Question

我正在使用ffmpeg-android来合并两个视频文件，但是合并时间太长了，我猜是因为使用了"-filter_complex"但这是我在互联网上找到的唯一命令，可以请某人简化以下命令？我只想合并camera2 api捕获的两个视频文件，而无需进行任何修改。

 String command[] = new String[]{
                        "-y",
                        "-i", firstPath,
                        "-i", secondPath,
                        "-strict",
                        "experimental",
                        "-filter_complex",
                        "[0:v]scale=iw*min(1920/iw\\,1080/ih):ih*min(1920/iw\\,1080/ih)," +
                                "pad=1920:1080:(1920-iw*min(1920/iw\\,1080/ih))/2:(1080-ih*min(1920/iw\\,1080/ih))/2,setsar=1:1[v0];[1:v] scale=iw*min(1920/iw\\,1080/ih):ih*min(1920/iw\\,1080/ih)," +
                                "pad=1920:1080:(1920-iw*min(1920/iw\\,1080/ih))/2:(1080-ih*min(1920/iw\\,1080/ih))/2,setsar=1:1[v1];[v0][0:a][v1][1:a] concat=n=2:v=1:a=1",
                        "-ab", "48000", "-ac", "2", "-ar", "22050", "-s", "1920x1080", "-vcodec", "libx264", "-crf", "27", "-q", "4", "-preset", "ultrafast", getVideoFilePath(getActivity())};
                commandFFMPEG(command);


 private void commandFFMPEG(String command[]) {
        FFmpeg ffmpeg = FFmpeg.getInstance(getActivity());
        try {
            ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {

                @Override
                public void onStart() {
                    startTime = System.currentTimeMillis();
                }

                @Override
                public void onProgress(String message) {

                }

                @Override
                public void onFailure(String message) {

                }

                @Override
                public void onSuccess(String message) {
                    long endTime = System.currentTimeMillis();
                    long result = endTime - startTime;
                    Toast.makeText(getActivity(), "Videos are merged", Toast.LENGTH_SHORT).show();
                }

                @Override
                public void onFinish() {

                }
            });
        } catch (FFmpegCommandAlreadyRunningException e) {
            // Handle if FFmpeg is already running
        }
    }

Answer 1

Idk会为您提供帮助，但是当我想用ffmpeg连接视频时，我使用了以下命令：

StringBuilder builder = new StringBuilder();
builder.append("-f ");
builder.append("concat ");
builder.append("-safe 0 ");
builder.append("-i ");
final String tempFile = getTextFile().getAbsolutePath();//it is text file with video files paths
builder.append(tempFile);
builder.append(" ");
builder.append("-c ");
builder.append("copy ");
builder.append(saveFile);// saveFile - it is your output file

无论如何，总时长为20秒的级联视频需要大约20秒的处理时间。您可以看一下here，我是为串联多个视频而编写的，但是代码质量很糟糕，我不知道，您是否会明白那里的内容。希望对您有帮助）

Answer 2

String cmd [] = new String [] {“ -y”，“-i”，“ vid.mp4”，“ i”，“ vid2.mp4”，“ -preset”，“ ultrafast”，“- filter_complex“，” [0：v] [0：a] [1：v] [1：a] concat = n = 2：v = 1：a = 1 [v] [a]“，”-map“， “ [v]”，“-map”，“ [a]”，“ // output.mp4”};

这对我有用！
使用的媒体格式：mp4
两个视频的尺寸均相同-320x240（必填）

使用的ffmpeg库：com.writingminds：FFmpegAndroid：0.3.2

使用ffmpeg-android的Concat视频文件

2 个答案: