使用默认视频意图ACTION_VIDEO_CAPTURE录制无录音的视频，或在录制视频后删除声音，如snap chat

Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
startActivityForResult(intent, REQUEST_VIDEO_CAPTURE);

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_VIDEO_CAPTURE && resultCode == RESULT_OK) {
        Uri videoUri = data.getData();
        // 进行后续操作
    }
}

MediaMetadataRetriever retriever = new MediaMetadataRetriever();
retriever.setDataSource(context, videoUri);
String outputPath = getOutputFilePath(); // 自定义输出文件路径
MediaMuxer muxer = new MediaMuxer(outputPath, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
int audioTrackIndex = -1;
int videoTrackIndex = -1;

for (int i = 0; i < retriever.getTrackCount(); i++) {
    MediaFormat format = retriever.getTrackFormat(i);
    String mime = format.getString(MediaFormat.KEY_MIME);
    if (mime.startsWith("audio/")) {
        audioTrackIndex = i;
    } else if (mime.startsWith("video/")) {
        videoTrackIndex = i;
    }
}

retriever.release();

if (audioTrackIndex >= 0 && videoTrackIndex >= 0) {
    MediaExtractor extractor = new MediaExtractor();
    extractor.setDataSource(context, videoUri);

    muxer.addTrack(format);
    muxer.start();

    MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
    ByteBuffer buffer = ByteBuffer.allocate(bufferSize);

    while (true) {
        int sampleSize = extractor.readSampleData(buffer, 0);
        if (sampleSize < 0) {
            break;
        }

        bufferInfo.offset = 0;
        bufferInfo.size = sampleSize;
        bufferInfo.flags = extractor.getSampleFlags();
        bufferInfo.presentationTimeUs = extractor.getSampleTime();

        muxer.writeSampleData(videoTrackIndex, buffer, bufferInfo);
        extractor.advance();
    }

    muxer.stop();
    muxer.release();
    extractor.release();
}