[FFmpeg-user] command line syntax ambiguity, was: What is option -level ?

Ulf Zibis Ulf.Zibis at gmx.de
Fri Feb 15 10:41:22 EET 2019

Hi Carl Eugen,

Am 15.02.19 um 01:06 schrieb Carl Eugen Hoyos:
> "+" means that the flag should be set (no effect for flags that are set
> by default or by the application) , "-" that the flag should be removed
> (no effect if the flag is not set by default or by the application)
>> There is no explanation on this at:
>> https://www.ffmpeg.org/ffmpeg-codecs.html#Codec-Options
>> True.

Thanks! I filed a bug: https://trac.ffmpeg.org/ticket/7738

>> - How to determine, if global codec options (e.g. "-level") are valid
>> for audio, video or both.
> You cannot because it is codec-specific (so if you know the codec
> you are using, you know if it - or its implementation - supports levels).

But if I use a audio and video codec which both support the same codec
option e.g. "-level" and one wants "-level 30" for the video codec, but
no change or another value e.g. 5 for the audio codec, which syntax
should one use?


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