如何从JWPlayer获取#EXT-X-PROGRAM-日期-时间

Question

我正在努力使用JWPlayer 8.2从实时HLS流中检索#EXT-X-PROGRAM-DATE-TIME的值。如果我捕获VOD流的'on meta‘JW事件，我可以看到我正在寻找的programDateTime参数/值，但在直播流上，JW似乎没有提供它，即使清单文件包含它。

以下是点播清单文件的示例：

#EXTM3U
#EXT-X-VERSION:4
## Created with Unified Streaming Platform(version=1.7.25)
#EXT-X-PLAYLIST-TYPE:VOD
#EXT-X-MEDIA-SEQUENCE:190527336
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-TARGETDURATION:8
#USP-X-TIMESTAMP-MAP:MPEGTS=7016782483,LOCAL=2018-04-20T10:04:42.023600Z
#EXT-X-PROGRAM-DATE-TIME:2018-04-20T10:04:42.023683Z
#EXTINF:8.008, no desc
live-video=8000000-190527336.ts?token=abcco|2018-04-24T13:08:07Z|RufAWBYsJCTRTc06E%2BtSvg==|038cd04f1e982ce33e16702639268381ede1652e&amp%3Bt=2018-04-20T11:04:38-2018-04-20T10:05:16
#EXTINF:7.9914, no desc
live-video=8000000-190527337.ts?token=abcco|2018-04-24T13:08:07Z|RufAWBYsJCTRTc06E%2BtSvg==|038cd04f1e982ce33e16702639268381ede1652e&amp%3Bt=2018-04-20T11:04:38-2018-04-20T10:05:16
#EXTINF:8.008, no desc
live-video=8000000-190527338.ts?token=abcco|2018-04-24T13:08:07Z|RufAWBYsJCTRTc06E%2BtSvg==|038cd04f1e982ce33e16702639268381ede1652e&amp%3Bt=2018-04-20T11:04:38-2018-04-20T10:05:16
#EXTINF:7.9913, no desc
live-video=8000000-190527339.ts?token=abcco|2018-04-24T13:08:07Z|RufAWBYsJCTRTc06E%2BtSvg==|038cd04f1e982ce33e16702639268381ede1652e&amp%3Bt=2018-04-20T11:04:38-2018-04-20T10:05:16
#EXTINF:1.7684, no desc
live-video=8000000-190527340.ts?token=abcco|2018-04-24T13:08:07Z|RufAWBYsJCTRTc06E%2BtSvg==|038cd04f1e982ce33e16702639268381ede1652e&amp%3Bt=2018-04-20T11:04:38-2018-04-20T10:05:16
#EXT-X-ENDLIST 

...and元有效负载上的JW：

meta= {
        "duration": 33.7671,
        "height": 480,
        "width": 853,
        "seekRange": {
            "start": 0,
            "end": 33.7671
            },
        "type": "meta"
    }
meta= {
        "programDateTime": "2018-04-20T10:04:42.023683Z",
        "type": "meta
    }

...and实时清单示例：

#EXTM3U
#EXT-X-VERSION:4
## Created with Unified Streaming Platform(version=1.7.25)
#EXT-X-MEDIA-SEQUENCE:190571398
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-TARGETDURATION:8
#USP-X-TIMESTAMP-MAP:MPEGTS=4382044205,LOCAL=2018-04-24T11:59:42.024600Z
#EXT-X-PROGRAM-DATE-TIME:2018-04-24T11:59:42.024683Z
#EXTINF:8.008, no desc
live-video=8000000-190571398.ts?token=abcco|2018-04-24T13:00:13Z|RufAWBYsJCTRTc06E%2BtSvg==|b57a1e57d55685deb9aff6ad41292f1053d7294f
#EXTINF:7.9914, no desc
live-video=8000000-190571399.ts?token=abcco|2018-04-24T13:00:13Z|RufAWBYsJCTRTc06E%2BtSvg==|b57a1e57d55685deb9aff6ad41292f1053d7294f
#EXTINF:8.008, no desc
live-video=8000000-190571400.ts?token=abcco|2018-04-24T13:00:13Z|RufAWBYsJCTRTc06E%2BtSvg==|b57a1e57d55685deb9aff6ad41292f1053d7294f
#EXTINF:7.9913, no desc
live-video=8000000-190571401.ts?token=abcco|2018-04-24T13:00:13Z|RufAWBYsJCTRTc06E%2BtSvg==|b57a1e57d55685deb9aff6ad41292f1053d7294f
#EXTINF:8.008, no desc
live-video=8000000-190571402.ts?token=abcco|2018-04-24T13:00:13Z|RufAWBYsJCTRTc06E%2BtSvg==|b57a1e57d55685deb9aff6ad41292f1053d7294f
#EXTINF:7.9913, no desc
live-video=8000000-190571403.ts?token=abcco|2018-04-24T13:00:13Z|RufAWBYsJCTRTc06E%2BtSvg==|b57a1e57d55685deb9aff6ad41292f1053d7294f
#EXTINF:8.008, no desc
live-video=8000000-190571404.ts?token=abcco|2018-04-24T13:00:13Z|RufAWBYsJCTRTc06E%2BtSvg==|b57a1e57d55685deb9aff6ad41292f1053d7294f

...and on meta有效负载：

meta= {
        "duration": null,
        "height": 480,
        "width": 853,
        "seekRange": {
            "start": 0,
            "end": 88.0046
            },
        "type": "meta"
    }

正如您所看到的，两个清单文件中都提供了#EXT-X-PROGRAM-DATE-TIME，但是我还没有找到提取live的值的方法。

如有任何想法或帮助，我们将不胜感激。

Answer 1

这里没有太多的答案，但元数据似乎依赖于实时流本身。我刚刚在JW 8.2.3中检查了一个直播流的on('meta')响应对象，我看到：

{  
   "metadataTime":123.00226666666667,
   "metadata":{  
      "PRIV":{  
         "com.cisco.streaming.Timecode.0":"\t\u0013ٸ̐踐"
      },
      "width":320,
      "height":180,
      "duration":null
   },
   "type":"meta"
}