CRITICAL GUIDELINES

重要指南

Windows File Path Requirements

Windows文件路径要求

MANDATORY: Always Use Backslashes on Windows for File Paths

When using Edit or Write tools on Windows, you MUST use backslashes (

) in file paths, NOT forward slashes (

).

强制要求：Windows系统下文件路径必须使用反斜杠

在Windows系统使用编辑或写入工具时，文件路径必须使用反斜杠（

），不能使用正斜杠（

）。

Documentation Guidelines

文档规范

NEVER create new documentation files unless explicitly requested by the user.

除非用户明确要求，否则绝不创建新的文档文件。

Quick Reference

快速参考

Task	Command
Burn SRT	`ffmpeg -i video.mp4 -vf "subtitles=subs.srt" output.mp4`
Burn ASS	`ffmpeg -i video.mp4 -vf "ass=subs.ass" output.mp4`
Add soft sub	`ffmpeg -i video.mp4 -i subs.srt -c copy -c:s mov_text output.mp4`
Extract sub	`ffmpeg -i video.mkv -map 0:s:0 output.srt`
Style subs	`-vf "subtitles=s.srt:force_style='FontSize=24,PrimaryColour=&HFFFFFF'"`
Text overlay	`-vf "drawtext=text='Hello':x=10:y=10:fontsize=24:fontcolor=white"`

Format	Extension	Best For
SRT	.srt	Simple, universal
ASS	.ass	Styled, animated, anime
VTT	.vtt	Web/HTML5 video

任务	命令
硬嵌入SRT字幕	`ffmpeg -i video.mp4 -vf "subtitles=subs.srt" output.mp4`
硬嵌入ASS字幕	`ffmpeg -i video.mp4 -vf "ass=subs.ass" output.mp4`
添加软字幕	`ffmpeg -i video.mp4 -i subs.srt -c copy -c:s mov_text output.mp4`
提取字幕	`ffmpeg -i video.mkv -map 0:s:0 output.srt`
设置字幕样式	`-vf "subtitles=s.srt:force_style='FontSize=24,PrimaryColour=&HFFFFFF'"`
添加文本叠加层	`-vf "drawtext=text='Hello':x=10:y=10:fontsize=24:fontcolor=white"`

格式	扩展名	适用场景
SRT	.srt	简单通用
ASS	.ass	带样式、动画，适用于动漫
VTT	.vtt	网页/HTML5视频

When to Use This Skill

适用场景

Use for subtitle and caption operations:

Hardcoding (burning) subtitles into video
Adding soft subtitle tracks to containers
Extracting subtitles from MKV/MP4
Styling captions (font, color, position)
Dynamic text overlays

适用于以下字幕与隐藏式字幕操作：

将字幕硬嵌入（烧录）到视频中
向容器添加软字幕轨道
从MKV/MP4中提取字幕
设置字幕样式（字体、颜色、位置）
添加动态文本叠加层

FFmpeg Captions and Subtitles (2025)

FFmpeg字幕与隐藏式字幕指南（2025版）

Complete guide to working with subtitles, closed captions, and text overlays using FFmpeg.

使用FFmpeg处理字幕、隐藏式字幕和文本叠加层的完整指南。

Subtitle Format Reference

字幕格式参考

Supported Formats

支持的格式

Format	Extension	Features	Use Case
SubRip	.srt	Simple timing + text	Universal, web
Advanced SubStation Alpha	.ass/.ssa	Rich styling, positioning, effects	Anime, styled subs
WebVTT	.vtt	Web standard, cues, styling	HTML5 video
TTML/DFXP	.ttml/.dfxp	Broadcast, accessibility	Streaming services
MOV Text	.mov (embedded)	QuickTime native	Apple ecosystem
DVB Subtitle	(embedded)	Bitmap-based	European broadcast
PGS	.sup	Blu-ray bitmap subtitles	Blu-ray
CEA-608/708	(embedded)	Closed captions	US broadcast, streaming

格式	扩展名	特性	适用场景
SubRip	.srt	简单时间轴+文本	通用、网页
Advanced SubStation Alpha	.ass/.ssa	丰富样式、定位、特效	动漫、带样式字幕
WebVTT	.vtt	网页标准、提示标记、样式	HTML5视频
TTML/DFXP	.ttml/.dfxp	广播级、无障碍	流媒体服务
MOV Text	.mov（内嵌）	QuickTime原生格式	Apple生态系统
DVB Subtitle	（内嵌）	位图格式	欧洲广播
PGS	.sup	蓝光位图字幕	蓝光视频
CEA-608/708	（内嵌）	隐藏式字幕	美国广播、流媒体

Format Characteristics

格式特性

bash

SRT (SubRip):
- Simple text-based format
- Supports basic HTML tags (<b>, <i>, <u>)
- Widely compatible
- No positioning or advanced styling

ASS/SSA:
- Advanced styling (fonts, colors, outlines)
- Precise positioning anywhere on screen
- Animation and effects support
- Karaoke timing

WebVTT:
- HTML5 standard format
- CSS-like styling
- Cue settings for positioning
- Speaker identification

bash

SRT (SubRip):
- 简单的文本格式
- 支持基础HTML标签（<b>, <i>, <u>）
- 兼容性广泛
- 不支持定位或高级样式

ASS/SSA:
- 高级样式（字体、颜色、轮廓）
- 可精确定位到屏幕任意位置
- 支持动画和特效
- 支持卡拉OK时间轴

WebVTT:
- HTML5标准格式
- 类CSS样式
- 支持提示标记定位
- 支持说话人识别

Burning Subtitles (Hardcoding)

字幕硬嵌入（烧录）

Basic Subtitle Burn-in

基础字幕硬嵌入

bash

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bash

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Burn SRT subtitles

硬嵌入SRT字幕

ffmpeg -i video.mp4 -vf "subtitles=subs.srt" output.mp4

Burn ASS/SSA subtitles (preserves styling)

硬嵌入ASS/SSA字幕（保留样式）

ffmpeg -i video.mp4 -vf "ass=subs.ass" output.mp4

Burn subtitles from MKV container

从MKV容器中硬嵌入字幕

ffmpeg -i video.mkv -vf "subtitles=video.mkv" output.mp4

Burn specific subtitle track (index 0)

硬嵌入指定字幕轨道（索引0）

ffmpeg -i video.mkv -vf "subtitles=video.mkv:si=0" output.mp4

Burn subtitles with stream index

通过流索引硬嵌入字幕

ffmpeg -i video.mkv -vf "subtitles=video.mkv:stream_index=1" output.mp4

undefined

ffmpeg -i video.mkv -vf "subtitles=video.mkv:stream_index=1" output.mp4

undefined

Styled Subtitle Burn-in

带样式的字幕硬嵌入

bash

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bash

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Force style (overrides subtitle styling)

强制设置样式（覆盖字幕原有样式）

ffmpeg -i video.mp4
-vf "subtitles=subs.srt:force_style='FontName=Arial,FontSize=24,PrimaryColour=&HFFFFFF,OutlineColour=&H000000,Outline=2,Shadow=1'"
output.mp4

Yellow subtitles with black outline

黄色字幕配黑色轮廓

ffmpeg -i video.mp4
-vf "subtitles=subs.srt:force_style='FontSize=28,PrimaryColour=&H00FFFF,OutlineColour=&H000000,Outline=3'"
output.mp4

Larger font for accessibility

大字体适配无障碍需求

ffmpeg -i video.mp4
-vf "subtitles=subs.srt:force_style='FontSize=36,Bold=1'"
output.mp4

undefined

ffmpeg -i video.mp4
-vf "subtitles=subs.srt:force_style='FontSize=36,Bold=1'"
output.mp4

undefined

ASS Style Parameters

ASS样式参数

Parameter	Description	Example
FontName	Font family	`FontName=Arial`
FontSize	Size in points	`FontSize=24`
PrimaryColour	Text color (AABBGGRR)	`PrimaryColour=&HFFFFFF`
SecondaryColour	Karaoke color	`SecondaryColour=&H00FFFF`
OutlineColour	Outline/border color	`OutlineColour=&H000000`
BackColour	Shadow/background color	`BackColour=&H80000000`
Bold	Bold text (0/1)	`Bold=1`
Italic	Italic text (0/1)	`Italic=1`
Underline	Underlined text (0/1)	`Underline=1`
Outline	Outline width	`Outline=2`
Shadow	Shadow depth	`Shadow=1`
Alignment	Position (numpad style)	`Alignment=2`
MarginL/R/V	Margins in pixels	`MarginV=50`

参数	说明	示例
FontName	字体家族	`FontName=Arial`
FontSize	字号（磅）	`FontSize=24`
PrimaryColour	文本颜色（AABBGGRR格式）	`PrimaryColour=&HFFFFFF`
SecondaryColour	卡拉OK高亮颜色	`SecondaryColour=&H00FFFF`
OutlineColour	轮廓/边框颜色	`OutlineColour=&H000000`
BackColour	阴影/背景颜色	`BackColour=&H80000000`
Bold	粗体（0/1）	`Bold=1`
Italic	斜体（0/1）	`Italic=1`
Underline	下划线（0/1）	`Underline=1`
Outline	轮廓宽度	`Outline=2`
Shadow	阴影深度	`Shadow=1`
Alignment	位置（小键盘布局）	`Alignment=2`
MarginL/R/V	边距（像素）	`MarginV=50`

Color Format (ASS)

ASS颜色格式

text

ASS uses &HAABBGGRR format (Alpha, Blue, Green, Red):
- White: &HFFFFFF or &H00FFFFFF
- Black: &H000000 or &H00000000
- Yellow: &H00FFFF (00-Blue, FF-Green, FF-Red)
- Red: &H0000FF
- Blue: &HFF0000
- 50% transparent black: &H80000000

text

ASS使用&AABBGGRR格式（Alpha, Blue, Green, Red）：
- 白色：&HFFFFFF 或 &H00FFFFFF
- 黑色：&H000000 或 &H00000000
- 黄色：&H00FFFF（00-蓝色, FF-绿色, FF-红色）
- 红色：&H0000FF
- 蓝色：&HFF0000
- 50%透明度黑色：&H80000000

Adding Subtitle Tracks (Soft Subs)

添加字幕轨道（软字幕）

Embed SRT as Track

嵌入SRT作为轨道

bash

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bash

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Add SRT to MP4 (MOV text)

将SRT嵌入MP4（MOV文本格式）

ffmpeg -i video.mp4 -i subs.srt
-c copy -c:s mov_text
output.mp4

Add SRT to MKV

将SRT嵌入MKV

ffmpeg -i video.mp4 -i subs.srt
-c copy -c:s srt
output.mkv

Add SRT to WebM (WebVTT)

将SRT嵌入WebM（WebVTT格式）

ffmpeg -i video.webm -i subs.srt
-c copy -c:s webvtt
output.webm

undefined

ffmpeg -i video.webm -i subs.srt
-c copy -c:s webvtt
output.webm

undefined

Multiple Subtitle Tracks

多语言字幕轨道

bash

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bash

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Add multiple languages

添加多语言字幕

ffmpeg -i video.mp4 -i subs_en.srt -i subs_es.srt -i subs_fr.srt
-map 0:v -map 0:a -map 1 -map 2 -map 3
-c copy -c:s mov_text
-metadata:s:s:0 language=eng -metadata:s:s:0 title="English"
-metadata:s:s:1 language=spa -metadata:s:s:1 title="Spanish"
-metadata:s:s:2 language=fra -metadata:s:s:2 title="French"
output.mp4

Add ASS subtitles to MKV (preserves styling)

将ASS字幕嵌入MKV（保留样式）

ffmpeg -i video.mp4 -i styled.ass
-map 0 -map 1
-c copy -c:s ass
output.mkv

undefined

ffmpeg -i video.mp4 -i styled.ass
-map 0 -map 1
-c copy -c:s ass
output.mkv

undefined

Set Default Subtitle Track

设置默认字幕轨道

bash

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bash

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Set subtitle as default

设置字幕为默认轨道

ffmpeg -i video.mp4 -i subs.srt
-c copy -c:s mov_text
-disposition:s:0 default
output.mp4

Set forced subtitles (always display)

设置强制字幕（始终显示）

ffmpeg -i video.mp4 -i forced.srt
-c copy -c:s mov_text
-disposition:s:0 forced
output.mp4

undefined

ffmpeg -i video.mp4 -i forced.srt
-c copy -c:s mov_text
-disposition:s:0 forced
output.mp4

undefined

Extracting Subtitles

提取字幕

Extract to External File

提取到外部文件

bash

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bash

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Extract first subtitle track to SRT

提取第一条字幕轨道为SRT格式

ffmpeg -i video.mkv -map 0:s:0 output.srt

Extract specific subtitle stream

提取指定字幕流

ffmpeg -i video.mkv -map 0:s:1 output.srt

Extract to ASS format

提取为ASS格式

ffmpeg -i video.mkv -map 0:s:0 output.ass

Extract to WebVTT

提取为WebVTT格式

ffmpeg -i video.mkv -map 0:s:0 output.vtt

Extract all subtitle tracks

提取所有字幕轨道

ffmpeg -i video.mkv -map 0:s subs_%d.srt

undefined

ffmpeg -i video.mkv -map 0:s subs_%d.srt

undefined

List Available Subtitle Tracks

列出可用字幕轨道

bash

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bash

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Show all streams including subtitles

显示所有流（包括字幕）

ffprobe -v error -show_entries stream=index,codec_name,codec_type:stream_tags=language,title
-of csv=p=0 video.mkv

Show only subtitle streams

仅显示字幕流

ffprobe -v error -select_streams s
-show_entries stream=index,codec_name:stream_tags=language,title
-of csv=p=0 video.mkv

undefined

ffprobe -v error -select_streams s
-show_entries stream=index,codec_name:stream_tags=language,title
-of csv=p=0 video.mkv

undefined

Convert Subtitle Formats

字幕格式转换

bash

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bash

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SRT to ASS

SRT转ASS

ffmpeg -i subs.srt subs.ass

ASS to SRT (loses styling)

ASS转SRT（丢失样式）

ffmpeg -i subs.ass subs.srt

SRT to WebVTT

SRT转WebVTT

ffmpeg -i subs.srt subs.vtt

WebVTT to SRT

WebVTT转SRT

ffmpeg -i subs.vtt subs.srt

undefined

ffmpeg -i subs.vtt subs.srt

undefined

drawtext Overlays and Whisper AI Integration

drawtext叠加层与Whisper AI集成

Detailed examples for

drawtext

overlays (fonts, positioning, escaping, time expressions, boxes, outlines, animated text) and Whisper AI transcription / subtitle generation workflows live in

references/drawtext-and-whisper.md

. Load that reference when creating burned-in text graphics or generating subtitles from speech.

关于

drawtext

叠加层（字体、定位、转义、时间表达式、方框、轮廓、动态文本）和Whisper AI转录/字幕生成流程的详细示例，请查看

references/drawtext-and-whisper.md

。在创建烧录式文本图形或从语音生成字幕时，请加载该参考文档。

CEA-608/708 Closed Captions

CEA-608/708隐藏式字幕

Extract Closed Captions

提取隐藏式字幕

bash

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bash

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Extract CEA-608 captions from ATSC stream

从ATSC流中提取CEA-608字幕

ffmpeg -f lavfi -i "movie=broadcast.ts[out0+subcc]" -map 0:1 captions.srt

Extract from video with embedded CC

从内嵌字幕的视频中提取

ffmpeg -i video_with_cc.mp4
-filter_complex "[0:v]format=yuv420p[v];[0:v]crop=1:1:0:0[c]"
-map "[c]" -c:v libx264 -f null - 2>&1 | grep -A 1 "Closed caption"

undefined

ffmpeg -i video_with_cc.mp4
-filter_complex "[0:v]format=yuv420p[v];[0:v]crop=1:1:0:0[c]"
-map "[c]" -c:v libx264 -f null - 2>&1 | grep -A 1 "Closed caption"

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Add CEA-608 Captions

添加CEA-608隐藏式字幕

bash

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bash

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Embed CEA-608 captions (requires eia608 line)

嵌入CEA-608字幕（需要eia608线路）

ffmpeg -i video.mp4 -i captions.scc
-c:v libx264 -c:a copy
-vf "movie=captions.scc[captions];[0:v][captions]overlay"
output.mp4

undefined

ffmpeg -i video.mp4 -i captions.scc
-c:v libx264 -c:a copy
-vf "movie=captions.scc[captions];[0:v][captions]overlay"
output.mp4

undefined

Subtitle Positioning

字幕定位

ASS Alignment Values

ASS对齐值

text

7 (top-left)     8 (top-center)     9 (top-right)
4 (mid-left)     5 (mid-center)     6 (mid-right)
1 (bottom-left)  2 (bottom-center)  3 (bottom-right)

text

7（左上）     8（中上）     9（右上）
4（左中）     5（居中）     6（右中）
1（左下）     2（中下）     3（右下）

Position Examples

定位示例

bash

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bash

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Top center subtitles

顶部居中字幕

ffmpeg -i video.mp4
-vf "subtitles=subs.srt:force_style='Alignment=8,MarginV=20'"
output.mp4

Left-aligned subtitles

左对齐字幕

ffmpeg -i video.mp4
-vf "subtitles=subs.srt:force_style='Alignment=1,MarginL=50,MarginV=30'"
output.mp4

Right side for speaker identification

右侧显示用于说话人识别

ffmpeg -i video.mp4
-vf "subtitles=subs.srt:force_style='Alignment=3,MarginR=50'"
output.mp4

undefined

ffmpeg -i video.mp4
-vf "subtitles=subs.srt:force_style='Alignment=3,MarginR=50'"
output.mp4

undefined

Multiple Subtitle Positions

多字幕轨道定位

bash

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bash

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Two subtitle tracks at different positions

两个字幕轨道分别显示在不同位置

ffmpeg -i video.mp4
-vf "[in]subtitles=speaker1.srt:force_style='Alignment=1,MarginL=50'[tmp];
[tmp]subtitles=speaker2.srt:force_style='Alignment=3,MarginR=50'"
output.mp4

undefined

ffmpeg -i video.mp4
-vf "[in]subtitles=speaker1.srt:force_style='Alignment=1,MarginL=50'[tmp];
[tmp]subtitles=speaker2.srt:force_style='Alignment=3,MarginR=50'"
output.mp4

undefined

Batch Processing

批量处理

Burn Subtitles to Multiple Videos

批量给视频硬嵌入字幕

bash

#!/bin/bash

bash

#!/bin/bash

burn_subs_batch.sh

for video in *.mp4; do base="${video%.mp4}" if [ -f "${base}.srt" ]; then ffmpeg -i "$video"
-vf "subtitles=${base}.srt:force_style='FontSize=24,Outline=2'"
-c:a copy
"output/${base}_subbed.mp4" fi done

undefined

for video in *.mp4; do base="${video%.mp4}" if [ -f "${base}.srt" ]; then ffmpeg -i "$video"
-vf "subtitles=${base}.srt:force_style='FontSize=24,Outline=2'"
-c:a copy
"output/${base}_subbed.mp4" fi done

undefined

Convert Subtitle Format Batch

批量转换字幕格式

bash

#!/bin/bash

bash

#!/bin/bash

convert_subs.sh

for srt in *.srt; do base="${srt%.srt}" ffmpeg -i "$srt" "${base}.vtt" done

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for srt in *.srt; do base="${srt%.srt}" ffmpeg -i "$srt" "${base}.vtt" done

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Troubleshooting

故障排除

Common Issues

常见问题

"Unable to find a suitable output format"

bash

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“无法找到合适的输出格式”

bash

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Specify output format explicitly

显式指定输出格式

ffmpeg -i video.mkv -map 0:s:0 -f srt output.srt


**Garbled characters in subtitles**
```bash

ffmpeg -i video.mkv -map 0:s:0 -f srt output.srt


**字幕出现乱码**
```bash

Force UTF-8 encoding

强制使用UTF-8编码

ffmpeg -i video.mp4
-vf "subtitles=subs.srt:charenc=UTF-8"
output.mp4


**Font not found**
```bash

ffmpeg -i video.mp4
-vf "subtitles=subs.srt:charenc=UTF-8"
output.mp4


**找不到字体**
```bash

Specify fonts directory

指定字体目录

ffmpeg -i video.mp4
-vf "subtitles=subs.srt:fontsdir=/path/to/fonts"
output.mp4

List available fonts

列出可用字体

fc-list : family | sort | uniq


**Subtitle timing offset**
```bash

fc-list : family | sort | uniq


**字幕时间轴偏移**
```bash

Delay subtitles by 2 seconds

将字幕延迟2秒

ffmpeg -i video.mp4
-vf "subtitles=subs.srt:itsoffset=2"
output.mp4

Or use setpts to adjust

或使用setpts调整

ffmpeg -i subs.srt -itsoffset 2 delayed.srt


**Subtitle not showing on high-res video**
```bash

ffmpeg -i subs.srt -itsoffset 2 delayed.srt


**高分辨率视频中字幕不显示**
```bash

Scale subtitle rendering to video resolution

根据视频分辨率缩放字幕渲染

ffmpeg -i video_4k.mp4
-vf "subtitles=subs.srt:force_style='FontSize=48,Outline=3'"
output.mp4

undefined

ffmpeg -i video_4k.mp4
-vf "subtitles=subs.srt:force_style='FontSize=48,Outline=3'"
output.mp4

undefined

Verification Commands

验证命令

bash

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bash

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Check if subtitles are present

检查字幕是否存在

ffprobe -v error -select_streams s -show_entries stream=codec_name -of default=nw=1 video.mp4

Count subtitle lines

统计字幕行数

grep -c "^[0-9]" subs.srt

Validate SRT format

验证SRT格式

ffmpeg -i subs.srt -f null -

undefined

ffmpeg -i subs.srt -f null -

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Best Practices

最佳实践

Accessibility

无障碍

Use high contrast colors (white on dark, yellow on dark)
Minimum font size of 24pt for standard video
Include speaker identification for multiple speakers
Position subtitles to avoid obscuring important visual content
Keep lines short (42 characters max per line)
Display duration: minimum 1 second, maximum 7 seconds per caption

使用高对比度颜色（深色背景配白色、深色背景配黄色）
标准视频字幕最小字号为24磅
多说话人场景需添加说话人标识
字幕位置应避免遮挡重要视觉内容
每行字幕长度不超过42个字符
字幕显示时长：每行最少1秒，最多7秒

Quality

质量

Use ASS format for styled subtitles (anime, music videos)
Use SRT for simple dialogue
Use WebVTT for web delivery
Preserve original styling when possible
Test on target devices before distribution

带样式的字幕（动漫、音乐视频）使用ASS格式
简单对话使用SRT格式
网页分发使用WebVTT格式
尽可能保留原始样式
分发前在目标设备上测试

Performance

性能

Burn subtitles only when necessary (streaming, compatibility)
Prefer soft subs for archival and flexibility
Use hardware encoding when burning subtitles to large files
Process in parallel for batch operations

This guide covers FFmpeg subtitle and caption operations. For text overlays with shapes and graphics, see the shapes-graphics skill.

仅在必要时硬嵌入字幕（流媒体、兼容性需求）
存档和灵活处理优先选择软字幕
处理大文件硬嵌入字幕时使用硬件编码
批量操作采用并行处理

本指南涵盖FFmpeg字幕与隐藏式字幕操作。如需添加图形和形状的文本叠加层，请查看shapes-graphics技能文档。

ffmpeg-captions-subtitles

Original

Translation

CRITICAL GUIDELINES

重要指南

Windows File Path Requirements

Windows文件路径要求

Documentation Guidelines

文档规范

Quick Reference

快速参考

When to Use This Skill

适用场景

FFmpeg Captions and Subtitles (2025)

FFmpeg字幕与隐藏式字幕指南（2025版）

Subtitle Format Reference

字幕格式参考

Supported Formats

支持的格式

Format Characteristics

格式特性

Burning Subtitles (Hardcoding)

字幕硬嵌入（烧录）

Basic Subtitle Burn-in

基础字幕硬嵌入

Burn SRT subtitles

硬嵌入SRT字幕

Burn ASS/SSA subtitles (preserves styling)

硬嵌入ASS/SSA字幕（保留样式）

Burn subtitles from MKV container

从MKV容器中硬嵌入字幕

Burn specific subtitle track (index 0)

硬嵌入指定字幕轨道（索引0）

Burn subtitles with stream index

通过流索引硬嵌入字幕

Styled Subtitle Burn-in

带样式的字幕硬嵌入

Force style (overrides subtitle styling)

强制设置样式（覆盖字幕原有样式）

Yellow subtitles with black outline

黄色字幕配黑色轮廓

Larger font for accessibility

大字体适配无障碍需求

ASS Style Parameters

ASS样式参数

Color Format (ASS)

ASS颜色格式

Adding Subtitle Tracks (Soft Subs)

添加字幕轨道（软字幕）

Embed SRT as Track

嵌入SRT作为轨道

Add SRT to MP4 (MOV text)

将SRT嵌入MP4（MOV文本格式）

Add SRT to MKV

将SRT嵌入MKV

Add SRT to WebM (WebVTT)

将SRT嵌入WebM（WebVTT格式）

Multiple Subtitle Tracks

多语言字幕轨道

Add multiple languages

添加多语言字幕

Add ASS subtitles to MKV (preserves styling)

将ASS字幕嵌入MKV（保留样式）

Set Default Subtitle Track

设置默认字幕轨道

Set subtitle as default

设置字幕为默认轨道

Set forced subtitles (always display)

设置强制字幕（始终显示）

Extracting Subtitles

提取字幕

Extract to External File

提取到外部文件

Extract first subtitle track to SRT

提取第一条字幕轨道为SRT格式

Extract specific subtitle stream

提取指定字幕流

Extract to ASS format

提取为ASS格式

Extract to WebVTT