Question

我正在开发一个带有mp3音频文件的Android应用程序和带有（没有声音）的mp4视频文件。

现在我想混合它们并创建一个新的mp4视频文件（带声音）。从Android 4.3开始，Google建议使用MediaMuxer类来混合流音频和视频。我多次尝试都没有成功。

以下是代码：

    private void muxing() {

    String outputFile = "";

    try {

        File file = new File(Environment.getExternalStorageDirectory() + "/final2.mp4");
        file.createNewFile();
        outputFile = file.getAbsolutePath();
        MediaExtractor videoExtractor = new MediaExtractor();
        videoExtractor.setDataSource(Environment.getExternalStorageDirectory().toString()+"/vd1.h264");
        MediaExtractor audioExtractor = new MediaExtractor();
        audioExtractor.setDataSource(Environment.getExternalStorageDirectory()+"/audioVideoDir/audio.m4a");
        MediaMuxer muxer = new MediaMuxer(outputFile, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);

        videoExtractor.selectTrack(0);
        MediaFormat videoFormat = videoExtractor.getTrackFormat(0);
        int videoTrack = muxer.addTrack(videoFormat);

        audioExtractor.selectTrack(0);
        MediaFormat audioFormat = audioExtractor.getTrackFormat(0);
        int audioTrack = muxer.addTrack(audioFormat);
        boolean sawEOS = false;
        int frameCount = 0;
        int offset = 100;
        int sampleSize = 256 * 1024;
        ByteBuffer videoBuf = ByteBuffer.allocate(sampleSize);
        ByteBuffer audioBuf = ByteBuffer.allocate(sampleSize);
        MediaCodec.BufferInfo videoBufferInfo = new MediaCodec.BufferInfo();
        MediaCodec.BufferInfo audioBufferInfo = new MediaCodec.BufferInfo();


        videoExtractor.seekTo(0, MediaExtractor.SEEK_TO_CLOSEST_SYNC);
        audioExtractor.seekTo(0, MediaExtractor.SEEK_TO_CLOSEST_SYNC);

        muxer.start();

        while (!sawEOS)
        {
            videoBufferInfo.offset = offset;
            videoBufferInfo.size = videoExtractor.readSampleData(videoBuf, offset);


            if (videoBufferInfo.size < 0 || audioBufferInfo.size < 0)
            {
               // Log.d(TAG, "saw input EOS.");
                sawEOS = true;
                videoBufferInfo.size = 0;

            }
            else
            {
                videoBufferInfo.presentationTimeUs = videoExtractor.getSampleTime();
                videoBufferInfo.flags = videoExtractor.getSampleFlags();
                muxer.writeSampleData(videoTrack, videoBuf, videoBufferInfo);
                videoExtractor.advance();


                frameCount++;

            }
        }

        Toast.makeText(getApplicationContext() , "frame:" + frameCount , Toast.LENGTH_SHORT).show();



        boolean sawEOS2 = false;
        int frameCount2 =0;
        while (!sawEOS2)
        {
            frameCount2++;

            audioBufferInfo.offset = offset;
            audioBufferInfo.size = audioExtractor.readSampleData(audioBuf, offset);

            if (videoBufferInfo.size < 0 || audioBufferInfo.size < 0)
            {
              //  Log.d(TAG, "saw input EOS.");
                sawEOS2 = true;
                audioBufferInfo.size = 0;
            }
            else
            {
                audioBufferInfo.presentationTimeUs = audioExtractor.getSampleTime();
                audioBufferInfo.flags = audioExtractor.getSampleFlags();
                muxer.writeSampleData(audioTrack, audioBuf, audioBufferInfo);
                audioExtractor.advance();

            }
        }

        Toast.makeText(getApplicationContext() , "frame:" + frameCount2 , Toast.LENGTH_SHORT).show();

        muxer.stop();
        muxer.release();


    } catch (IOException e) {

    } catch (Exception e) {

    }
}

我收到以下错误：

未知的mime类型'audio / mpeg'。 12-09 11：58：33.569：A / MPEG4Writer（332）：frameworks / av / media / libstagefright / MPEG4Writer.cpp：2699 CHECK（！“不应该在这里，未知的mime类型。”）

使用Google的MediaMuxer API解决我的问题的任何解决方案？即使我在合并音频和视频后尝试使用ffmpeg视频也不会在Android设备的默认视频播放器中播放，但它会在Vlc播放器中加载。

FFMPEG 紧随其后：https://github.com/WritingMinds/ffmpeg-android-java

Answer 1

尝试添加mp4视频文件。它为我工作。但输出文件有音频持续时间。

如何使用MediaMuxer合并音频和视频？

1 个答案: