Tools for lecture recording
This project is maintained by hkawash
The bitrate of audio files recorded with PowerPoint seems too large for “speech”. This tool tries to shrink the file size of pptx/ppsx files by making lower the bitrate of internal audio data (e.g., inserted by Insert > Audio > Record Audio).
lecrec-tools
), a subfolder ppt-in
, and download the following script to the main folder (use right-click > Save Link As…).
If you already have ffmpeg installed, you can skip step 2 and 3. If have not set the environment variable (path) for ffmpeg yet, you can edit the script (the line with PATH
) or simply follow step 3 (copy the ffmpeg executable file).
ppt-in
folder. (Backup the files, just in case.)compress_pptaudio-win.bat
compress_pptaudio-mac.sh
from terminalppt-out
folder. $ cd /Users/<user name>/Documents/lecrec-tools-master
(Press return
after you typed. <user name>
should be replaced by your user name of the PC.)
$ chmod 755 compress_pptaudio-mac.sh
$ ./compress_pptaudio-mac.sh
(chmod
is required only once after the download)
BITRATE
inside the script.m4a
inside the script.