java - 如何仅使用 java 将 mp4 文件转换为 webm？

Question

我正在尝试将文件从 mp4 转换为 webm。我正在尝试使用 FFmpeg 的 JAVE 包装器。我收到错误消息。
这是我的代码:

private String ConvertVideo(URL url) {
    File target =null;
    MultimediaObject multimediaObject = new MultimediaObject(url);
    try {
        target = File.createTempFile("target", ".webm");

    } catch (IOException e1) {
        e1.printStackTrace();
    }
    AudioAttributes audio = new AudioAttributes();
    audio.setCodec(AudioAttributes.DIRECT_STREAM_COPY);
    audio.setBitRate(new Integer(128000));
    audio.setSamplingRate(new Integer(44100));
    audio.setChannels(new Integer(2));
    VideoAttributes video = new VideoAttributes();
    video.setBitRate(new Integer(160000));
    video.setFrameRate(new Integer(15));
    video.setCodec("libvpx-vp9");
    video.setCodec(VideoAttributes.DIRECT_STREAM_COPY);
    EncodingAttributes attrs = new EncodingAttributes();
    attrs.setFormat("webm");
    attrs.setAudioAttributes(audio);
    attrs.setVideoAttributes(video);
    
    try {
          Encoder encoder = new Encoder();  
          encoder.encode(multimediaObject, target, attrs);
        } catch (Exception e) {  
           e.printStackTrace();
        }
    
    return "success";
}

我收到以下错误:

2022-Jun-13 11:12:55 AM [qtp1914526580-175] ERROR ws.schild.jave.Encoder - Process exit code: 1  to target2636257785060285182.webm
ws.schild.jave.EncoderException: Exit code of ffmpeg encoding run is 1

我在这里做错了什么。还有其他方法吗？我只想用java来做。

Answer 1

我已经整理好了。这是我的最终工作代码。刚刚删除了 video.setCodec(VideoAttributes.DIRECT_STREAM_COPY); 行并且还更改了 audio.setCodec(AudioAttributes.DIRECT_STREAM_COPY); 行至audio.setCodec("libvorbis");

private String convertVideo(URL url) {
        File target =null;
        MultimediaObject multimediaObject = new MultimediaObject(url);

        try {
            target = File.createTempFile("target", ".webm");
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        AudioAttributes audio = new AudioAttributes();
        audio.setCodec("libvorbis");
        audio.setBitRate(new Integer(128000));
        audio.setSamplingRate(new Integer(44100));
        audio.setChannels(new Integer(2));
        VideoAttributes video = new VideoAttributes();
        video.setBitRate(new Integer(160000));
        video.setFrameRate(new Integer(20));
        video.setCodec("libvpx-vp9");
        EncodingAttributes attrs = new EncodingAttributes();
        attrs.setFormat("webm");
        attrs.setAudioAttributes(audio);
        attrs.setVideoAttributes(video);
        
        try {
              Encoder encoder = new Encoder();  
              encoder.encode(multimediaObject, target, attrs);
            } catch (Exception e) {   
               e.printStackTrace();
            }       
        return "success";
    }