On 2025-02-28 02:36, Greg Oliver wrote:
On Thu, Feb 27, 2025 at 11:25 AM Vladimir Mishonov via ffmpeg-user <
ffmpeg-user@ffmpeg.org> wrote:
https://ffmpeg.org/pipermail/ffmpeg-user/2024-August/058638.html
Thanks for the link. Unfortunately, that seems to be only tangentially
related to my scenario because:
1) The resolutions of each input stream do not change over time.
2) I can use software decoding and I do not need to insert any scale
filters before sending the streams to hardware:
ffmpeg -init_hw_device vaapi=hw -filter_hw_device hw \
-i rtmp://localhost/stream1 \
-i rtmp://localhost/stream2 \
-filter_complex
"[0:v]format=nv12,hwupload=extra_hw_frames=120[i0];[1:v]format=nv12,hwupload=extra_hw_frames=120[i1];[i0][i1]overlay_vaapi=w=500"
\
-c:v h264_vaapi -global_quality 25 -g 50 -r 25 -an -f null -
The above command works regardless of whether the input resolutions are
the same, or different. The CPU usage is quite low, but still
noticeable. Note that even if some kind of filter does get automatically
inserted, it does not interfere with the videos themselves in any way -
otherwise, I would have noticed it long ago either because of excessive
CPU usage, or the resolution and/or the content of the output stream
being different from what is expected, or both.
It would also be, in principle, fundamentally wrong to apply any kind of
software processing in a (theoretically) purely hardware filter pipeline
- not to mention pointless due to the overlay filter in the end, which
performs its own scaling anyway.
P.S. sorry for top-posting the previous response, I forget it's not
customary because I very rarely use mailing lists, only when there is no
other option.
---
Kind regards,
Vladimir
_______________________________________________
ffmpeg-user mailing list
ffmpeg-user@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-user
To unsubscribe, visit link above, or email
ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
