timestamp_check.py

import subprocess
import json

def run_ffprobe(file_path, stream_type):
    """Run ffprobe and return the parsed JSON output for a specific stream type."""
    command = [
        'ffprobe', '-v', 'error', '-select_streams', stream_type,
        '-show_entries', 'packet=pts_time,dts_time', '-of', 'json', file_path
    ]
    result = subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)
    return json.loads(result.stdout)

def check_timestamps(video_file):
    """Check timestamps of video and audio streams for inconsistencies."""
    video_data = run_ffprobe(video_file, 'v:0')
    audio_data = run_ffprobe(video_file, 'a:0')

    video_pts = [float(pkt['pts_time']) for pkt in video_data['packets']]
    audio_pts = [float(pkt['pts_time']) for pkt in audio_data['packets']]

    print("Video PTS times (first 10):", video_pts[:10])
    print("Audio PTS times (first 10):", audio_pts[:10])

    # Check for discrepancies in the start times
    if video_pts and audio_pts:
        video_start = video_pts[0]
        audio_start = audio_pts[0]
        print(f"Video start time: {video_start}")
        print(f"Audio start time: {audio_start}")

        if abs(video_start - audio_start) > 0.1:  # Threshold for considering it a sync issue
            print("Warning: Significant start time difference between video and audio streams.")
        else:
            print("No significant start time difference detected.")

    # Check for ongoing discrepancies
    discrepancies = []
    for v_pts, a_pts in zip(video_pts, audio_pts):
        if abs(v_pts - a_pts) > 0.1:  # Threshold for considering it a sync issue
            discrepancies.append((v_pts, a_pts))

    if discrepancies:
        print(f"Found {len(discrepancies)} timestamp discrepancies between video and audio streams.")
    else:
        print("No significant timestamp discrepancies found.")

if __name__ == "__main__":
    video_file_path = 'input_video.mov'  # Change this to your video file path
    check_timestamps(video_file_path)