Commit 75686dee authored by Ulrike Uhlig's avatar Ulrike Uhlig
Browse files

Merge branch 'master' of

parents 4376435a 59fb6bf7
......@@ -62,13 +62,19 @@ User experience
Hot topics on our help desk
XXX: Ask to list hot topics for the last month.
Help desk has seen the same issues than last month:
1. Users are still affected by [[a loss of
1. We received also several reports about [[keyboard and mouse not
working after upgrading|]]
1. A few users reported the [[disappearance of a part of their
1. And some users had [[trouble with obfs4
......@@ -29,6 +29,7 @@ Resources
- [[Survey platform (*LimeSurvey*)|user_experience/limesurvey]]
- [[Guidelines for user testing|user_experience/testing]]
- [[Recording user testing|user_experience/recording]]
- [[Preparing video clips|user_experience/clip]]
- Participant Bill of Rights (adapted from
[Simply Secure](
- [English ODT](
[[!meta title="Preparing video clips"]]
Cut out a video clip from a longer recording
ffmpeg -ss [start] -t [duration] -i [input] [output]
For example:
ffmpeg -ss 25:20 -t 10 -an -i P4.ogv clip.webm
Amplify the audio in a video clip
ffmpeg -i [input] -af "volume=25dB" [output]
For example:
ffmpeg -i clip.webm -af "volume=25dB" clip-amplified.webm
Remove the sound in a video clip
ffmpeg -i [input] -an [output]
For example:
ffmpeg clip.webm -an clip-nosound.webm
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