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Android 使用FFmpeg3.3.9基于命令实现视频压缩

發(fā)布時(shí)間：2023/12/3 Android 62 豆豆

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前言

首先利用linux平臺(tái)編譯ffmpeg的so庫，具體詳情請(qǐng)查看文章：Android NDK(ndk-r16b)交叉編譯FFmpeg(3.3.9)_jszlittlecat_720的博客-CSDN博客

1.創(chuàng)建VideoCompress類

package com.suoer.ndk.ffmpegtestapplication;public class VideoCompress {/*** compressVideo native 方法* @param compressCommand 壓縮命令* @param callback 壓縮回調(diào)*/public native void compressVideo(String[] compressCommand,CompressCallback callback);//CompressCallback 壓縮回調(diào)public interface CompressCallback{/*** onCompress* @param current 壓縮的當(dāng)前進(jìn)度* @param total 總進(jìn)度*/public void onCompress(int current,int total);} } compressVideo報(bào)紅，鼠標(biāo)停在上面，左邊會(huì)出現(xiàn)紅色小燈泡，點(diǎn)擊紅色小燈泡

?點(diǎn)擊Create JNI function for compressVideo

自動(dòng)打開native-lib.cpp并創(chuàng)建完成Java_com_suoer_ndk_ffmpegtestapplication_VideoCompress_compressVideo 方法

?在此方法下實(shí)現(xiàn)壓縮視頻

2.MainActivity實(shí)現(xiàn)點(diǎn)擊TextView實(shí)現(xiàn)壓縮視頻

2.1權(quán)限問題處理

壓縮視頻需要讀寫文件的權(quán)限

打開AndroidManifest.xml

添加讀寫文件權(quán)限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>

?權(quán)限處理使用rxpermissions

rxpermissions github地址：GitHub - tbruyelle/RxPermissions: Android runtime permissions powered by RxJava2

rxpermissions使用方式

打開項(xiàng)目下的build.gradle添加如下代碼：

maven { url 'https://jitpack.io' }

?打開app下的build.gradle添加如下代碼：

implementation 'com.github.tbruyelle:rxpermissions:0.12'

?點(diǎn)擊同步按鈕，同步文件

?2.2子線程處理耗時(shí)操作

壓縮視頻是耗時(shí)操作，子線程處理耗時(shí)操作。

使用rxandroid實(shí)現(xiàn)子線程耗時(shí)操作并實(shí)現(xiàn)子線程和主線程切換

rxandroid github地址：GitHub - ReactiveX/RxAndroid: RxJava bindings for Android

?rxandroid使用方式：

打開項(xiàng)目下的build.gradle添加如下代碼：

maven { url "https://oss.jfrog.org/libs-snapshot" }

?打開app下的build.gradle添加如下代碼：

implementation 'io.reactivex.rxjava3:rxandroid:3.0.0'

?點(diǎn)擊同步按鈕同步文件

MainActivity.java內(nèi)容如下：

package com.suoer.ndk.ffmpegtestapplication;import android.Manifest; import android.os.Bundle; import android.os.Environment; import android.util.Log; import android.view.View; import android.widget.TextView;import com.tbruyelle.rxpermissions3.RxPermissions;import java.io.File;import androidx.appcompat.app.AppCompatActivity; import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers; import io.reactivex.rxjava3.core.Observable; import io.reactivex.rxjava3.functions.Consumer; import io.reactivex.rxjava3.functions.Function; import io.reactivex.rxjava3.schedulers.Schedulers;public class MainActivity extends AppCompatActivity {private File mInFile=new File(Environment.getExternalStorageDirectory(),"test.mp4");//mInFile 需要壓縮的文件路徑private File mOutFile=new File(Environment.getExternalStorageDirectory(),"out.mp4");//mOutFile壓縮后的文件路徑// Used to load the 'native-lib' library on application startup.static {System.loadLibrary("native-lib");}@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);// Example of a call to a native methodTextView tv = findViewById(R.id.sample_text);//tv.setText("ffmpeg版本："+stringFromJNI());tv.setText("壓縮");//tv的點(diǎn)擊事件點(diǎn)擊按鈕實(shí)現(xiàn)視頻壓縮tv.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// 壓縮文件需要讀寫文件權(quán)限申請(qǐng)權(quán)限RxPermissions rxPermissions=new RxPermissions(MainActivity.this);rxPermissions.request(Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE).subscribe(new Consumer<Boolean>() {@Overridepublic void accept(Boolean aBoolean) throws Throwable {if(aBoolean){//權(quán)限已經(jīng)獲取壓縮視頻compressVideo();}}});}});}/*** 開啟子線程處理耗時(shí)壓縮問題*/private void compressVideo() {//ffmpeg的壓縮命令:ffmpeg -i test.mp4 -b:v 1024k out.mp4//ffmpeg -i test.mp4 -b:v 1024k out.mp4//-b:v 1024k 1024k為碼率碼率越高視頻越清晰，而且視頻越大//test.mp4需要壓縮的文件//out.mp4 壓縮之后的文件String[] compressCommand={"ffmpeg","-i",mInFile.getAbsolutePath(),"-b:v","1024k",mOutFile.getAbsolutePath()};//壓縮是耗時(shí)的，需要子線程處理Observable.just(compressCommand).map(new Function<String[], File>() {@Overridepublic File apply(String[] compressCommand) throws Throwable {VideoCompress videoCompress=new VideoCompress();videoCompress.compressVideo(compressCommand, new VideoCompress.CompressCallback() {@Overridepublic void onCompress(int current, int total) {Log.e("TAG", "onCompress: 壓縮進(jìn)度:"+current+"/"+total);}});return mOutFile;}}).subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()).subscribe(new Consumer<File>() {@Overridepublic void accept(File file) throws Throwable {//壓縮完成Log.e("TAG", "accept: 壓縮完成！" );}});}/*** A native method that is implemented by the 'native-lib' native library,* which is packaged with this application.*/public native String stringFromJNI(); }

3.拷貝視頻壓縮使用命令實(shí)現(xiàn)需要的其他文件

include目錄下創(chuàng)建compat文件夾把所需要的頭文件?os2threads.h?va_copy.h?w32pthreads.h拷貝此文件夾中

這三個(gè)頭文件存在于下載之后的ffmpeg-3.3.9.tar.gz解壓之后的文件夾ffmpeg-3.3.9的compat文件夾中

?在jniLibs文件夾中創(chuàng)建other文件夾

?拷貝linux平臺(tái)編譯后的文件cmdutils.h cmdutils_common_opts.h config.h ffmpeg.h 拷貝至other文件夾中

?將下載之后的ffmpeg-3.3.9.tar.gz解壓之后的文件夾ffmpeg-3.3.9中的cmdutils.c?

ffmpeg.c?ffmpeg_filter.c?ffmpeg_opt.c 四個(gè)文件拷貝至cpp文件夾中

?配置CMakeLists.txt文件修改如下內(nèi)容

?CMakeLists.txt內(nèi)容如下：

# For more information about using CMake with Android Studio, read the # documentation: https://d.android.com/studio/projects/add-native-code.html# Sets the minimum version of CMake required to build the native library.cmake_minimum_required(VERSION 3.10.2)# Declares and names the project.project("ffmpegtestapplication")#判斷編譯器類型,如果是gcc編譯器,則在編譯選項(xiàng)中加入c++11支持 if(CMAKE_COMPILER_IS_GNUCXX)set(CMAKE_CXX_FLAGS "-std=c++11 ${CMAKE_CXX_FLAGS}")message(STATUS "optional:-std=c++11") endif(CMAKE_COMPILER_IS_GNUCXX)#需要引入我們頭文件，以這個(gè)配置的目錄為基準(zhǔn)include_directories(${CMAKE_SOURCE_DIR}/../jniLibs/include) include_directories(${CMAKE_SOURCE_DIR}/../jniLibs/other)# Creates and names a library, sets it as either STATIC # or SHARED, and provides the relative paths to its source code. # You can define multiple libraries, and CMake builds them for you. # Gradle automatically packages shared libraries with your APK.add_library( # Sets the name of the library.native-lib# Sets the library as a shared library.SHARED# Provides a relative path to your source file(s).native-lib.cpp#添加額外的c文件cmdutils.cffmpeg.cffmpeg_filter.cffmpeg_opt.c) # 編解碼(最重要的庫) add_library(avcodecSHAREDIMPORTED) set_target_properties(avcodecPROPERTIES IMPORTED_LOCATION${CMAKE_SOURCE_DIR}/../jniLibs/armeabi-v7a/libavcodec-57.so)# 設(shè)備信息 add_library(avdeviceSHAREDIMPORTED) set_target_properties(avdevicePROPERTIES IMPORTED_LOCATION${CMAKE_SOURCE_DIR}/../jniLibs/armeabi-v7a/libavdevice-57.so)# 濾鏡特效處理庫 add_library(avfilterSHAREDIMPORTED) set_target_properties(avfilterPROPERTIES IMPORTED_LOCATION${CMAKE_SOURCE_DIR}/../jniLibs/armeabi-v7a/libavfilter-6.so)# 封裝格式處理庫 add_library(avformatSHAREDIMPORTED) set_target_properties(avformatPROPERTIES IMPORTED_LOCATION${CMAKE_SOURCE_DIR}/../jniLibs/armeabi-v7a/libavformat-57.so) # 重采樣處理庫 add_library(avresampleSHAREDIMPORTED) set_target_properties(avresamplePROPERTIES IMPORTED_LOCATION${CMAKE_SOURCE_DIR}/../jniLibs/armeabi-v7a/libavresample-3.so) # 工具庫(大部分庫都需要這個(gè)庫的支持) add_library(avutilSHAREDIMPORTED) set_target_properties(avutilPROPERTIES IMPORTED_LOCATION${CMAKE_SOURCE_DIR}/../jniLibs/armeabi-v7a/libavutil-55.so)# 后期處理 add_library(postprocSHAREDIMPORTED) set_target_properties(postprocPROPERTIES IMPORTED_LOCATION${CMAKE_SOURCE_DIR}/../jniLibs/armeabi-v7a/libpostproc-54.so)# 音頻采樣數(shù)據(jù)格式轉(zhuǎn)換庫 add_library(swresampleSHAREDIMPORTED) set_target_properties(swresamplePROPERTIES IMPORTED_LOCATION${CMAKE_SOURCE_DIR}/../jniLibs/armeabi-v7a/libswresample-2.so)# 視頻像素?cái)?shù)據(jù)格式轉(zhuǎn)換 add_library(swscaleSHAREDIMPORTED) set_target_properties(swscalePROPERTIES IMPORTED_LOCATION${CMAKE_SOURCE_DIR}/../jniLibs/armeabi-v7a/libswscale-4.so)# Searches for a specified prebuilt library and stores the path as a # variable. Because CMake includes system libraries in the search path by # default, you only need to specify the name of the public NDK library # you want to add. CMake verifies that the library exists before # completing its build.find_library( # Sets the name of the path variable.log-lib# Specifies the name of the NDK library that# you want CMake to locate.log )# Specifies libraries CMake should link to your target library. You # can link multiple libraries, such as libraries you define in this # build script, prebuilt third-party libraries, or system libraries.target_link_libraries( # Specifies the target library.native-lib avcodec avdevice avfilter avformat avresample avutil postproc swresample swscale# Links the target library to the log library# included in the NDK.${log-lib} )

運(yùn)行Run app至手機(jī)設(shè)備，出現(xiàn)如下如所示錯(cuò)誤

?D:\suowei\androidproject\FFmpegTestApplication\app\src\main\cpp\cmdutils.c:47:10: fatal error: 'libavutil/libm.h' file not found

解決方式：將下載之后的ffmpeg-3.3.9.tar.gz解壓之后的文件夾ffmpeg-3.3.9中l(wèi)ibavutil中的libm.h拷貝至android項(xiàng)目jniLibs下的libavutil中

?D:\suowei\androidproject\FFmpegTestApplication\app\src\main\cpp\ffmpeg.c:52:10: fatal error: 'libavutil/internal.h' file not found

?解決方式：將下載之后的ffmpeg-3.3.9.tar.gz解壓之后的文件夾ffmpeg-3.3.9中l(wèi)ibavutil中的internal.h拷貝至android項(xiàng)目jniLibs下的libavutil中