Comment 8 for bug 1086075

In the cache directory for a given movie (e.g. cache/movies/.../abc123) there should be a log generated with the command used by FFmpeg. Are those logs there?

If so, what I would try is editing api/src/Movie/HelioviewerMovie.php and temporarily comment out the lines which are responsible for deleting the movie frame after the videos have been generated:

340- // Clean up movie frame images that are no longer needed
341- if (file_exists($dir)) {
342- foreach (glob("$dir*") as $image) {
343: unlink($image);
344- }
345- rmdir($dir);

Then go back and try running the FFmpeg command from the log manually and see if it works.