[FFmpeg-user] HW Acceleration 101? 2-Up Streaming from RTSP-->ffmpeg-->YouTube

Michael Koch astroelectronic at t-online.de
Mon Jan 18 20:58:39 EET 2021

Am 18.01.2021 um 19:18 schrieb Steven Kan:
> But now I want to do a “2-Up” live stream of two different cameras, side-by-side. Here’s an archive from last night (waiting for a mating pair of Barn Owls to move in):
> https://www.youtube.com/watch?v=GDN2MjPwn0Q&feature=youtu.be <https://www.youtube.com/watch?v=GDN2MjPwn0Q&feature=youtu.be>
> The cameras are each outputting 1920 x 1080 @ 25 fps.
> Now that I’m actually encoding, I need a lot more CPU/GPU. I’m running this in Win10 Pro/64 on an HP Microserver with an AMD Opteron X3418 Quad-Core, and the CPU runs at about ~65-80% while the integrated GPU runs at about ~55%.
> C:\Program Files\ffmpeg\bin> .\ffmpeg.exe -re -thread_queue_size 1024 -i rtsp://anonymous:password@ <rtsp://anonymous:password@> -i rtsp://anonymous:password@ <rtsp://anonymous:password@> -vcodec h264_amf -acodec copy -t 01:47:02 -filter_complex "nullsrc=size=3840x1080 [base]; [0:v] setpts=PTS-STARTPTS, scale=1920x1080 [upperleft]; [1:v] setpts=PTS-STARTPTS, scale=1920x1080 [upperright]; [base][upperleft] overlay=shortest=1 [tmp1]; [tmp1][upperright] overlay=shortest=1:x=1920" -f flv "rtmp://a.rtmp.youtube.com/live2/my-youtube-streaming-key <rtmp://a.rtmp.youtube.com/live2/my-youtube-streaming-key>”

Wouldn't it be easier to use something like
[upperleft][upperright] hstack


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