From 7218fb888592c44351779641bf3cacf83631d323 Mon Sep 17 00:00:00 2001
From: lhark <lhark@lharktop>
Date: Mon, 22 Nov 2021 22:16:02 +0100
Subject: [PATCH] More ffmpeg

---
 how_to | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/how_to b/how_to
index f644995..e268a52 100644
--- a/how_to
+++ b/how_to
@@ -383,8 +383,13 @@ Suckless sent:
         Hack
 
 Video and audio editing:
+    Inspect media file:
+        ffprobe in.mp{3,4}
     Cut video/audio:
         ffmpeg -ss "start" [-t "duration"|-to "end"] -i input.mp3 -acodec copy output.mp3
+    Extract audio from video:
+        # Lossless extract, use ffprobe to identify audio stream type
+        ffmpeg -i input-video.avi -vn -acodec copy output-audio.aac
     Remove audio from video file
         ffmpeg -i in.mp4 -an out.mp4
     Nvidia hardware encoding
@@ -719,6 +724,7 @@ Runit logging:
     runsv
         * if <service>/log exists, redirects service's stdout to logger's stdin
         * by default, runsv's stderr, stdout (and stdin?) are redirected to /dev/console
+
 Android:
     Uncompress android .ab backup files:
         # https://stackoverflow.com/questions/18533567/how-to-extract-or-unpack-an-ab-file-android-backup-file