~/.bashrc or ~/.zshrc

alias record='function _record() {
    local display=$(echo $DISPLAY)
    local screen="0"
    local fps=60
    local output_dir="$HOME/Recordings"
    local timestamp=$(date +%Y%m%d_%H%M%S)
    local extra_opts=""
    local audio_opts=""
    local custom_output=""
 
    while [[ $# -gt 0 ]]; do
        case "$1" in
            --s1) screen="0" ;;
            --s2) screen="1" ;;
            --fps)
                fps="$2"
                shift
                ;;
            --nvenc)
                extra_opts="-c:v h264_nvenc -preset llhq -rc vbr_hq -cq 19 -b:v 30M -maxrate:v 60M"
                ;;
            --audio)
                audio_opts="-f pulse -ac 2 -i default"
                ;;
            --output)
                custom_output="$2"
                shift
                ;;
            *)
                echo "Unknown option: $1"
                return 1
                ;;
        esac
        shift
    done
 
    if [ -z "$custom_output" ]; then
        custom_output="$output_dir/screen_${screen}_${timestamp}.mp4"
    fi
 
    local video_opts="-f x11grab -s 2560x1440 -r $fps -i $display.$screen"
    local encode_opts="${extra_opts:--c:v libx264 -preset ultrafast -crf 18 -pix_fmt yuv420p} -c:a aac"
 
    local command="ffmpeg $video_opts $audio_opts $encode_opts $custom_output"
 
    echo "Executing: $command"
    eval "$command"
}; _record'

Screen Recording Alias Usage Guide

This guide explains how to use the record alias for screen recording on Pop!_OS using FFmpeg.

Basic Usage

To start recording your primary screen with default settings:

 record

This will record Screen 1 (0) at 60 fps using x264 encoding.

Options

Selecting Screen

--s1: Record Screen 1 (default)
--s2: Record Screen 2

Example:

 record --s2

Setting Frame Rate

Use --fps followed by the desired frame rate:

 record --fps 30

Using NVIDIA Hardware Encoding

To use NVIDIA's NVENC encoder (if supported):

 record --nvenc

Combining Options

You can combine multiple options:

 record --s2 --fps 75 --nvenc

This will record Screen 2 at 75 fps using NVIDIA hardware encoding.

Output

Recordings are saved in the ~/Recordings directory with filenames in the format:

 screen_[screen number]_[timestamp].mp4

Example: screen_0_20240829_143000.mp4

Notes

The default resolution is set to 2560x1440. To change this, you'll need to modify the alias.
If you encounter performance issues, try lowering the frame rate or using the --nvenc option if you have an NVIDIA GPU.
To stop the recording, press Ctrl+C in the terminal.

Remember to source your .bashrc file or restart your terminal after adding the alias.

This format should work well for MDX files, with the code blocks properly escaped as you requested. Is there anything else you'd like me to adjust in the guide?

Convert Each Video Frame to Individual Photo CLI