脚本说明#

这是一个跨平台的视频处理工具，能够一键合并视频中的所有音频轨道并重新编码，特别适合处理录播、视频编辑等场景。

系统要求#

依赖软件#

FFmpeg
- Windows：首次运行时脚本会自动下载
- Linux：sudo apt install ffmpeg 或 sudo yum install ffmpeg
- macOS：brew install ffmpeg

硬件加速条件#

Intel QSV：Intel 4代酷睿及以上集显/独显
AMD AMF：AMD Radeon 及以上显卡
NVIDIA NVENC：GTX 600系列及以上显卡
VideoToolbox：Mac 2013年及以后机型

使用方法#

Linux/macOS#

1
# 1. 克隆仓库或下载脚本
2
git clone https://github.com/RolinShmily/SrP-Scripts.git
3
cd SrP-Scripts/video-merge-audio-reencode
4

5
# 2. 赋予执行权限（首次使用）
6
chmod +x video-merge-audio-reencode.sh
7

8
# 3. 运行脚本
9
./video-merge-audio-reencode.sh

Windows#

1
:: 1. 克隆仓库或下载脚本
2
git clone https://github.com/RolinShmily/SrP-Scripts.git
3
cd SrP-Scripts\video-merge-audio-reencode
4

5
:: 2. 双击运行或使用命令行
6
video-merge-audio-reencode.bat

工作流程#

扫描视频文件：递归扫描当前目录下的所有视频文件（支持 mp4、mkv、avi、mov 等常见格式）
检测硬件编码器：自动检测系统可用的硬件编码器，选择最优方案
处理音轨：
- 提取所有音频轨道
- 合并为一个立体声轨道（降混）
重新编码：
- 视频流：使用硬件编码器重新编码为 H.264
- 音频流：重新编码为 AAC
输出文件：在原文件同目录生成 _output.mp4 后缀的新文件

使用示例#

基本使用#

将脚本放入包含视频文件的目录中运行：

1
# 当前目录结构：
2
# ├── video-merge-audio-reencode.sh
3
# ├── 录播1.mkv
4
# ├── 录播2.mp4
5
# └── 子文件夹/
6
#     └── 录播3.avi
7

8
./video-merge-audio-reencode.sh
9

10
# 输出：
11
# ├── 录播1_output.mp4
12
# ├── 录播2_output.mp4
13
# └── 子文件夹/
14
#     └── 录播3_output.mp4

处理单个视频#

如果只想处理特定视频，可以将脚本移动到视频所在目录：

1
# 目录结构：
2
# ├── 我的视频/
3
# │   ├── 原始视频.mkv
4
# │   └── video-merge-audio-reencode.sh
5

6
./video-merge-audio-reencode.sh
7

8
# 输出：原始视频_output.mp4

Batch脚本内容#

1
@echo off
2
REM Video Processing Script (Windows)
3
REM Merge audio tracks and re-encode video to H.264
4
REM Author: RoL1n
5
REM License: MIT
6

7
setlocal enabledelayedexpansion
8

9
cd /d "%~dp0"
10

11
echo Starting video processing script...
12
echo Working directory: %CD%
13
echo.
14

15
REM Check dependencies
16
echo Checking ffmpeg...
17

18
REM Try to find ffmpeg in system PATH
19
set "FFMPEG_PATH="
20
where ffmpeg >nul 2>&1
21
if not errorlevel 1 (
22
    set "FFMPEG_PATH=ffmpeg"
23
    goto :ffmpeg_found
24
)
25

26
REM Check local cache directory
27
set "CACHE_DIR=%USERPROFILE%\.srp-scripts\ffmpeg"
28
set "LOCAL_FFMPEG=%CACHE_DIR%\ffmpeg.exe"
29

30
if exist "%LOCAL_FFMPEG%" (
31
    set "FFMPEG_PATH=%LOCAL_FFMPEG%"
32
    goto :ffmpeg_found
33
)
34

35
REM Download ffmpeg automatically
36
echo ffmpeg not found in system PATH or local cache
37
echo.
38
echo [INFO] Downloading ffmpeg automatically...
39
echo This will only happen once. Future runs will use the cached version.
40
echo.
41

42
REM Create cache directory
43
if not exist "%CACHE_DIR%" mkdir "%CACHE_DIR%"
44

45
REM Download ffmpeg using curl
46
set "DOWNLOAD_URL=https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-essentials.zip"
47
set "ZIP_FILE=%CACHE_DIR%\ffmpeg.zip"
48

49
echo Downloading from: %DOWNLOAD_URL%
50
echo.
51

52
curl -L -o "%ZIP_FILE%" "%DOWNLOAD_URL%"
53
if errorlevel 1 (
54
    echo.
55
    echo [ERROR] Failed to download ffmpeg
56
    echo Please check your internet connection or download manually:
57
    echo %DOWNLOAD_URL%
58
    echo.
59
    pause
60
    exit /b 1
61
)
62

63
echo Download completed. Extracting...
64
echo.
65

66
REM Extract zip to a temporary subfolder
67
set "TEMP_EXTRACT_DIR=%CACHE_DIR%\temp_extract"
68
if exist "%TEMP_EXTRACT_DIR%" rmdir /s /q "%TEMP_EXTRACT_DIR%"
69
mkdir "%TEMP_EXTRACT_DIR%"
70

71
powershell -Command "Expand-Archive -Path '%ZIP_FILE%' -DestinationPath '%TEMP_EXTRACT_DIR%' -Force"
72
if errorlevel 1 (
73
    echo.
74
    echo [ERROR] Failed to extract zip file
75
    del "%ZIP_FILE%"
76
    rmdir /s /q "%TEMP_EXTRACT_DIR%"
77
    pause
78
    exit /b 1
79
)
80

81
REM Find and move ffmpeg binaries from subfolder
82
REM gyan.dev ffmpeg structure: ffmpeg-X.X.X-essentials_build/bin/*.exe
83
for /d %%D in ("%TEMP_EXTRACT_DIR%\*") do (
84
    echo Found ffmpeg folder: %%~nxD
85
    if exist "%%D\bin\ffmpeg.exe" (
86
        echo Found ffmpeg.exe in bin subfolder
87
        move /Y "%%D\bin\*.exe" "%CACHE_DIR%\" >nul
88
        move /Y "%%D\bin\*.dll" "%CACHE_DIR%\" >nul
89
    ) else (
90
        echo Found ffmpeg.exe in root folder
91
        move /Y "%%D\*.exe" "%CACHE_DIR%\" >nul
92
        move /Y "%%D\*.dll" "%CACHE_DIR%\" >nul
93
    )
94
)
95

96
REM Cleanup
97
del "%ZIP_FILE%" 2>nul
98
rmdir /s /q "%TEMP_EXTRACT_DIR%" 2>nul
99

100
REM Verify extraction
101
if not exist "%LOCAL_FFMPEG%" (
102
    echo.
103
    echo [ERROR] Failed to extract ffmpeg
104
    echo ffmpeg.exe not found at: %LOCAL_FFMPEG%
105
    echo.
106
    echo Contents of cache directory:
107
    dir /b "%CACHE_DIR%"
108
    echo.
109
    pause
110
    exit /b 1
111
)
112

113
echo ffmpeg installed successfully to: %CACHE_DIR%
114
echo.
115
echo [INFO] Verifying ffmpeg...
116
"%LOCAL_FFMPEG%" -version | findstr "ffmpeg version"
117
echo.
118
echo [INFO] You can delete this cache anytime to reclaim space:
119
echo   %CACHE_DIR%
120
echo.
121

122
:ffmpeg_found
123
echo [OK] ffmpeg found
124
echo [INFO] Using ffmpeg at: %FFMPEG_PATH%
125
echo.
126

127
REM Set ffprobe path based on ffmpeg location
128
set "FFPROBE_PATH="
129
if "%FFMPEG_PATH%"=="ffmpeg" (
130
    set "FFPROBE_PATH=ffprobe"
131
) else (
132
    set "FFPROBE_PATH=%FFMPEG_PATH:\ffmpeg.exe=\ffprobe.exe%"
133
)
134

135
REM Verify ffprobe exists
136
if not "%FFPROBE_PATH%"=="ffprobe" (
137
    if not exist "%FFPROBE_PATH%" (
138
        echo [WARN] ffprobe not found at: %FFPROBE_PATH%
139
        echo [INFO] Will try to use ffprobe from PATH
140
        set "FFPROBE_PATH=ffprobe"
141
    )
142
)
143

144
echo [INFO] Using ffprobe at: %FFPROBE_PATH%
145
echo.
146

147
REM Create output directory
148
if not exist "output" mkdir "output"
149

150
REM Find video files
151
echo Scanning for video files...
152

153
set COUNT=0
154
for %%F in (*.mkv *.mov *.mp4) do set /a COUNT+=1
155

156
for /d %%D in (*) do (
157
    if /i not "%%D"=="output" (
158
        for %%F in ("%%D\*.mkv" "%%D\*.mov" "%%D\*.mp4") do (
159
            if exist "%%F" set /a COUNT+=1
160
        )
161
    )
162
)
163

164
echo Found %COUNT% video file(s)
165
echo.
166

167
if %COUNT%==0 (
168
    echo [ERROR] No video files found
169
    pause
170
    exit /b 1
171
)
172

173
REM Detect encoder
174
set "HW_ENCODER=libx264"
175
echo Detecting encoder...
176

177
"%FFMPEG_PATH%" -hide_banner -encoders 2>nul | findstr /C:"h264_nvenc" >nul
178
if !errorlevel! equ 0 (
179
    set "HW_ENCODER=h264_nvenc"
180
    echo   Using: NVIDIA NVENC
181
)
182

183
if "!HW_ENCODER!"=="libx264" (
184
    "%FFMPEG_PATH%" -hide_banner -encoders 2>nul | findstr /C:"h264_amf" >nul
185
    if !errorlevel! equ 0 (
186
        set "HW_ENCODER=h264_amf"
187
        echo   Using: AMD AMF
188
    )
189
)
190

191
if "!HW_ENCODER!"=="libx264" (
192
    "%FFMPEG_PATH%" -hide_banner -encoders 2>nul | findstr /C:"h264_qsv" >nul
193
    if !errorlevel! equ 0 (
194
        set "HW_ENCODER=h264_qsv"
195
        echo   Using: Intel Quick Sync
196
    )
197
)
198

199
if "!HW_ENCODER!"=="libx264" echo   Using: CPU (libx264)
200
echo.
201

202
REM Process videos in current directory
203
set SUCCESS=0
204
set FAIL=0
205

206
for %%F in (*.mkv *.mov *.mp4) do (
207
    set "INPUT_FILE=%%F"
208
    set "FILENAME=%%~nxF"
209
    set "OUTPUT_FILE=output\%%~nF.mp4"
210

211
    echo [INFO] Processing: !FILENAME!
212

213
    REM Get audio count
214
    "%FFPROBE_PATH%" -v error -select_streams a -show_entries stream=codec_type -of csv=p=0 "!INPUT_FILE!" 2>nul > "%TEMP%\audio_tmp.txt"
215
    for /f %%A in ('type "%TEMP%\audio_tmp.txt" ^| find /c /v ""') do set AUDIO_COUNT=%%A
216
    del "%TEMP%\audio_tmp.txt" 2>nul
217
    echo   Audio tracks: !AUDIO_COUNT!
218

219
    REM Get bitrate
220
    "%FFPROBE_PATH%" -v error -select_streams v:0 -show_entries stream=bit_rate -of default=noprint_wrappers=1:nokey=1 "!INPUT_FILE!" 2>nul > "%TEMP%\bitrate_tmp.txt"
221
    set /p SOURCE_BITRATE=<"%TEMP%\bitrate_tmp.txt"
222
    del "%TEMP%\bitrate_tmp.txt" 2>nul
223
    if "!SOURCE_BITRATE!"=="" set SOURCE_BITRATE=0
224

225
    REM Calculate target bitrate
226
    set TARGET_BITRATE=0
227
    if !SOURCE_BITRATE! GTR 0 (
228
        set /a TARGET_BITRATE=!SOURCE_BITRATE!/1000
229
        echo   Source bitrate: !TARGET_BITRATE! kbps
230
    )
231

232
    REM Build encoding parameters
233
    set CRF_VALUE=23
234
    if !TARGET_BITRATE! GTR 0 (
235
        if !TARGET_BITRATE! LSS 2000 set CRF_VALUE=20
236
    )
237

238
    REM Set video params based on encoder
239
    if "!HW_ENCODER!"=="h264_nvenc" (
240
        REM Use simple NVENC params for compatibility with older ffmpeg
241
        if !TARGET_BITRATE! GTR 0 (
242
            set "VIDEO_PARAMS=-c:v h264_nvenc -preset fast -cq !CRF_VALUE! -b:v !TARGET_BITRATE!k -maxrate !TARGET_BITRATE!k"
243
        ) else (
244
            set "VIDEO_PARAMS=-c:v h264_nvenc -preset fast -cq !CRF_VALUE!"
245
        )
246
    ) else if "!HW_ENCODER!"=="h264_amf" (
247
        if !TARGET_BITRATE! GTR 0 (
248
            set /a BUF_SIZE=!TARGET_BITRATE!*2
249
            set "VIDEO_PARAMS=-c:v h264_amf -quality speed -rc vbr -b:v !TARGET_BITRATE!k -maxrate !TARGET_BITRATE!k -bufsize !BUF_SIZE!k"
250
        ) else (
251
            set "VIDEO_PARAMS=-c:v h264_amf -quality speed -rc vbr"
252
        )
253
    ) else if "!HW_ENCODER!"=="h264_qsv" (
254
        if !TARGET_BITRATE! GTR 0 (
255
            set /a BUF_SIZE=!TARGET_BITRATE!*2
256
            set "VIDEO_PARAMS=-c:v h264_qsv -preset medium -b:v !TARGET_BITRATE!k -maxrate !TARGET_BITRATE!k -bufsize !BUF_SIZE!k -global_quality !CRF_VALUE!"
257
        ) else (
258
            set "VIDEO_PARAMS=-c:v h264_qsv -preset medium -global_quality !CRF_VALUE!"
259
        )
260
    ) else (
261
        if !TARGET_BITRATE! GEQ 2000 (
262
            set /a BUF_SIZE=!TARGET_BITRATE!*2
263
            set "VIDEO_PARAMS=-c:v libx264 -preset medium -b:v !TARGET_BITRATE!k -maxrate !TARGET_BITRATE!k -bufsize !BUF_SIZE!k"
264
        ) else (
265
            set "VIDEO_PARAMS=-c:v libx264 -preset medium -crf !CRF_VALUE!"
266
        )
267
    )
268

269
    set "AUDIO_PARAMS=-c:a aac -b:a 192k -ac 2"
270

271
    echo   Encoding...
272

273
    REM Execute ffmpeg with output visible for debugging
274
    if !AUDIO_COUNT! GTR 1 (
275
        "%FFMPEG_PATH%" -i "!INPUT_FILE!" -filter_complex "amix=inputs=!AUDIO_COUNT!:duration=longest[a]" -map 0:v -map "[a]" !VIDEO_PARAMS! !AUDIO_PARAMS! -movflags +faststart -y "!OUTPUT_FILE!"
276
    ) else (
277
        "%FFMPEG_PATH%" -i "!INPUT_FILE!" !VIDEO_PARAMS! !AUDIO_PARAMS! -movflags +faststart -y "!OUTPUT_FILE!"
278
    )
279

280
    REM Check output
281
    if exist "!OUTPUT_FILE!" (
282
        for %%S in ("!OUTPUT_FILE!") do set FILE_SIZE=%%~zS
283
        if !FILE_SIZE! GTR 0 (
284
            echo   Done
285
            set /a SUCCESS+=1
286
        ) else (
287
            echo   Failed: Output file is empty
288
            set /a FAIL+=1
289
        )
290
    ) else (
291
        echo   Failed: Output file not created
292
        set /a FAIL+=1
293
    )
294
    echo.
295
)
296

297
REM Process subdirectories (excluding output)
298
for /d %%D in (*) do (
299
    if /i not "%%D"=="output" (
300
        pushd "%%D"
301
        for %%F in (*.mkv *.mov *.mp4) do (
302
            set "INPUT_FILE=%%F"
303
            set "FILENAME=%%~nxF"
304
            set "OUTPUT_FILE=..\output\%%~nF.mp4"
305

306
            echo [INFO] Processing: %%D\!FILENAME!
307

308
            REM Get audio count
309
            "%FFPROBE_PATH%" -v error -select_streams a -show_entries stream=codec_type -of csv=p=0 "!INPUT_FILE!" 2>nul > "%TEMP%\audio_tmp.txt"
310
            for /f %%A in ('type "%TEMP%\audio_tmp.txt" ^| find /c /v ""') do set AUDIO_COUNT=%%A
311
            del "%TEMP%\audio_tmp.txt" 2>nul
312
            echo   Audio tracks: !AUDIO_COUNT!
313

314
            REM Get bitrate
315
            "%FFPROBE_PATH%" -v error -select_streams v:0 -show_entries stream=bit_rate -of default=noprint_wrappers=1:nokey=1 "!INPUT_FILE!" 2>nul > "%TEMP%\bitrate_tmp.txt"
316
            set /p SOURCE_BITRATE=<"%TEMP%\bitrate_tmp.txt"
317
            del "%TEMP%\bitrate_tmp.txt" 2>nul
318
            if "!SOURCE_BITRATE!"=="" set SOURCE_BITRATE=0
319

320
            REM Calculate target bitrate
321
            set TARGET_BITRATE=0
322
            if !SOURCE_BITRATE! GTR 0 (
323
                set /a TARGET_BITRATE=!SOURCE_BITRATE!/1000
324
                echo   Source bitrate: !TARGET_BITRATE! kbps
325
            )
326

327
            REM Build encoding parameters
328
            set CRF_VALUE=23
329
            if !TARGET_BITRATE! GTR 0 (
330
                if !TARGET_BITRATE! LSS 2000 set CRF_VALUE=20
331
            )
332

333
            REM Set video params based on encoder
334
            if "!HW_ENCODER!"=="h264_nvenc" (
335
                if !TARGET_BITRATE! GTR 0 (
336
                    set /a BUF_SIZE=!TARGET_BITRATE!*2
337
                    set "VIDEO_PARAMS=-c:v h264_nvenc -preset p4 -rc vbr -b:v !TARGET_BITRATE!k -maxrate !TARGET_BITRATE!k -bufsize !BUF_SIZE!k -cq !CRF_VALUE!"
338
                ) else (
339
                    set "VIDEO_PARAMS=-c:v h264_nvenc -preset p4 -rc vbr -cq !CRF_VALUE!"
340
                )
341
            ) else if "!HW_ENCODER!"=="h264_amf" (
342
                if !TARGET_BITRATE! GTR 0 (
343
                    set /a BUF_SIZE=!TARGET_BITRATE!*2
344
                    set "VIDEO_PARAMS=-c:v h264_amf -quality speed -rc vbr -b:v !TARGET_BITRATE!k -maxrate !TARGET_BITRATE!k -bufsize !BUF_SIZE!k"
345
                ) else (
346
                    set "VIDEO_PARAMS=-c:v h264_amf -quality speed -rc vbr"
347
                )
348
            ) else if "!HW_ENCODER!"=="h264_qsv" (
349
                if !TARGET_BITRATE! GTR 0 (
350
                    set /a BUF_SIZE=!TARGET_BITRATE!*2
351
                    set "VIDEO_PARAMS=-c:v h264_qsv -preset medium -b:v !TARGET_BITRATE!k -maxrate !TARGET_BITRATE!k -bufsize !BUF_SIZE!k -global_quality !CRF_VALUE!"
352
                ) else (
353
                    set "VIDEO_PARAMS=-c:v h264_qsv -preset medium -global_quality !CRF_VALUE!"
354
                )
355
            ) else (
356
                if !TARGET_BITRATE! GEQ 2000 (
357
                    set /a BUF_SIZE=!TARGET_BITRATE!*2
358
                    set "VIDEO_PARAMS=-c:v libx264 -preset medium -b:v !TARGET_BITRATE!k -maxrate !TARGET_BITRATE!k -bufsize !BUF_SIZE!k"
359
                ) else (
360
                    set "VIDEO_PARAMS=-c:v libx264 -preset medium -crf !CRF_VALUE!"
361
                )
362
            )
363

364
            set "AUDIO_PARAMS=-c:a aac -b:a 192k -ac 2"
365

366
            echo   Encoding...
367

368
            REM Execute ffmpeg
369
            if !AUDIO_COUNT! GTR 1 (
370
                "%FFMPEG_PATH%" -i "!INPUT_FILE!" -filter_complex "amix=inputs=!AUDIO_COUNT!:duration=longest[a]" -map 0:v -map "[a]" !VIDEO_PARAMS! !AUDIO_PARAMS! -movflags +faststart -y "!OUTPUT_FILE!"
371
            ) else (
372
                "%FFMPEG_PATH%" -i "!INPUT_FILE!" !VIDEO_PARAMS! !AUDIO_PARAMS! -movflags +faststart -y "!OUTPUT_FILE!"
373
            )
374

375
            REM Check output
376
            if exist "!OUTPUT_FILE!" (
377
                for %%S in ("!OUTPUT_FILE!") do set FILE_SIZE=%%~zS
378
                if !FILE_SIZE! GTR 0 (
379
                    echo   Done
380
                    set /a SUCCESS+=1
381
                ) else (
382
                    echo   Failed: Output file is empty
383
                    set /a FAIL+=1
384
                )
385
            ) else (
386
                echo   Failed: Output file not created
387
                set /a FAIL+=1
388
            )
389
            echo.
390
        )
391
        popd
392
    )
393
)
394

395
echo ===================================
396
echo Processing completed!
397
echo   Success: %SUCCESS%
398
echo   Failed: %FAIL%
399
echo   Total: %COUNT%
400
echo ===================================
401
echo.
402
endlocal
403
pause