whisper.cpp/examples/livestream.sh

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#!/bin/bash
set -eo pipefail
# Transcribe audio livestream by feeding ffmpeg output to whisper.cpp at regular intervals
# Idea by @semiformal-net
# ref: https://github.com/ggerganov/whisper.cpp/issues/185
#
# TODO:
# - Currently, there is a gap between sequential chunks, so some of the words are dropped. Need to figure out a
# way to produce a continuous stream of audio chunks.
#
url="http://a.files.bbci.co.uk/media/live/manifesto/audio/simulcast/hls/nonuk/sbr_low/ak/bbc_world_service.m3u8"
fmt=aac # the audio format extension of the stream (TODO: auto detect)
step_s=30
model="base.en"
if [ -z "$1" ]; then
echo "Usage: $0 stream_url [step_s] [model]"
echo ""
echo " Example:"
echo " $0 $url $step_s $model"
echo ""
echo "No url specified, using default: $url"
else
url="$1"
fi
if [ -n "$2" ]; then
step_s="$2"
fi
if [ -n "$3" ]; then
model="$3"
fi
# Whisper models
models=( "tiny.en" "tiny" "base.en" "base" "small.en" "small" "medium.en" "medium" "large" )
# list available models
function list_models {
printf "\n"
printf " Available models:"
for model in "${models[@]}"; do
printf " $model"
done
printf "\n\n"
}
if [[ ! " ${models[@]} " =~ " ${model} " ]]; then
printf "Invalid model: $model\n"
list_models
exit 1
fi
running=1
#trap "running=0" SIGINT SIGTERM
printf "[+] Transcribing stream with model '$model', step_s $step_s (press Ctrl+C to stop):\n\n"
# continuous stream in native fmt (this file will grow forever!)
ffmpeg -loglevel quiet -y -re -probesize 32 -i $url -c copy /tmp/whisper-live0.${fmt} &
if [ $? -ne 0 ]; then
printf "Error: ffmpeg failed to capture audio stream\n"
exit 1
fi
printf "Buffering audio. Please wait...\n"
# For some reason, the initial buffer can end up smaller than step_s (even though we sleep for step_s)
sleep $(($step_s*2))
i=0
while [ $running -eq 1 ]; do
# a handy bash built-in, SECONDS,
# > "This variable expands to the number of seconds since the shell was started. Assignment to this variable resets the count to the value assigned, and the expanded value becomes the value assigned
# > plus the number of seconds since the assignment."
SECONDS=0
# 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 (??)
if [ $i -gt 0 ]; then
ffmpeg -loglevel quiet -noaccurate_seek -i /tmp/whisper-live0.${fmt} -y -ar 16000 -ac 1 -c:a pcm_s16le -ss $(($i*$step_s-1)).5 -t $step_s /tmp/whisper-live.wav
else
ffmpeg -loglevel quiet -noaccurate_seek -i /tmp/whisper-live0.${fmt} -y -ar 16000 -ac 1 -c:a pcm_s16le -ss $(($i*$step_s)) -t $step_s /tmp/whisper-live.wav
fi
./main -t 8 -m ./models/ggml-base.en.bin -f /tmp/whisper-live.wav --no-timestamps -otxt 2> /tmp/whispererr | tail -n 1
echo
while [ $SECONDS -lt $step_s ]; do
sleep 1
done
((i=i+1))
done