Showing the subtitle is delayed by 1 second about mpc-hc HOT 4 CLOSED

This isn't a bug. The subtitle timestamps are just slightly wrong.

Extracted sub is like this:

1
00:00:00,001 --> 00:00:01,001
1...

2
00:00:01,001 --> 00:00:02,001
2...

The video is just 1 fps. So first frame has timestamp 0.000, second 1.000, etcetera. Subtitles start one milisecond later, which in this case means a frame later (1 second). You can fix it by letting the subs start at exactly 0.000. The weird end times might be due to a rounding error in MkvToolNix.

from mpc-hc.

Thanks for reply. Correcting the start ms in SRT to .000 had solved the problem. However I wonder would it be more logical to round the time of the subtitle frame (and not ceil it)?

Also excuses for offtopic, I would be also interested about how to generate 25 FPS video from images using ffmpeg? Perhaps you can give a hint. I've tried ffmpeg -framerate 1 -i image_%d.png -r 25 -vcodec libx264 demo.mkv but that produces 1 FPS video.

from mpc-hc.

For rounding issue you need to go to MkvToolNix.

Try -framerate 25 instead of -framerate 1 -r 25

from mpc-hc.

I have created mkvmerge issue #2394.

Also thanks for the hint with ffmeg. Now video is 25 fps:

Input #0, image2, from 'image_%d.png':
  Duration: 00:00:00.40, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: png, rgb48be(pc), 400x400, 25 fps, 25 tbr, 25 tbn, 25 tbc

but the 10 input images are now played with 25 fps, thus all video is played in 10/25 seconds, while I need 10 seconds video. In other words, there is no image "duplication" (see this post).

from mpc-hc.