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我尝试在 MP4Box 的帮助下为视频创建破折号格式当我运行命令时：- 它使用 Ubuntu 16.4MP4Box -dash 2000 -rap -frag-rap -profile onDemand 1OaG8xKJPZg-320.mp4 1OaG8xKJPZg-720.mp4 显示一些警告， 然后在我收到 1OaG8xKJPZg-320_dash.mpd 1OaG8xKJPZg-320_dashinit.mp4 1OaG8xKJPZg-720_dashinit.mp4 这些文件我上传到谷歌带有公开共享链接的云，供参考我使用我的播放器活动上传到谷歌驱动器

https://drive.google.com/drive/folders/1t_YF_TJrMnQOQ8BNBiDjC8erPhRjVy_1?usp=sharing

当我运行我的程序时，我收到错误exoplayer2.ParserException 

Source error.
                                                                               com.google.android.exoplayer2.ParserException: inputStream does not contain a valid media presentation description
                                                                                   at com.google.android.exoplayer2.source.dash.manifest.DashManifestParser.parse(DashManifestParser.java:96)
                                                                                   at com.google.android.exoplayer2.source.dash.manifest.DashManifestParser.parse(DashManifestParser.java:54)
                                                                                   at com.google.android.exoplayer2.upstream.ParsingLoadable.load(ParsingLoadable.java:115)
                                                                                   at com.google.android.exoplayer2.upstream.Loader$LoadTask.run(Loader.java:295)
                                                                                   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
                                                                                   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
                                                                                   at java.lang.Thread.run(Thread.java:761)

我尝试了多次，但每次我收到相同的错误

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