一、前置操作 ( 移植 FFMPEG )

参考【Android FFMPEG 开发】Android 中执行 FFMPEG 指令博客 ;

在应用的 build.gradle 构建脚本中导入如下依赖 ;

dependencies {     implementation 'com.writingminds:FFmpegAndroid:0.3.2'}

然后按照【Android FFMPEG 开发】Android 中执行 FFMPEG 指令二、Android 中执行 FFMPEG 指令中的流程进行开发 , 将拼接好的 FFMPEG 指令传入 ffmpeg.execute 方法 ;

二、FFMPEG 混音命令

FFMPEG 混音命令 :

ffmpeg -i 输入文件1 -i 输入文件2 -i 输入文件3 -filter_complex amix=inputs=输入文件个数:duration=混音时间对齐策略:dropout_transition=声音渐弱时间 输出文件

-i : 输入文件的完整绝对路径 ;

amix=inputs=2 : 表示混音文件个数 , 有 $2$ 个文件进行混音 ;

duration=longest : 设置混音时间对齐策略 , longest 表示最长的音频文件持续时间 , shortest 表示最短输入的持续时间 , first 表示第一个文件的持续时间 ;

dropout_transition=2 : 表示输入流结束时 , 音量从满音量到 $0$ 音量渐弱 $2$ 秒消失 ;

Android 中的完整命令 :

-i /data/user/0/com.example.ffmpeg_mix/files/BeardedGrain.mp3 -i /data/user/0/com.example.ffmpeg_mix/files/RainyDay.mp3 -filter_complex amix=inputs=2:duration=longest:dropout_transition=2 /data/user/0/com.example.ffmpeg_mix/files/Mix.mp3

第 $1$ 个输入文件是 /data/user/0/com.example.ffmpeg_mix/files/BeardedGrain.mp3 ;

第 $2$ 个输入文件是 /data/user/0/com.example.ffmpeg_mix/files/RainyDay.mp3 ;

amix=inputs=2 表示当前有 $2$ 个输入文件 ;

duration=longest 表示混音时间是最长输入持续时间 ;

dropout_transition=2 表示输入流结束时 , 音量从满音量到 $0$ 音量渐弱 $2$ 秒消失 ;

最后混音的输出文件是 /data/user/0/com.example.ffmpeg_mix/files/Mix.mp3 ;

命令分行注释 :

-i /data/user/0/com.example.ffmpeg_mix/files/BeardedGrain.mp3 // 输入文件 1-i /data/user/0/com.example.ffmpeg_mix/files/RainyDay.mp3 // 输入文件 2-filter_complex amix=inputs=2:duration=longest:dropout_transition=2 // 混音参数/data/user/0/com.example.ffmpeg_mix/files/Mix.mp3 // 输出文件

三、Android FFMPEG 混音源代码完整示例

Android FFMPEG 混音源代码完整示例 :

package com.example.ffmpeg_miximport android.os.Bundleimport android.util.Logimport android.view.Viewimport android.widget.TextViewimport androidx.appcompat.app.AppCompatActivityimport com.github.hiteshsondhi88.libffmpeg.ExecuteBinaryResponseHandlerimport com.github.hiteshsondhi88.libffmpeg.FFmpegimport com.github.hiteshsondhi88.libffmpeg.LoadBinaryResponseHandlerimport java.io.Fileclass MainActivity : AppCompatActivity() {         val TAG = "MainActivity"    /**     * 应用内置存储下的 files 目录     */    lateinit var mFilePath: String    lateinit var ffmpeg: FFmpeg    override fun onCreate(savedInstanceState: Bundle?) {             super.onCreate(savedInstanceState)        setContentView(R.layout.activity_main)        mFilePath = this.filesDir.toString()        // 初始化 FFMPEG        ffmpeg = FFmpeg.getInstance(this)        // 加载 FFMPEG 可执行文件        ffmpeg.loadBinary(LoadBinaryResponseHandler())    }    /**     * 拷贝文件     */    fun copy(view: View) {             CommandUtils.copyAssets2File(            this,            "BeardedGrain.mp3",            "${mFilePath}/BeardedGrain.mp3")        CommandUtils.copyAssets2File(            this,            "RainyDay.mp3",            "${mFilePath}/RainyDay.mp3")        showText()    }    /**     * 执行混音命令     */    fun mix(view: View) {             var cmd = "-i ${mFilePath}/BeardedGrain.mp3 -i ${mFilePath}/RainyDay.mp3 -filter_complex amix=inputs=2:duration=longest:dropout_transition=2 ${mFilePath}/Mix.mp3"        Log.i(TAG, "执行命令 : $cmd")        var cmdArraay = cmd.split(" ").toTypedArray();        ffmpeg.execute(cmdArraay, object : ExecuteBinaryResponseHandler(){                 override fun onStart() {                     super.onStart()                Log.i(TAG, "onStart")            }            override fun onFinish() {                     super.onFinish()                Log.i(TAG, "onStart")                showText()            }            override fun onSuccess(message: String?) {                     super.onSuccess(message)                Log.i(TAG, "onSuccess : $message")            }            override fun onProgress(message: String?) {                     super.onProgress(message)                Log.i(TAG, "onProgress : $message")            }            override fun onFailure(message: String?) {                     super.onFailure(message)                Log.i(TAG, "onFailure : $message")            }        })    }    /**     * 显示内置存储目录     */    fun showText(){             var fileString = ""        var files = File(mFilePath).listFiles()        files.forEach {                 fileString += "${it}\n"        }        findViewById<TextView>(R.id.text).text = fileString    }}

执行结果 : 这是混音正确的输出内容 ;

执行命令 : -i /data/user/0/com.example.ffmpeg_mix/files/BeardedGrain.mp3 -i /data/user/0/com.example.ffmpeg_mix/files/RainonStartonProgress : ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developersonProgress :   built with gcc 4.8 (GCC)onProgress :   configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-androonProgress :   libavutil      55. 17.103 / 55. 17.103onProgress :   libavcodec     57. 24.102 / 57. 24.102onProgress :   libavformat    57. 25.100 / 57. 25.100onProgress :   libavdevice    57.  0.101 / 57.  0.101onProgress :   libavfilter     6. 31.100 /  6. 31.100onProgress :   libswscale      4.  0.100 /  4.  0.100onProgress :   libswresample   2.  0.101 /  2.  0.101onProgress :   libpostproc    54.  0.100 / 54.  0.100onProgress : [mp3 @ 0xe8230000] Skipping 0 bytes of junk at 51635.onProgress : [mjpeg @ 0xe80af400] Changing bps to 8onProgress : Input #0, mp3, from '/data/user/0/com.example.ffmpeg_mix/files/BeardedGrain.mp3':onProgress :   Metadata:onProgress :     encoder         : Lavf57.83.100onProgress :     album           : 芒种onProgress :     title           : 芒种onProgress :     artist          : 步束onProgress :     disc            : 01onProgress :     track           : 1onProgress :   Duration: 00:03:35.48, start: 0.025056, bitrate: 321 kb/sonProgress :     Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/sonProgress :     Metadata:onProgress :       encoder         : Lavc57.10onProgress :     Stream #0:1: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 640x640 [SAR 72:72 DAR 1:1], 90k tbonProgress :     Metadata:onProgress :       comment         : Media (e.g. label side of CD)onProgress : [mp3 @ 0xe8230600] Skipping 0 bytes of junk at 18961.onProgress : [mjpeg @ 0xe80b0400] Changing bps to 8onProgress : Input #1, mp3, from '/data/user/0/com.example.ffmpeg_mix/files/RainyDay.mp3':onProgress :   Metadata:onProgress :     encoder         : Lavf57.83.100onProgress :   Duration: 00:04:25.85, start: 0.025056, bitrate: 320 kb/sonProgress :     Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/sonProgress :     Metadata:onProgress :       encoder         : Lavc57.10onProgress :     Stream #1:1: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 640x640 [SAR 72:72 DAR 1:1], 90k tbonProgress :     Metadata:onProgress :       comment         : Media (e.g. label side of CD)onProgress : [swscaler @ 0xe7f21000] deprecated pixel format used, make sure you did set range correctlyonProgress : [swscaler @ 0xe7f21000] No accelerated colorspace conversion found from yuv420p to rgb24.onProgress : [mp3 @ 0xe8230c00] Frame rate very high for a muxer not efficiently supporting it.onProgress : Please consider specifying a lower framerate, a different muxer or -vsync 2onProgress : Output #0, mp3, to '/data/user/0/com.example.ffmpeg_mix/files/Mix.mp3':onProgress :   Metadata:onProgress :     Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp (default)onProgress :     Metadata:onProgress :       encoder         : Lavc57.24.102 libmp3lameonProgress :     Stream #0:1: Video: png, rgb24, 640x640 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 90k fps, 90k tbn, 90k tbonProgress :     Metadata:onProgress :       comment         : Media (e.g. label side of CD)onProgress :       encoder         : Lavc57.24.102 pngonProgress : Stream mapping:onProgress :   Stream #0:0 (mp3) -> amix:input0 (graph 0)onProgress :   Stream #1:0 (mp3) -> amix:input1 (graph 0)onProgress :   amix (graph 0) -> Stream #0:0 (libmp3lame)onProgress :   Stream #0:1 -> #0:1 (mjpeg (native) -> png (native))onProgress : Press [q] to stop, [?] for helponProgress : frame=    1 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate= 870.5kbits/s speed=0.00213x    onProgress : frame=    1 fps=0.0 q=0.0 size=       0kB time=00:03:31.41 bitrate=   0.0kbits/s speed=3.25x    onProgress : frame=    1 fps=0.0 q=0.0 size=       0kB time=00:03:33.00 bitrate=   0.0kbits/s speed=3.25x    onProgress : frame=    1 fps=0.0 q=0.0 size=       0kB time=00:03:34.57 bitrate=   0.0kbits/s speed=3.25x    onProgress : Error while filtering: Out of memoryonProgress : frame=    1 fps=0.0 q=-0.0 Lsize=    3995kB time=00:03:35.45 bitrate= 151.9kbits/s speed=3.25x    onProgress : video:628kB audio:3367kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.008727%onSuccess : ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers      built with gcc 4.8 (GCC)      configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=      libavutil      55. 17.103 / 55. 17.103      libavcodec     57. 24.102 / 57. 24.102      libavformat    57. 25.100 / 57. 25.100      libavdevice    57.  0.101 / 57.  0.101      libavfilter     6. 31.100 /  6. 31.100      libswscale      4.  0.100 /  4.  0.100      libswresample   2.  0.101 /  2.  0.101      libpostproc    54.  0.100 / 54.  0.100    [mp3 @ 0xe8230000] Skipping 0 bytes of junk at 51635.    [mjpeg @ 0xe80af400] Changing bps to 8    Input #0, mp3, from '/data/user/0/com.example.ffmpeg_mix/files/BeardedGrain.mp3':      Metadata:      Duration: 00:03:35.48, start: 0.025056, bitrate: 321 kb/s        Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s        Metadata:          encoder         : Lavc57.10        Stream #0:1: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 640x640 [SAR 72:72 DAR 1:1], 90k tbr, 90k tbn, 90k tbc        Metadata:          comment         : Media (e.g. label side of CD)    [mp3 @ 0xe8230600] Skipping 0 bytes of junk at 18961.    [mjpeg @ 0xe80b0400] Changing bps to 8    Input #1, mp3, from '/data/user/0/com.example.ffmpeg_mix/files/RainyDay.mp3':      Metadata:        encoder         : Lavf57.83.100      Duration: 00:04:25.85, start: 0.025056, bitrate: 320 kb/s        Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s        Metadata:          encoder         : Lavc57.10        Stream #1:1: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 640x640 [SAR 72:72 DAR 1:1], 90k tbr, 90k tbn, 90k tbc        Metadata:          comment         : Media (e.g. label side of CD)    [swscaler @ 0xe7f21000] deprecated pixel format used, make sure you did set range correctly    [swscaler @ 0xe7f21000] No accelerated colorspace conversion found from yuv420p to rgb24.    [mp3 @ 0xe8230c00] Frame rate very high for a muxer not efficiently supporting it.    Please consider specifying a lower framerate, a different muxer or -vsync 2    Output #0, mp3, to '/data/user/0/com.example.ffmpeg_mix/files/Mix.mp3':      Metadata:        Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp (default)        Metadata:          encoder         : Lavc57.24.102 libmp3lame        Stream #0:1: Video: png, rgb24, 640x640 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 90k fps, 90k tbn, 90k tbc        Metadata:          comment         : Media (e.g. label side of CD)          encoder         : Lavc57.24.102 png    Stream mapping:      Stream #0:0 (mp3) -> amix:input0 (graph 0)      Stream #1:0 (mp3) -> amix:input1 (graph 0)      amix (graph 0) -> Stream #0:0 (libmp3lame)      Str2021-06-03 20:16:57.824 30155-30155/com.example.ffmpeg_mix I/MainActivity: onStart

文件内容 : ffmpeg 是可执行文件 , Mix.mp3 是由其余两个 mp3 文件混音而来的 ;

四、博客源码

博客源码 :

GitHub : https://github.com/han1202012/FFMPEG_MIX
CSDN : https://download.csdn.net/download/han1202012/19372874

【Android(安卓)FFMPEG 开发】Android(安卓)中使用 FFMPEG 对 MP3 文件进行混音操作

文章目录

一、前置操作 ( 移植 FFMPEG )

二、FFMPEG 混音命令

三、Android FFMPEG 混音源代码完整示例

四、博客源码

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