HLS流上的Safari进度条不完整

Question

我正在将视频转码为HLS，并且能够通过以下方式验证流：

$mediastreamvalidator <url-to-master-playlist.m3u8>

Mediastreamvalidator没有错误，所有细分似乎确定。

然而，在许多视频中，进度条包含一个小的白色/未加载的片段，尽管视频片段完全加载，但它们永远不会改变。这与我的编码属性有关吗？

以下是其中一个错误段的mediastreamvalidator输出：

Processed 3 out of 3 segments
Average segment duration: 3.686918
Total segment bitrates (all discontinuities): average: 2293.51 kb/s, max: 2562.78 kb/s
Playlist max bitrate: 2374.000000 kb/s
Audio Group ID: AUDIO


Discontinuity: sequence: 0, parsed segment count: 3 of 3, duration: 11.061 sec, average: 2293.51 kb/s, max: 2562.78 kb/s
Track ID: 1
Audio Codec: AAC-LC
Audio sample rate: 44100 Hz
Audio channel layout: Stereo (L R)
Track ID: 2
Video Codec: avc1
Video profile: Main
Video level: 3.1
Video resolution: 480x360
Video average IDR interval: 3.409137, Standard deviation: 0.000005
Video frame rate: 26.400