search

lisamelton / other_video_transcoding

Other tools to transcode videos.
MIT License
540 stars 24 forks source link

Unusual slowdown with 10 bit (hevc) output #192

Closed BTMeeks closed 10 months ago

BTMeeks commented 10 months ago

Long time slow user of transcode and other-transcode, on MacOS, trying to get things working on Windows PC with Nvidia 3060.

My first three movies without hevc option were 175, 145, and 145 FPS. With the hevc option on the same 3 movies, I got 143, 6.2, and 127 fps. I'm trying to understand why that one title was 23x slower, not why the other two were a little slower.

I imagine this is more of an ffmpeg question, rather than other-transcode, but I thought I would start here. Log file attached.

Bug report.zip

lisamelton commented 10 months ago

@BTMeeks I'm sorry you're having this problem. Thank you for including log files. But the "8-Bit" folder seems to 10-bit data and the same as what's in the "10-bit" folder.

That said, I'm not seeing anything obvious as to why you're getting 6.2 FPS for The Life Aquatic with Steve Zissou (2004).

lisamelton commented 10 months ago

@BTMeeks Also, as you suspected, this will most certainly be a FFmpeg issue.

ttyS0 commented 10 months ago

@BTMeeks I notice you're running a git version of ffmpeg, (2023-08-14-git-c704901324). If there is a strange ffmpeg bug causing this, which it certainly has the smell of, you might want to try using the 5.1.2 release version, and see if the problem persists.

BTMeeks commented 10 months ago

@ttyS0 "That's a bingo". I swapped out my ffmpeg with 5.1.latest, and got 162 FPS on that title. I didn't find 5.1.2, but 5.1.latest ended up being "ffmpeg version n5.1.3-16-g566aa38d98-20230826 ".

@lisamelton Yes, "most certainly be a FFmpeg issue".