====== ffmpeg - Conversions - Convert H264 to AV1 - libaom - A minimum and maximum bitrate ======

**libaom-av1** allows a minimum and maximum bitrate can be specified, instead of a quality target.

  * This method is useful for bulk encoding videos in a generally consistent fashion. 

<WRAP info>
**NOTE:**  When muxing into MP4, you may want to add **-movflags +faststart** to the output parameters if the intended use for the resulting file is streaming.
</WRAP>

----

<code bash>
time ffmpeg -i a.mp4 -c:v libaom-av1 -minrate 500k -b:v 2000k -maxrate 2500k -f mp4 out.mp4
</code>

returns:

<code bash>
...
real	107m58.989s
user	618m30.322s
sys	0m32.327s
</code>

<WRAP info>
**NOTE:** 

  * Input test size:  75.5M
  * Output test size:  4.9M

</WRAP>


<WRAP info>
**NOTE:**  The bitrate limit by the **-b:v** where the bitrate MUST be non-zero.
</WRAP>