Loom Video Downloader App (Browser Extension for Chrome & Firefox)

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Loom Video Download Research: Technical Analysis of Stream Patterns, CDNs, and Download Methods

Abstract

Table of Contents

1. Introduction

1.1 Research Scope

1.2 Methodology

2. Loom Video Infrastructure Overview

2.1 CDN Architecture

2.2 Video Processing Pipeline

2.3 Security and Access Control

3. Embed URL Patterns and Detection

3.1 Primary Embed Patterns

3.1.1 Standard Embed URLs

https://www.loom.com/embed/{VIDEO_ID}
https://loom.com/embed/{VIDEO_ID}
https://www.loom.com/share/{VIDEO_ID}
https://loom.com/share/{VIDEO_ID}

3.1.2 Direct Video URLs

https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/mp4/{QUALITY}/video.mp4
https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/webm/{QUALITY}/video.webm

3.1.3 HLS Stream URLs

https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/hls/master.m3u8
https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/hls/{QUALITY}/index.m3u8

3.2 Video ID Extraction Patterns

3.2.1 Standard Format

/embed/([a-f0-9]{32})/
/share/([a-f0-9]{32})/
/v/([a-f0-9]{32})/

3.2.2 Legacy Format Support

/embed/([a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12})/

3.3 Detection Implementation

Command-line Detection Methods

# Extract Loom video IDs from HTML files
grep -oE "https?://(?:www\.)?loom\.com/(?:embed|share)/([a-f0-9]{32})" input.html
# Extract from multiple files
find . -name "*.html" -exec grep -oE "loom\.com/(?:embed|share)/[a-f0-9]{32}" {} +
# Extract video IDs only (without URL)
grep -oE "loom\.com/(?:embed|share)/([a-f0-9]{32})" input.html | grep -oE "[a-f0-9]{32}"

# Test if URL contains downloadable video
yt-dlp --dump-json "https://www.loom.com/share/{VIDEO_ID}" | jq '.id'
# Extract all video information
yt-dlp --dump-json "https://www.loom.com/share/{VIDEO_ID}" > video_info.json
# Check if video is accessible
yt-dlp --list-formats "https://www.loom.com/share/{VIDEO_ID}"

# Using curl to inspect embed pages
curl -s "https://www.loom.com/embed/{VIDEO_ID}" | grep -oE "videoId.*[a-f0-9]{32}"
# Inspect page headers for video information
curl -I "https://www.loom.com/share/{VIDEO_ID}"

4. Stream Formats and CDN Analysis

4.1 Available Stream Formats

4.1.1 MP4 Streams

4.1.2 WebM Streams

4.1.3 HLS Streams

4.2 URL Construction Patterns

4.2.1 MP4 Direct URLs

https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/mp4/720/video.mp4
https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/mp4/1080/video.mp4

4.2.2 HLS Master Playlist

https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/hls/master.m3u8

4.2.3 Quality-specific HLS

https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/hls/720/index.m3u8
https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/hls/1080/index.m3u8

4.3 CDN Failover Strategy

Primary → Secondary CDN

# Primary CDN
https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/mp4/{QUALITY}/video.mp4
# CloudFront backup 
https://d2eebagvwr542c.cloudfront.net/sessions/{VIDEO_ID}/transcoded/mp4/{QUALITY}/video.mp4
# Fastly backup
https://cdn-cf.loom.com/sessions/{VIDEO_ID}/transcoded/mp4/{QUALITY}/video.mp4

# Test primary CDN
curl -I "https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/mp4/720/video.mp4"
# Test CloudFront backup if primary fails
curl -I "https://d2eebagvwr542c.cloudfront.net/sessions/{VIDEO_ID}/transcoded/mp4/720/video.mp4"
# Test Fastly backup if both fail 
curl -I "https://cdn-cf.loom.com/sessions/{VIDEO_ID}/transcoded/mp4/720/video.mp4"

5. yt-dlp Implementation Strategies

5.1 Basic yt-dlp Commands

5.1.1 Standard Download

# Download best quality MP4
yt-dlp "https://www.loom.com/share/{VIDEO_ID}"
# Download specific quality
yt-dlp -f "best[height<=720]" "https://www.loom.com/share/{VIDEO_ID}"
# Download with custom filename
yt-dlp -o "%(uploader)s - %(title)s.%(ext)s" "https://www.loom.com/share/{VIDEO_ID}"

5.1.2 Format Selection

# List available formats
yt-dlp -F "https://www.loom.com/share/{VIDEO_ID}"
# Download specific format by ID
yt-dlp -f 22 "https://www.loom.com/share/{VIDEO_ID}"
# Best video + best audio
yt-dlp -f "bv+ba" "https://www.loom.com/share/{VIDEO_ID}"

5.1.3 Advanced Options

# Download with subtitles
yt-dlp --write-subs --sub-langs en "https://www.loom.com/share/{VIDEO_ID}"
# Download thumbnail
yt-dlp --write-thumbnail "https://www.loom.com/share/{VIDEO_ID}"
# Download metadata
yt-dlp --write-info-json "https://www.loom.com/share/{VIDEO_ID}"
# Rate limiting
yt-dlp --limit-rate 1M "https://www.loom.com/share/{VIDEO_ID}"

5.2 Batch Processing

5.2.1 Multiple Videos

# From file list
yt-dlp -a loom_urls.txt
# With archive tracking
yt-dlp --download-archive downloaded.txt -a loom_urls.txt
# Parallel downloads
yt-dlp --max-downloads 3 -a loom_urls.txt

5.2.2 Quality-specific Batch

# Download all in 720p
yt-dlp -f "best[height<=720]" -a loom_urls.txt
# Download best available under 100MB
yt-dlp -f "best[filesize<100M]" -a loom_urls.txt

5.3 Error Handling and Retries

# Retry on failure
yt-dlp --retries 3 "https://www.loom.com/share/{VIDEO_ID}"
# Ignore errors and continue
yt-dlp --ignore-errors -a loom_urls.txt
# Skip unavailable videos
yt-dlp --no-warnings --ignore-errors -a loom_urls.txt

5.4 Python Integration

5.4 yt-dlp Integration Commands

5.4.1 Video Information Extraction

# Extract video metadata only (no download)
yt-dlp --dump-json "https://www.loom.com/share/{VIDEO_ID}"
# Get available formats
yt-dlp --list-formats "https://www.loom.com/share/{VIDEO_ID}"
# Extract specific information fields
yt-dlp --dump-json "https://www.loom.com/share/{VIDEO_ID}" | jq '.title, .duration, .uploader'

5.4.2 Download Commands with Quality Control

# Download best quality MP4
yt-dlp -f "best[ext=mp4]" "https://www.loom.com/share/{VIDEO_ID}"
# Download with specific quality limit
yt-dlp -f "best[height<=720][ext=mp4]" "https://www.loom.com/share/{VIDEO_ID}"
# Download with metadata and thumbnail
yt-dlp --write-info-json --write-thumbnail --write-subs --sub-langs en "https://www.loom.com/share/{VIDEO_ID}"
# Custom output filename template
yt-dlp -o "%(uploader)s - %(title)s.%(ext)s" "https://www.loom.com/share/{VIDEO_ID}"

5.4.3 Error Handling and Retry Commands

# Download with retries and rate limiting
yt-dlp --retries 5 --limit-rate 1M "https://www.loom.com/share/{VIDEO_ID}"
# Skip unavailable videos in batch
yt-dlp --ignore-errors -a video_urls.txt
# Continue incomplete downloads
yt-dlp --continue "https://www.loom.com/share/{VIDEO_ID}"

6. FFmpeg Processing Techniques

6.1 Stream Analysis

6.1.1 Basic Stream Information

# Analyze stream details
ffprobe -v quiet -print_format json -show_format -show_streams "https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/mp4/720/video.mp4"
# Get duration
ffprobe -v quiet -show_entries format=duration -of csv="p=0" "input.mp4"
# Check codec information
ffprobe -v quiet -select_streams v:0 -show_entries stream=codec_name,width,height -of csv="s=x:p=0" "input.mp4"

6.1.2 HLS Stream Analysis

# Download and analyze HLS stream
ffprobe -v quiet -print_format json -show_format "https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/hls/master.m3u8"
# List available streams in HLS
ffprobe -v quiet -show_streams "https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/hls/master.m3u8"

6.2 Direct Stream Processing

6.2.1 Stream Download and Conversion

# Download HLS stream directly
ffmpeg -i "https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/hls/master.m3u8" -c copy output.mp4
# Download with specific quality
ffmpeg -i "https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/hls/720/index.m3u8" -c copy output_720p.mp4
# Convert WebM to MP4
ffmpeg -i input.webm -c:v libx264 -c:a aac output.mp4

6.2.2 Quality Optimization

# Re-encode for smaller file size
ffmpeg -i input.mp4 -c:v libx264 -crf 23 -c:a aac -b:a 128k output_compressed.mp4
# Fast encode with hardware acceleration
ffmpeg -hwaccel auto -i input.mp4 -c:v h264_nvenc -preset fast output_fast.mp4

6.3 Audio/Video Stream Handling

6.3.1 Separate Audio/Video Streams

# Extract audio only
ffmpeg -i input.mp4 -vn -c:a aac audio_only.aac
# Extract video only
ffmpeg -i input.mp4 -an -c:v copy video_only.mp4
# Combine separate streams
ffmpeg -i video.mp4 -i audio.aac -c copy combined.mp4

6.3.2 Subtitle Processing

# Extract subtitles from stream
ffmpeg -i input.mp4 -map 0:s:0 subtitles.srt
# Embed subtitles into video
ffmpeg -i input.mp4 -i subtitles.srt -c copy -c:s mov_text output_with_subs.mp4
# Burn subtitles into video
ffmpeg -i input.mp4 -vf subtitles=subtitles.srt output_burned_subs.mp4

6.4 Advanced Processing Workflows

6.4.1 Batch Processing Script

#!/bin/bash
# Batch process Loom videos
process_loom_videos() {
 local input_dir="1ドル"
 local output_dir="2ドル"
 
 mkdir -p "$output_dir"
 
 for file in "$input_dir"/*.mp4; do
 if [[ -f "$file" ]]; then
 filename=$(basename "$file" .mp4)
 echo "Processing: $filename"
 
 # Re-encode with optimal settings
 ffmpeg -i "$file" \
 -c:v libx264 -crf 20 \
 -c:a aac -b:a 128k \
 -movflags +faststart \
 "$output_dir/${filename}_optimized.mp4"
 fi
 done
}

6.4.2 Automated Stream Detection

# Detect best stream automatically
detect_best_stream() {
 local url="1ドル"
 
 # Get stream information
 streams=$(ffprobe -v quiet -print_format json -show_streams "$url")
 
 # Find highest resolution video stream
 best_stream=$(echo "$streams" | jq -r '.streams[] | select(.codec_type=="video") | .index' | head -1)
 
 echo "Best video stream: $best_stream"
 return $best_stream
}

7. Alternative Tools and Backup Methods

7.1 Gallery-dl

7.1.1 Installation and Basic Usage

# Install gallery-dl
pip install gallery-dl
# Download Loom video
gallery-dl "https://www.loom.com/share/{VIDEO_ID}"
# Custom configuration
gallery-dl --config gallery-dl.conf "https://www.loom.com/share/{VIDEO_ID}"

7.1.2 Configuration for Loom

{
 "extractor": {
 "loom": {
 "filename": "{uploader} - {title}.{extension}",
 "directory": ["loom", "{uploader}"],
 "quality": "best"
 }
 }
}

7.2 Streamlink

7.2.1 Basic Streamlink Usage

# Install streamlink
pip install streamlink
# Download Loom HLS stream
streamlink "https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/hls/master.m3u8" best -o output.mp4
# Specify quality
streamlink "https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/hls/master.m3u8" 720p -o output_720p.mp4

7.3 Wget/cURL for Direct Downloads

7.3.1 Direct MP4 Downloads

# Using wget
wget -O "loom_video.mp4" "https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/mp4/720/video.mp4"
# Using cURL with headers
curl -H "User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36" \
 -H "Referer: https://www.loom.com/" \
 -o "loom_video.mp4" \
 "https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/mp4/720/video.mp4"

7.3.2 Batch Download Script

#!/bin/bash
# Batch download with fallback
download_with_fallback() {
 local video_id="1ドル"
 local quality="${2:-720}"
 local output_file="loom_${video_id}_${quality}p.mp4"
 
 urls=(
 "https://cdn.loom.com/sessions/${video_id}/transcoded/mp4/${quality}/video.mp4"
 "https://d2eebagvwr542c.cloudfront.net/sessions/${video_id}/transcoded/mp4/${quality}/video.mp4"
 "https://cdn-cf.loom.com/sessions/${video_id}/transcoded/mp4/${quality}/video.mp4"
 )
 
 for url in "${urls[@]}"; do
 echo "Trying: $url"
 if wget -q --spider "$url"; then
 echo "Downloading from: $url"
 wget -O "$output_file" "$url"
 if [[ $? -eq 0 ]]; then
 echo "Success: $output_file"
 return 0
 fi
 fi
 done
 
 echo "Failed to download video: $video_id"
 return 1
}

7.4 Browser-based Network Monitoring

7.4.1 Browser Developer Tools Approach

# Manual network monitoring commands for identifying video URLs
# 1. Open browser developer tools (F12)
# 2. Go to Network tab
# 3. Filter by "mp4" or "m3u8"
# 4. Play the Loom video
# 5. Copy URLs from network requests
# Alternative: Use browser's built-in network export
# Export HAR file and extract video URLs:
grep -oE "https://[^\"]*\.(mp4|m3u8)" network_export.har

7.4.2 Command-line Network Monitoring

# Monitor network traffic during video playback
# Using netstat to monitor connections
netstat -t -c | grep ":443"
# Using tcpdump to capture network packets (requires root)
tcpdump -i any host cdn.loom.com
# Using ngrep to search for specific patterns
ngrep -q -d any "\.mp4\|\.m3u8" host cdn.loom.com

7.5 Mobile App Considerations

7.5.1 Android ADB Method

# Extract URLs from Android app
adb shell "cat /data/data/com.loom.mobile/cache/video_cache/* | grep -o 'https://[^\"]*\.mp4'"
# Monitor network traffic
adb shell "cat /proc/net/tcp | grep :80"

7.5.2 iOS Network Monitoring

# Using iOS device console logs
xcrun simctl spawn booted log stream --predicate 'eventMessage contains "mp4"'

8. Implementation Recommendations

8.1 Primary Implementation Strategy

8.1.1 Hierarchical Command Approach

#!/bin/bash
# Primary download strategy script
download_loom_video() {
 local video_url="1ドル"
 local output_dir="${2:-./downloads}"
 
 echo "Attempting download of: $video_url"
 
 # Method 1: yt-dlp (primary)
 if yt-dlp --ignore-errors -o "$output_dir/%(title)s.%(ext)s" "$video_url"; then
 echo "✓ Success with yt-dlp"
 return 0
 fi
 
 # Method 2: ffmpeg with HLS
 video_id=$(echo "$video_url" | grep -oE "[a-f0-9]{32}")
 if [ -n "$video_id" ]; then
 hls_url="https://cdn.loom.com/sessions/$video_id/transcoded/hls/master.m3u8"
 if ffmpeg -i "$hls_url" -c copy "$output_dir/loom_$video_id.mp4"; then
 echo "✓ Success with ffmpeg"
 return 0
 fi
 fi
 
 # Method 3: gallery-dl
 if gallery-dl -d "$output_dir" "$video_url"; then
 echo "✓ Success with gallery-dl"
 return 0
 fi
 
 # Method 4: streamlink
 if streamlink "$video_url" best -o "$output_dir/loom_video.mp4"; then
 echo "✓ Success with streamlink"
 return 0
 fi
 
 echo "✗ All methods failed"
 return 1
}

8.1.2 Quality Selection Commands

# Inspect available qualities first
yt-dlp -F "https://www.loom.com/share/{VIDEO_ID}"
# Download specific quality with fallback
yt-dlp -f "best[height<=720]/best[height<=480]/best" "https://www.loom.com/share/{VIDEO_ID}"
# Check file size before download
yt-dlp --dump-json "https://www.loom.com/share/{VIDEO_ID}" | jq '.filesize_approx // .filesize'
# Download with size limit
yt-dlp -f "best[filesize<500M]" "https://www.loom.com/share/{VIDEO_ID}"
# Quality selection script
select_quality() {
 local video_url="1ドル"
 local max_quality="${2:-720}"
 local max_size_mb="${3:-500}"
 
 echo "Checking available formats..."
 yt-dlp -F "$video_url"
 
 echo "Downloading with quality limit: ${max_quality}p, size limit: ${max_size_mb}MB"
 yt-dlp -f "best[height<=$max_quality][filesize<${max_size_mb}M]/best[height<=$max_quality]/best" "$video_url"
}

8.2 Error Handling and Resilience

8.2.1 Retry Commands with Backoff

# Download with retries and exponential backoff
download_with_retries() {
 local url="1ドル"
 local max_retries=3
 local delay=1
 
 for i in $(seq 1 $max_retries); do
 if yt-dlp --retries 2 "$url"; then
 return 0
 fi
 
 echo "Attempt $i failed, waiting ${delay}s..."
 sleep $delay
 delay=$((delay * 2))
 done
 
 return 1
}
# Check URL accessibility before download
check_url_status() {
 local url="1ドル"
 
 # Test direct access
 if curl -I --max-time 10 "$url" | grep -q "200 OK"; then
 echo "URL accessible"
 return 0
 fi
 
 # Test with different user agent
 if curl -I --max-time 10 -H "User-Agent: Mozilla/5.0 (compatible; Loom-Downloader)" "$url" | grep -q "200 OK"; then
 echo "URL accessible with custom user agent"
 return 0
 fi
 
 echo "URL not accessible"
 return 1
}
# Handle rate limiting
handle_rate_limit() {
 local url="1ドル"
 
 # Download with rate limiting
 yt-dlp --limit-rate 1M --retries 5 --fragment-retries 3 "$url"
 
 # If rate limited, wait and retry
 if [ $? -eq 1 ]; then
 echo "Rate limited, waiting 60 seconds..."
 sleep 60
 yt-dlp --limit-rate 500K "$url"
 fi
}

8.2.2 Fallback URL Testing

# Test multiple CDN endpoints
test_fallback_urls() {
 local video_id="1ドル"
 local quality="${2:-720}"
 
 local urls=(
 "https://cdn.loom.com/sessions/$video_id/transcoded/mp4/$quality/video.mp4"
 "https://d2eebagvwr542c.cloudfront.net/sessions/$video_id/transcoded/mp4/$quality/video.mp4"
 "https://cdn-cf.loom.com/sessions/$video_id/transcoded/mp4/$quality/video.mp4"
 "https://cdn.loom.com/sessions/$video_id/transcoded/hls/master.m3u8"
 )
 
 for url in "${urls[@]}"; do
 echo "Testing: $url"
 if curl -I --max-time 5 "$url" | grep -q "200\|302"; then
 echo "✓ Available: $url"
 else
 echo "✗ Failed: $url"
 fi
 done
}
# Download with automatic fallback
download_with_fallback() {
 local video_id="1ドル"
 local quality="${2:-720}"
 local output_dir="${3:-./downloads}"
 
 # Try primary CDN first
 if yt-dlp "https://www.loom.com/share/$video_id"; then
 return 0
 fi
 
 # Try direct MP4 URLs
 local urls=(
 "https://cdn.loom.com/sessions/$video_id/transcoded/mp4/$quality/video.mp4"
 "https://d2eebagvwr542c.cloudfront.net/sessions/$video_id/transcoded/mp4/$quality/video.mp4"
 "https://cdn-cf.loom.com/sessions/$video_id/transcoded/mp4/$quality/video.mp4"
 )
 
 for url in "${urls[@]}"; do
 if wget -O "$output_dir/loom_$video_id.mp4" "$url"; then
 echo "✓ Downloaded from: $url"
 return 0
 fi
 done
 
 # Try HLS as last resort
 ffmpeg -i "https://cdn.loom.com/sessions/$video_id/transcoded/hls/master.m3u8" -c copy "$output_dir/loom_$video_id.mp4"
}

8.3 Performance Optimization

8.3.1 Parallel Batch Processing

# Download multiple videos in parallel
download_batch_parallel() {
 local url_file="1ドル"
 local max_jobs="${2:-4}"
 local output_dir="${3:-./downloads}"
 
 # Using GNU parallel
 parallel -j $max_jobs yt-dlp -o "$output_dir/%(title)s.%(ext)s" {} :::: "$url_file"
}
# Alternative using xargs
download_batch_xargs() {
 local url_file="1ドル"
 local max_jobs="${2:-4}"
 local output_dir="${3:-./downloads}"
 
 cat "$url_file" | xargs -P $max_jobs -I {} yt-dlp -o "$output_dir/%(title)s.%(ext)s" {}
}
# Process multiple videos with progress
batch_download_with_logging() {
 local url_file="1ドル"
 local log_file="downloads.log"
 
 total_count=$(wc -l < "$url_file")
 current=0
 
 while IFS= read -r url; do
 ((current++))
 echo "[$current/$total_count] Processing: $url" | tee -a "$log_file"
 
 if yt-dlp "$url" 2>&1 | tee -a "$log_file"; then
 echo "✓ Success" | tee -a "$log_file"
 else
 echo "✗ Failed" | tee -a "$log_file"
 fi
 done < "$url_file"
}

8.3.2 Progress Monitoring

# Download with progress monitoring
download_with_progress() {
 local url="1ドル"
 local output_file="2ドル"
 
 # Using yt-dlp with progress hooks
 yt-dlp --newline --progress-template "download:%(progress._percent_str)s %(progress._speed_str)s ETA %(progress._eta_str)s" -o "$output_file" "$url"
}
# Monitor download speed and adjust
monitor_download_speed() {
 local url="1ドル"
 
 # Test connection speed first
 local test_speed=$(curl -w "%{speed_download}" -o /dev/null -s "$url" | head -c 10)
 
 if (( $(echo "$test_speed < 1000000" | bc -l) )); then
 echo "Slow connection detected, using rate limiting"
 yt-dlp --limit-rate 500K "$url"
 else
 echo "Good connection, downloading at full speed"
 yt-dlp "$url"
 fi
}
# Real-time progress with file size monitoring
track_download_progress() {
 local url="1ドル"
 local output_file="2ドル"
 
 # Start download in background
 yt-dlp -o "$output_file" "$url" &
 local download_pid=$!
 
 # Monitor file size growth
 while kill -0 $download_pid 2>/dev/null; do
 if [ -f "$output_file" ]; then
 local size=$(du -h "$output_file" 2>/dev/null | cut -f1)
 echo -ne "\rDownloaded: $size"
 fi
 sleep 2
 done
 echo ""
 
 wait $download_pid
 return $?
}

8.4 Integration Best Practices

8.4.1 Configuration Management

# config.yaml
loom_downloader:
 output:
 directory: "./downloads"
 filename_template: "{uploader} - {title}.{ext}"
 create_subdirs: true
 
 quality:
 preferred: "720p"
 fallback: ["480p", "360p"]
 max_filesize_mb: 500
 
 network:
 timeout: 30
 retries: 3
 rate_limit: "1M"
 user_agent: "Mozilla/5.0 (compatible; LoomDownloader/1.0)"
 
 tools:
 primary: "yt-dlp"
 fallback: ["ffmpeg", "wget"]
 yt_dlp_path: "/usr/local/bin/yt-dlp"
 ffmpeg_path: "/usr/local/bin/ffmpeg"

8.4.2 Logging and Monitoring Commands

# Setup logging directory and files
setup_logging() {
 local log_dir="./logs"
 mkdir -p "$log_dir"
 
 # Create log files with timestamps
 local date_stamp=$(date +"%Y%m%d")
 export DOWNLOAD_LOG="$log_dir/downloads_$date_stamp.log"
 export ERROR_LOG="$log_dir/errors_$date_stamp.log"
 export STATS_LOG="$log_dir/stats_$date_stamp.log"
}
# Log download activity
log_download() {
 local action="1ドル"
 local video_id="2ドル"
 local url="3ドル"
 local timestamp=$(date '+%Y-%m-%d %H:%M:%S')
 
 case "$action" in
 "start")
 echo "[$timestamp] START: $video_id | URL: $url" >> "$DOWNLOAD_LOG"
 ;;
 "complete")
 local file_path="4ドル"
 local file_size=$(du -h "$file_path" 2>/dev/null | cut -f1)
 echo "[$timestamp] COMPLETE: $video_id | File: $file_path | Size: $file_size" >> "$DOWNLOAD_LOG"
 ;;
 "error")
 local error_msg="4ドル"
 echo "[$timestamp] ERROR: $video_id | Error: $error_msg" >> "$ERROR_LOG"
 ;;
 esac
}
# Monitor download statistics
track_download_stats() {
 local stats_file="$STATS_LOG"
 
 # Count downloads by status
 local total=$(grep -c "START:" "$DOWNLOAD_LOG" 2>/dev/null || echo 0)
 local completed=$(grep -c "COMPLETE:" "$DOWNLOAD_LOG" 2>/dev/null || echo 0)
 local failed=$(grep -c "ERROR:" "$ERROR_LOG" 2>/dev/null || echo 0)
 
 # Calculate success rate
 local success_rate=0
 if [ $total -gt 0 ]; then
 success_rate=$(( (completed * 100) / total ))
 fi
 
 echo "Download Statistics:" | tee -a "$stats_file"
 echo "Total attempts: $total" | tee -a "$stats_file"
 echo "Completed: $completed" | tee -a "$stats_file"
 echo "Failed: $failed" | tee -a "$stats_file"
 echo "Success rate: $success_rate%" | tee -a "$stats_file"
}
# Export download report
generate_download_report() {
 local output_file="${1:-download_report.txt}"
 local timestamp=$(date '+%Y-%m-%d %H:%M:%S')
 
 echo "Loom Download Report - Generated: $timestamp" > "$output_file"
 echo "============================================" >> "$output_file"
 echo "" >> "$output_file"
 
 track_download_stats >> "$output_file"
 
 echo "" >> "$output_file"
 echo "Recent Downloads:" >> "$output_file"
 tail -20 "$DOWNLOAD_LOG" >> "$output_file" 2>/dev/null
 
 echo "" >> "$output_file"
 echo "Recent Errors:" >> "$output_file"
 tail -10 "$ERROR_LOG" >> "$output_file" 2>/dev/null
}

9. Troubleshooting and Edge Cases

9.1 Common Issues and Solutions

9.1.1 Authentication and Access Control Commands

# Test different referer headers
test_referer_headers() {
 local url="1ドル"
 local referers=(
 "https://www.loom.com/"
 "https://loom.com/"
 "https://app.loom.com/"
 "" # No referer
 )
 
 for referer in "${referers[@]}"; do
 echo "Testing with referer: $referer"
 if [ -n "$referer" ]; then
 curl -I -H "Referer: $referer" "$url"
 else
 curl -I "$url"
 fi
 echo "---"
 done
}
# Download with authentication headers
download_with_auth() {
 local url="1ドル"
 local output_dir="${2:-./downloads}"
 
 # Try with various user agents and headers
 local user_agents=(
 "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36"
 "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36"
 "Mozilla/5.0 (compatible; Loom-Downloader/1.0)"
 )
 
 for ua in "${user_agents[@]}"; do
 echo "Trying with User-Agent: $ua"
 if yt-dlp --user-agent "$ua" --add-header "Referer:https://www.loom.com/" -o "$output_dir/%(title)s.%(ext)s" "$url"; then
 echo "✓ Success with User-Agent: $ua"
 return 0
 fi
 done
 
 echo "✗ All authentication methods failed"
 return 1
}
# Check access permissions
check_video_access() {
 local video_url="1ドル"
 
 echo "Checking video accessibility..."
 
 # Extract video ID
 local video_id=$(echo "$video_url" | grep -oE "[a-f0-9]{32}")
 
 if [ -z "$video_id" ]; then
 echo "✗ Invalid video URL format"
 return 1
 fi
 
 # Test various endpoints
 local test_urls=(
 "https://www.loom.com/share/$video_id"
 "https://www.loom.com/embed/$video_id"
 "https://cdn.loom.com/sessions/$video_id/transcoded/mp4/720/video.mp4"
 )
 
 for test_url in "${test_urls[@]}"; do
 echo "Testing: $test_url"
 local status=$(curl -o /dev/null -s -w "%{http_code}" "$test_url")
 echo "Status: $status"
 
 if [ "$status" = "200" ] || [ "$status" = "302" ]; then
 echo "✓ Video accessible"
 return 0
 fi
 done
 
 echo "✗ Video not accessible - may be private or deleted"
 return 1
}

9.1.2 Rate Limiting and Throttling Commands

# Rate-limited download function
rate_limited_download() {
 local url="1ドル"
 local rate_limit="${2:-1M}"
 local calls_per_minute="${3:-30}"
 
 # Calculate delay between calls
 local delay_seconds=$((60 / calls_per_minute))
 
 echo "Rate limiting: $calls_per_minute calls/minute (${delay_seconds}s delay)"
 
 # Download with rate limiting
 yt-dlp --limit-rate "$rate_limit" "$url"
 
 # Wait before next call
 echo "Waiting ${delay_seconds} seconds before next download..."
 sleep "$delay_seconds"
}
# Batch download with rate limiting
batch_download_rate_limited() {
 local url_file="1ドル"
 local rate_limit="${2:-500K}"
 local delay="${3:-2}"
 
 echo "Starting rate-limited batch download..."
 echo "Rate limit: $rate_limit, Delay: ${delay}s between downloads"
 
 while IFS= read -r url; do
 echo "Downloading: $url"
 yt-dlp --limit-rate "$rate_limit" "$url"
 
 echo "Waiting ${delay} seconds..."
 sleep "$delay"
 done < "$url_file"
}
# Monitor and adjust download speed
adaptive_rate_limiting() {
 local url="1ドル"
 local max_speed="2M"
 local min_speed="500K"
 
 echo "Starting adaptive rate limiting..."
 
 # Try maximum speed first
 if yt-dlp --limit-rate "$max_speed" "$url"; then
 echo "✓ Download successful at maximum speed"
 else
 echo "Rate limited, retrying with reduced speed..."
 sleep 30
 
 # Try reduced speed
 if yt-dlp --limit-rate "$min_speed" "$url"; then
 echo "✓ Download successful at reduced speed"
 else
 echo "✗ Download failed even with rate limiting"
 return 1
 fi
 fi
}

pass

#### 9.1.3 Geo-blocking and VPN Detection
```python
def handle_geo_restrictions(url, proxy_list=None):
 """Attempt downloads through different proxies for geo-restricted content"""
 
 if proxy_list is None:
 proxy_list = [
 None, # Direct connection
 {'http': 'socks5://127.0.0.1:9050', 'https': 'socks5://127.0.0.1:9050'}, # Tor
 # Add other proxy configurations
 ]
 
 for proxy_config in proxy_list:
 try:
 response = requests.get(url, proxies=proxy_config, timeout=30)
 if response.status_code == 200:
 return response
 except:
 continue
 
 raise Exception("Unable to access content through any proxy")

9.2 Format-specific Issues

9.2.1 HLS Stream Problems

# Diagnose HLS stream issues
ffprobe -v error -show_format -show_streams "https://cdn.loom.com/sessions/{VIDEO_ID}/transcoded/hls/master.m3u8"
# Download with segment retry
ffmpeg -protocol_whitelist file,http,https,tcp,tls -max_reload 5 -i "master.m3u8" -c copy output.mp4
# Handle broken segments
ffmpeg -err_detect ignore_err -i "master.m3u8" -c copy output.mp4

9.2.2 Codec Compatibility

# Convert for maximum compatibility
ffmpeg -i input.webm -c:v libx264 -profile:v baseline -level 3.0 -c:a aac -ac 2 -b:a 128k output_compatible.mp4
# Handle unsupported codecs
ffmpeg -i input.mp4 -c:v libx264 -c:a aac -avoid_negative_ts make_zero output_fixed.mp4

9.3 Performance Troubleshooting

9.3.1 Slow Download Diagnosis

def diagnose_slow_downloads(url):
 """Diagnose and report on slow download performance"""
 
 start_time = time.time()
 
 # Test connection speed
 response = requests.get(url, stream=True, timeout=10)
 first_byte_time = time.time() - start_time
 
 # Download first MB to estimate speed
 downloaded = 0
 speed_test_start = time.time()
 
 for chunk in response.iter_content(chunk_size=8192):
 downloaded += len(chunk)
 if downloaded >= 1024 * 1024: # 1MB
 break
 
 elapsed = time.time() - speed_test_start
 speed_mbps = (downloaded / elapsed) / (1024 * 1024)
 
 return {
 'first_byte_time': first_byte_time,
 'speed_mbps': speed_mbps,
 'status_code': response.status_code,
 'headers': dict(response.headers)
 }

9.3.2 Memory Usage Optimization

def stream_download(url, output_path, chunk_size=8192):
 """Memory-efficient streaming download"""
 
 with requests.get(url, stream=True) as response:
 response.raise_for_status()
 
 with open(output_path, 'wb') as f:
 for chunk in response.iter_content(chunk_size=chunk_size):
 if chunk: # Filter out keep-alive chunks
 f.write(chunk)

9.4 Quality and Corruption Issues

9.4.1 Video Integrity Verification

import hashlib
def verify_download_integrity(file_path, expected_size=None, expected_hash=None):
 """Verify downloaded file integrity"""
 
 if not os.path.exists(file_path):
 return False, "File does not exist"
 
 # Check file size
 actual_size = os.path.getsize(file_path)
 if expected_size and actual_size != expected_size:
 return False, f"Size mismatch: expected {expected_size}, got {actual_size}"
 
 # Check file hash if provided
 if expected_hash:
 sha256_hash = hashlib.sha256()
 with open(file_path, "rb") as f:
 for chunk in iter(lambda: f.read(4096), b""):
 sha256_hash.update(chunk)
 
 actual_hash = sha256_hash.hexdigest()
 if actual_hash != expected_hash:
 return False, f"Hash mismatch: expected {expected_hash}, got {actual_hash}"
 
 # Basic video file validation using ffprobe
 try:
 result = subprocess.run([
 'ffprobe', '-v', 'error', '-select_streams', 'v:0',
 '-show_entries', 'stream=codec_name', '-of', 'csv=p=0',
 file_path
 ], capture_output=True, text=True, timeout=30)
 
 if result.returncode != 0:
 return False, "Video file appears to be corrupted"
 except:
 return False, "Unable to verify video integrity"
 
 return True, "File integrity verified"

9.4.2 Automatic Repair Attempts

# Attempt to repair corrupted MP4
ffmpeg -err_detect ignore_err -i corrupted.mp4 -c copy repaired.mp4
# Fix timestamp issues
ffmpeg -i input.mp4 -avoid_negative_ts make_zero -c copy fixed.mp4
# Reconstruct index for seeking
ffmpeg -i input.mp4 -c copy -movflags +faststart output.mp4

10. Conclusion

10.1 Summary of Findings

10.2 Recommended Implementation Approach

10.3 Tool Recommendations

10.4 Performance Considerations

10.5 Security and Compliance Notes

10.6 Future Research Directions

10.7 Maintenance and Updates