我正在创建一个Android应用程序，用于下载不同格式的Facebook视频。我使用了Facebook Webview来加载Facebook页面，并遵循下面链接中描述的方法，
How to detect video in Android WebView with HitTestResult?
如上所述，使用javascript函数直接下载了视频。
$.getJSON( "Scripts/Homepage.json", function( data ) {
for (var i = 0; i < 2; i++) {
$($(".recipe").get(i)).attr("data-recipe", data.Recipes[i]);
let recipe = $($(".recipe").get(i)).attr("data-recipe");
$.getJSON( "Posts/" + recipe + ".json", function( data ) {
$($(".recipe").get(i)).css({
background: "url('" + data.Images[0] + "')",
backgroundSize: "cover",
backgroundRepeat: "no-repeat"
});
});
}
}
界面处理视频
webView.loadUrl("javascript:(function() { "
+ "var el = document.querySelectorAll('div[data-sigil]');"
+ "for(var i=0;i<el.length; i++)"
+ "{"
+ "var sigil = el[i].dataset.sigil;"
+ "if(sigil.indexOf('inlineVideo') > -1){"
+ "delete el[i].dataset.sigil;"
+ "var jsonData = JSON.parse(el[i].dataset.store);"
+ "el[i].setAttribute('onClick', 'FBDownloader.processVideo(\"'+jsonData['src']+'\");');"
+ "}" + "}" + "})()");
工作正常。现在，我需要通过提供不同格式（360p / 720p）的下载选项来下载该视频。我可以使用上述方法成功完成此操作，还是有其他方法可以完成此操作？
任何人都可以提出任何建议的方法。
提前谢谢！
答案 0 :(得分：0)
您可以获得不同分辨率的直接下载 URL（如果可用）。为此，您必须解析数据存储属性，它是一个 json 及其名为“dashManifest”的属性之一，其中包含一个 XML 作为字符串。只需在名为 BaseUrl 的标记中解析此 XML 以及 XML 中存在的所有分辨率视频 URL
注意：Facebook 分别流式传输视频和音频，您可以通过解析的 XML.Comment 中存在的“type”标签获取媒体类型，如果您需要了解任何特定信息
下面我附上了一个来自 facebook 的示例解析 xml
<?xml version="1.0"?>
<MPD xmlns="urn:mpeg:dash:schema:mpd:2011" minBufferTime="PT1.500S" type="static"
mediaPresentationDuration="PT0H12M21.578S" maxSegmentDuration="PT0H0M2.033S"
profiles="urn:mpeg:dash:profile:isoff-on-demand:2011,http://dashif.org/guidelines/dash264"
FBTagsetUsed="waslive_oil">
<Period duration="PT0H12M21.578S">
<AdaptationSet segmentAlignment="true" maxWidth="1280" maxHeight="720" maxFrameRate="16000/533" par="16:9"
lang="und" subsegmentAlignment="true" subsegmentStartsWithSAP="1">
<Representation id="880896686086627v" mimeType="video/mp4" codecs="avc1.64001E" width="640" height="360"
frameRate="16000/528" sar="1:1" startWithSAP="1" bandwidth="288708"
FBEncodingTag="dash_live_md_oil_frag_2_video" FBDefaultQuality="1" FBQualityClass="sd"
FBQualityLabel="360p">
<BaseURL>
https://video.fdac31-1.fna.fbcdn.net/v/t58.24163-29/10000000_179254480691335_3242136310202854043_n.mp4?_nc_cat=1&ccb=1-3&_nc_sid=5aebc0&efg=eyJ2ZW5jb2RlX3RhZyI6ImRhc2hfbGl2ZV9tZF9vaWxfZnJhZ18yX3ZpZGVvIn0\u00253D&_nc_eui2=AeH4byTCXnuom722rB1t739m4RczjfwaJOnhFzON_Bok6WesjemJvf6AAXS-mIT2BaBeZdnTgbpxuLfqIROCxPXb&_nc_ohc=pq27eyexXE0AX9Y8aBL&_nc_ht=video.fdac31-1.fna&oh=b6cd1a7f9558b6552a0fd731f26b0c41&oe=607865F2
</BaseURL>
<SegmentBase indexRangeExact="true" indexRange="928-5411" FBFirstSegmentRange="5412-88286">
<Initialization range="0-927"/>
</SegmentBase>
</Representation>
<Representation id="1101470673682649v" mimeType="video/mp4" codecs="avc1.64000C" width="256" height="144"
frameRate="16000/528" sar="1:1" startWithSAP="1" bandwidth="76590"
FBEncodingTag="dash_live_qd_oil_frag_2_video" FBQualityClass="sd" FBQualityLabel="144p">
<BaseURL>
https://video.fdac31-1.fna.fbcdn.net/v/t58.24163-29/76771638_778389546126581_1271211815320306451_n.mp4?_nc_cat=1&ccb=1-3&_nc_sid=5aebc0&efg=eyJ2ZW5jb2RlX3RhZyI6ImRhc2hfbGl2ZV9xZF9vaWxfZnJhZ18yX3ZpZGVvIn0\u00253D&_nc_eui2=AeFCKcOeKvIqKh_OTPp7yNRKsRqS5DYzKsyxGpLkNjMqzImp7Xnr27oPkGGzdSSAXuxSauuJYU0rOJxq-2_JFfoX&_nc_ohc=Bjvx6YMJGvEAX-ti9W2&tn=BOH45pToIKt2Dbpq&_nc_ht=video.fdac31-1.fna&oh=a92701eb9f939d734db1c7c034665313&oe=6078235E
</BaseURL>
<SegmentBase indexRangeExact="true" indexRange="927-5410" FBFirstSegmentRange="5411-26561">
<Initialization range="0-926"/>
</SegmentBase>
</Representation>
<Representation id="469136657731404v" mimeType="video/mp4" codecs="avc1.640015" width="426" height="240"
frameRate="16000/528" sar="640:639" startWithSAP="1" bandwidth="154843"
FBEncodingTag="dash_live_ld_oil_frag_2_video" FBQualityClass="sd" FBQualityLabel="240p">
<BaseURL>
https://video.fdac31-1.fna.fbcdn.net/v/t58.24163-29/10000000_121549116680806_1261374129181920154_n.mp4?_nc_cat=1&ccb=1-3&_nc_sid=5aebc0&efg=eyJ2ZW5jb2RlX3RhZyI6ImRhc2hfbGl2ZV9sZF9vaWxfZnJhZ18yX3ZpZGVvIn0\u00253D&_nc_eui2=AeGHNRTrop4K87EwJDlkLqGaIJNadRZXbR0gk1p1FldtHWEqbrV7WWYlJ0KTwTD5829mDcWW7xE9QBYvfaFEyV_G&_nc_ohc=lKamnYKfkFUAX-NxcVE&_nc_ht=video.fdac31-1.fna&oh=909496cb650e5a973a1cbfe4c9fa5167&oe=6077EAB6
</BaseURL>
<SegmentBase indexRangeExact="true" indexRange="932-5415" FBFirstSegmentRange="5416-46569">
<Initialization range="0-931"/>
</SegmentBase>
</Representation>
<Representation id="152826476763600v" mimeType="video/mp4" codecs="avc1.64001F" width="854" height="480"
frameRate="16000/528" sar="1280:1281" startWithSAP="1" bandwidth="436215"
FBEncodingTag="dash_live_hd_oil_frag_2_video" FBQualityClass="sd" FBQualityLabel="480p">
<BaseURL>
https://video.fdac31-1.fna.fbcdn.net/v/t58.24163-29/10000000_934480347363374_9003012336395628607_n.mp4?_nc_cat=1&ccb=1-3&_nc_sid=5aebc0&efg=eyJ2ZW5jb2RlX3RhZyI6ImRhc2hfbGl2ZV9oZF9vaWxfZnJhZ18yX3ZpZGVvIn0\u00253D&_nc_eui2=AeHWeziPmGVax0rZ5aFWmpeB3F4VGRMQEc7cXhUZExARzuYzBCqh6L_a6cNgKvlavKMhwBDxGzS6e0r7g5Hr-jOW&_nc_ohc=tGdSfqiLRXkAX-tbpqT&_nc_ht=video.fdac31-1.fna&oh=6cf9419a0ca3e002aed595cc708b2eef&oe=60786117
</BaseURL>
<SegmentBase indexRangeExact="true" indexRange="932-5415" FBFirstSegmentRange="5416-128976">
<Initialization range="0-931"/>
</SegmentBase>
</Representation>
<Representation id="355054559276561v" mimeType="video/mp4" codecs="avc1.640020" width="1280" height="720"
frameRate="16000/528" sar="1:1" startWithSAP="1" bandwidth="845834"
FBEncodingTag="dash_live_hd1_oil_frag_2_video" FBQualityClass="hd" FBQualityLabel="720p">
<BaseURL>
https://video.fdac31-1.fna.fbcdn.net/v/t58.24163-29/10000000_1074895653020521_3692007604683059549_n.mp4?_nc_cat=1&ccb=1-3&_nc_sid=5aebc0&efg=eyJ2ZW5jb2RlX3RhZyI6ImRhc2hfbGl2ZV9oZDFfb2lsX2ZyYWdfMl92aWRlbyJ9&_nc_eui2=AeE1oD3Xw4kbP72LNiWv_mxAY9khJAs1u1Zj2SEkCzW7Vk3IaKu0VBbRs4ikLF7QQCC99ppzjqASVjeJma8tbUkD&_nc_ohc=JhayX18zZtEAX-SrKzu&_nc_ht=video.fdac31-1.fna&oh=9996495236e41ef0574474e6abf29133&oe=607817A0
</BaseURL>
<SegmentBase indexRangeExact="true" indexRange="928-5411" FBFirstSegmentRange="5412-278017">
<Initialization range="0-927"/>
</SegmentBase>
</Representation>
</AdaptationSet>
<AdaptationSet segmentAlignment="true" lang="und" subsegmentAlignment="true" subsegmentStartsWithSAP="1">
<Representation id="291404125892378a" mimeType="audio/mp4" codecs="mp4a.40.5" audioSamplingRate="48000"
startWithSAP="1" bandwidth="65319" FBEncodingTag="dash_live_md_oil_frag_2_audio"
FBDefaultQuality="1">
<AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011"
value="2"/>
<BaseURL>
https://video.fdac31-1.fna.fbcdn.net/v/t58.24163-29/100290040_2846605672321798_3199708896663502649_n.mp4?_nc_cat=1&ccb=1-3&_nc_sid=5aebc0&efg=eyJ2ZW5jb2RlX3RhZyI6ImRhc2hfbGl2ZV9tZF9vaWxfZnJhZ18yX2F1ZGlvIn0\u00253D&_nc_eui2=AeGMiyd-n-lk_5kQaA0001uT8KwyO9CI5ljwrDI70IjmWAlRHWBlZjVpOzZCHR5GK1x64VdIOt1x-MccAAgaTec_&_nc_ohc=Xka-_31tgsMAX_y3sKK&_nc_ht=video.fdac31-1.fna&oh=25fd4372f95db40a155ad2a195d31004&oe=6078723D
</BaseURL>
<SegmentBase indexRangeExact="true" indexRange="880-5363" FBFirstSegmentRange="5364-21468">
<Initialization range="0-879"/>
</SegmentBase>
</Representation>
</AdaptationSet>
</Period>
</MPD>