我正在尝试在
Android上连接两个视频.我已经在使用ffmpeg来满足其他需求,但我使用的是
halfninja’s one,只有0.9. 0.9版本不允许以下方式执行此操作：
// filter_complex isn't recognized
vk.run(new String[] {
"ffmpeg","-i",inputFile1,inputFile2,"-filter_complex","'[0:1] [0:0] [1:1] [1:0] concat=n=2:v=1:a=1 [v] [a]'","-map","'[v]'","'[a]'",outputFile
});
// Or,after converting the two videos to ts,trying to merge them: concat:file1.ts|file2.ts: No such file or directory
vk.run(new String[] {
"ffmpeg","'concat:" + ts1 + "|" + ts2 + "'","-vcodec","copy","-acodec","-absf","aac_adtstoasc",output
});
我尝试的第三件事是使用here解释的concat demuxer,ffmpeg 0.9也无法识别.
有没有办法在Android上用ffmpeg 0.9(或其他库)连接两个视频？
解决方法
嗯,找到的唯一解决方案是使用ffmpeg≥1.1.我编译了2.1,它工作得很好.这是我现在使用的：
/**
* Concatenates two videos
* @param inputFile1 First video file path
* @param inputFile2 Second video file path
* @param outputFile Output file path
*/
public static void concatenate(String inputFile1,String inputFile2,String outputFile) {
Log.d(TAG,"Concatenating " + inputFile1 + " and " + inputFile2 + " to " + outputFile);
String list = generateList(new String[] {inputFile1,inputFile2});
Videokit vk = Videokit.getInstance();
vk.run(new String[] {
"ffmpeg","-f","concat",list,"-c",outputFile
});
}
/**
* Generate an ffmpeg file list
* @param inputs Input files for ffmpeg
* @return File path
*/
private static String generateList(String[] inputs) {
File list;
Writer writer = null;
try {
list = File.createTempFile("ffmpeg-list",".txt");
writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(list)));
for (String input: inputs) {
writer.write("file '" + input + "'\n");
Log.d(TAG,"Writing to list file: file '" + input + "'");
}
} catch (IOException e) {
e.printStackTrace();
return "/";
} finally {
try {
if (writer != null)
writer.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
Log.d(TAG,"Wrote list file to " + list.getAbsolutePath());
return list.getAbsolutePath();
}
