Playback is reset to the beginning whever I try to seek forward (4K 60FPS HEVC)

[vorou]

• mpv version: 0.35.0
• macOS Version: 12.6.1
• Source of the mpv: homebrew
• Sample video: https://0x0.st/oIjs.MOV
• Only happens with a 4K 60FPS video, can't repro with 4K 30FPS

Reproduction steps

1. Open the sample video

mpv --no-config oljs.MOV

2. Press RIGHT to seek forward

Expected behavior

The playback jumps to +5 seconds

Actual behavior

The playback does jump to +5 seconds but then immediately jumps to the beginning of the file

Log file

output.txt

Sample files

https://0x0.st/oIjs.MOV

[CounterPillow]

This looks to be an issue with the container. mpv by default does fast seeks for left/right arrow. You can test a precise seek by clicking on the seek bar at 5 seconds, and notice that it works fine. Furthermore, remuxing the file with ffmpeg -i input.MOV -c copy output.mp4 fixes the problem in the file.

You can also adjust your input.conf to do precise seeks for left/right arrow, but they are slower.

[vorou]

thanks for looking into this! can confirm remuxing and precise seeking fix it for me too.

that said, I'm confused about the statement

This looks to be an issue with the container.

does it mean there's something wrong with the file itself? it sounds weird because:

1. I'm importing them directly from iPhone 12 with no alterations whatsoever
2. Previously they would fast seek just fine with mpv (don't remember the mpv version though, will check if I have it on another machine)

UPD: confirmed that the fast seek works fine for me with the test file in this version:

mpv 0.34.1 Copyright © 2000-2021 mpv/MPlayer/mplayer2 projects
built on Sat Jan 8 16:50:23 CET 2022
FFmpeg library versions:
libavutil 56.70.100
libavcodec 58.134.100
libavformat 58.76.100
libswscale 5.9.100
libavfilter 7.110.100
libswresample 3.9.100
FFmpeg version: 4.4.1

[vorou]

still an issue in the 0.35.1, fast seek works fine for the same file in 0.34.1

─>$ mpv --version
mpv 0.35.1 Copyright © 2000-2023 mpv/MPlayer/mplayer2 projects
built on Sat Jan 28 04:49:47 2023
FFmpeg library versions:
libavutil 58.2.100
libavcodec 60.3.100
libavformat 60.3.100
libswscale 7.1.100
libavfilter 9.3.100
libswresample 4.10.100
FFmpeg version: 6.0

[vorou]

for anyone else experiencing this, here's 0.34.1 binaries https://www.icloud.com/iclouddrive/05dEpLyOiz2gErW1x3r4iiNBQ#mpv-034-1

[Akemi]

duplicate of #12047 and an ffmpeg issue https://trac.ffmpeg.org/ticket/10585

closing this even though it's the older one, because the other issue has a working sample and some more infos and insight.