On 2022-02-28 12:28 pm, Gyan Doshi wrote:
On 2022-02-28 10:37 am, Steven Kan wrote:
I am overlaying real-time weather on streaming video:
https://www.youtube.com/channel/UCIVY11504PcY2sy2qpRhiMg/live
I have a script reading from openweather.org every 10 minutes and
writing to weather.txt*, and then drawtext reads weather.txt and
applies it via:
./ffmpeg -thread_queue_size 2048 -hwaccel videotoolbox -i
'rtsp://anonymous:password1@192.168.1.13:554' -hwaccel videotoolbox
-i 'rtsp://anonymous:password1@192.168.1.45:554' -vcodec
h264_videotoolbox -b:v 5000k -acodec copy -t 2:00:00 -filter_complex
"hstack=inputs=2,fps=20[stacked];[stacked]drawtext='fontfile=/System/Library/Fonts/Helvetica.ttc:
textfile=/tmp/weather.txt: fontcolor=white: fontsize=48:
x=(w-text_w)*0.01: y=(h-text_h)*0.01:reload=600'" -f flv
"rtmp://a.rtmp.youtube.com/live2/<my-youtube-streaming-key>”
It’s working, but it seems very inefficient to read weather.txt every
1 frame when it gets updated only every 12,000 frames.
According to the documentation, reload is a Boolean to read every
frame or not, and attempting reload=2 or reload=600 results in:
[drawtext @ 0x7fa696010600] Unable to parse option value "2" as boolean
Would it be worthy feature request to allow drawtext to accept
integer values N > 1, and then reload the text file every Nth frame?
It seems like a win for CPU and I/O loading, with the benefit of
being fully backward compatible with existing scripts that read in
every 1 frame (e.g. reload=1).
This has come up before. I'll patch it to make it an interval.
Patched in git master.
Regards,
Gyan
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