Lecture Speedrun. Prototype. Very experimental. Accessible here: https://zznidar.github.io/lecture-speedrun/
Inspired by carykh's Automatic on-the-fly video editing tool! and jumpcutter.
Prototype tested only in Firefox and Chrome. Firefox prior to v91 may not play any audio.
Lecture Speedrun allows you to speed up silent portions of a lecture video/audio on-the-fly, saving you precious time. Should it happen that your teacher speaks really slowly or makes a lot of pauses between sentences, use Lecture Speedrun to play the silent portions at a higher rate.
- Open https://zznidar.github.io/lecture-speedrun/ in Firefox or Chrome.
- Pick a video or audio file of the lecture you want to speedrun.
- Optionally adjust settings.
- Play the video.
Confirm your settings changes with the Confirm button.
How loud the audio should be at a given moment to be treated as speech. Observe Current loudness below to fine-tune it. If silence is treated as speech, increase the threshold. If speech is treated as silence, lower the threshold.
How many consequent analyses should be silent to count it as silence. The higher this number, the longer it will take after the lecturer stops speaking to start fast-forwarding.
Playback speed when the lecturer is silent.
Playback speed when the lecturer is speaking.
Experimental feature to seek the video back for a split-second once the lecturer starts speaking. Would be useful if the first sounds of speech were cut off. Doesn't work too well 😅
Increase the playback loudness. Useful if the video volume is very low. Note that this does not affect the analysis.
Current loudness is shown at every given moment to make it easier for you to adjust the Loudness threshold. However, some users reported it uses a lot of their CPU. Check this box to stop updating current loudness indicator.
This icon indicates when the video is fast-forwarded: ⏩︎ Check this box to stop indicating the state of speed.
- Make sure not to use the lefting functionality. It really does more harm than good.
- Some users report better performance if they disable Hardware-accelerated video decode and Hardware-accelerated video encode under chrome://flags
- Firefox limits playback speed to 4x.
Binge-watching your lectures at 2x playback speed on your sofa with a glass of beer and a bowl of popcorn in your hands during the last 2 weeks before your exams might not be the best idea.