#804 Rendered PGS subtitles have noise at right side

[b2f9h203]

See attached image and also sample video file.
There is noice at the right end of the subtitle. The noise changes if the scene at the horizontal changes. Also the amount of noise is random. I think the noise appears where the subtitle length needs to be rounded up to I don't know 8 pixels width, i.e. for a subtitle with length 117 there would be 3 pixels wide bars of noise.

P.S.: VLC renders the subtitles in a different color and better antialiased. I thought PGS subtitles are bitmaps, so why does the color vary?

[Ricardo Villalba]

Could you provide a sample subtitle file with this problem?

[b2f9h203]

I actually already made a 7s clip, but I wasn't sure about uploading, because of copyright. I also tried to replace the video with testsrc RGB test video using ffmpeg, but in that case the bug disappears, I believe the bug only appears when something is moving at the place of the subtitle. Reencoding does not make the bug disappear, so it shouldn't be because of a corrupt video file (maybe the subs are corrupt). The clip would show 3 lines. The first line looks ok, the second and the third have that bug.

I have attached the subtitles fromt hat file which should contain 3 lines. I can't check it, I don't have a sup subtitlte editor at hand.

[Ricardo Villalba]

I can't see anything wrong with those subtitles in my computer.
What version of SMPlayer are you using? And the operating system?

[b2f9h203]

Debian Sid, Linux 4.5.0 (kernel pinned)
smplayer 16.11.0~ds0-1 amd64

[b2f9h203]

Here is the full clip. 7s should fall under fair use or whatever, I'll delete it in some days. If that still doesn't (not) work for you, then it seems my system setup is at fault.

[Ricardo Villalba]

Tested on Ubuntu 16.04, smplayer 17.3 with mpv 0.14 (tested also with 0.24). I still can't see anything wrong in the subtitles of that clip.
Maybe it's a bug in libass or mpv in your system.

Does the problem still happen if you select a different video output? (preferences -> general -> video)

[b2f9h203]

Output was "xv". Other tested outputs "gl" and "x11 (slow)" don't exhibit this bug. I have a GTX 760 CUDA Driver Version: 378.13, libass5:amd64 1:0.13.4-2, mpv (not installed), mplayer 2:1.3.0-6.