ffmpeg-based script to re-assemble coubs into webm that is - multiplies the video defined number of times, combines with audio, cuts and encodes to webm
pre-requirements for windows: mingw packages: 32base msysbase developer-tools powershell
for *nix replace the powershell with bc float-point calculation (or make default static)
Latest ".mp3" and ".mp4" are assumed, asks simple questions with defaults available check details in the comments of the script itself