Empty lines in subtitle output
 

I am creating MKV files with OCR'd subtitles. Now after I mux them using mkvmerge, there are sometimes empty lines visible in BSPlayer. I cannot find anything in common among various occurences of this issue.

Here's how it looks:
-------------------------------------




* Normal subtitles, line 1.
* Normal subtitles, line 2.
-------------------------------------

-------------------------------------



* * Some subs shifted up
* * * * * * *by one line.

-------------------------------------

What could be the cause of this?

This I recall occured in some older builds when the start-time of the second subtitle was less than the end-time of the first subtitle:

1
0:00:00->0:00:05

2
0:00:04->0:00:10

In this case, BSPlayer automatically displayed the second subtitle one row up. But...this was long time ago.

The muxed subtitle was srt format ? If so, are you sure there isn't an unwanted CR on that point.

I'll see if the times really overlap in all cases. Maybe this is it.

Yes, the source is SRT. I thought about an orphaned CR or LF being there, like when you press Shift-Enter in certain programs, and forced full CR-LF (DOS mode) in my editor. This did not solve the problem.

No this was not it. I checked and there was no time overlap.

Since the problem occurs much more often when special Unicode characters are in use, I suppose it's yet another width-related issue.

One more thing I must use ffdshow for. :lol:

Can you post a link or send me such a file ?

I can, but there is really nothing to see. The entire text is in Russian (= special characters), re-timed by me. This SRT has been demuxed from the Matroska file.

I've tried your subtitle file and I can read all the lines (at least until the 45th subtitle segment) without problems (exception made for some lines in which the first/last character is lost due to the known char-cut bug) :roll:

Yeap, the problem is there.

Line 8 and line 11 from the beginnig are the closest. But no problems with cutt-off letters. I will look more into it.