How does "Auto" work in RTMP?
I am trying to understand how the "Auto" quality setting for RTMP works. In particular, I want to confirm that for a high-bandwidth connection, I get the high-quality video.
For browsers that support Flash, I set options.primary to 'flash', and I set up JWPlayer as follows:
playlist.sources = [{
file : URL FOR SMIL FILE,
type : "smil"
}];
The smile file for this particular video (which has four qualities) is as follows:
<smil>
<head>
<meta base="rtmp://s1yaos2riuxe0y.cloudfront.net/cfx/st"/>
</head>
<body>
<switch>
<video height="1078" width="1920" system-bitrate="1457000"
src="5390c461da06a0ac1f788265.mp4?Expires=1402411937&Signature=Xvo5r4~U-QDmu0FpnHJOkXYgupG~D3Bf1wzR1Ygi6Bu~nruIBbiqhaz~O1SZIjMe9zsIkAgKJnDppPHh9G6H4ZUMpN8zziGPoUHV5lnUuJnt108MdRh2QJXQRMmo6EIWd6e-A4BBUBvpQz3T6n0BhgcFmi7d0fpbVYq5jvjcEYA_&Key-Pair-Id=APKAJXYWFXCDTRLR3EFA"/>
<video height="720" width="1280" system-bitrate="801000"
src="5390c460da06a0ac1f788263.mp4?Expires=1402411937&Signature=IS1sKPf6~gJ1i8YPbpTplNj77rKqxFLbZJ~wkC7vfRxpEjW2W1JD5atIEUPlTPQNLhbnTZfNXEfgbNLf31eSTXiE7ZYByy9uOTtbYrNDow7trSvz0YWn-QrWcR-isQAjnl4WQ3O5HQPkpFCFhzUcqXEV7J5NlBiCUVGK6sDnx6A_&Key-Pair-Id=APKAJXYWFXCDTRLR3EFA"/>
<video height="360" width="640" system-bitrate="318000"
src="5390c45fda06a0ac1f788262.mp4?Expires=1402411937&Signature=TP0huz2hgOV97cSSIZizNQDpOfE1abU6~TCpkopPYYPfsP8yggrVm-f-MJ0~lcUpPtoIO3MfboaaUlGwCXeJk8W5lyZ6TiysFSHivgxbKj3lKK44~~eIPLaMHr-mfXzqaRz1gJa42fOEZC4ybeMNSuVIqQSQ~unRoLua0eilLHA_&Key-Pair-Id=APKAJXYWFXCDTRLR3EFA"/>
<video height="180" width="320" system-bitrate="113000"
src="5390c45fda06a0ac1f788261.mp4?Expires=1402411937&Signature=m-Mup5jaa9sagXrESw4iz8a2CDsC0-xvWZtRoXSbjFnlAGq2N1e0DU1B0biE1NjSEAk7alFNdWYC1oj1oQCEGLQkBlvBIxHYE4ROPokJoO354Mu3LIEZeXlSNg1ArHtWW6kaOCQ39XVUEbbMS-oXlJrWxroyuWZ9tFGFmf3eAc4_&Key-Pair-Id=APKAJXYWFXCDTRLR3EFA"/>
</switch>
</body>
</smil>
I set up an onQualityChange event handler to log what's going on.
In this event handler, player.getQualityLevels() returns:
[
{
"label": "Auto"
},
{
"height": 1078,
"id": "mp4:5390c461da06a0ac1f788265.mp4?Expires=1402412876&Signature=a0cI1wXaUvklU5SA5xawkzkX2b5AycM4CpVR3cyUd-2jMQMnfD7vY7cTF0TeehbFzNSpgNaWJb4O6pxOdjTZcuLcJ3HugcJiJNCfEisFrFtY5T-Fmy-TnLc3GeZfHnhf--E0ONCIPop73DiKT2zgYlgv~cfHXrdTkvPk9Yod7Wc_&Key-Pair-Id=APKAJXYWFXCDTRLR3EFA",
"width": 1920,
"bitrate": 1423,
"label": "1078p"
},
{
"height": 720,
"id": "mp4:5390c460da06a0ac1f788263.mp4?Expires=1402412876&Signature=nMqqwQ7pmFbW9Iluy69ROQ9pIev6pFpBYTjxxvBckrDHCZ7k0wgFS3Wza4FdU72FkeMdxpRKj1B6iZKCayuVwd1NVqjfOuZxERS4M7Oov~UAao0eKIiKa0gXAKGsnY2Tb6FNcpdgtdyOmtSxbnPNrk1FNqPgwZZXCvaBkRhlEHI_&Key-Pair-Id=APKAJXYWFXCDTRLR3EFA",
"width": 1280,
"bitrate": 782,
"label": "720p"
},
{
"height": 360,
"id": "mp4:5390c45fda06a0ac1f788262.mp4?Expires=1402412876&Signature=EYVwh-i54xLHdtZEKXbqBxzXYpoPEFdvmK2FQFMA31uXj-hNrQ6BPo1At3WDbDL6iNhvQ6MPt4jN5CTjDnJvUyEpSdbu888j7RXSZhQeJBkBbh8uFTo4LcrjNQSUTi7Ua8x~79a~t8tpCbRBwlLOwB4GFkJqUPjZPadHGgin6VI_&Key-Pair-Id=APKAJXYWFXCDTRLR3EFA",
"width": 640,
"bitrate": 311,
"label": "360p"
},
{
"height": 180,
"id": "mp4:5390c45fda06a0ac1f788261.mp4?Expires=1402412876&Signature=ScREDPPaeZ0rSEsoCO4mr5Xr2ZRrN0GVrCq49Cs-yuZ~k2kZA2ZgkAr96eGziwPZH9Z-j1iptx886lrt4yUzxdZgxTfrXmU6wvJaDk~t7KsjGi~rJV-WG23rzuyRt7tFqLZH4Ky53AxVrBTyb3CJ8da5GHL-39-65E45ob8vCr8_&Key-Pair-Id=APKAJXYWFXCDTRLR3EFA",
"width": 320,
"bitrate": 110,
"label": "180p"
}
]
This seems correct.
When I select a quality, event.currentQuality is always the value you'd expect based on the array above. But player.getCurrentQuality() always returns 3, no matter what the previous or current selection is (why?). Just from looking at it, I think "Auto" is choosing 360p. But we have plenty of bandwidth—the 1080p version displays perfectly well if I explicitly choose it.
How can I see which of the videos the player actually chooses for "Auto"? Can I influence it to make a more reasonable choice?
Thanks,
David Haimson
