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Questions - frame-rate

Different frame rate calculation methods produce very different results

As part of a hand gesture recognition system based on OpenCV and MediaPipe (from Google) I investigated the frame rate possible. The code in approach 1 was used first (partly from a YouTube video and ...
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rlh

python

opencv

frame-rate

mediapipe

Votes: 0

Answers: 1

Latest Answer

Of course it has different results between #1 and #2 in #1, these lines are also counted to the delta_time cur_fps = np.around(frames / delta_time, 1) # used for displaying hand and o...
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danangjoyoo

Output video to both file and pipe: simultaneously using FFmpeg Libav

I have been trying to output video (from my webcam) simultaneously to both a file ('out.mkv') and pipe: The file gets filtered frames, and the pipe: gets unfiltered rawvideo. My frame rate is 30 fps. ...
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Hillel Rosensweig

c

ffmpeg

pipe

frame-rate

libav

Votes: 0

Answers: 1

Latest Answer

It is hard to tell without any profiling, but you're probably correct given what you're seeing. I'd be curious to know if you eliminate one of the write outs if you see better performance. I always w...
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syntheticgio

Timelapse (1/6 fps) from slo-mo (240 fps) with ffmpeg

I recorded slo-mo video on an iPhone SE (2) by mistake instead of timelapse. I know there's a lot of answers to this question here, but I'm trying again and again and always something's wrong (like a ...
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baskak

ffmpeg

frame-rate

timelapse

slowmotion

Votes: 0

Answers: 2

Latest Answer

This command seems to do the trick: ffmpeg -i IMG_2174.MOV -vf framestep=1440,setpts=N/30/TB -c:v libx264 -preset slow -crf 22 -an -r 30 IMG_2174.timelapse.MOV
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baskak

In Chome devtools Performance, why is the FPS always showing 60fps with dropped frames, but actually it isn't

I'm studying Analyze runtime performance using the demo https://googlechrome.github.io/devtools-samples/jank/ When I open FPS meter (using Frame Rendering Stats in Rendering tab), it shows 10.8 fps: ...
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Serena

performance

google-chrome

google-chrome-devtools

frame-rate

Votes: 0

Answers: 1

Latest Answer

I tried https://googlechrome.github.io/devtools-samples/jank/ and set the CPU "6x slowdown" in the Performance tab. The animation became significantly janky, while the Frame Rate was still v...
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