3

所以使用ffmpeg

/usr/local/bin/ffmpeg -i track.m4a -vn -c:a aac -b:a 192k  -f segment -segment_list 93_jrf2niqb7n2s8pzjopkqvbbw1wmzz3foqrsa93bm.m3u8 -segment_time 120 -segment_format_options movflags=faststart  93_jrf2niqb7n2s8pzjopkqvbbw1wmzz3foqrsa93bm.%03d.m4a

创建播放列表文件的位置

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-ALLOW-CACHE:YES
#EXT-X-TARGETDURATION:121
#EXTINF:120.000726,
93_jrf2niqb7n2s8pzjopkqvbbw1wmzz3foqrsa93bm.000.m4a
#EXTINF:119.883175,
93_jrf2niqb7n2s8pzjopkqvbbw1wmzz3foqrsa93bm.001.m4a
#EXT-X-ENDLIST

然后使用 mediastreamvalidator 我得到以下输出，这让我相信存在我不知道如何修复的错误。我假设 ffmpeg 正在提升分段。

mediastreamvalidator http://**OMIT**/AMP/1/92_y7lu9u1qy5wsw2fqn61mankqof7lkuu5qvk7asv5.m3u8
mediastreamvalidator: Version 1.2(160525)

[/AMP/1/92_y7lu9u1qy5wsw2fqn61mankqof7lkuu5qvk7asv5.m3u8] Started root playlist download
[/AMP/1/92_y7lu9u1qy5wsw2fqn61mankqof7lkuu5qvk7asv5.m3u8] Started media playlist download
Error injecting segment data
Can't deal with multiple sample timings per sample buffer
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[/AMP/1/92_y7lu9u1qy5wsw2fqn61mankqof7lkuu5qvk7asv5.m3u8] All media files delivered and have end tag, stopping

--------------------------------------------------------------------------------
http://**OMIT**/AMP/1/92_y7lu9u1qy5wsw2fqn61mankqof7lkuu5qvk7asv5.m3u8
--------------------------------------------------------------------------------
Processed 1 out of 2 segments
Average segment duration: 119.941950
Total segment bitrates (all discontinuities): average: 130.88 kb/s, max: 131.25 kb/s


Discontinuity: sequence: 0, parsed segment count: 1 of 2, duration: 239.884 sec, average: 130.88 kb/s, max: 131.25 kb/s
Track ID: 1
Audio Codec: AAC-LC
Audio sample rate: 44100 Hz
Audio channel layout: Stereo (L R)

所以，我的问题是什么是“错误注入段数据”和“无法处理每个样本缓冲区的多个样本计时”，为什么段搞砸了？

4

1 回答 1

0

我还在 mediaStreamValidator 中遇到了这两个错误并设法修复了它们

1）“无法处理每个样本缓冲区的多个样本计时” - 当样本持续时间设置为“每个样本”时，fMP4 块会发生这种情况。mediaStreamValidator 需要使用默认的采样持续时间，对于块中的所有轨道样本都相等，在轨道相关的原子中有一个特殊的标志

2）“错误注入段数据” - 表示验证器无法下载块进行分析。不是因为网络问题，而是其他一些原因。

在我的例子中，m3u8 包含 #EXT-X-BYTERANGE 和 #EXT-X-MAP:URI...BYTERANGE 标签。我在本地使用 SimpleHTTPServer 进行测试（python oneliner，在 MacOS 中很流行）。结果证明 SimpleHTTPServer 不能很好地处理范围请求，在没有适当范围的情况下提供此类文件。所以验证器得到了完整的块而不是字节范围的数据。

切换到 node.js http-server 而不是 SimpleHTTPServer 后，错误立即消失

于 2018-06-14T10:33:06.993 回答