压缩的 mp4 视频播放时间过长 (exoplayer)

Compressed mp4 video is taking too long time to play (exoplayer)

视频(mp4) 从android 摄像头录制并发送到后端,这里我使用ffmpeg 包装器压缩视频[44mb 视频到5.76mb]。压缩效果很好,但是当我发送视频在 android(exo player) 中播放时,启动时间太长。

下面是我要压缩的代码:

 FFmpegBuilder builder = new FFmpegBuilder()
                   .setInput("D:/dummyVideos/myvideo.mp4")     // Filename, or a FFmpegProbeResult
                   .overrideOutputFiles(true) // Override the output if it exists
                   .addOutput("D:/dummyVideos/myvideo_ffmpeg.mp4")   // Filename for the destination
                   .setFormat("mp4")       // Format is inferred from filename, or can be set
                   .disableSubtitle()       // No subtiles
                   .setAudioChannels(1)         // Mono audio
                   .setAudioCodec("aac")       // using the aac codec
                   .setAudioSampleRate(48_000) // at 48KHz
                   .setAudioBitRate(32768)     // at 32 kbit/s
                   .setVideoCodec("libx264")     // Video using x264
                   .setVideoFrameRate(24, 1)     // at 24 frames per second 
                   .setVideoResolution(1280, 720) // at 640x480 resolution
                   .setVideoBitRate(762800)
                   .setStrict(FFmpegBuilder.Strict.EXPERIMENTAL) // Allow FFmpeg to use experimental specs
                   .done();

谁能告诉我为什么视频在 exo 播放器中播放时间过长?压缩有什么问题吗?

根据我正在写的评论和此处,由于 "moov" 原子视频需要很长时间才能播放,这里是描述的博客:https://rigor.com/blog/2016/01/optimizing-mp4-video-for-fast-streaming

代码是:

try{
        QtFastStart.fastStart(inputFile, outputFile); // Adds moov to your input
                   // Now your output file is ready to stream!
        }catch (QtFastStart.MalformedFileException m){
            logger.error("QT", m);
        }catch (QtFastStart.UnsupportedFileException q){
            logger.error("QT", q);
        }catch (IOException i){
            logger.error("QT", i);              
        }