#!/bin/bash

# This script record two video streams using gstreamer and saves them to files
# The first video stream is the reference and the second is the encoded stream to be tested
# First stream is coming from decklinkvideosrc
# Second stream is same decklinkvideosrc but encoded using x264enc
# Both streams are saved to files using mp4mux and filesink

if [ "$#" -lt 2 ]; then
    echo "Usage: $0 <reference_video_file> <test_video_file> <optional: DEBUG>"
    exit 1
fi

if ! command -v gst-launch-1.0 &> /dev/null
then
    echo "gstreamer could not be found, please install it."
    exit 1
fi

# Record both streams in one run
if [ "$3" == "DEBUG" ]; then
    gst-launch-1.0 -e \
        videotestsrc pattern=smpte ! \
        capsfilter caps="video/x-raw,format=UYVY,width=1920,height=1080,framerate=30/1" ! \
        videoconvert ! queue ! tee name=t \
        t. ! queue ! filesink location="$1" \
        t. ! queue ! x264enc bitrate=20000 speed-preset=ultrafast tune=zerolatency ! h264parse ! mpegtsmux ! filesink location="$2"
    exit 0
fi

gst-launch-1.0 -e \
  decklinkvideosrc \
    device-number=1 \
    connection=1 \
    mode=auto \
    drop-no-signal-frames=true ! videoconvert ! queue ! tee name=t \
    t. ! queue ! mpegtsmux ! filesink location="$1" \
    t. ! queue ! x264enc bitrate=20000 speed-preset=ultrafast tune=zerolatency ! mpegtsmux ! filesink location="$2"