Commit 97fe483e authored by sajolida's avatar sajolida
Browse files

Document how to prepare video clips from user testing recordings

parent 408daec1
......@@ -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](https://simplysecure.org/knowledge-base/)):
- [English ODT](https://github.com/sajolida/tails-ux/raw/master/tools/bill_of_rights.en.fodt)
......
[[!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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