Opened 19 years ago
Last modified 15 years ago
#926 new defect
Distorted subtitles if encoded and display aspect ratios differ
| Reported by: | Owned by: | reimar | |
|---|---|---|---|
| Priority: | normal | Component: | demuxer |
| Version: | 1.0rc2 | Severity: | normal |
| Keywords: | Cc: | ||
| Blocked By: | Blocking: | ||
| Reproduced by developer: | no | Analyzed by developer: | no |
Description
When playing a Matroska file where the encoded pixel dimensions and the separately set display dimensions do not match, the rendering of text-based subtitles is distorted. i.e. when mplayer does
Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
[...]
[swscaler @ 0x88f60f0]SwScaler: 720x480 -> 720x540
This scaling affects also the display of subtitles making the letters look either too thin (as with the above output) or too wide. When distorted enough it has a negative effect on readability.
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For what it's worth, the workaround I've been using is to add 'vf-add=scale=1280:-2' to my config file. That apparently takes into account the Matroska display dimensions before rendering subtitles. I haven't come across videos wider than 1280 and my computer is fast enough to software-scale that, so it works all right. This workaround has also the benefit of avoiding pixelated subtitle display that you get if you render subtitles on a small video and then hardware-scale it fullscreen.