Road to Hell - Changing FPS

mpv Information

No response

Important Information

All versions of MPV

Reproduction Steps

Simply changing the FPS of media (and adding pitch) manually is more complex than it needs to be.

Problem:
Change 23.976 to 24 and normalize audio

Solution:

[23.976 to 24]
profile-cond=container-fps=23.976
speed=1.001001
pitch=1.001001
audio-pitch-correction=no
af-add=rubberband=pitch-scale=0.999,engine=finer
sub-speed=24/23.976 (this value will work with speed/pitch too ?)
sub-fps=24

Proposed solution:
If mpv can handle conditions, how about the following:

fps-cond = 23.976 = 24
audio-pitch-correction = hd
sub-??? = video-out-fps

Additionally it would be nice to hold one frame longer instead of repeating it. hold-cond = 24 = 2 for example would output 24 frames in 2 seconds instead of bobbing the output to 48 frames (reduces CPU/GPU usage)

Also I want to mention that the manual is very confusing on this topic, see image attached:

Expected Behavior

Simple and straightforward

Actual Behavior

Not simple and straightforward

The issue identifies no source file, test, or entry point. Start by tracing mpv's existing profile-cond, speed, pitch, subtitle-speed, and audio-filter options, then clarify how the proposed FPS and frame-holding conditions should interact. Done would require an agreed scope, documented behavior, and tests covering timing, audio pitch, subtitles, and frame output.