Questions tagged [framerate]
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195 questions
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9 views
Changing frame rate on Audio
We recorded with timecode, and the Frame rate of the Audio Timecode was mistakenly set to 30fps, and the frame rate of the camera was 23.9... the time code is super accurete, but Davinci cant read it ...
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21 views
Recording a projector with a camera: rainbow stripes moving at the same speed at different refresh rates. Why?
I'm recording a scene illuminated by a LED DLP projector with my camera. The projector is connected via the HDMI cable to a Windows 11 computer. The camera produces a video where rainbow (colored) ...
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1 answer
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Recording video: how can DSLRs allow setting exposure that's longer than the frame duration?
On a Canon EOS R10, in the manual video mode, it is possible to set the video frame rate to 50 FPS (making each frame 0.02 seconds long), but at the same time, the camera lets me set the exposure ...
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54 views
How SRT subtitles are affected by frame rates
I've found several explanations about how frame rates affect the timing of subtitles when these subtitles are stored in SRT format. I'll use this forum to ask a more specific question with an example. ...
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1 answer
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How to know how many still image from a sped-up video?
I found out here that frames could be gone when the video is sped up. For example, a 30 fps video 60 minutes would have 30 x 10.800 frames that practically a picture you can process, with probably ...
1 vote
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244 views
How can I speed up a GIF animation by several orders of magnitude to create a persistence of vision effect?
I have a GIF animation consisting of 51 frames, generated by mathematical software (of a deforming curve). It plays back by default at 10 FPS, for a duration of 5.1 seconds. My goal is to play it in ...
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1 vote
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27 views
Frame duration issues when trimming videos in MATLAB/ffmpeg?
I have two videos (A.MOV and B.MOV), that are supposed to be perfectly synced. However, Video A (3708 frames), has 5 more frames than Video B (3703 frames). When I look at the timestamps of these ...
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1 vote
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142 views
Convert 50fps to 25fps by skipping frames but not changing speed
I have a 50p H264 video which was originally shot normally at 25p, but encoded by some idiot to 50p. So every frame is encoded twice. Is it possible to copy it by skipping every second frame, and ...
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1 vote
2 answers
614 views
How can I choose the correct shutter speed to avoid banding when taking video of projected video?
I need to record video projected onto a wall or screen by an Optoma EP726 digital projector. I need to record it on a Canon EOS 77D at 23.976fps. I first tested videos of various frame rates, all ...
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1 vote
1 answer
414 views
Kdenlive project stuck on 25 fps
I have a Kdenlive project that was started with 25 FPS and now I want to switch it to 30 FPS, but no matter what I do, it stays on 25 FPS and produces 25 FPS output files during rendering. The title ...
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1 vote
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50 views
Restoring High Frame Rate Video After Forced Slow Motion Conversion
I'm dealing with a tricky situation involving high frame rate video recording and need some guidance. For an experiment, I needed to record a video at a high frame rate. The only way to achieve this ...
2 votes
1 answer
800 views
How to encode scenes with different CRF into a H.264 MP4 video with a variable frame rate?
Source Material Having many scenes which essentially are still frames (for many seconds) Commonly found in: Slideshows, Screen Recording or Software Mockup/Prototype ✅ This kind of source material ...
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2 votes
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35 views
Using video to prove an alarm is flashing
I'm in a bit of an annoying problem. I know nothing about video, so sorry if I'm using wrong terminology. I live in an apartment buliding in downtown Tel Aviv. On the ground floor of my building there'...
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1 vote
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333 views
ffmpeg: How to decimate frame rate without recompressing, for I-Frame only video, like ProRes?
I use a capture device from Atomos to capture video in ProRes format over HDMI. The issue is, this device will only capture video in the exact same frame rate as the HDMI signal's refresh rate. So a ...
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1 vote
1 answer
72 views
2 video files, one has the audio with 15FPS, the other has the video with 5FPS, audio is out of sync
I'm trying to sync the audio and video of 2 different files, one is a 15 FPS webcam stream with audio and the other is a screen share with 5 FPS. This is an educational setting. I'm trying to do the ...
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