Bash AWS Lambda runtime for converting raw h264 to mkv

function.sh

#!/bin/bash

# Env to help ffmpeg to convert the raw stream to desirable framerate
FRAMERATE=${FRAMERATE:-15}
# Env to route converted video to new base prefix
CONVERSION_PATH=${CONVERSION_PATH:-motion_videos_converted}
# Env param to control which output you want.. ie 'mp4' for browser baseed video
CONVERSION_FORMAT=${CONVERSION_FORMAT:-mkv}

function handler () {
  EVENT_DATA=$1
  echo "Event data: $EVENT_DATA"
  VIDEO_URLS=$(echo "$EVENT_DATA" | jq '.Records[].s3 | "s3://" + .bucket.name + "/" + .object.key' | tr -d '"')

  for video_object in $VIDEO_URLS; do
    CAMERA_NAME=$(basename "$(dirname $video_object)")
    VIDEO_FILE=$(basename $video_object)
    mkdir -p $CAMERA_NAME
    aws s3 cp $video_object $CAMERA_NAME
    NEW_VIDEO_FILE="${VIDEO_FILE%.*}.${CONVERSION_FORMAT}"
    NEW_PATH="${CAMERA_NAME}/${NEW_VIDEO_FILE}"
    # Fast copy with '-c' ... no need for a deep conversation
    ffmpeg -r $FRAMERATE -i "$CAMERA_NAME/$VIDEO_FILE" -c copy "$NEW_PATH"
    BUCKET_NAME=$(echo "$video_object" | sed -E 's|^s3://([^/]+)/.+|\1|')
    aws s3 cp "$NEW_PATH" s3://$BUCKET_NAME/$CONVERSION_PATH/$NEW_PATH
    # clean up working area... we don't want to step on other Lambda containers
    rm -f $NEW_PATH
  done

  echo "Finished converting videos"
}