Update

bash/test_prores_to_hevc.sh

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+#!/bin/bash
+
+# Fixed script to convert ProRes 4444 alpha to HEVC alpha
+# Usage: ./test_prores_to_hevc.sh input.mov
+
+if [ $# -eq 0 ]; then
+    echo "Usage: $0 input_prores4444.mov"
+    echo "Example: ./test_prores_to_hevc.sh animation.mov"
+    exit 1
+fi
+
+prores_file="$1"
+
+# Check if input file exists
+if [ ! -f "$prores_file" ]; then
+    echo "Error: File '$prores_file' not found."
+    exit 1
+fi
+
+# Generate output filename
+base_name=$(basename "$prores_file" .mov)
+hevc_output="${base_name}_hevc.mov"
+
+echo "=== Testing ProRes 4444 to HEVC Alpha Conversion ==="
+echo "Input ProRes:  $prores_file"
+echo "Output HEVC:   $hevc_output"
+echo ""
+
+# Check input file properties
+echo "=== Input File Analysis ==="
+echo "ProRes file properties:"
+ffprobe -v quiet -select_streams v:0 -show_entries stream=codec_name,pix_fmt,width,height,bit_rate -of csv=p=0 "$prores_file"
+echo ""
+
+# Check if input has alpha channel (HEVC embeds alpha natively)
+has_alpha=$(ffprobe -v quiet -select_streams v:0 -show_entries stream=pix_fmt -of csv=p=0 "$prores_file" | grep -E "(yuva|rgba|argb|bgra|abgr)")
+if [ -z "$has_alpha" ]; then
+    echo "Note: Input shows standard pixel format (HEVC will embed alpha natively if present)"
+fi
+
+# Show input file size
+input_size=$(stat -f%z "$prores_file" 2>/dev/null || stat -c%s "$prores_file" 2>/dev/null)
+echo "Input file size: $(awk "BEGIN {printf \"%.1f\", $input_size/1024/1024}")MB"
+echo ""
+
+# Test if VideoToolbox supports HEVC on this system
+echo "=== Testing VideoToolbox HEVC Support ==="
+vt_test=$(ffmpeg -f lavfi -i "color=red:size=100x100:duration=1" -c:v hevc_videotoolbox -f null - 2>&1)
+if echo "$vt_test" | grep -q "not supported\|failed\|error"; then
+    echo "VideoToolbox doesn't support HEVC on this system, falling back to software encoder"
+    use_software=true
+else
+    echo "VideoToolbox HEVC support detected"
+    use_software=false
+fi
+echo ""
+
+# Convert ProRes 4444 to HEVC Alpha with improved settings
+echo "=== Converting ProRes 4444 to HEVC Alpha ==="
+
+if [ "$use_software" = true ]; then
+    # Software encoder fallback matching Apple's settings
+    echo "Using software HEVC encoder (libx265)..."
+    cmd="ffmpeg -y -i \"$prores_file\" -map 0:a -map 0:v -c:a aac -b:a 129k -c:v libx265 -b:v 4885k -preset medium -colorspace bt709 -color_primaries bt709 -color_trc bt709 -movflags +faststart \"$hevc_output\""
+    echo "Command: $cmd"
+    echo ""
+
+    ffmpeg -y -i "$prores_file" \
+        -map 0:a -map 0:v \
+        -c:a aac -b:a 129k \
+        -c:v libx265 \
+        -b:v 4885k \
+        -preset medium \
+        -colorspace bt709 \
+        -color_primaries bt709 \
+        -color_trc bt709 \
+        -movflags +faststart \
+        "$hevc_output"
+else
+    # VideoToolbox matching Apple's exact Encode Media output
+    echo "Using VideoToolbox HEVC encoder (matching Apple's exact Encode Media)..."
+    cmd="ffmpeg -y -i \"$prores_file\" -map 0:a -map 0:v -c:a aac -b:a 129k -c:v hevc_videotoolbox -b:v 4885k -colorspace bt709 -color_primaries bt709 -color_trc bt709 -vtag hvc1 -movflags +faststart \"$hevc_output\""
+    echo "Command: $cmd"
+    echo ""
+
+    ffmpeg -y -i "$prores_file" \
+        -c:v hevc_videotoolbox \
+        -pix_fmt bgra \
+        -alpha_quality 1 \
+        -tag:v hvc1 \
+        "$hevc_output"
+fi
+
+if [ $? -eq 0 ] && [ -f "$hevc_output" ]; then
+    echo ""
+    echo "✓ SUCCESS: HEVC conversion complete!"
+    ls -lh "$hevc_output"
+
+    # Verify the output file isn't corrupted
+    echo ""
+    echo "=== Verifying Output File Integrity ==="
+    verify_result=$(ffprobe -v error -select_streams v:0 -count_frames -show_entries stream=nb_frames -of csv=p=0 "$hevc_output" 2>&1)
+    if echo "$verify_result" | grep -q "error\|corrupt\|invalid"; then
+        echo "✗ WARNING: Output file may be corrupted"
+        echo "Verification result: $verify_result"
+    else
+        echo "✓ Output file integrity verified"
+        echo "Frame count: $verify_result"
+    fi
+
+    # Show file size comparison
+    output_size=$(stat -f%z "$hevc_output" 2>/dev/null || stat -c%s "$hevc_output" 2>/dev/null)
+    if [ ! -z "$input_size" ] && [ ! -z "$output_size" ]; then
+        ratio=$(awk "BEGIN {printf \"%.1f\", $output_size/$input_size}")
+        compression=$(awk "BEGIN {printf \"%.1f\", $input_size/$output_size}")
+        echo ""
+        echo "=== File Size Comparison ==="
+        echo "ProRes 4444: $(awk "BEGIN {printf \"%.1f\", $input_size/1024/1024}")MB"
+        echo "HEVC Alpha:  $(awk "BEGIN {printf \"%.1f\", $output_size/1024/1024}")MB"
+        echo "Size ratio:  ${ratio}x (${compression}x compression)"
+    fi
+
+    echo ""
+    echo "=== Output File Analysis ==="
+    echo "HEVC file properties:"
+    ffprobe -v quiet -select_streams v:0 -show_entries stream=codec_name,pix_fmt,width,height,bit_rate -of csv=p=0 "$hevc_output"
+
+    # HEVC embeds alpha natively - visual verification required
+    echo "✓ HEVC file created (alpha embedded natively - verify visually)"
+
+    echo ""
+    echo "✓ TEST COMPLETE: $hevc_output created successfully!"
+    echo "✓ Open the file in Safari or QuickTime to verify alpha transparency works!"
+
+else
+    echo ""
+    echo "✗ FAILED: HEVC conversion failed"
+
+    # Try alternative approach if VideoToolbox failed
+    if [ "$use_software" = false ]; then
+        echo ""
+        echo "Trying software encoder as fallback..."
+
+        ffmpeg -y -i "$prores_file" \
+            -map 0:a -map 0:v \
+            -c:a aac -b:a 129k \
+            -c:v libx265 \
+            -b:v 4885k \
+            -preset medium \
+            -colorspace bt709 \
+            -color_primaries bt709 \
+            -color_trc bt709 \
+            -movflags +faststart \
+            "${base_name}_hevc_sw.mov"
+
+        if [ $? -eq 0 ]; then
+            echo "✓ SUCCESS with software encoder: ${base_name}_hevc_sw.mov"
+        else
+            echo "✗ Both hardware and software encoders failed"
+            exit 1
+        fi
+    else
+        exit 1
+    fi
+fi