120 lines
3 KiB
Nix
120 lines
3 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.programs.custom.ffmpeg;
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ffmpegTemplate = name:
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{ profile, preset, tune ? null }:
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pkgs.writeShellScriptBin "ffmpeg-${name}" ''
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if [ $# -eq 0 ]
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then
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cat <<EOF
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ffmpeg-<profile>-<preset>-<tunes>-720p <input> <output>
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profiles =
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"baseline" - Primarily for low-cost applications that require additional data loss robustness
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"main" - This profile is used for standard-definition digital TV broadcasts that use the MPEG-4 format as defined in the DVB standard.
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"high" - The primary profile for broadcast and disc storage applications, particularly for high-definition television applications
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presets =
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"ultrafast"
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"superfast"
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"veryfast"
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"faster"
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"fast"
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"medium"
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"slow"
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"slower"
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"veryslow"
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tunes = (optional)
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"film" - use for high quality movie content; lowers deblockin
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"animation" - good for cartoons; uses higher deblocking and more reference frames
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"grain" - preserves the grain structure in old, grainy film material
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"stillimage" - good for slideshow-like content
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"fastdecode" - allows faster decoding by disabling certain filters
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EOF
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exit 0
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fi
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if [ $# -ne 2 ]
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then
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echo "ffmpeg-${name} <input> <output>"
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exit 1
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fi
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input=$1
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output=$2
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if [ ! -f "$input" ]
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then
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echo "input does not exist $input"
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exit 1
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fi
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# do it stereo
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# -ac 2
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# do it sample rate 44100
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# -ar 44100
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exec ${pkgs.ffmpeg}/bin/ffmpeg \
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-i "$input" \
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-filter:v scale=h='min(720\,ih)':w='min(1280\,iw)' \
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-vcodec libx264 \
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-preset ${preset} \
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-profile:v ${profile} \
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${optionalString (tune != null) "-tune ${tune}"} \
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-acodec aac \
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-ac 2 \
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-ar 44100 \
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"$output" \
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-hide_banner
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'';
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ffmpegDescriptive = profile: preset:
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ffmpegTemplate "${profile}-${preset}-720p" { inherit profile preset; };
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ffmpegDescriptiveTune = profile: preset: tune:
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ffmpegTemplate "${profile}-${preset}-${tune}-720p" {
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inherit profile preset tune;
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};
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# https://en.wikipedia.org/wiki/H.264/MPEG-4_AVC#Profiles
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profiles = [
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"baseline"
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"main"
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"high"
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#"high10"
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#"high422"
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#"high44"
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];
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presets = [
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#"ultrafast"
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#"superfast"
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#"veryfast"
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#"faster"
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"fast"
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"medium"
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"slow"
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#"slower"
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"veryslow"
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];
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tunes = [ "film" "animation" "grain" "stillimage" "fastdecode" ];
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ffmpegs = lib.crossLists ffmpegDescriptive [ profiles presets ];
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ffmpegsTune = lib.crossLists ffmpegDescriptiveTune [ profiles presets tunes ];
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in {
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options.programs.custom.ffmpeg = {
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enable = mkEnableOption "enable programs.custom.ffmpeg";
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};
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config =
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mkIf cfg.enable { environment.systemPackages = ffmpegs ++ ffmpegsTune; };
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}
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