[FFmpeg-user] getting 'av_interleaved_write_frame(): Operation not permitted with mp4 files

Patricia N Goldweic pgoldweic at northwestern.edu
Tue Jul 26 21:39:40 CEST 2011

Ok, thanks for getting back to me.

-----Original Message-----
From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-bounces at ffmpeg.org] On Behalf Of Ben Mesander
Sent: Thursday, July 21, 2011 1:26 PM
To: FFmpeg user questions and RTFMs
Subject: Re: [FFmpeg-user] getting 'av_interleaved_write_frame(): Operation not permitted with mp4 files

Hi Patricia,

> This would save ffmpeg users (especially inexperienced ones, like 
>myself)  tons of time (which would otherwise  be wasted trying to 
>figure out what on earth the error messages actually mean).
>If this feature hasn't been
> requested yet, and there is a way to request it you can point me to, 
>please let me know. Thanks,

ffmpeg gets an error code back from the operating system that it is running on, and that is what is being displayed.

It doesn't know if it's writing to a local filesystem, a network filesystem, a pipe, a fifo, or even what OS might be implementing the POSIX API that it is using.

In this regard, ffmpeg is no different than any other application for developed against the POSIX API.

Unfortunately this is confusing at times, if you are running on linux, you may want to look at /var/log/messages or similar when you get unexpected behavior from an application.

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