[FFmpeg-user] Audio converting and muxing error/warning messages

Carl Eugen Hoyos ceffmpeg at gmail.com
Mon Dec 17 16:10:10 EET 2018

2018-12-17 10:04 GMT+01:00, Felix Muster <felixjan.muster at icloud.com>:

> I need to convert different audio streams with ffmpeg (v4.0.3-win64).
> But there are several error/warning messages I need to handle.
> Here are some example code snippets:

Code snippets unfortunately are not helpful, if you need support
here, please test current FFmpeg git head and provide the
command line you tested together with its complete, uncut
console output here on the mailing list.


> [ac3 @ 0000000000502b40] Estimating duration from bitrate, this may be
> inaccurate
> Only pops up when I'm trying to convert the following lossy formats: ac3,
> dts and eac3.

These have bitrates, variable bitrate is unusual for them but theoretically
possible. (The warning is correct.)

> With lossy dts (as DTS-HD High Resolution) I'm fine.

This has no bitrate and therefore no duration can be estimated.

Carl Eugen

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