{py:load {video}
import os, subprocess, json, random, time, re

in_path = os.getenv('FILE_1')
if not in_path:
    print('no input file passed in')
    raise SystemExit(1)

def detect_ext(p):
    base = os.path.basename(p)
    _, ext = os.path.splitext(base)
    if ext:
        return ext.lower()
    try:
        fmt = subprocess.check_output(
            ['ffprobe','-v','error','-show_entries','format=format_name','-of','default=noprint_wrappers=1:nokey=1', p]
        ).decode().strip()
        
        if 'mp4' in fmt:
            return '.mp4'
        if 'mov' in fmt:
            return '.mov'
        if 'matroska' in fmt or 'webm' in fmt or 'mkv' in fmt:
            return '.mkv'
        if 'avi' in fmt:
            return '.avi'
    except Exception:
        pass
    return '.mp4'  

num = int(time.time()*1000) ^ random.randint(0, 1_000_000)
ext = detect_ext(in_path) or '.mp4'

out_path = f'/home/notsocoder/output/concat_{num}{ext}'

def ffprobe_duration(p):
    cmd = ['ffprobe','-v','error','-show_entries','format=duration','-of','default=noprint_wrappers=1:nokey=1',p]
    try:
        dur = float(subprocess.check_output(cmd).decode().strip() or 0.0)
    except Exception:
        dur = 0.0
    return max(0.0, dur)

dur = ffprobe_duration(in_path)
if dur == 0:
    print('no duration found')
    raise SystemExit(0)

seg_dir = '/home/notsocoder/input/segs'
rev_dir = '/home/notsocoder/input/rev'
os.makedirs(seg_dir, exist_ok=True)
os.makedirs(rev_dir, exist_ok=True)

subprocess.check_call([
    'ffmpeg','-y','-loglevel','error','-i', in_path,
    '-f','segment','-segment_time','1',
    '-reset_timestamps','1',
    os.path.join(seg_dir, f'f_%04d{ext}')])

forward = sorted([f for f in os.listdir(seg_dir) if f.startswith('f_') and f.endswith(ext)])

reverse = []
for f in forward:
    fin = os.path.join(seg_dir, f)
    fout = os.path.join(rev_dir, f.replace('f_','r_'))
    subprocess.check_call([
        'ffmpeg','-loglevel','error','-y','-i', fin,
        '-vf','reverse','-af','areverse',
        fout
    ])
    reverse.append(fout)

pairs = []
for i, f in enumerate(forward):
    fpath = os.path.join(seg_dir, f)
    rpath = reverse[i] if i < len(reverse) else None
    pairs.append(fpath)
    if rpath:
        pairs.append(rpath)

list_path = f'/home/notsocoder/input/list_{num}.txt'
with open(list_path,'w') as fw:
    for p in pairs:
        fw.write(f"file '{p}'\n")


subprocess.check_call([
    'ffmpeg','-y','-loglevel','error','-f','concat','-safe','0','-i', list_path, out_path])

print('created:', out_path)}