how to make a queue in php with mysql

Question

hy,

in my script i run a exec() function to make a movie file with ffmpeg.

the problem is ffmpeg can run only 1 time on the server,

if 2 people are online on server and first one already run ffmpeg i want the second to wait until the first end the process

how to code this?

thank you

Answer 1

Set a lock somewhere.

When ffmpeg starts, set a flag in a file or a database table to mark it as in progress. Every time ffmpeg starts, have it check if the flag value is '1', and if so, wait and retry in 5 or 10 seconds. Then when the process ends, set the flag to '0'. Make sure if it crashes or your script has an error that the flag is set back to '0'.

Or, you could likely run the ffmpeg process as a different user, and have more than one running at once.