CODEWITHSUNDEEP
javaffmpeg
xhassassin
xhassassin

Reputation: 283

ffmpeg doesn't run unless output is redirected in java

I'm currently running a ffmpeg process in java using:

Process ffmpeg = new ProcessBuilder("ffmpeg", ...).start();
ffmpeg.waitFor();

The issue is this process never terminates. However, if I do:

ProcessBuilder ffmpeg = new ProcessBuilder("ffmpeg", ...);
ffmpeg.redirectErrorStream(true).redirectOutput(ProcessBuilder.Redirect.INHERIT);
ffmpeg.start().waitFor();

The process runs fine.

Does anyone know why this might happen? It seems extremely weird that a process won't proceed unless I read its output.

Upvotes: 0

Views: 250

Answers (1)

Kayaman
Kayaman

Reputation: 73528

It's perfectly normal. There's a limited sized output buffer that needs to be read (or redirected to a bitbucket).

It's also one of the most common pitfalls when people start using ProcessBuilder and don't read the documentation first ;)

Upvotes: 5

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