (5.000 fps)
Interval: Discrete 0.240s (4.167 fps)
Size: Discrete 408x616
<same intervals>
Size: Discrete 816x308
<same intervals>
Size: Discrete 408x308
<same intervals>
These don't become possible as a result of implementing the enums,
they're all already requestable through /dev/video10.
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