Hi Vlad,
W dniu 2025-03-01 o 08:35, Vladimir Mishonov via ffmpeg-user pisze:
On 2025-03-01 00:36, Vladimir Mishonov via ffmpeg-user wrote:
On 2025-02-28 23:26, BloodMan wrote:
Hi Vladimir,
I see on previous posts that resolutions are different, but also
frame rates are different and colour spaces (bt709 vs "") are different.
Are you really sure the problem is the resolution?
(I have no way to check, I'm just thinking out)
It is possible, but needs furher testing to say for sure.
BloodMan, it turns out you were right!
I've just tested with a spare RTSP IP camera that provides both a
primary and a backup stream. Both streams have the same characteristics
EXCEPT the resolution, of course.
And this command works:
ffmpeg -loglevel verbose \
-hwaccel vaapi -hwaccel_output_format vaapi -rtsp_transport tcp -i
rtsp://login:passw...@test.ip.camera/primary/stream \
-hwaccel vaapi -hwaccel_output_format vaapi -rtsp_transport tcp -i
rtsp://login:passw...@test.ip.camera/backup/stream \
-filter_complex "[0:v][1:v]overlay_vaapi=w=500" \
-c:v h264_vaapi -global_quality 25 -g 50 -r 25 -an test.mkv
The produced video file contains the expected output.
Of course I still need to figure out how to work around the case when
the streams are from different sources and their properties might not
match. If that is at all possible, of course.
[...]
I suspect colorspace, so try explicitly set on input (or convert)
colorspace maybe... There is a lot of options -vf, -pix_fmt, -sws_flags
etc. you can test - find them on ffmpeg wiki here
https://trac.ffmpeg.org/wiki/colorspace
Have fun :)
--
BloodMan
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