====== ffmpeg - Conversions - Convert H264 to AV1 - libaom - Average Bitrate (ABR) ======

**libaom-av1** offers a simple "Average Bitrate" or "Target Bitrate" mode.

  * In this mode, it will simply try to reach the specified bit rate on average, such as 2 MBit/s.

<WRAP info>
**NOTE:**  Use this option only if file size and encoding time are more important factors than quality alone.

  * Otherwise, use one of the other rate control methods.

</WRAP>

----

<code bash>
time ffmpeg -i a.mp4 -c:v libaom-av1 -b:v 2M -f mp4 out.mp4
</code>

returns:

<code bash>
...
real	106m2.063s
user	601m51.372s
sys	0m34.574s
</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>