Bug Report: No Video Displayed When Using --start Parameter with mpv

[yuchen-lea]

mpv Information

mpv 0.38.0 Copyright © 2000-2024 mpv/MPlayer/mplayer2 projects
 built on Apr 17 2024 19:18:44
libplacebo version: v7.349.0
FFmpeg version: 7.0.1
FFmpeg library versions:
   libavutil       59.8.100
   libavcodec      61.3.100
   libavformat     61.1.100
   libswscale      8.1.100
   libavfilter     10.1.100
   libswresample   5.1.100

Other Information

• macOS version: macOS 13.6.3 (22G436)
• Source of mpv: brew

Reproduction Steps

1. Open a terminal.
2. Execute the following command:

mpv "https://www.youtube.com/watch?v=vWpDs1riqbQ" --start=+130

Expected Behavior

The video should start playing from the specified timestamp (2 minutes and 10 seconds) with both audio and video.

Actual Behavior

Only audio is played, and the video is not displayed.
Execute without --start Parameter will play with both audio and video.
I'm not sure if this is related to #14091

Log File

output.txt

Sample Files

I carefully read all instruction and confirm that I did the following:

• I tested with the latest mpv version to validate that the issue is not already fixed.
• I provided all required information including system and mpv version.
• I produced the log file with the exact same set of files, parameters, and conditions used in "Reproduction Steps", with the addition of --log-file=output.txt.
• I produced the log file while the behaviors described in "Actual Behavior" were actively observed.
• I attached the full, untruncated log file.
• I attached the backtrace in the case of a crash.

[low-batt]

Did not reproduce for me using mpv built from master via mpv-build with an up to date yt-dlp:

low-batt@gag mpv-build (master %=)$ mpv/build/mpv --no-config --start=+130 https://www.youtube.com/watch?v=vWpDs1riqbQ
● Video  --vid=1  --vlang=eng  (vp9 2560x1388 30 fps) [default]
● Audio  --aid=1  --alang=eng  (opus 2ch 48000 Hz) [default]
File tags:
 Uploader: John Kitchin
 Channel_URL: https://www.youtube.com/channel/UCQp2VLAOlvq142YN3JO3y8w
AO: [coreaudio] 48000Hz stereo 2ch floatp
VO: [gpu] 2560x1388 yuv420p
AV: 00:02:20 / 00:07:41 (30%) A-V:  0.000 Cache: 6.2s/1MB    
Exiting... (Quit)
low-batt@gag mpv-build (master %=)$ yt-dlp --version
2024.07.25

Playback started with video at 2:10 as expected.

This test was run on a MacBook Pro with M1 chip under macOS 13.6.3.

[low-batt]

Using mpv 0.38.0 on a Mac with an older version of yt-dlp I was able to reproduce the behavior where no video was shown. After updating yt-dlp to version 2024.07.25, mpv 0.38.0 worked.

@yuchen-lea Check your version of yt-dlp and make sure it is up to date.

YouTube often changes their web page structure, sometimes breaking compatibility with yt-dlp.

[yuchen-lea]

Sorry for forgetting to check the version of yt-dlp, I found that the latest yt-dlp also works well with the older version of mpv. Thank you for your suggestion!