## ffmpeg randomly freezes - vers. version N-82759-g1f5630a

Questions involving a Windows version of FFmpeg.
stib
Posts: 5
Joined: Wed Dec 03, 2014 7:49 am

### ffmpeg randomly freezes - vers. version N-82759-g1f5630a

In the last couple of versions I've been having an issue where ffmpeg will randomly freeze mid-encode. There is no crash or error message, it just stops encoding and never finishes. It does this at a random point in the encode, and it doesn't do it repeatably; if I kill one encode and then repeat the same command it will usually complete successfully. It also seems to happen regardless of the command I'm using. so it will happen if I do:

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ffmpeg -i input.avi output.mp4
and also using a different codec with a different input and output format:

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ffmpeg -i '.\alpha test.mov'  -c:v prores_ks -profile:v 4 -quant_mat 4 -pix_fmt yuva444p10le -alpha_bits 8 'prorestest.mov'
This is on Windows7 x64 with ffmpeg version N-82759-g1f5630a (updated 5/12/2016).

So in short it's the worst kind of bug: entirely non-repeatable. Has anyone else had this happen?

llogan
Posts: 332
Joined: Fri Mar 14, 2014 3:29 am

### Re: ffmpeg randomly freezes - vers. version N-82759-g1f5630a

Is it reproducible on multiple machines?

Degru
Posts: 2
Joined: Sat Dec 10, 2016 5:47 am

### Re: ffmpeg randomly freezes - vers. version N-82759-g1f5630a

Zeranoe
Posts: 705
Joined: Sat May 07, 2011 7:12 pm
Contact:

### Re: ffmpeg randomly freezes - vers. version N-82759-g1f5630a

To anyone experiencing this issue, please provide the full uncut command and command output.

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ffmpeg -loglevel verbose -i ...
You could open a bug report and post a stack trace.

Degru
Posts: 2
Joined: Sat Dec 10, 2016 5:47 am

### Re: ffmpeg randomly freezes - vers. version N-82759-g1f5630a

How do I go about putting this in a script? The issue is extremely intermittent, happening only 1 in 300 encodes or so. I need it to go into a file that gets overwritten every time until it freezes up, because it takes a LONG time to reproduce this.

Zeranoe