diff --git a/auto-boost_2.5.py b/auto-boost_2.5.py
new file mode 100755
index 0000000..a4cc499
--- /dev/null
+++ b/auto-boost_2.5.py
@@ -0,0 +1,484 @@
+#Originally by Trix
+#Contributors: R1chterScale, Yiss and Kosaka
+
+from math import ceil
+import json
+import os
+import subprocess
+import re
+import argparse
+import psutil
+import shutil
+import vapoursynth as vs
+core = vs.core
+core.max_cache_size = 1024
+
+if shutil.which("av1an") is None:
+    raise FileNotFoundError("av1an not found, exiting")
+
+if shutil.which("turbo-metrics") is None:
+    print("turbo-metrics not found, defaulting to vs-zip")
+    ssimu2zig = True
+    default_skip = 3
+else:
+    ssimu2zig = False
+    default_skip = 0
+
+parser = argparse.ArgumentParser()
+parser.add_argument("-s", "--stage", help = "Select stage: 1 = encode, 2 = calculate metrics, 3 = generate zones | Default: all", default=0)
+parser.add_argument("-i", "--input", required=True, help = "Video input filepath (original source file)")
+parser.add_argument("-q", "--quality", help = "Base quality (CRF) | Default: 30", default=30)
+parser.add_argument("-d", "--deviation", help = "Maximum CRF change from original | Default: 10", default=10)
+parser.add_argument("-p", "--preset", help = "Fast encode preset | Default: 9", default=9)
+parser.add_argument("-w", "--workers", help = "Number of av1an workers | Default: amount of physical cores", default=psutil.cpu_count(logical=False))
+parser.add_argument("-m", "--metrics", help = "Select metrics: 1 = SSIMU2, 2 = XPSNR, 3 = Both | Default: 1", default=1)
+parser.add_argument("-S", "--skip", help = "SSIMU2 skip value, every nth frame's SSIMU2 is calculated | Default: 0 for turbo-metrics, 3 for vs-zip")
+parser.add_argument("-z", "--zones", help = "Zones calculation method: 1 = SSIMU2, 2 = XPSNR, 3 = Multiplication, 4 = Lowest Result | Default: 1", default=1)
+parser.add_argument("-a", "--aggressive", action='store_true', help = "More aggressive boosting | Default: not active")
+args = parser.parse_args()
+stage = int(args.stage)
+src_file = args.input
+output_dir = os.path.dirname(src_file)
+tmp_dir = os.path.join(output_dir, "temp")
+output_file = os.path.join(output_dir, f"{os.path.splitext(os.path.basename(src_file))[0]}_fastpass.mkv")
+scenes_file = os.path.join(tmp_dir, "scenes.json")
+br = float(args.deviation)
+skip = args.skip if args.skip is not None else default_skip
+aggressive = args.aggressive
+
+def get_ranges(scenes: str) -> list[int]:
+    """
+    Reads a scene file and returns a list of frame numbers for each scene change.
+
+    :param scenes: path to scene file
+    :type scenes: str
+
+    :return: list of frame numbers
+    :rtype: list[int]
+    """
+    ranges = [0]
+    with open(scenes, "r") as file:
+        content = json.load(file)
+        for scene in content['scenes']:
+            ranges.append(scene['end_frame'])
+    return ranges
+
+def fast_pass(
+        input_file: str, output_file: str, tmp_dir: str, preset: int, crf: float, workers: int
+):
+    """
+    Quick fast-pass using Av1an
+
+    :param input_file: path to input file
+    :type input_file: str
+    :param output_file: path to output file
+    :type output_file: str
+    :param tmp_dir: path to temporary directory
+    :type tmp_dir: str
+    :param preset: encoder preset
+    :type preset: int
+    :param crf: target CRF
+    :type crf: float
+    :param workers: number of workers
+    :type workers: int
+    """
+
+    fast_av1an_command = [
+        'av1an',
+        '-i', input_file,
+        '--temp', tmp_dir,
+        '-y',
+        '--verbose',
+        '--keep',
+        '-m', 'lsmash',
+        '-c', 'mkvmerge',
+        '--min-scene-len', '24',
+        '--sc-downscale-height', '720',
+        '--set-thread-affinity', '2',
+        '-e', 'svt-av1',
+        '--force',
+        '-v', f'"--preset {preset} --crf {crf:.2f} --lp 2 --scm 0 --keyint 0 --fast-decode 1 --color-primaries 1 --transfer-characteristics 1 --matrix-coefficients 1"',
+        '-w', str(workers),
+        '-o', output_file
+    ]
+
+    process = subprocess.run(' '.join(fast_av1an_command), shell=True, check=True)
+    
+    if process.returncode != 0:
+        print(f"Av1an exited with code: {process.returncode}")
+        exit(1)
+
+def turbo_metrics(
+    source: str, distorted: str, every: int
+) -> subprocess.CompletedProcess:
+    """
+    Compare two files with SSIMULACRA2 using turbo-metrics.
+
+    :param source: path to source file
+    :type source: str
+    :param distorted: path to distorted file
+    :type distorted: str
+    :param every: compare every X frames
+    :type every: int
+
+    :return: completed process
+    :rtype: subprocess.CompletedProcess
+    """
+
+    turbo_cmd = [
+        "turbo-metrics",
+        "-m",
+        "ssimulacra2",
+        "--output",
+        "csv",
+    ]
+
+    if every > 1:
+        turbo_cmd.append("--every")
+        turbo_cmd.append(str(every))
+
+    turbo_cmd.append(source)
+    turbo_cmd.append(distorted)
+
+    return subprocess.run(
+        turbo_cmd,
+        capture_output=True,
+        text=True,
+    )
+
+def calculate_ssimu2(src_file, enc_file, ssimu2_txt_path, ranges, skip):
+    if ssimu2zig:
+        source_clip = core.lsmas.LWLibavSource(source=src_file, cache=0)
+        encoded_clip = core.lsmas.LWLibavSource(source=enc_file, cache=0)
+
+        #source_clip = source_clip.resize.Bicubic(format=vs.RGBS, matrix_in_s='709').fmtc.transfer(transs="srgb", transd="linear", bits=32)
+        #encoded_clip = encoded_clip.resize.Bicubic(format=vs.RGBS, matrix_in_s='709').fmtc.transfer(transs="srgb", transd="linear", bits=32)
+
+        print(f"source: {len(source_clip)} frames")
+        print(f"encode: {len(encoded_clip)} frames")
+
+        with open(ssimu2_txt_path, "w") as file:
+            file.write(f"skip: {skip}\n")
+
+        iter = 0
+        for i in range(len(ranges) - 1):
+            cut_source_clip = source_clip[ranges[i]:ranges[i+1]].std.SelectEvery(cycle=skip, offsets=1)
+            cut_encoded_clip = encoded_clip[ranges[i]:ranges[i+1]].std.SelectEvery(cycle=skip, offsets=1)
+            result = core.vszip.Metrics(cut_source_clip, cut_encoded_clip, mode=0)
+
+            for index, frame in enumerate(result.frames()):
+                iter += 1
+                score = frame.props['_SSIMULACRA2']
+                with open(ssimu2_txt_path, "a") as file:
+                    file.write(f"{iter}: {score}\n")
+    else:
+        turbo_metrics_run = turbo_metrics(src_file, enc_file, skip)
+
+        if turbo_metrics_run.returncode != 0:
+            print(f"Turbo Metrics exited with code: {turbo_metrics_run.returncode}")
+            print(turbo_metrics_run.stdout)
+            print(turbo_metrics_run.stderr)
+            exit(1)
+
+        with open(ssimu2_txt_path, "w") as file:
+            file.write(f"skip: {skip}\n")
+
+        frame = 0
+        # for whatever reason, turbo-metrics in csv mode dumps the entire scores to stdout at the end even though it prints them live to stdout.
+        # so we need to see if we've seen ``ssimulacra2`` before and if we have, ignore anything after the second one.
+        ignore_end_barf = False
+        for line in turbo_metrics_run.stdout.splitlines():
+            # set ignore_end_barf to true as this is the first "ssimulacra2" line
+            if line == "ssimulacra2" and not ignore_end_barf:
+                ignore_end_barf = True
+            # break the loop as we've encountered the second "ssimulacra2" line so we don't get a dupe of the scores.
+            elif line == "ssimulacra2" and ignore_end_barf:
+                break
+            # assume everything not "ssimulacra2" is a score.
+            if line != "ssimulacra2":
+                frame += 1
+                with open(ssimu2_txt_path, "a") as file:
+                    file.write(f"{frame}: {float(line)}\n")
+
+def calculate_xpsnr(src_file, enc_path, xpsnr_txt_path):
+    xpsnr_command = f'ffmpeg -i {src_file} -i {enc_path} -lavfi xpsnr="stats_file={xpsnr_txt_path}" -f null /dev/null'
+    p = subprocess.Popen(xpsnr_command, shell=True)
+    exit_code = p.wait()
+
+    if exit_code != 0:
+        print("XPSNR encountered an error, exiting.")
+        exit(-2)
+
+def get_xpsnr(xpsnr_txt_path):
+    count=0
+
+    sum_weighted = 0
+    values_weighted: list[int] = []
+
+    with open(xpsnr_txt_path, "r") as file:
+        for line in file:
+            match = re.search(r"XPSNR Y: ([0-9]+\.[0-9]+)  XPSNR U: ([0-9]+\.[0-9]+)  XPSNR : ([0-9]+\.[0-9]+)", line)
+            if match:
+                Y = float(match.group(1))
+                U = float(match.group(2))
+                V = float(match.group(3))
+                W = (4 * Y + U + V) / 6
+
+                sum_weighted += W
+                values_weighted.append(W)
+
+                count += 1
+            else:
+                print(line)
+        avg_weighted = sum_weighted / count
+        for i in range(len(values_weighted)):
+            values_weighted[i] /= avg_weighted
+    return values_weighted
+
+def get_ssimu2(ssimu2_txt_path):
+    ssimu2_scores: list[int] = []
+
+    with open(ssimu2_txt_path, "r") as file:
+        skipmatch = re.search(r"skip: ([0-9]+)", file.readline())
+        if skipmatch:
+            skip = int(skipmatch.group(1))
+        else:
+            print("Skip value not detected in SSIMU2 file, exiting.")
+            exit(-2)
+        for line in file:
+            match = re.search(r"([0-9]+): ([0-9]+\.[0-9]+)", line)
+            if match:
+                score = float(match.group(2))
+                ssimu2_scores.append(score)
+            else:
+                print(line)
+    return ssimu2_scores, skip
+
+def calculate_std_dev(score_list: list[int]):
+    """
+    Takes a list of metrics scores and returns the associated arithmetic mean,
+    5th percentile and 95th percentile scores.
+
+    :param score_list: list of SSIMU2 scores
+    :type score_list: list
+    """
+
+    filtered_score_list = [score for score in score_list if score >= 0]
+    sorted_score_list = sorted(filtered_score_list)
+    average = sum(filtered_score_list)/len(filtered_score_list)
+    percentile_5 = sorted_score_list[len(filtered_score_list)//20]
+    percentile_95 = sorted_score_list[int (len(filtered_score_list)//(20/19))]
+    return (average, percentile_5, percentile_95)
+
+def generate_zones(ranges: list, percentile_5_total: list, average: int, crf: float, zones_txt_path: str):
+    """
+    Appends a scene change to the ``zones_txt_path`` file in Av1an zones format.
+
+    creates ``zones_txt_path`` if it does not exist. If it does exist, the line is
+    appended to the end of the file.
+
+    :param ranges: Scene changes list
+    :type ranges: list
+    :param percentile_5_total: List containing all 5th percentile scores
+    :type percentile_5_total: list
+    :param average: Full clip average score
+    :type average: int
+    :param crf: CRF setting to use for the zone
+    :type crf: int
+    :param zones_txt_path: Path to the zones.txt file
+    :type zones_txt_path: str
+    """
+    zones_iter = 0
+    for i in range(len(ranges)-1):
+        zones_iter += 1
+        if aggressive:
+            new_crf = crf - ceil((1.0 - (percentile_5_total[i] / average)) * 40 * 4) / 4
+        else:
+            new_crf = crf - ceil((1.0 - (percentile_5_total[i] / average)) * 20 * 4) / 4
+
+        if new_crf < crf - br: # set lowest allowed crf
+            new_crf = crf - br
+
+        if new_crf > crf + br: # set highest allowed crf
+            new_crf = crf + br
+
+        print(f'Enc:  [{ranges[i]}:{ranges[i+1]}]\n'
+              f'Chunk 5th percentile: {percentile_5_total[i]}\n'
+              f'Adjusted CRF: {new_crf:.2f}\n')
+
+        with open(zones_txt_path, "w" if zones_iter == 1 else "a") as file:
+            file.write(f"{ranges[i]} {ranges[i+1]} svt-av1 --crf {new_crf:.2f}\n")
+
+def calculate_metrics(src_file, output_file, tmp_dir, ranges, skip, metrics):
+    match metrics:
+        case 1:
+            ssimu2_txt_path = os.path.join(output_dir, f"{os.path.splitext(os.path.basename(src_file))[0]}_ssimu2.log")
+            calculate_ssimu2(src_file, output_file, ssimu2_txt_path, ranges, skip)
+        case 2:
+            xpsnr_txt_path = os.path.join(output_dir, f"{os.path.splitext(os.path.basename(src_file))[0]}_xpsnr.log")
+            calculate_xpsnr(src_file, output_file, xpsnr_txt_path)
+        case 3:
+            xpsnr_txt_path = os.path.join(output_dir, f"{os.path.splitext(os.path.basename(src_file))[0]}_xpsnr.log")
+            ssimu2_txt_path = os.path.join(output_dir, f"{os.path.splitext(os.path.basename(src_file))[0]}_ssimu2.log")
+            calculate_xpsnr(src_file, output_file, xpsnr_txt_path)
+            calculate_ssimu2(src_file, output_file, ssimu2_txt_path, ranges, skip)
+
+def calculate_zones(tmp_dir, ranges, zones, cq):
+    match zones:
+        case 1:
+            ssimu2_txt_path = os.path.join(output_dir, f"{os.path.splitext(os.path.basename(src_file))[0]}_ssimu2.log")
+            (ssimu2_scores, skip) = get_ssimu2(ssimu2_txt_path)
+            ssimu2_zones_txt_path = f"{tmp_dir}/ssimu2_zones.txt"
+            ssimu2_total_scores: list[int] = []
+            ssimu2_percentile_5_total = []
+            ssimu2_iter = 0
+
+            for i in range(len(ranges)-1):
+                ssimu2_chunk_scores: list[int] = []
+                xpsnr_chunk_scores: list[int] = []
+                ssimu2_frames = (ranges[i+1] - ranges[i]) // skip
+                for frames in range(ssimu2_frames):
+                    ssimu2_score = ssimu2_scores[ssimu2_iter]
+                    ssimu2_chunk_scores.append(ssimu2_score)
+                    ssimu2_total_scores.append(ssimu2_score)
+                    ssimu2_iter += 1
+                (ssimu2_average, ssimu2_percentile_5, ssimu2_percentile_95) = calculate_std_dev(ssimu2_chunk_scores)
+                ssimu2_percentile_5_total.append(ssimu2_percentile_5)
+                #print(f'5th Percentile:  {ssimu2_percentile_5}')
+            (ssimu2_average, ssimu2_percentile_5, ssimu2_percentile_95) = calculate_std_dev(ssimu2_total_scores)
+
+            print(f'SSIMU2:')
+            print(f'Median score:  {ssimu2_average}')
+            print(f'5th Percentile:  {ssimu2_percentile_5}')
+            print(f'95th Percentile:  {ssimu2_percentile_95}\n')
+            generate_zones(ranges, ssimu2_percentile_5_total, ssimu2_average, cq, ssimu2_zones_txt_path)
+
+        case 2:
+            xpsnr_txt_path = os.path.join(output_dir, f"{os.path.splitext(os.path.basename(src_file))[0]}_xpsnr.log")
+            xpsnr_scores: list[int] = get_xpsnr(xpsnr_txt_path)
+            xpsnr_zones_txt_path = f"{tmp_dir}/xpsnr_zones.txt"
+            xpsnr_total_scores: list[int] = []
+            xpsnr_percentile_5_total = []
+            xpsnr_iter = 0
+
+            for i in range(len(ranges)-1):
+                xpsnr_chunk_scores: list[int] = []
+                xpsnr_frames = (ranges[i+1] - ranges[i])
+                for frames in range(xpsnr_frames):
+                    xpsnr_score = xpsnr_scores[xpsnr_iter]
+                    xpsnr_chunk_scores.append(xpsnr_score)
+                    xpsnr_total_scores.append(xpsnr_score)
+                    xpsnr_iter += 1
+                (xpsnr_average, xpsnr_percentile_5, xpsnr_percentile_95) = calculate_std_dev(xpsnr_chunk_scores)
+                xpsnr_percentile_5_total.append(xpsnr_percentile_5)
+            (xpsnr_average, xpsnr_percentile_5, xpsnr_percentile_95) = calculate_std_dev(xpsnr_total_scores)
+
+            print(f'XPSNR:')
+            print(f'Median score:  {xpsnr_average}')
+            print(f'5th Percentile:  {xpsnr_percentile_5}')
+            print(f'95th Percentile:  {xpsnr_percentile_95}\n')
+            generate_zones(ranges, xpsnr_percentile_5_total, xpsnr_average, cq, xpsnr_zones_txt_path)
+
+        case 3:
+            ssimu2_txt_path = os.path.join(output_dir, f"{os.path.splitext(os.path.basename(src_file))[0]}_ssimu2.log")
+            (ssimu2_scores, skip) = get_ssimu2(ssimu2_txt_path)
+            xpsnr_txt_path = os.path.join(output_dir, f"{os.path.splitext(os.path.basename(src_file))[0]}_xpsnr.log")
+            xpsnr_scores: list[int] = get_xpsnr(xpsnr_txt_path)
+
+            multiplied_zones_txt_path = f"{tmp_dir}/multiplied_zones.txt"
+            multiplied_total_scores: list[int] = []
+            multiplied_percentile_5_total = []
+            multiplied_iter = 0
+            for i in range(len(ranges)-1):
+                multiplied_chunk_scores: list[int] = []
+                ssimu2_frames = (ranges[i+1] - ranges[i]) // skip
+                for frames in range(ssimu2_frames):
+                    ssimu2_score = ssimu2_scores[multiplied_iter]
+                    xpsnr_index = (skip*frames) + ranges[i] + 1
+                    xpsnr_scores_averaged = 0
+                    for avg_index in range(skip):
+                        xpsnr_scores_averaged += xpsnr_scores[xpsnr_index + avg_index - 1]
+                    xpsnr_scores_averaged /= skip
+                    multiplied_score = xpsnr_scores_averaged * ssimu2_score
+                    multiplied_chunk_scores.append(multiplied_score)
+                    multiplied_total_scores.append(multiplied_score)
+                    multiplied_iter += 1
+                (multiplied_average, multiplied_percentile_5, multiplied_percentile_95) = calculate_std_dev(multiplied_chunk_scores)
+                multiplied_percentile_5_total.append(multiplied_percentile_5)
+            (multiplied_average, multiplied_percentile_5, multiplied_percentile_95) = calculate_std_dev(multiplied_total_scores)
+
+            print(f'Multiplied:')
+            print(f'Median score:  {multiplied_average}')
+            print(f'5th Percentile:  {multiplied_percentile_5}')
+            print(f'95th Percentile:  {multiplied_percentile_95}\n')
+            generate_zones(ranges, multiplied_percentile_5_total, multiplied_average, cq, multiplied_zones_txt_path)
+
+
+        case 4:
+            ssimu2_txt_path = os.path.join(output_dir, f"{os.path.splitext(os.path.basename(src_file))[0]}_ssimu2.log")
+            (ssimu2_scores, skip) = get_ssimu2(ssimu2_txt_path)
+            xpsnr_txt_path = os.path.join(output_dir, f"{os.path.splitext(os.path.basename(src_file))[0]}_xpsnr.log")
+            xpsnr_scores: list[int] = get_xpsnr(xpsnr_txt_path)
+
+            minimum_zones_txt_path = f"{tmp_dir}/minimum_zones.txt"
+            minimum_total_scores: list[int] = []
+            minimum_percentile_5_total = []
+            minimum_iter = 0
+            ssimu2_total_scores: list[int] = []
+            for ssimu2_iter in range(len(ssimu2_scores)-1):
+                ssimu2_total_scores.append(ssimu2_scores[ssimu2_iter])
+            (ssimu2_average, ssimu2_percentile_5, ssimu2_percentile_95) = calculate_std_dev(ssimu2_total_scores)
+
+            for i in range(len(ranges)-1):
+                minimum_chunk_scores: list[int] = []
+                ssimu2_frames = (ranges[i+1] - ranges[i]) // skip
+                for frames in range(ssimu2_frames):
+                    ssimu2_score = ssimu2_scores[minimum_iter]
+                    xpsnr_index = (skip*frames) + ranges[i] + 1
+                    xpsnr_scores_averaged = 0
+                    for avg_index in range(skip):
+                        xpsnr_scores_averaged += xpsnr_scores[xpsnr_index + avg_index - 1]
+                    xpsnr_scores_averaged /= skip
+                    xpsnr_scores_averaged *= ssimu2_average
+                    minimum_score = min(ssimu2_score, xpsnr_scores_averaged)
+                    minimum_chunk_scores.append(minimum_score)
+                    minimum_total_scores.append(minimum_score)
+                    minimum_iter += 1
+                (minimum_average, minimum_percentile_5, minimum_percentile_95) = calculate_std_dev(minimum_chunk_scores)
+                minimum_percentile_5_total.append(minimum_percentile_5)
+            (minimum_average, minimum_percentile_5, minimum_percentile_95) = calculate_std_dev(minimum_total_scores)
+
+            print(f'Minimum:')
+            print(f'Median score:  {minimum_average}')
+            print(f'5th Percentile:  {minimum_percentile_5}')
+            print(f'95th Percentile:  {minimum_percentile_95}\n')
+            generate_zones(ranges, minimum_percentile_5_total, minimum_average, cq, minimum_zones_txt_path)
+
+match stage:
+    case 0:
+        workers = args.workers
+        crf = float(args.quality)
+        preset = args.preset
+        fast_pass(src_file, output_file, tmp_dir, preset, crf, workers)
+        ranges = get_ranges(scenes_file)
+        metrics = int(args.metrics)
+        calculate_metrics(src_file, output_file, tmp_dir, ranges, skip, metrics)
+        zones = int(args.zones)
+        calculate_zones(tmp_dir, ranges, zones, crf)
+    case 1:
+        workers = args.workers
+        crf = float(args.quality)
+        preset = args.preset
+        fast_pass(src_file, output_file, tmp_dir, preset, crf, workers)
+    case 2:
+        ranges = get_ranges(scenes_file)
+        metrics = int(args.metrics)
+        calculate_metrics(src_file, output_file, tmp_dir, ranges, skip, metrics)
+    case 3:
+        ranges = get_ranges(scenes_file)
+        zones = int(args.zones)
+        crf = float(args.quality)
+        calculate_zones(tmp_dir, ranges, zones, crf)
+    case _:
+        print(f"Stage argument invalid, exiting.")
+        exit(-2)
\ No newline at end of file