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====== ffmpeg - Conversions - Convert H264 to H265 ======

===== Convert h.264 to h.265 (no change in resolution) =====

<code bash>
ffmpeg -i input.mp4 -c:v libx265 -vtag hvc1 -c:a copy output.mp4
</code>

----

===== Software Encoding =====

<code bash>
ffmpeg -i a.mp4 -c:v libx265 a.mkv

ffmpeg -i a.mp4 -c:v libx265 -map 0:v -c:a copy -map 0:a -c:s copy b.mkv

ffmpeg -i a.mp4 -c:v libx265 -map 0:v -c:a copy -map 0:a? -c:s copy -map 0:s? b.mkv
</code>

<WRAP info>
**NOTE:**  **libx265** is a software encoder.

  * It does not support hardware encoding.

</WRAP>

----

===== Using GPU Hardware Encoding =====

<code bash>
ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i a.mp4 -c:v hevc_vaapi a.mkv

ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i a.mp4 -c:v hevc_vaapi -map 0:v -c:a copy -map 0:a -c:s copy a.mkv

ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i a.mp4 -c:v hevc_vaapi -map 0:v -c:a copy -map 0:a? -c:s copy -map 0:s? a.mkv
</code>

<WRAP info>
**NOTE:**  This allows the GPU to be used:

<code bash>
-hwaccel vaapi -hwaccel_output_format vaapi -vaapi_device /dev/dri/renderD128
</code>

----

==== Encoding formats ====

Try replacing scale with scale_vaapi and replace -c:v h264 with -c:v: h264_vaapi

The supported encoders are:
|H.262 / MPEG-2 part 2|mpeg2_vaapi|
|H.264 / MPEG-4 part 10 (AVC)|h264_vaapi|
|H.265 / MPEG-H part 2 (HEVC)|hevc_vaapi|
|MJPEG / JPEG|mjpeg_vaapi|
|VP8|vp8_vaapi|
|VP9|vp9_vaapi|

</WRAP>

----

===== Keeping the output size low, similar to Software encoding =====


<code bash>
ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i input.mp4 -c:v hevc_vaapi -b:v 0.589M output.mp4
</code>

<WRAP info>
**NOTE:**  I had to set the bitrate smaller because the transcoded one was even bigger than the original file.

  * You can change bitrate at 0.589M
    * 0.589M is 0.589 Megabytes.
  * Change it accordingly to your desired bitrate. I will use 2x - 3x smaller than the orginal. In this example h.264 to hevc.


</WRAP>

----

==== Other examples ====

<code bash>
ffmpeg -i a.mp4 -vaapi_device /dev/dri/renderD128 -vf format=nv12,hwupload -c:v hevc_vaapi -map 0:v:0 -map 0:a? -c:a copy -map 0:s? -c:s copy -rc_mode 1 -qp 25 -map_chapters 0 b.mkv

ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i a.mp4 -c:v hevc_vaapi -map 0:v:0 -map 0:a? -c:a copy -map 0:s? -c:s copy -b:a 320k -global_quality 25 k.mkv

ffmpeg -init_hw_device vaapi=amd:/dev/dri/renderD128 -hwaccel vaapi -hwaccel_output_format vaapi -hwaccel_device amd -filter_hw_device amd -i a.mp4 -vf 'format=nv12|vaapi,hwupload' -y -c:v hevc_vaapi -map 0:v:0 -map 0:a? -c:a copy -map 0:s? -c:s copy -qp:v 28 b.mkv


ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i a.mp4 -c:v hevc_vaapi b.mkv

ffmpeg -threads 16 -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i a.mp4 -c:v hevc_vaapi c.mkv
</code>

----

=== References ===

https://trac.ffmpeg.org/wiki/Encode/H.265