[szenik.eu] Download wrong video

[morris-classical]

Attempted to download a live opera video from
http://www.szenik.eu/de/Szenik-live/Klassik/arminio

A video is in fact downloaded, but not the opera I wanted: just a short "trailer" movie with monthly news. A "WARNING: Falling back on generic information extractor" makes me suppose that this site is not supported yet. I'd be grateful if you could help.

Here's a full transcript:

youtube-dl --verbose "http://www.szenik.eu/de/Szenik-live/Klassik/arminio"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'http://www.szenik.eu/de/Szenik-live/Klassik/arminio']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.03.07
[debug] Python version 2.7.2 - Darwin-15.6.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 2.2.4, rtmpdump 2.4
[debug] Proxy map: {}
[generic] arminio: Requesting header
WARNING: Falling back on generic information extractor.
[generic] arminio: Downloading webpage
[generic] arminio: Extracting information
[download] Downloading playlist: Arminio I Georg Friedrich Händel I Oper in voller Länge
[generic] playlist Arminio I Georg Friedrich Händel I Oper in voller Länge: Collected 1 video ids (downloading 1 of them)
[download] Downloading video 1 of 1
[youtube] BRqLX699hCE: Downloading webpage
[youtube] BRqLX699hCE: Downloading video info webpage
[youtube] BRqLX699hCE: Extracting video information
[youtube] {22} signature length 40.40, html5 player en_US-vflOnuOF-
[youtube] {43} signature length 40.40, html5 player en_US-vflOnuOF-
[youtube] {18} signature length 40.40, html5 player en_US-vflOnuOF-
[youtube] {36} signature length 40.40, html5 player en_US-vflOnuOF-
[youtube] {17} signature length 40.40, html5 player en_US-vflOnuOF-
[youtube] BRqLX699hCE: Downloading MPD manifest
[debug] Invoking downloader on u'https://r8---sn-fpoq-4jvz.googlevideo.com/videoplayback/id/051a8b5faf7d8421/itag/136/source/youtube/requiressl/yes/pl/16/mn/sn-fpoq-4jvz/mm/31/ms/au/mv/m/ei/9QvBWKf7OcKUWsaWouAL/initcwndbps/847500/pcm2cms/yes/ratebypass/yes/mime/video%2Fmp4/otfp/1/gir/yes/clen/8696486/lmt/1488383796379055/dur/61.694/mt/1489046486/upn/5ZKcv1rZmDg/signature/44897AC8A0C3894102222403E182DECCDAAB6981.912B120D2468AC295B31103CCE43831AEFE3656A/key/dg_yt0/ip/151.15.88.167/ipbits/0/expire/1489068118/sparams/ip,ipbits,expire,id,itag,source,requiressl,pl,mn,mm,ms,mv,ei,initcwndbps,pcm2cms,ratebypass,mime,otfp,gir,clen,lmt,dur/'
[dashsegments] Total fragments: 13
[download] Destination: Mars _ März 17-BRqLX699hCE.f136.mp4
[download] 100% of 8.29MiB in 00:06
[debug] Invoking downloader on u'https://r8---sn-fpoq-4jvz.googlevideo.com/videoplayback/id/051a8b5faf7d8421/itag/140/source/youtube/requiressl/yes/pl/16/mn/sn-fpoq-4jvz/mm/31/ms/au/mv/m/ei/9QvBWKf7OcKUWsaWouAL/initcwndbps/847500/pcm2cms/yes/ratebypass/yes/mime/audio%2Fmp4/otfp/1/gir/yes/clen/982024/lmt/1488383777748891/dur/61.741/mt/1489046486/upn/5ZKcv1rZmDg/signature/521EF913BC95368CDDCF3879513D664C3088AECD.1CB94F7D6303BC679C5AA4D7CD13BC11F0ADF049/key/dg_yt0/ip/151.15.88.167/ipbits/0/expire/1489068118/sparams/ip,ipbits,expire,id,itag,source,requiressl,pl,mn,mm,ms,mv,ei,initcwndbps,pcm2cms,ratebypass,mime,otfp,gir,clen,lmt,dur/'
[dashsegments] Total fragments: 14
[download] Destination: Mars _ März 17-BRqLX699hCE.f140.m4a
[download] 100% of 958.82KiB in 00:01
[ffmpeg] Merging formats into "Mars _ März 17-BRqLX699hCE.mp4"
[debug] ffmpeg command line: ffmpeg -y -i 'file:Mars _ März 17-BRqLX699hCE.f136.mp4' -i 'file:Mars _ März 17-BRqLX699hCE.f140.m4a' -c copy -map 0:v:0 -map 1:a:0 'file:Mars _ März 17-BRqLX699hCE.temp.mp4'
Deleting original file Mars _ März 17-BRqLX699hCE.f136.mp4 (pass -k to keep)
Deleting original file Mars _ März 17-BRqLX699hCE.f140.m4a (pass -k to keep)
[download] Finished downloading playlist: Arminio I Georg Friedrich Händel I Oper in voller Länge