Question / Help Video that is supposed to be 60 fps is actually 62.5 fps

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se_vb

New Member
I recently made the move to save storage on my computer by switching to MKV with HEVC and Opus. I have used the same resolution for both my new and old setup (MP4 15Mbps).
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I recently noticed an issue though. I had checked the properties of one of my MKVs, and saw that the frame rate was 62.5 fps. I wasn't really shocked (as that might have been inaccurate), but I recorded another video (just to be sure it wasn't actually incorrect output) and used ffplay (ffmpeg 4.2.1), and in the command line, it displayed this:
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For me, I was actually quite surprised. Supposedly I set the frame rate to 58, made a very short test recording, and...
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I changed the frame rate again to 59 fps, and it was 62.5 fps (the same for "60"). Lavf58.20.100 means that OBS is using ffmpeg 4.2.1. However, since I'm bothered, I'm now wondering:

Is there an issue with my recording?
(log file: https://obsproject.com/logs/_n00g1JmmTI0-D75)
 
S

Schauerland

Member
although this thread is open a while. i see the same issue, but only with ffmpeg custom output.
normal output is fine. also if you take the video and remux with avidemux video is 60 after that.
so this seems to be a weird metadata issue
 
R

rockbottom

Active Member
It's something with your custom settings or possibly being caused by using OPUS. Take a look at this thread & do some testing. I never found out if the OP has CoreAudio installed. (I don't)

custom ffmpeg produces vfr on mkv and cfr on mp4 with same encoder settings

Hi. I use custom ffmpeg with h264/aac inside. if I use mkv as container the video stream is variable frame rate 62.5 fps if i use mp4 with the same settings (just switching container) it is constant framerate 60 like it should. there is no change if i remux mkv records to mp4 it stays vfr. if...
obsproject.com obsproject.com
 
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