I just did youtube-dl https://www.youtube.com/watch?v=IwoHkXqHTCc and then
played it with VLC without issue. Make sure you youtube-dl is updated and
try again without the extra options.

On Wed, Mar 16, 2016 at 7:57 AM, Michael <bmike1@gmail.com> wrote:

> Well, I'm attempting to download a you tube video so I type:
>
>   $ youtube-dl -o Darktable-1-Getting-Started "
> https://www.youtube.com/watch?v=IwoHkXqHTCc"
> [youtube] IwoHkXqHTCc: Downloading webpage
> [youtube] IwoHkXqHTCc: Downloading video info webpage
> [youtube] IwoHkXqHTCc: Extracting video information
> [youtube] IwoHkXqHTCc: Downloading DASH manifest
> [download] Destination: Darktable-1-Getting-Started.f271
> [download] 100% of 69.56MiB in 00:09
> [download] Destination: Darktable-1-Getting-Started.f251
> [download] 100% of 5.44MiB in 00:00
> [ffmpeg] Merging formats into "Darktable-1-Getting-Started.webm"
> Deleting original file Darktable-1-Getting-Started.f271 (pass -k to keep)
> Deleting original file Darktable-1-Getting-Started.f251 (pass -k to keep)
>
> but when I try to view the video  this error appears:
>
> No suitable decoder module:
>
> VLC does not support the audio or video format "VP90". Unfortunately there
> is no way for you to fix this.
>
> No suitable decoder module:
>
> VLC does not support the audio or video format "undf". Unfortunately there
> is no way for you to fix this.
>
>
> so I looked at the man page  and found --recode-video so I figured I'd try
> that.
>
>
>  $ youtube-dl -o Darktable-1-Getting-Started "
> https://www.youtube.com/watch?v=IwoHkXqHTCc" --recode-video mp4
> [youtube] IwoHkXqHTCc: Downloading webpage
> [youtube] IwoHkXqHTCc: Downloading video info webpage
> [youtube] IwoHkXqHTCc: Extracting video information
> [youtube] IwoHkXqHTCc: Downloading DASH manifest
> [download] Darktable-1-Getting-Started.webm has already been downloaded
> and merged
> [ffmpeg] Converting video from webm to mp4, Destination:
> Darktable-1-Getting-Started.mp4
> ERROR: [aac @ 0x1465460] The encoder 'aac' is experimental but
> experimental codecs are not enabled, add '-strict -2' if you want to use it.
>
> When I look in the file's folder I see two files have been created, an mp4
> file and a webm file. When I open the mp4 (the icon of which shows a clock
> on a checker field) file nothing happens. When I try to open the webm file
> (the icon of which is a video frame) the previously mentioned error appears
> and the the progress bar starts counting up.
>
> So I think that too get help I better open the files from the terminal to
> get a proper error:
>
> $ vlc *webm
> VLC media player 2.1.6 Rincewind (revision 2.1.6-0-gea01d28)
> [0xf4c118] main libvlc: Running vlc with the default interface. Use 'cvlc'
> to use vlc without interface.
> "sni-qt/11052" WARN  10:51:50.389 void
> StatusNotifierItemFactory::connectToSnw() Invalid interface to SNW_SERVICE
> [0x7f4010c01968] mkv demux error: unknown codec id=`A_OPUS'
> [0x7f4010c0bbe8] main decoder error: no suitable decoder module for fourcc
> `VP90'. VLC probably does not support this sound or video format.
> [0x7f4010c0bbe8] main decoder error: no suitable decoder module for fourcc
> `undf'. VLC probably does not support this sound or video format.
>
> $ vlc *mp4
> VLC media player 2.1.6 Rincewind (revision 2.1.6-0-gea01d28)
> [0x1790118] main libvlc: Running vlc with the default interface. Use
> 'cvlc' to use vlc without interface.
> "sni-qt/11040" WARN  10:49:31.678 void
> StatusNotifierItemFactory::connectToSnw() Invalid interface to SNW_SERVICE
> [0x7fe33c0012e8] main stream error: cannot pre fill buffer
>
> --
> :-)~MIKE~(-:
>
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