video plays in Chrome (35.0.1883.0). video plays offline, too. still no audio, BUT...
MediaInfo shows me there is no audio track for the downloaded .ogv file:
General
ID : 364188336 (0x15B512B0)
Complete name : C:\Users\Christopher\Downloads\Alexandre_Dubach,_Caprice_No._21,_Paganini.ogv.160p.ogv
Format : OGG
File size : 3.27 MiB
Writing application : ffmpeg2theora-0.27
SOURCE_OSHASH : 221da140c138bd4e
Video
ID : 1528858952 (0x5B208948)
Format : Theora
Bit rate : 158 Kbps
Width : 284 pixels
Height : 160 pixels
Display aspect ratio : 16:9
Frame rate : 15.000 fps
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.232
Writing library : Xiph.Org libtheora 1.1 20090822 (Thusnelda)
there's also the webm file (I believe the web-based player plays this by default) with still no audio:
General
Unique ID : 169356918134500365770791865341396576982 (0x7F68F4BBEB9CF9396196B24A68CAEAD6)
Complete name : C:\Users\Christopher\Downloads\Alexandre_Dubach,_Caprice_No._21,_Paganini.ogv.360p.webm
Format : WebM
Format version : Version 2
File size : 10.2 MiB
Duration : 2mn 51s
Overall bit rate : 498 Kbps
Writing application : Lavf53.21.1
Writing library : Lavf53.21.1
Video
ID : 1
Format : VP8
Codec ID : V_VP8
Bit rate : 472 Kbps
Width : 640 pixels
Height : 360 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Compression mode : Lossy
Default : Yes
Forced : No
seems like a pointless upload, if it's supposed to be of a person playing an instrument with no audio track.
EDIT: https://upload.wikimedia.org/wikipedia/en/5...2C_Paganini.ogv
there is audio there. plays in Chrome, version above. got that link from the line that reads "Original file", just under the video. must be a mediawiki mishap on conversion to the webm and other resolutions. I have not downloaded the file to double check that the audio actually is Opus.