From d7977096a724f6f13752221d701c0e3ca242340c Mon Sep 17 00:00:00 2001
From: Michael Campagnaro <mikecampo@protonmail.com>
Date: Wed, 2 Aug 2023 15:11:25 -0400
Subject: [PATCH] Add trim-audio and add-audio-to-video scripts

---
 dotfiles/bin/add-audio-to-video | 58 +++++++++++++++++++++++++++++++++
 dotfiles/bin/trim-audio         | 51 +++++++++++++++++++++++++++++
 dotfiles/bin/trim-video         |  5 +--
 dotfiles/bin/trim-video-fast    |  8 ++---
 4 files changed, 116 insertions(+), 6 deletions(-)
 create mode 100644 dotfiles/bin/add-audio-to-video
 create mode 100644 dotfiles/bin/trim-audio

diff --git a/dotfiles/bin/add-audio-to-video b/dotfiles/bin/add-audio-to-video
new file mode 100644
index 0000000..1c1b798
--- /dev/null
+++ b/dotfiles/bin/add-audio-to-video
@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+
+# Re-encodes the video with a new primary audio channel.
+
+if which tput >/dev/null 2>&1; then
+    ncolors=$(tput colors)
+fi
+if [ -t 1 ] && [ -n "$ncolors" ] && [ "$ncolors" -ge 8 ]; then
+    RED="$(tput setaf 1)"
+    GREEN="$(tput setaf 2)"
+    YELLOW="$(tput setaf 3)"
+    BLUE="$(tput setaf 4)"
+    MAGENTA="$(tput setaf 5)"
+    CYAN="$(tput setaf 6)"
+    BOLD="$(tput bold)"
+    NORMAL="$(tput sgr0)"
+else
+    RED=""
+    GREEN=""
+    YELLOW=""
+    BLUE=""
+    MAGENTA=""
+    CYAN=""
+    BOLD=""
+    NORMAL=""
+fi
+
+vid_filename=$(basename -- "$1")
+audio_filename=$(basename -- "$2")
+output_name="$3"
+
+if [[ $vid_filename == "" || $audio_filename == "" || $output_name == "" ]]; then
+    printf "${BOLD}${RED}Usage: add-audio-to-video <video filename> <audio filename> <output name>${NORMAL}\n"
+    exit 1
+fi
+
+vid_extension="${vid_filename##*.}"
+vid_filename="${vid_filename%.*}"
+
+audio_extension="${audio_filename##*.}"
+audio_filename="${audio_filename%.*}"
+
+output="${output_name}.$vid_extension"
+
+audio_encoding_opts="-c:a copy"
+if [[ $audio_extension == "wav" ]]; then
+    # Re-encode the audio.
+    audio_encoding_opts="-c:a aac -b:a 192k"
+fi
+
+printf "\n${YELLOW}${BOLD}Adding audio '$audio_filename.$audio_extension' to '$vid_filename.$vid_extension' | output: $output${NORMAL}\n"
+
+# -shortest handles the inputs not being the same duration. Conversion will stop when the shortest input's end is reached.
+# Alternatively you can loop with "-stream_loop -1"
+ffmpeg -y -stats -loglevel level+error -i "$vid_filename.$vid_extension" -i "$audio_filename.$audio_extension" -c:v copy -map 0:v:0 -map 1:a:0 $audio_encoding_opts -shortest "$output"
+
+printf "\n${GREEN}${BOLD}Finished adding audio${NORMAL}\n\n"
+
diff --git a/dotfiles/bin/trim-audio b/dotfiles/bin/trim-audio
new file mode 100644
index 0000000..f2de52d
--- /dev/null
+++ b/dotfiles/bin/trim-audio
@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+
+# Re-encodes the audio to get a more accurate seek time.
+
+if which tput >/dev/null 2>&1; then
+    ncolors=$(tput colors)
+fi
+if [ -t 1 ] && [ -n "$ncolors" ] && [ "$ncolors" -ge 8 ]; then
+    RED="$(tput setaf 1)"
+    GREEN="$(tput setaf 2)"
+    YELLOW="$(tput setaf 3)"
+    BLUE="$(tput setaf 4)"
+    MAGENTA="$(tput setaf 5)"
+    CYAN="$(tput setaf 6)"
+    BOLD="$(tput bold)"
+    NORMAL="$(tput sgr0)"
+else
+    RED=""
+    GREEN=""
+    YELLOW=""
+    BLUE=""
+    MAGENTA=""
+    CYAN=""
+    BOLD=""
+    NORMAL=""
+fi
+
+filename=$(basename -- "$1")
+output_name="$2"
+start_time="$3"
+end_time="$4"
+
+if [[ $filename == "" || $output_name == "" || $start_time == "" || $end_time == "" ]]; then
+    printf "${BOLD}${RED}Usage: trim-audio <filename> <output name> <start time HH:MM:SS> <end time HH:MM:SS>${NORMAL}\n"
+    exit 1
+fi
+
+extension="${filename##*.}"
+filename="${filename%.*}"
+output="${output_name}.$extension"
+timing_args="-ss $start_time -to $end_time"
+
+printf "\n${YELLOW}${BOLD}Trimming '$filename.$extension' | output: $output | start: $start_time | end: $end_time${NORMAL}\n"
+
+# You might have issues if the file has multiple video streams or embedded subtitles. The -map 0 arg is typically given
+# when copying a video stream, but I'm not sure if it's appropriate to use here.
+# Trying out async to keep video and audio synced.
+ffmpeg -y -stats -loglevel level+error $timing_args -accurate_seek -async 1 -i "$filename.$extension" -c copy "$output"
+
+printf "\n${GREEN}${BOLD}Finished trimming${NORMAL}\n\n"
+
diff --git a/dotfiles/bin/trim-video b/dotfiles/bin/trim-video
index f592c08..e82ed65 100644
--- a/dotfiles/bin/trim-video
+++ b/dotfiles/bin/trim-video
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# Re-encodes the video to get a more accurate timeline. If you want fast trimming at the expense of accuracy then use trim-video-fast.
+# Re-encodes the video to get a more accurate seek time. If you want fast trimming at the expense of accuracy then use trim-video-fast.
 
 if which tput >/dev/null 2>&1; then
     ncolors=$(tput colors)
@@ -44,7 +44,8 @@ printf "\n${YELLOW}${BOLD}Trimming '$filename.$extension' | output: $output | st
 
 # You might have issues if the file has multiple video streams or embedded subtitles. The -map 0 arg is typically given
 # when copying a video stream, but I'm not sure if it's appropriate to use here.
-ffmpeg -y -stats -loglevel level+error $timing_args -accurate_seek -i "$filename.$extension" -c:v libx264 -c:a copy "$output"
+# Trying out async to keep video and audio synced.
+ffmpeg -y -stats -loglevel level+error $timing_args -accurate_seek -async 1 -i "$filename.$extension" -c:v libx264 -c:a copy "$output"
 
 printf "\n${GREEN}${BOLD}Finished trimming${NORMAL}\n\n"
 
diff --git a/dotfiles/bin/trim-video-fast b/dotfiles/bin/trim-video-fast
index a2afea1..17b5e96 100644
--- a/dotfiles/bin/trim-video-fast
+++ b/dotfiles/bin/trim-video-fast
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 
-# A fast video trim that might result in some weird playback cursor timings,
-# e.g. video player might show negative seconds at the start of the vid or the
-# playback time might oscillate a bit. Use trim-video for accurate trimming at
-# the cost of a much slower processing time.
+# A fast video trim that might result in some weird seek timings, e.g. video
+# player might show negative seconds at the start of the vid or the playback
+# time might oscillate a bit. Use trim-video for accurate trimming at the cost
+# of a much slower processing time.
 
 if which tput >/dev/null 2>&1; then
     ncolors=$(tput colors)