mpv-player / mpv-player/mpv

[FramedropBug] mpv always framedrops with specific subtitle on?

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core:subtitle down-upstream:libass os:win
Dominant language
C
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Description

Important Information

Provide following Information:

Expected behavior

mpv plays video.mkv embed .ass subtitle without framedrop

Actual behavior

mpv always frame drops with subtitle on.

Log file

mpv --no-config vid.mkv -v -v --log-file=log0.txt
log0.txt

Sample files

video-sample.zip

I noticed that with mpv-android if I use it on portrait orientation there is no framedrop but if I use landscape orientation mpv-android also start to framedrop?
mpv-android-log0-portrait-mode.txt
mpv-android-log1-landscape-mode.txt

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the report with video-sample.zip using the provided mpv command and compare log0.txt with the portrait and landscape mpv-android logs. Trace the subtitle-on playback path and verify the result by confirming that the sample plays without framedrops while the embedded ASS subtitle is enabled.

Written by the indexing model from the issue text.

Assessment

Tech stack
c
Domain
audio-video-rtc, performance
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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