Juq-516.mp4 May 2026

import cv2, imagehash, PIL.Image
cap = cv2.VideoCapture('JUQ-516.mp4')
prev_hash = None
frame_no = 0
while True:
    ret, frame = cap.read()
    if not ret: break
    pil = PIL.Image.fromarray(cv2.cvtColor(frame, cv2.COLOR_BGR2RGB))
    cur_hash = imagehash.phash(pil)
    if prev_hash and cur_hash - prev_hash > 10:   # threshold
        print(f"Possible edit around frame frame_no")
    prev_hash = cur_hash
    frame_no += 1

| Issue | Guidance | |-------|----------| | Privacy | Blur faces or license plates before public sharing unless you have explicit consent or a legitimate public‑interest reason. | | Copyright | If the video is not in the public domain, limit distribution to “for analysis only” and cite the source. | | Chain of Custody | For legal cases, maintain a strict audit trail (hashes after each operation). | | Disclosure | Be transparent about tool limitations (e.g., “Our hash‑threshold method may generate false positives in low‑motion scenes”). | JUQ-516.mp4

ffprobe -v quiet -print_format json -show_format -show_streams JUQ-516.mp4 > metadata.json

Key fields to note:

| Field | What It Tells You | |-------|-------------------| | format_name | Container type (mov,mp4,m4a,…). | | duration | Total runtime (seconds). | | size | File size (bytes). | | bit_rate | Overall bitrate. | | tags (if present) | Creator, encoder, creation_time, etc. | | streams → codec_name | Video codec (h264, hevc, …) and audio codec (aac, mp3, …). | | width / height | Resolution. | | r_frame_rate | Nominal frame rate (e.g., 30/1). | | display_aspect_ratio | Aspect ratio (16:9, 4:3, etc.). | | color_space, color_transfer, color_primaries | Colour‑encoding details (useful for forensic colour‑matching). | Compression Artifacts

| Technique | Tools | What You Get | |-----------|-------|--------------| | Frame‑by‑frame extraction | ffmpeg -i JUQ-516.mp4 -vf "select=eq(pict_type\,I)" -vsync vfr keyframes_%04d.jpg | All I‑frames (keyframes) as JPEGs for quick visual inspection. | | Full frame dump | ffmpeg -i JUQ-516.mp4 frame_%05d.png | Every frame as PNG (useful for detecting subtle tampering). | | Scene change detection | ffprobe -show_frames -show_entries frame=pict_type -select_streams v -i JUQ-516.mp4 | List of frame types; spikes in I‑frames can hint at cuts. | | Audio waveform / spectrogram | Audacity (import MP4) or sox (sox JUQ-516.mp4 -n spectrogram) | Visual view of speech, background noises, or hidden audio. | | Speech‑to‑text | Google Cloud Speech‑to‑Text, Whisper (whisper JUQ-516.mp4 --model base) | Text transcription for keyword search. | | Object / face detection | OpenCV, YOLOv8, Amazon Rekognition | Automated tagging of people, vehicles, logos, etc. |

A well‑structured report makes your work reproducible and defensible. Frame‑Level Hashing

| Section | What to Include | |---------|-----------------| | Executive Summary | One‑paragraph overview of the video’s provenance, key findings, and conclusions. | | Methodology | List of tools (versions), commands, and any VM or sandbox configurations. | | Metadata Summary | Tables of container, video, and audio metadata (from ffprobe, exiftool). | | Content Overview | Timeline of notable events, with timestamps and short descriptions. | | Manipulation Analysis | Evidence of edits (hash jumps, metadata anomalies, visual artifacts). | | Contextual Evidence | Links to external references, geolocation maps, reverse‑image hits. | | Appendices | Full hash logs, raw ffprobe JSON, sample frames, spectrogram images. | | Chain of Custody | Dates/times of each handling step, who performed them, and hash verification after each step. |

Tip: Store the report as a PDF with an embedded SHA‑256 checksum (e.g., sha256sum report.pdf > report.sha256). This guarantees the report itself has not been altered.

# 1️⃣ Get a human‑readable summary
ffprobe -v error -show_format -show_streams JUQ-516.mp4
# 2️⃣ Trim the first 10 seconds off (re‑encode)
ffmpeg -ss 00:00:10 -i JUQ-516.mp4 -c:v libx264 -crf 23 -c:a aac trimmed.mp4
# 3️⃣ Convert to a web‑friendly MP4 (H.264 + AAC, 720p)
ffmpeg -i JUQ-516.mp4 -vf "scale=-2:720" -c:v libx264 -crf 23 -preset fast -c:a aac -b:a 128k JUQ-516_720p.mp4
# 4️⃣ Extract the audio as MP3
ffmpeg -i JUQ-516.mp4 -vn -c:a libmp3lame -q:a 2 JUQ-516.mp3
# 5️⃣ Verify integrity (no errors = OK)
ffmpeg -v error -i JUQ-516.mp4 -f null -