72 lines
2.2 KiB
Bash
72 lines
2.2 KiB
Bash
#!/usr/bin/env bash
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# Transcodes audio from a video or audio source into a new audio file. If you
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# just want the audio from a video as-is then use extract-audio-from-video
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if which tput >/dev/null 2>&1; then
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ncolors=$(tput colors)
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fi
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if [ -t 1 ] && [ -n "$ncolors" ] && [ "$ncolors" -ge 8 ]; then
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RED="$(tput setaf 1)"
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GREEN="$(tput setaf 2)"
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YELLOW="$(tput setaf 3)"
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BLUE="$(tput setaf 4)"
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MAGENTA="$(tput setaf 5)"
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CYAN="$(tput setaf 6)"
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BOLD="$(tput bold)"
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NORMAL="$(tput sgr0)"
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else
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RED=""
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GREEN=""
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YELLOW=""
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BLUE=""
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MAGENTA=""
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CYAN=""
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BOLD=""
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NORMAL=""
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fi
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filename="$1"
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output_name="$2"
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sample_rate="$3"
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channel_count="$4"
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start_time="$5"
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end_time="$6"
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output_base=$(basename -- "$output_name")
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output_extension="${output_base##*.}"
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if [[ $filename == "" || $output_extension == "" || $output_extension == $output_base ]]; then
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printf "${BOLD}${RED}Usage: transcode-audio <filename> <output name w/ extension> <optional: sample rate. Defaults to 44100> <optional: channel count. Defaults to 2> <optional: start time HH:MM:SS, use empty string or 0 for start> <optional: end time HH:MM:SS, use empty string or 0 for no value>${NORMAL}\n"
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exit 1
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fi
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if [[ $sample_rate == "" ]]; then
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sample_rate="44100"
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fi
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if [[ $channel_count == "" ]]; then
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channel_count="2"
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fi
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timing_args=""
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if [[ $start_time != "" ]]; then
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timing_args="-ss $start_time "
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fi
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if [[ $end_time != "" ]]; then
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if [[ $start_time == "0" && $end_time == "0" ]]; then
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# We treat a start and end with 0 values as no op.
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timing_args=""
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elif [[ $end_time != "0" ]]; then
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# Handle having a start time but end time is set to 0, can just ignore it and it'll use the remainder of the video.
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timing_args+="-to $end_time"
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fi
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fi
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printf "\n${YELLOW}${BOLD}Extracting audio from '$filename' | output: '$output_name' | sample rate: $sample_rate | channels: $channel_count | start: $start_time | end: $end_time${NORMAL}\n"
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ffmpeg -y -stats -loglevel level+error $timing_args -accurate_seek -i "$filename" -ar $sample_rate -ac $channel_count -map a "$output_name"
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printf "\n${GREEN}${BOLD}Done extracting audio from '$filename' | output '$output_name'${NORMAL}\n\n"
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