Each time a key is pressed the time (since the start of the presentation) is recorded, as well as the slide number. Using the script, pressing the f key moves forward a slide, and b back.

the time spent on each slide) by using a Bash shell script to move between slides in the presentation. I record the timing of the presentation (i.e. vcodec libx264 -vpre lossless_ultrafast -threads 0 screen.m4v

This means what is displayed on the projector (and what I want to record) is offset of 1024x0 pixels (since my laptop screen has a width of 1024 pixels). On my laptop screen resolution, which is 1024圆00, I display a clock and other stuff for myself. With my laptop during a lecture I extend my desktop to the second video output (i.e. The screencast is recorded using ffmpeg, producing a MPEG (H.264) file with 1024x768 frames, 2 frames per second. First, the audio is recording using sox, producing a FLAC file using mono, 44100Hz and 16-bit encoding. I have a single script that records the audio, screencast and timing. This year I've simplified the recording of the audio and slide timing, as well as recorded a screencast. However, I never finished the code for the web-based slideshow (although I've now made videos of the lectures using dvd-slideshow). I also used a simple script to record the timing of each slide, with the intention of using it to created an audio slideshow on the website allowing students to replay the lecture. Then I would save the entire recording in FLAC format, as well as make a 32kb/s MP3 available for students on my course website. The procedure was quite easy: connect the Record Output of the lecture room amplifier into my laptop and record using Audacity. Recording Lectures on Ubuntu using ffmpeg, sox and xdotoolįor the 3 lecture courses I taught at SIIT in 2010 I recorded the audio of each lecture.

Using ffmpeg ubuntu