Module utils 

Functions

count_pngs_in_zip

Count PNG files inside a ZIP archive

extract_frame_from_zip

Extract a specific PNG frame from a ZIP archive

ffmpeg_base_args

Arguments every ffmpeg call starts with: no banner, and only warnings unless verbose_ffmpeg is set.

open_output

Open the rendered output in the default system viewer

run_ffmpeg_for_output

Like run_ffmpeg_with_output, but removes a half-written output file if ffmpeg fails.

run_ffmpeg_with_output

Run ffmpeg and return its stderr. On failure the error includes the last lines ffmpeg printed, which usually say what went wrong.

scan_ffmpeg_stderr

unzip_frames

Extracts frame_*.png from a ZIP into a temporary folder and returns the folder path along with the temp directory guard.