[FFmpeg-user] Question about v4l2 controls and ffmpeg, also dts muxer problems

[Goetz Dapp]

On Sat, May 5, 2012 at 1:09 AM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> Goetz Dapp <goetz.dapp <at> googlemail.com> writes:
>
> > ffmpeg -f video4linux2 -framerate 30 -video_size hd720 -input_format
> > mjpeg -fflags igndts -an -i /dev/video0 -c:v copy -an /HDD2/test1.mjpeg
>
> > I am curious though if there is any way of controlling the v4l2 control
> > ids through ffmpeg, i.e. things like V4L2_CID_WHITE_BALANCE_TEMPERATURE,
> > V4L2_CID_DO_WHITE_BALANCE, V4L2_CID_FOCUS_AUTO ...
>
> No, but I believe it should be straight-forward to implement, see
> v4l2_set_parameters() and options[] in libavdevice/v4l2.c
>
>
Sorry it took me a while to respond. I did some searching, but I think I am
not entirely clear what this would entail. Since I am not a programmer,
could you give me some more ideas how that could be done?


> > The autofocus particularly kicks in during recording and messes things
> up.
>
> > I also have another problem, namely that I am getting tons of errors
> > "/Application provided invalid, non monotonically //increasing dts to
> muxer"
>
> Complete, uncut console output missing.
>

See: http://pastebin.com/iVcchSVv


>
> > If I tell it to save it as an .avi file it crashes immediately
>
> Crashes are important, please provide the missing information
> as explained on http://ffmpeg.org/bugreports.html
>
>
Do I need to compile ffmpeg to get the ffmpeg_g? Here is what I get in the
regular console:

http://pastebin.com/TerkNUPP



> > with the mjpeg it seems to record relatively OK. Is there a
> > way of solving this?
>
> > Or, at the least, to turn off the error messages?
>
> -loglevel xx ?
>

Thanks! I completely missed that.


> Carl Eugen
>
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Thanks for your help!

Goetz