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--- ffmpeg:conversions:convert_h264_to_h265 [2023/06/13 10:46] – created peter
+++ ffmpeg:conversions:convert_h264_to_h265 [2023/11/01 21:23] (current) – peter
@@ Line 1: / Line 1: @@
 ====== 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