openfest-video/useful-stuff.md

Useful Stuff

This file contains information, links, tools/commands that can be useful for the video team.

Testing

Test Presentation

http://tochev.net/presentation-test/

Sample RTMP Stream

ffmpeg -re -f lavfi -i testsrc=size=1920x1080:rate=30 -f lavfi -i "sine=frequency=220" -c:v libx264 -tune zerolatency -af "volume=1.0" -c:a aac -f flv rtmp://localhost/test.stream

The above command will send a 1080p test pattern with sine audio.

Tools

Play Video with Audio Bar

mpv --mute --demuxer-lavf-analyzeduration=30 --lavfi-complex='[aid1] asplit [t1] [ao] ; [t1] showvolume=w=1000:h=100 [t2] ; [vid1]  [t2]  overlay  [vo]' SOME_VIDEO_SOURCE

Remove --mute if you want to start the video with an audible audio.

ffprobe

ffprobe SOME_VIDEO_SOURCE

Test the resolution, length, codec, etc. of a video source.

Resources

Royalty-Free Music

• https://pixabay.com/music/ (do check the license of the file)