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113 lines
2.9 KiB
113 lines
2.9 KiB
#!/bin/bash
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#
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# Transcribe audio livestream by feeding ffmpeg output to whisper.cpp at regular intervals
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# Idea by @semiformal-net
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# ref: https://github.com/ggerganov/whisper.cpp/issues/185
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#
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set -eo pipefail
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url="http://a.files.bbci.co.uk/media/live/manifesto/audio/simulcast/hls/nonuk/sbr_low/ak/bbc_world_service.m3u8"
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fmt=aac # the audio format extension of the stream (TODO: auto detect)
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step_s=30
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model="base.en"
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check_requirements()
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{
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if ! command -v ./main &>/dev/null; then
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echo "whisper.cpp main executable is required (make)"
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exit 1
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fi
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if ! command -v ffmpeg &>/dev/null; then
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echo "ffmpeg is required (https://ffmpeg.org)"
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exit 1
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fi
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}
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check_requirements
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if [ -z "$1" ]; then
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echo "Usage: $0 stream_url [step_s] [model]"
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echo ""
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echo " Example:"
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echo " $0 $url $step_s $model"
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echo ""
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echo "No url specified, using default: $url"
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else
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url="$1"
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fi
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if [ -n "$2" ]; then
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step_s="$2"
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fi
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if [ -n "$3" ]; then
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model="$3"
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fi
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# Whisper models
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models=( "tiny.en" "tiny" "base.en" "base" "small.en" "small" "medium.en" "medium" "large-v1" "large" )
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# list available models
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function list_models {
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printf "\n"
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printf " Available models:"
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for model in "${models[@]}"; do
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printf " $model"
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done
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printf "\n\n"
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}
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if [[ ! " ${models[@]} " =~ " ${model} " ]]; then
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printf "Invalid model: $model\n"
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list_models
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exit 1
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fi
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running=1
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trap "running=0" SIGINT SIGTERM
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printf "[+] Transcribing stream with model '$model', step_s $step_s (press Ctrl+C to stop):\n\n"
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# continuous stream in native fmt (this file will grow forever!)
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ffmpeg -loglevel quiet -y -re -probesize 32 -i $url -c copy /tmp/whisper-live0.${fmt} &
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if [ $? -ne 0 ]; then
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printf "Error: ffmpeg failed to capture audio stream\n"
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exit 1
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fi
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printf "Buffering audio. Please wait...\n\n"
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sleep $(($step_s))
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# do not stop script on error
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set +e
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i=0
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SECONDS=0
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while [ $running -eq 1 ]; do
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# extract the next piece from the main file above and transcode to wav. -ss sets start time and nudges it by -0.5s to catch missing words (??)
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err=1
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while [ $err -ne 0 ]; do
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if [ $i -gt 0 ]; then
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ffmpeg -loglevel quiet -v error -noaccurate_seek -i /tmp/whisper-live0.${fmt} -y -ar 16000 -ac 1 -c:a pcm_s16le -ss $(($i*$step_s-1)).5 -t $step_s /tmp/whisper-live.wav 2> /tmp/whisper-live.err
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else
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ffmpeg -loglevel quiet -v error -noaccurate_seek -i /tmp/whisper-live0.${fmt} -y -ar 16000 -ac 1 -c:a pcm_s16le -ss $(($i*$step_s)) -t $step_s /tmp/whisper-live.wav 2> /tmp/whisper-live.err
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fi
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err=$(cat /tmp/whisper-live.err | wc -l)
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done
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./main -t 8 -m ./models/ggml-${model}.bin -f /tmp/whisper-live.wav --no-timestamps -otxt 2> /tmp/whispererr | tail -n 1
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while [ $SECONDS -lt $((($i+1)*$step_s)) ]; do
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sleep 1
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done
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((i=i+1))
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done
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killall -v ffmpeg
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killall -v main
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