lionel_ffmpeg_encode_v1.sh

#!/bin/bash

input_file="$1"
basename=$(basename "$input_file" | sed 's/\.[^.]*$//')  # remove extension
timestamp=$(date +%H%M%S)
output_file="${basename}_${timestamp}.mp4"

ffmpeg \
    -i "$input_file" \
    -c:v libx264 \                             # best H.264 encoder
    -b:v 2.8M \                                # leave ~200k for audio inside 3M total
    -maxrate 2.8M \                            # cap peak video bitrate
    -bufsize 5.6M \                            # 2x buffer for stable rate control
    -preset veryslow \                         # best compression (if time allows)
    -profile:v high \                          # advanced compression tools
    -level 4.1 \                               # max device compatibility (up to 1080p60)
    -crf 18 \                                  # visually lossless baseline, tightens quality
    -pix_fmt yuv420p \                         # 8-bit 4:2:0 → widest playback support
    -c:a aac \                                 # AAC → best balance of quality + compatibility
    -b:a 192k \                                # cap audio at 192 kbps (best quality allowed)
    -ac 2 \                                    # ensure stereo output (no extra channels)
    "$output_file"