Judder / stutter during dolly shot about minema HOT 3 CLOSED

I appreciate the amount of effort and time you put into the report, however unfortunately I didn't find any issues with the video.

I didn't check fully but it seems like every frame has exactly 0.029 (or ~0.03) X step, judging from the F3 video provided, and the Frame label has the same exact amount of frames as the length of the video (I checked in Adobe Premiere, last visible frame was at 8:25 which is 505 frames, and last frame shown Frame: 504 which is exactly 505 frames if you count also Frame: 0).

I don't think it's a Minema issue as on my side I don't have any frame skips neither in video editor nor in the media player (sometimes only the first time due to preloading data).

My wild guess would be it's either due to:

1. The monitor's refresh rate
2. Some Linux stuff
3. High bitrate of the video

I have the most certainty it's 3., Minema records at very high bitrates by defaukt, maybe the amount of data is causing those stutters? I can't judge for sure as I don't know whether GitHub compressed these videos or if you did it manually. Hopefully that helps.

from minema.

@mchorse, thanks for getting back to me so quickly. I configured minema to shoot lossless x264 with -crf 0. The source videos do indeed have very high data rate. Before uploading the videos, I recompressed them with

ffmpeg -i INFILE.mp4 -vcodec libx264 -preset medium -qp 18 OUTFILE.mp4

And I still see the issue on the recompressed video. I have also observed the issue when encoding a raw image series directly with -qp 18. I see it with VP9 recompression, too:

ffmpeg -i INFILE.mp4 -vcodec=libvpx-vp9 -crf 27 \
   -vb 1900k -minrate 1300k -maxrate 3000k -g 600 \
  OUTFILE.webm

Perhaps the data rate is still too high. Maybe there's an issue recompressing the lossless video. I have found that the quality metrics don't seem to work well for Minecraft videos. (Probably because they are optimized for "live-action" cinema.)

This judder test video on youtube plays mostly smooth for me, and it has a much higher average data rate than my videos. I have plenty of CPU and I/O margin for video. The youtube framerate is slightly lower: 60000/1001 instead of 60.0. This might matter.

Since my video plays smoothly for you, I'm going to close this issue as invalid. I suspect that this is either a pulldown/refresh rate issue with my hardware or some problem with the encoding. If you have any encoding tips, I'd certainly appreciate them.

from minema.

I sadly don't have any tips, I'm a noob at ffmpeg stuff. 😰

Hopefully you'll figure this out! 🍀

from minema.