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--- ubuntu:video:convert_h265_to_h264 [2020/02/23 13:56] – peter
+++ ubuntu:video:convert_h265_to_h264 [2023/06/13 10:56] (current) – removed peter
@@ Line 1: / Line 1: @@
-====== Ubuntu - Video - Convert H265 to H264 ======
-===== Matroska output =====
-<code bash>
-mkdir h264vids
-for f in *.mp4; do ffmpeg -i "$f" -map 0 -c copy -c:v libx264 -crf 23 -preset medium h264vids/"${f%.*}.mkv"; done
-</code>
-  * Will output to a directory named h264vids.
-  * Assumes your inputs are .mp4.  If not, change the .mp4 instance in the example to your input file type, or just use the greedy * by itself.
-  * Adjust -crf for quality and -preset for encoding speed/efficiency.  Or just remove these options and use the defaults which are fairly good and should suffice for most (the example is using the default values for these options).
-See [[https://trac.ffmpeg.org/wiki/Encode/H.264|FFmpeg Wiki: H.264]] for more info on these options.
-----
-===== MP4 output =====
-This example is a little more complicated.
-This will perform conditional encoding depending if the input audio is AAC or not.
-If the input audio is AAC then the audio will be stream copied (re-muxed) as is and needless re-encoding is avoided.
-If the input audio is not AAC then it will be re-encoded to AAC.
-<code bash>
-#!/bin/bash
-mkdir h264vids
-for f in *.mkv
-do
-  audioformat=$(ffprobe -loglevel error -select_streams a:0 -show_entries stream=codec_name -of default=nw=1:nk=1 "$f")
-  if [ "$audioformat" = "aac" ]; then
-    ffmpeg -i "$f" -c:v libx264 -crf 23 -preset medium -c:a copy -movflags +faststart h264vids/"${f%.*}.mp4"
-  else
-    ffmpeg -i "$f" -c:v libx264 -crf 23 -preset medium -c:a aac -movflags +faststart h264vids/"${f%.*}.mp4"
-  fi
-done
-</code>
-  * Will output to a directory named h264vids.
-  * Assumes your inputs are .mkv.  If not, change the .mkv instance in the example to your input file type, or just use the greedy * by itself.
-  * See note above regarding -crf and -preset.
-  * You can pause the encoding with ctrl+z and resume with fg.
-----
-<code bash>
-for file in *265.mkv; do nice -n19 ffmpeg -i $file -c copy -c:v libx264 ${file/%265.mkv/264.mkv}; done
-</code>
-  * Assumes that the files have always a name ending in 265.mkv.
-  * This ending will be replaced with 264.mkv.
-----