AssRender is an AviSynth plugin that renders ASS/SSA and SRT (without the HTML-like markup) subtitles. It uses libass to render the subtitles, which makes it the fastest and most correct ASS renderer for AviSynth.

This also means that it is much more picky about script syntax than VSFilter and friends, so keep that in mind before blaming the filter. Yes, people have reported a lot of errors that were actually the script author’s fault.

assrender(clip, string file, [string vfr, int hinting, float scale, float line_spacing, float dar, float sar, int top, int bottom, int left, int right, string charset, int debuglevel, string fontdir, string srt_font, string colorspace])

string file

Your subtitle file. May be ASS, SSA or SRT.

string vfr

Specify timecodes v1 or v2 file when working with VFRaC.

int hinting

Font hinting mode. Choose between none (0, default), light (1), normal (2) and Freetype native (3) autohinting.

float scale

Font scale. Defaults to 1.0.

float line_spacing

Line spacing in pixels. Defaults to 1.0 and won’t be scaled with frame size.

float dar, float sar

Aspect ratio. Of course you need to set both parameters.

int top, int bottom, int left, int right

Margins. They will be added to the frame size and may be negative.

string charset

Character set to use, in GNU iconv or enca format. Defaults to UTF-8. Example enca format: enca:pl:cp1250 (guess the encoding for Polish, fall back on cp1250)

int debuglevel

How much crap assrender is supposed to spam to stderr.

string fontdir

Additional font directory. Useful if you are lazy but want to keep your system fonts clean. Default value: C:/Windows/Fonts or /usr/share/fonts (Windows and linux respectively)

string srt_font

Font to use for SRT subtitles. Defaults to whatever Fontconfig chooses for “sans-serif”.

string colorspace

The color space of your (YUV) video. Possible values:

• Rec2020, BT.2020
• Rec709, BT.709
• Rec601, BT.601
• PC.709
• PC.601
• TV.fcc, PC.fcc
• TV.240m, PC.240m
• none, guess

Default is to use the ASS script's "YCbCr Matrix" or "Video Colorspace" property.

Recognized .ASS properties: "TV.601" "TV.709", "PC.601" "PC.709" "TV.240m" "PC.240m" "TV.fcc" "PC.fcc" and "none".

"none" and "guess" decides upon on video resolution: width > 1280 or height > 576 → BT.709, else → BT.601. When no hint found in ASS script and 'colorspace' parameter is empty then the default is BT.601.

See: BUILD.md

See: CHANGELOG.md

For all modules: see msvc/licenses

• Doom9 forum: https://forum.doom9.org/showthread.php?t=148926
• Avisynth wiki: http://avisynth.nl/index.php/AssRender
• libass original: https://github.com/libass/libass
• libass submodule used for msvc https://github.com/ShiftMediaProject/libass
• Aegisub: https://github.com/Aegisub/Aegisub