如何使用android MediaMuxer混合不同长度的音频和视频

Question

我想使用混合视频(1分钟)和音频(10秒)。我想要音频重复，直到视频结束。当我使用下面的代码时，音频只播放10秒。有人知道怎么解决这个问题吗？

 mediaMuxer.start();
        while ((sampleSize = videoExtra.readSampleData(videoBuffer, 0 )) != -1) {
            videoBufferInfo.offset = 0;
            videoBufferInfo.size = sampleSize;
            videoBufferInfo.presentationTimeUs = videoExtra.getSampleTime();
            videoBufferInfo.flags = videoExtra.getSampleFlags();
            mediaMuxer.writeSampleData(videoIndex, videoBuffer, videoBufferInfo);

            videoExtra.advance();
        }



        while ((audioSize = musicExtra.readSampleData(audioBuffer, 0)) != -1) {
            audioBufferInfo.offset = 0;
            audioBufferInfo.size = audioSize;
            audioBufferInfo.presentationTimeUs = musicExtra.getSampleTime();
            audioBufferInfo.flags = musicExtra.getSampleFlags();
            mediaMuxer.writeSampleData(audioIndex, audioBuffer, audioBufferInfo);
            musicExtra.advance();
        }
        musicExtra.seekTo(0, MediaExtractor.SEEK_TO_CLOSEST_SYNC);

        videoExtra.release();
        musicExtra.release();
        mediaMuxer.stop();
        mediaMuxer.release();

Answer 1

1. 三个输入参数： 字符串videoPath，字符串audioPath，字符串outputPath
2. 获取视频持续时间及其跟踪索引： videoExtractor =新MediaExtractor()；videoExtractor.setDataSource(videoPath)；MediaFormat videoFormat = null；int videoTrackCount = videoExtractor.getTrackCount()；//vedio max输入大小int frameMaxInputSize = 0；int frameRate = 0；long videoDuration = 0；for (int i= 0；i< videoTrackCount；i++) { videoFormat = videoExtractor.getTrackFormat(i)；String mimeType =videoFormat.getString(videoFormat.getString)；如果( videoFormat.getInteger(MediaFormat.KEY_MAX_INPUT_SIZE)；(“视频/”)){ /* *只使用第一个音轨*/ videoTrackIndex = i；frameMaxInputSize =mimeType.startsWith frameRate = videoFormat.getInteger(MediaFormat.KEY_FRAME_RATE)；videoDuration = videoFormat.getLong(MediaFormat.KEY_DURATION)；break；}}如果(videoTrackIndex <0){Log.e(标记，“错误输入文件：：无Vedio跟踪”)；返回；}
3. 获取音频信息 audioExtractor =新的MediaExtractor()；audioExtractor.setDataSource(audioPath)；MediaFormat audioFormat =空；int audioTrackCount = audioExtractor.getTrackCount()；audioExtractor =新的MediaExtractor()；int audioTrackCount = audioExtractor.getTrackCount()；for (int i= 0；i< audioTrackCount；i++) { audioFormat = audioExtractor.getTrackFormat(i)；String mimeType =audioFormat.getString(MimeType)；if ((“音频/”)){= i；如果(audioTrackIndex <0){Log.e(标记，“错误输入文件：：No Audio track")；返回；}
4. 编写视频数据： videoExtractor.unselectTrack(videoTrackIndex)；()；(真){ int =(，0)；如果( videoExtractor.unselectTrack(videoTrackIndex)；< 0) {readVideoSampleSize中断；} long videoSampleTime = videoExtractor.getSampleTime()；videoBufferInfo.size = readVideoSampleSize；videoBufferInfo.presentationTimeUs = videoSampleTime；//视频videoBufferInfo.表示时刻表+= 1000 * 1000 / frameRate；videoBufferInfo.offset = 0；videoBufferInfo.flags = videoExtractor.getSampleFlags()；videoBufferInfo.presentationTimeUs byteBuffer，videoBufferInfo)；videoExtractor.advance()；}
5. 编写音频数据 长音频呈现时间u= 0；MediaCodec.BufferInfo audioBufferInfo =新MediaCodec.BufferInfo()；audioExtractor.selectTrack(audioTrackIndex)；/* *最后一次音频演示时间。*/ long lastEndAudioTimeUs = 0；while (true) { int readAudioSampleSize = audioExtractor.readSampleData(byteBuffer，0)；if (readAudioSampleSize < 0) {//如果流的结束，取消选择“如果(audioPresentationTimeUs >= videoDuration)”{/ if已到达视频时间结束，只需退出中断；}否则{/如果不是视频时间的结束，只需重复。_~_mediaMuxer.writeSampleData(writeAudioTrackIndex，byteBuffer，audioBufferInfo)；audioExtractor.advance()；}
6. 发布资源. if (mediaMuxer != null) { try { mediaMuxer.stop()；mediaMuxer.release()；} catch (异常e) { e.printStackTrace()；} if (videoExtractor != null) { try { videoExtractor.release()；} catch (异常e) { e.printStackTrace()；}}如果(audioExtractor != null) {尝试{ audioExtractor.release()；} catch (异常e) { e.printStackTrace()；}}

希望这能有所帮助！