Waveform generation takes very long

opencast / opencast-editor

Web-based video editor for Opencast

https://editor.opencast.org

Apache License 2.0

56 stars 43 forks source link

Waveform generation takes very long #347

Open Arnei opened 3 years ago

Arnei commented 3 years ago

For a 1:15 hour long video, the waveform took 40 seconds to generate. Also, it is not cached on reload. -Innsbruck

Arnei commented 3 years ago

Main problem here seems to be that the frontend has to download the whole video file before it can start generating anything, which may take quite a bit for larger files.

Possible solutions:

Send considerably smaller preview versions of the videos to the editor (instead of fullHD)
Have Opencast create a compressed audio file, which can then be used by the frontend for waveform generation.
Go back to Opencast generating the waveform

Melanie-Koller commented 3 years ago

For really long videos (07:00) you get no waveform at all.

kristofkeppens commented 2 years ago

Even for videos with a duration of around 3:00:00 you get no duration ( or it takes longer than I and our users are willing to wait , > 10min ). Is there a way to configure this to use the opencast waveform ?

wsmirnow commented 2 years ago

The editor preview videos are far smaller then FHD (with the default workflows). I would prefere to have an Option for Standolone Editor to select an separate Track (by flavor) for waveform generation.