Youtube video has no url property in JSON

[Rudloff]

When using --dump-json on some Youtube videos like https://www.youtube.com/watch?v=F-qBD17wwrQ, there is no url property in the JSON.
This causes a bug in Alltube because it expects the property to be there: Rudloff/alltube#26
Is this a normal behavior? I doesn't seem to happen with other extractors.

[dstftw]

Does not reproduce for me. Post the JSON and point where an url is missing. Post the --verbose output as well.

[Rudloff]

Here is the full output:

[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'--dump-json', u'-v', u'https://www.youtube.com/watch?v=F-qBD17wwrQ']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2015.07.28
[debug] Python version 2.7.9 - Linux-3.16.0-4-amd64-x86_64-with-debian-8.1
[debug] exe versions: avconv 11.4-6, avprobe 11.4-6, rtmpdump 2.4
[debug] Proxy map: {}
{"upload_date": "20150603", "extractor": "youtube", "height": 1080, "like_count": 9188, "duration": 155, "fulltitle": "Mission: Impossible Rogue Nation Trailer 2", "id": "F-qBD17wwrQ", "requested_formats": [{"asr": null, "tbr": 3470, "format": "137 - 1920x1080 (DASH video)", "url": "https://r5---sn-4gxx-25gl.googlevideo.com/videoplayback?id=17ea810f5ef0c2b4&itag=137&source=youtube&requiressl=yes&mn=sn-4gxx-25gl&pl=26&mm=31&ms=au&mv=m&ratebypass=yes&mime=video/mp4&gir=yes&clen=39451312&lmt=1433482558601393&dur=154.821&upn=SGmoS1I8hpM&key=dg_yt0&fexp=9406010,9407662,9408710,9415092,9415365,9415485,9416105,9416126,9416268,9417278,9417762,9418201&signature=8B68FAABA0F0FF74CC6EC01D4F4B102B5D4E2402.298C462F605263798BEAEB7E370996FD130866A0&mt=1438425384&sver=3&ip=2a01:e35:8a04:870:ad46:2af5:edf9:4a45&ipbits=0&expire=1438447089&sparams=ip,ipbits,expire,id,itag,source,requiressl,mn,pl,mm,ms,mv,ratebypass,mime,gir,clen,lmt,dur", "filesize": 39451312, "vcodec": "avc1.640028", "format_note": "DASH video", "height": 1080, "width": 1920, "ext": "mp4", "preference": -40, "fps": 24, "format_id": "137", "http_headers": {"Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7", "Accept-Language": "en-us,en;q=0.5", "Accept-Encoding": "gzip, deflate", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", "User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20150101 Firefox/20.0 (Chrome)"}, "acodec": "none"}, {"asr": 44100, "tbr": 127, "container": "m4a_dash", "format": "140 - audio only (DASH audio)", "url": "https://r5---sn-4gxx-25gl.googlevideo.com/videoplayback?id=17ea810f5ef0c2b4&itag=140&source=youtube&requiressl=yes&mn=sn-4gxx-25gl&pl=26&mm=31&ms=au&mv=m&ratebypass=yes&mime=audio/mp4&gir=yes&clen=2460439&lmt=1433482405214073&dur=154.877&upn=SGmoS1I8hpM&key=dg_yt0&fexp=9406010,9407662,9408710,9415092,9415365,9415485,9416105,9416126,9416268,9417278,9417762,9418201&signature=3BCCB33CF094120F4FC693D4BD52DB24AFDFFF3A.712FCF257CCCE0C5BD554F35942CC9DD936C7F83&mt=1438425384&sver=3&ip=2a01:e35:8a04:870:ad46:2af5:edf9:4a45&ipbits=0&expire=1438447089&sparams=ip,ipbits,expire,id,itag,source,requiressl,mn,pl,mm,ms,mv,ratebypass,mime,gir,clen,lmt,dur", "filesize": 2460439, "vcodec": "none", "format_note": "DASH audio", "abr": 128, "height": null, "width": null, "ext": "m4a", "preference": -50, "fps": null, "format_id": "140", "http_headers": {"Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7", "Accept-Language": "en-us,en;q=0.5", "Accept-Encoding": "gzip, deflate", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", "User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20150101 Firefox/20.0 (Chrome)"}, "acodec": "aac"}], "view_count": 5808313, "playlist": null, "title": "Mission: Impossible Rogue Nation Trailer 2", "_filename": "Mission - Impossible Rogue Nation Trailer 2-F-qBD17wwrQ.mp4", "ext": "mp4", "playlist_index": null, "dislike_count": 452, "average_rating": 4.81244802475, "abr": 128, "subtitles": {}, "fps": 24, "stretched_ratio": null, "age_limit": 0, "thumbnail": "https://i.ytimg.com/vi/F-qBD17wwrQ/maxresdefault.jpg", "webpage_url_basename": "watch", "acodec": "aac", "display_id": "F-qBD17wwrQ", "automatic_captions": {}, "description": "Tom Cruise is back as Ethan Hunt in Mission: Impossible Rogue Nation. In theaters July 31st, get tickets: http://MissionImpossible.com", "format": "137 - 1920x1080 (DASH video)+140 - audio only (DASH audio)", "requested_subtitles": null, "start_time": null, "uploader": "Mission Impossible", "format_id": "137+140", "uploader_id": "MissionImpossible", "categories": ["Film & Animation"], "thumbnails": [{"url": "https://i.ytimg.com/vi/F-qBD17wwrQ/maxresdefault.jpg", "id": "0"}], "extractor_key": "Youtube", "vcodec": "avc1.640028", "annotations": null, "vbr": null, "is_live": null, "end_time": null, "webpage_url": "https://www.youtube.com/watch?v=F-qBD17wwrQ", "formats": [{"http_headers": {"Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7", "Accept-Language": "en-us,en;q=0.5", "Accept-Encoding": "gzip, deflate", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", "User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20150101 Firefox/20.0 (Chrome)"}, "format": "249 - audio only (DASH audio)", "url": "https://r17---sn-4g57km76.googlevideo.com/videoplayback?requiressl=yes&sver=3&ip=2a01%3Ae35%3A8a04%3A870%3Aad46%3A2af5%3Aedf9%3A4a45&nh=EAM&sparams=clen%2Cdur%2Cgir%2Cid%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cnh%2Cpl%2Crequiressl%2Csource%2Cupn%2Cexpire&gir=yes&mt=1438421528&clen=895604&key=yt5&lmt=1433378250943589&upn=3Mi_gXKsyHc&expire=1438447088&mm=35&ipbits=0&mn=sn-4g57km76&itag=249&dur=154.821&id=o-ALLBGsOmo8vb5_HKJXq4UFZ0QLVehoKgsh3G5cIFztls&pl=26&source=youtube&mv=s&mime=audio%2Fwebm&ms=pm&signature=8E62085C709C16931B3F0DDBAABC0BFB1F45176C.7AF6FA692B431B72985CDF9363F4963E3DA5487C&fexp=9406010%2C9407662%2C9408710%2C9415092%2C9415365%2C9415485%2C9416105%2C9416126%2C9416268%2C9417278%2C9417762%2C9418201&keepalive=yes&ratebypass=yes", "vcodec": "none", "format_note": "DASH audio", "abr": 50, "player_url": null, "ext": "webm", "preference": -50, "format_id": "249", "acodec": "opus"}, {"http_headers": {"Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7", "Accept-Language": "en-us,en;q=0.5", "Accept-Encoding": "gzip, deflate", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", "User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20150101 Firefox/20.0 (Chrome)"}, "format": "250 - audio only (DASH audio)", "url": "https://r17---sn-4g57km76.googlevideo.com/videoplayback?requiressl=yes&sver=3&ip=2a01%3Ae35%3A8a04%3A870%3Aad46%3A2af5%3Aedf9%3A4a45&nh=EAM&sparams=clen%2Cdur%2Cgir%2Cid%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cnh%2Cpl%2Crequiressl%2Csource%2Cupn%2Cexpire&gir=yes&mt=1438421528&clen=1139966&key=yt5&lmt=1433378268688675&upn=3Mi_gXKsyHc&expire=1438447088&mm=35&ipbits=0&mn=sn-4g57km76&itag=250&dur=154.821&id=o-ALLBGsOmo8vb5_HKJXq4UFZ0QLVehoKgsh3G5cIFztls&pl=26&source=youtube&mv=s&mime=audio%2Fwebm&ms=pm&signature=413A223ED2FDE5BEA3782FBAAD5493575D6A706C.BDA78801AC2360D5B28DB85D1BE10E70394C738F&fexp=9406010%2C9407662%2C9408710%2C9415092%2C9415365%2C9415485%2C9416105%2C9416126%2C9416268%2C9417278%2C9417762%2C9418201&keepalive=yes&ratebypass=yes", "vcodec": "none", "format_note": "DASH audio", "abr": 70, "player_url": null, "ext": "webm", "preference": -50, "format_id": "250", "acodec": "opus"}, {"http_headers": {"Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7", "Accept-Language": "en-us,en;q=0.5", "Accept-Encoding": "gzip, deflate", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", "User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20150101 Firefox/20.0 (Chrome)"}, "format": "251 - audio only (DASH audio)", "url": "https://r17---sn-4g57km76.googlevideo.com/videoplayback?requiressl=yes&sver=3&ip=2a01%3Ae35%3A8a04%3A870%3Aad46%3A2af5%3Aedf9%3A4a45&nh=EAM&sparams=clen%2Cdur%2Cgir%2Cid%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cnh%2Cpl%2Crequiressl%2Csource%2Cupn%2Cexpire&gir=yes&mt=1438421528&clen=2229871&key=yt5&lmt=1433378299552169&upn=3Mi_gXKsyHc&expire=1438447088&mm=35&ipbits=0&mn=sn-4g57km76&itag=251&dur=154.821&id=o-ALLBGsOmo8vb5_HKJXq4UFZ0QLVehoKgsh3G5cIFztls&pl=26&source=youtube&mv=s&mime=audio%2Fwebm&ms=pm&signature=03581761FD0DEE530D171AEA5E31F567B28AB0AA.A0A864C5A2F29081F563BDB8384E82927D5262FA&fexp=9406010%2C9407662%2C9408710%2C9415092%2C9415365%2C9415485%2C9416105%2C9416126%2C9416268%2C9417278%2C9417762%2C9418201&keepalive=yes&ratebypass=yes", "vcodec": "none", "format_note": "DASH audio", "abr": 160, "player_url": null, "ext": "webm", "preference": -50, "format_id": "251", "acodec": "opus"}, {"asr": 44100, "tbr": 120, "format": "171 - audio only (DASH audio)", "url": "https://r5---sn-4gxx-25gl.googlevideo.com/videoplayback?id=17ea810f5ef0c2b4&itag=171&source=youtube&requiressl=yes&mn=sn-4gxx-25gl&pl=26&mm=31&ms=au&mv=m&ratebypass=yes&mime=audio/webm&gir=yes&clen=2018879&lmt=1433378255299045&dur=154.826&upn=SGmoS1I8hpM&key=dg_yt0&fexp=9406010,9407662,9408710,9415092,9415365,9415485,9416105,9416126,9416268,9417278,9417762,9418201&signature=2465A5A7F71754985B584C44BA52471F5ADE5AD6.35CA1695A29E5513782A46195448B67D6D0C322E&mt=1438425384&sver=3&ip=2a01:e35:8a04:870:ad46:2af5:edf9:4a45&ipbits=0&expire=1438447089&sparams=ip,ipbits,expire,id,itag,source,requiressl,mn,pl,mm,ms,mv,ratebypass,mime,gir,clen,lmt,dur", "vcodec": "none", "format_note": "DASH audio", "ext": "webm", "height": null, "width": null, "abr": 128, "preference": -50, "fps": null, "format_id": "171", "acodec": "vorbis", "http_headers": {"Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7", "Accept-Language": "en-us,en;q=0.5", "Accept-Encoding": "gzip, deflate", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", "User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20150101 Firefox/20.0 (Chrome)"}, "filesize": 2018879}, {"asr": 44100, "tbr": 127, "container": "m4a_dash", "format": "140 - audio only (DASH audio)", "url": "https://r5---sn-4gxx-25gl.googlevideo.com/videoplayback?id=17ea810f5ef0c2b4&itag=140&source=youtube&requiressl=yes&mn=sn-4gxx-25gl&pl=26&mm=31&ms=au&mv=m&ratebypass=yes&mime=audio/mp4&gir=yes&clen=2460439&lmt=1433482405214073&dur=154.877&upn=SGmoS1I8hpM&key=dg_yt0&fexp=9406010,9407662,9408710,9415092,9415365,9415485,9416105,9416126,9416268,9417278,9417762,9418201&signature=3BCCB33CF094120F4FC693D4BD52DB24AFDFFF3A.712FCF257CCCE0C5BD554F35942CC9DD936C7F83&mt=1438425384&sver=3&ip=2a01:e35:8a04:870:ad46:2af5:edf9:4a45&ipbits=0&expire=1438447089&sparams=ip,ipbits,expire,id,itag,source,requiressl,mn,pl,mm,ms,mv,ratebypass,mime,gir,clen,lmt,dur", "filesize": 2460439, "vcodec": "none", "format_note": "DASH audio", "abr": 128, "height": null, "width": null, "ext": "m4a", "preference": -50, "fps": null, "format_id": "140", "http_headers": {"Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7", "Accept-Language": "en-us,en;q=0.5", "Accept-Encoding": "gzip, deflate", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", "User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20150101 Firefox/20.0 (Chrome)"}, "acodec": "aac"}, {"asr": null, "tbr": 94, "container": "webm", "format": "278 - 256x144 (DASH video)", "url": "https://r5---sn-4gxx-25gl.googlevideo.com/videoplayback?id=17ea810f5ef0c2b4&itag=278&source=youtube&requiressl=yes&mn=sn-4gxx-25gl&pl=26&mm=31&ms=au&mv=m&ratebypass=yes&mime=video/webm&gir=yes&clen=1523095&lmt=1433378282080972&dur=154.737&upn=SGmoS1I8hpM&key=dg_yt0&fexp=9406010,9407662,9408710,9415092,9415365,9415485,9416105,9416126,9416268,9417278,9417762,9418201&signature=39A3CCAAA2CC8D059AA1EDCA33BEB19ECF41B0B8.5464C10E9BB8090518463B2B865FA441767669DF&mt=1438425384&sver=3&ip=2a01:e35:8a04:870:ad46:2af5:edf9:4a45&ipbits=0&expire=1438447089&sparams=ip,ipbits,expire,id,itag,source,requiressl,mn,pl,mm,ms,mv,ratebypass,mime,gir,clen,lmt,dur", "filesize": 1523095, "vcodec": "vp9", "format_note": "DASH video", "height": 144, "width": 256, "ext": "webm", "preference": -40, "fps": 12, "format_id": "278", "http_headers": {"Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7", "Accept-Language": "en-us,en;q=0.5", "Accept-Encoding": "gzip, deflate", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", "User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20150101 Firefox/20.0 (Chrome)"}, "acodec": "none"}, {"asr": null, "tbr": 110, "format": "160 - 256x144 (DASH video)", "url": "https://r5---sn-4gxx-25gl.googlevideo.com/videoplayback?id=17ea810f5ef0c2b4&itag=160&source=youtube&requiressl=yes&mn=sn-4gxx-25gl&pl=26&mm=31&ms=au&mv=m&ratebypass=yes&mime=video/mp4&gir=yes&clen=2032948&lmt=1433482417235838&dur=154.821&upn=SGmoS1I8hpM&key=dg_yt0&fexp=9406010,9407662,9408710,9415092,9415365,9415485,9416105,9416126,9416268,9417278,9417762,9418201&signature=71444D05A4079C49A2DCC3B22A64A453B13ED9DB.2EE53FE3D1D73DB05524AE0143FBA826EE8ACA40&mt=1438425384&sver=3&ip=2a01:e35:8a04:870:ad46:2af5:edf9:4a45&ipbits=0&expire=1438447089&sparams=ip,ipbits,expire,id,itag,source,requiressl,mn,pl,mm,ms,mv,ratebypass,mime,gir,clen,lmt,dur", "filesize": 2032948, "vcodec": "avc1.4d400c", "format_note": "DASH video", "height": 144, "width": 256, "ext": "mp4", "preference": -40, "fps": 12, "format_id": "160", "http_headers": {"Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7", "Accept-Language": "en-us,en;q=0.5", "Accept-Encoding": "gzip, deflate", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", "User-Agent": "Mozilla/5.0 (X11; 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Linux x86_64; rv:10.0) Gecko/20150101 Firefox/20.0 (Chrome)"}, "player_url": null}, {"width": 640, "ext": "webm", "format": "43 - 640x360", "url": "https://r17---sn-4g57km76.googlevideo.com/videoplayback?requiressl=yes&sver=3&ip=2a01%3Ae35%3A8a04%3A870%3Aad46%3A2af5%3Aedf9%3A4a45&nh=EAM&sparams=dur%2Cid%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cnh%2Cpl%2Cratebypass%2Crequiressl%2Csource%2Cupn%2Cexpire&mt=1438421528&key=yt5&lmt=1433378268761158&upn=3Mi_gXKsyHc&expire=1438447088&mm=35&ipbits=0&mn=sn-4g57km76&itag=43&dur=0.000&id=o-ALLBGsOmo8vb5_HKJXq4UFZ0QLVehoKgsh3G5cIFztls&pl=26&source=youtube&mv=s&mime=video%2Fwebm&ms=pm&signature=0C9B7218FAA75FC3E28BB7E536E0CC95155DF839.76D6585ECCC9F08D7FBD8332309C74A77E591EAC&fexp=9406010%2C9407662%2C9408710%2C9415092%2C9415365%2C9415485%2C9416105%2C9416126%2C9416268%2C9417278%2C9417762%2C9418201&ratebypass=yes", "format_id": "43", "height": 360, "http_headers": {"Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7", "Accept-Language": "en-us,en;q=0.5", "Accept-Encoding": "gzip, deflate", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", "User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20150101 Firefox/20.0 (Chrome)"}, "player_url": null}, {"width": 640, "ext": "mp4", "format": "18 - 640x360", "url": "https://r17---sn-4g57km76.googlevideo.com/videoplayback?requiressl=yes&sver=3&ip=2a01%3Ae35%3A8a04%3A870%3Aad46%3A2af5%3Aedf9%3A4a45&nh=EAM&sparams=dur%2Cid%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cnh%2Cpl%2Cratebypass%2Crequiressl%2Csource%2Cupn%2Cexpire&mt=1438421528&key=yt5&lmt=1433482464335446&upn=3Mi_gXKsyHc&expire=1438447088&mm=35&ipbits=0&mn=sn-4g57km76&itag=18&dur=154.877&id=o-ALLBGsOmo8vb5_HKJXq4UFZ0QLVehoKgsh3G5cIFztls&pl=26&source=youtube&mv=s&mime=video%2Fmp4&ms=pm&signature=4F9A25AE4EBAF7542B1B244C6390F88FE427D63B.71C3746DE1BDD501EF93AAF86238CBE120B20622&fexp=9406010%2C9407662%2C9408710%2C9415092%2C9415365%2C9415485%2C9416105%2C9416126%2C9416268%2C9417278%2C9417762%2C9418201&ratebypass=yes", "format_id": "18", "height": 360, "http_headers": {"Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7", "Accept-Language": "en-us,en;q=0.5", "Accept-Encoding": "gzip, deflate", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", "User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20150101 Firefox/20.0 (Chrome)"}, "player_url": null}, {"width": 1280, "ext": "mp4", "format": "22 - 1280x720", "url": "https://r17---sn-4g57km76.googlevideo.com/videoplayback?requiressl=yes&sver=3&ip=2a01%3Ae35%3A8a04%3A870%3Aad46%3A2af5%3Aedf9%3A4a45&nh=EAM&sparams=dur%2Cid%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cnh%2Cpl%2Cratebypass%2Crequiressl%2Csource%2Cupn%2Cexpire&mt=1438421528&key=yt5&lmt=1433482465700423&upn=3Mi_gXKsyHc&expire=1438447088&mm=35&ipbits=0&mn=sn-4g57km76&itag=22&dur=154.877&id=o-ALLBGsOmo8vb5_HKJXq4UFZ0QLVehoKgsh3G5cIFztls&pl=26&source=youtube&mv=s&mime=video%2Fmp4&ms=pm&signature=C2F2FC88DC142520EF2AB7A0BC490D81C8AF2E5F.E4C73A1DC82EDF26DAAE169A9895DE2909BD484C&fexp=9406010%2C9407662%2C9408710%2C9415092%2C9415365%2C9415485%2C9416105%2C9416126%2C9416268%2C9417278%2C9417762%2C9418201&ratebypass=yes", "format_id": "22", "height": 720, "http_headers": {"Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7", "Accept-Language": "en-us,en;q=0.5", "Accept-Encoding": "gzip, deflate", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", "User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20150101 Firefox/20.0 (Chrome)"}, "player_url": null}], "resolution": null, "width": 1920}

There are url properties in requested_formats and formats but not at the root of the JSON object.

[dstftw]

This is expected. There is an url when there are no formats and vice versa.

[jaimeMF]

Note that this is because if you have avconv/ffmpeg installed it defaults to -f bestvideo+bestaudio/best, you can force to get a single format using -f best.

[Rudloff]

Thanks @jaimeMF! This option is exactly what I needed.