[FFmpeg-user] v4l2 overlay on mjpeg stream

[Baltazár Radics]

output of `ffmpeg -i https://192.168.11.139:8080/video -thread_queue_size
2048 -i /dev/video3 -filter_complex
'[0:v]scale=iw*4/3:-1,crop=1280:720[cam];[1:v]scale=4*iw:-1:flags=neighbor[calc];[cam]
[calc]overlay' -vcodec rawvideo -pix_fmt yuv420p -f v4l2 /dev/video2`:
http://ix.io/2NeC
output of `ffmpeg -i /dev/video0 -i /dev/video3 -filter_complex
'[0:v]scale=iw*4/3:-1[cam];[1:v]scale=4*iw:-1:flags=neighbor[calc];[cam][calc]overlay'
-vcodec rawvideo -pix_fmt yuv420p -f v4l2 /de
v/video2`: http://ix.io/2NeD

In both cases, I pressed `q` after ten seconds or so.
I have built ffmpeg version N-100777-g2bcec40cce, but that should be
visible in the output.

On Mon, Jan 25, 2021 at 12:03 AM Carl Eugen Hoyos <ceffmpeg at gmail.com>
wrote:

> Am So., 24. Jan. 2021 um 23:34 Uhr schrieb Baltazár Radics
> <baltazar.radics at gmail.com>:
> >
> > I'm trying to overlay a v4l2 input on the mjpeg stream of an android IP
> > camera. The first few seconds are alright, but the overlay slowly lags
> > behind more and more, and starts dropping frames.
> > I also get the following warning:
> > >
> > > Thread message queue blocking; consider raising the
> > > thread_queue_size option
> >
> > I have tried raising it but it doesn't seem to help.
> > The command I'm using (the output is a v4l2loopback device):
> > ffmpeg -i https://192.168.11.139:8080/video -i /dev/video3
> -filter_complex
> >
> '[0:v]scale=iw*4/3:-1,crop=1280:720[cam];[1:v]scale=4*iw:-1:flags=neighbor[calc];[cam][calc]overlay'
> > -vcodec rawvideo -pix_fmt yuv420p -f v4l2 /dev/video2
>
> Please test current FFmpeg git head and provide the command line you tested
> together with the complete, uncut console output.
>
> > Overlaying a v4l2 source on another v4l2 source works perfectly with the
> > same filter.
>
> Feel free to show this one as well.
>
> Carl Eugen
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