only use vaapi when feature is enabled

[skip ci] no need

.forgejo/workflows/webhook.yml

@@ -2,6 +2,7 @@ name: Trigger quay.io Webhook
 
 on:
   push:
+    branches: [main]
 
 jobs:
   run:

Cargo.toml

@@ -24,3 +24,4 @@ toml = { package = "basic-toml", version = "0.1.4" }
 [features]
 default = ["mem_limit"]
 mem_limit = []
+vaapi = []

README.md

@@ -0,0 +1,17 @@
+**ACHTUNG!** This repository might be mirrored at different places, but the main repository is and remains at [msrd0.dev/msrd0/render_video](https://msrd0.dev/msrd0/render_video). Please redirect all issues and pull requests there.
+
+# render_video
+
+This "script" is an extremely fancy wrapper around ffmpeg to cut/render videos for the [VideoAG](https://video.fsmpi.rwth-aachen.de) of the [Fachschaft I/1 der RWTH Aachen University](https://fsmpi.rwth-aachen.de).
+
+You can find a ready-to-use docker image at [`quay.io/msrd0/render_video`](https://quay.io/msrd0/render_video).
+
+## Features
+
+ - **Extract a single audio channel from stereo recording.** We use that with one of our cameras that supports plugging a lavalier microphone (mono source) into one channel of the stereo recording, and using the camera microphone (mono source) for the other channel of the stereo recording.
+ - **Cut away before/after the lecture.** We don't hit the start record button the exact time that the lecture starts, and don't hit the stop button exactly when the lecture ends, so we need to cut away those unwanted bits.
+ - **Fast-forward through _Tafelwischpausen_.** Sometimes docents still use blackboards and need to wipe those, which can be fast-forwarded by this tool.
+ - **Overlay questions from the audience.** Sometimes people in the audience have questions, and those are usually poorly understood on the lavalier microphones. Therefore you can subtitle these using the other microphones in the room that don't make it into the final video and have those overlayed.
+ - **Add intro and outro.** We add intro and outro slides at the start/end at all lectures, which this tool can do for you.
+ - **Add our logo watermark.** We add a logo watermark in the bottom right corner of all videos, which this tool can do for you.
+ - **Rescale to lower resolutions.** We usually published videos at different resolutions, and this tool can rescale your video for all resolutions you want.

src/cli.rs

@@ -0,0 +1,54 @@
+//! This module contains helper functions for implementing CLI/TUI.
+
+use crate::time::{parse_time, Time};
+use console::style;
+use std::{
+	fmt::Display,
+	io::{self, BufRead as _, Write as _}
+};
+
+pub fn ask(question: impl Display) -> String {
+	let mut stdout = io::stdout().lock();
+	let mut stdin = io::stdin().lock();
+
+	write!(
+		stdout,
+		"{} {} ",
+		style(question).bold().magenta(),
+		style(">").cyan()
+	)
+	.unwrap();
+	stdout.flush().unwrap();
+	let mut line = String::new();
+	stdin.read_line(&mut line).unwrap();
+	line.trim().to_owned()
+}
+
+pub fn ask_time(question: impl Display + Copy) -> Time {
+	let mut stdout = io::stdout().lock();
+	let mut stdin = io::stdin().lock();
+
+	let mut line = String::new();
+	loop {
+		line.clear();
+		write!(
+			stdout,
+			"{} {} ",
+			style(question).bold().magenta(),
+			style(">").cyan()
+		)
+		.unwrap();
+		stdout.flush().unwrap();
+		stdin.read_line(&mut line).unwrap();
+		let line = line.trim();
+		match parse_time(line) {
+			Ok(time) => return time,
+			Err(err) => writeln!(
+				stdout,
+				"{} {line:?}: {err}",
+				style("Invalid Input").bold().red()
+			)
+			.unwrap()
+		}
+	}
+}

src/iotro.rs

@@ -1,6 +1,9 @@
 //! A module for writing intros and outros
 
-use crate::{time::Date, ProjectLecture, Resolution};
+use crate::{
+	project::{ProjectLecture, Resolution},
+	time::Date
+};
 use anyhow::anyhow;
 use std::{
 	fmt::{self, Debug, Display, Formatter},

src/lib.rs

@@ -0,0 +1,17 @@
+#![allow(clippy::manual_range_contains)]
+#![warn(clippy::unreadable_literal, rust_2018_idioms)]
+#![forbid(elided_lifetimes_in_paths, unsafe_code)]
+
+pub mod cli;
+pub mod iotro;
+pub mod preset;
+pub mod project;
+pub mod question;
+pub mod render;
+pub mod time;
+
+#[cfg(feature = "mem_limit")]
+use std::sync::RwLock;
+
+#[cfg(feature = "mem_limit")]
+pub static MEM_LIMIT: RwLock<String> = RwLock::new(String::new());

src/main.rs

@@ -2,32 +2,17 @@
 #![warn(clippy::unreadable_literal, rust_2018_idioms)]
 #![forbid(elided_lifetimes_in_paths, unsafe_code)]
 
-mod iotro;
-mod preset;
-mod project;
-mod question;
-mod render;
-mod time;
-
-use self::{
-	project::{Project, ProjectLecture, ProjectSource, Resolution},
-	render::Renderer,
-	time::{parse_date, parse_time, Time}
-};
-use crate::preset::Preset;
 use camino::Utf8PathBuf as PathBuf;
 use clap::Parser;
 use console::style;
-#[cfg(feature = "mem_limit")]
-use std::sync::RwLock;
-use std::{
-	fmt::Display,
-	fs,
-	io::{self, BufRead as _, Write}
+use render_video::{
+	cli::{ask, ask_time},
+	preset::Preset,
+	project::{Project, ProjectLecture, ProjectSource, Resolution},
+	render::Renderer,
+	time::parse_date
 };
-
-#[cfg(feature = "mem_limit")]
-static MEM_LIMIT: RwLock<String> = RwLock::new(String::new());
+use std::fs;
 
 #[derive(Debug, Parser)]
 struct Args {
@@ -60,58 +45,12 @@ struct Args {
 	stereo: bool
 }
 
-fn ask(question: impl Display) -> String {
-	let mut stdout = io::stdout().lock();
-	let mut stdin = io::stdin().lock();
-
-	write!(
-		stdout,
-		"{} {} ",
-		style(question).bold().magenta(),
-		style(">").cyan()
-	)
-	.unwrap();
-	stdout.flush().unwrap();
-	let mut line = String::new();
-	stdin.read_line(&mut line).unwrap();
-	line.trim().to_owned()
-}
-
-fn ask_time(question: impl Display + Copy) -> Time {
-	let mut stdout = io::stdout().lock();
-	let mut stdin = io::stdin().lock();
-
-	let mut line = String::new();
-	loop {
-		line.clear();
-		write!(
-			stdout,
-			"{} {} ",
-			style(question).bold().magenta(),
-			style(">").cyan()
-		)
-		.unwrap();
-		stdout.flush().unwrap();
-		stdin.read_line(&mut line).unwrap();
-		let line = line.trim();
-		match parse_time(line) {
-			Ok(time) => return time,
-			Err(err) => writeln!(
-				stdout,
-				"{} {line:?}: {err}",
-				style("Invalid Input").bold().red()
-			)
-			.unwrap()
-		}
-	}
-}
-
 fn main() {
 	let args = Args::parse();
 
 	#[cfg(feature = "mem_limit")]
 	{
-		*(MEM_LIMIT.write().unwrap()) = args.mem_limit;
+		*(render_video::MEM_LIMIT.write().unwrap()) = args.mem_limit;
 	}
 
 	// process arguments
@@ -135,7 +74,8 @@ fn main() {
 			let lower = name.to_ascii_lowercase();
 			if (lower.ends_with(".mp4")
 				|| lower.ends_with(".mts")
-				|| lower.ends_with(".mkv"))
+				|| lower.ends_with(".mkv")
+				|| lower.ends_with(".mov"))
 				&& !entry.file_type().unwrap().is_dir()
 			{
 				files.push(String::from(name));
@@ -182,7 +122,7 @@ fn main() {
 		project
 	};
 
-	let renderer = Renderer::new(&directory, &project).unwrap();
+	let mut renderer = Renderer::new(&directory, &project).unwrap();
 	let recording = renderer.recording_mkv();
 
 	// preprocess the video
@@ -275,7 +215,7 @@ fn main() {
 
 	// rescale the video
 	if let Some(lowest_res) = args.transcode.or(preset.transcode) {
-		for res in Resolution::values().into_iter().rev() {
+		for res in Resolution::STANDARD_RESOLUTIONS.into_iter().rev() {
 			if res > project.source.metadata.as_ref().unwrap().source_res
 				|| res > args.transcode_start.unwrap_or(preset.transcode_start)
 				|| res < lowest_res

src/preset.rs

@@ -11,57 +11,59 @@ use std::{fs, io};
 
 #[serde_as]
 #[derive(Deserialize, Serialize)]
-pub(crate) struct Preset {
+pub struct Preset {
 	// options for the intro slide
-	pub(crate) course: String,
-	pub(crate) label: String,
-	pub(crate) docent: String,
+	pub course: String,
+	pub label: String,
+	pub docent: String,
 
 	/// Course language
-	#[serde(default = "Default::default")]
+	#[serde(default)]
 	#[serde_as(as = "DisplayFromStr")]
-	pub(crate) lang: Language<'static>,
+	pub lang: Language<'static>,
 
 	// coding options
-	pub(crate) transcode_start: Resolution,
-	pub(crate) transcode: Option<Resolution>
+	#[serde_as(as = "DisplayFromStr")]
+	pub transcode_start: Resolution,
+	#[serde_as(as = "Option<DisplayFromStr>")]
+	pub transcode: Option<Resolution>
 }
 
-fn preset_23ws_malo2() -> Preset {
+pub fn preset_23ws_malo2() -> Preset {
 	Preset {
 		course: "23ws-malo2".into(),
 		label: "Mathematische Logik II".into(),
 		docent: "Prof. E. Grädel".into(),
 		lang: GERMAN,
-		transcode_start: Resolution::WQHD,
-		transcode: Some(Resolution::nHD)
+		transcode_start: "1440p".parse().unwrap(),
+		transcode: Some("360p".parse().unwrap())
 	}
 }
 
-fn preset_24ss_algomod() -> Preset {
+pub fn preset_24ss_algomod() -> Preset {
 	Preset {
 		course: "24ss-algomod".into(),
 		label: "Algorithmische Modelltheorie".into(),
 		docent: "Prof. E. Grädel".into(),
 		lang: GERMAN,
-		transcode_start: Resolution::WQHD,
-		transcode: Some(Resolution::HD)
+		transcode_start: "1440p".parse().unwrap(),
+		transcode: Some("720p".parse().unwrap())
 	}
 }
 
-fn preset_24ss_qc() -> Preset {
+pub fn preset_24ss_qc() -> Preset {
 	Preset {
 		course: "24ss-qc".into(),
 		label: "Introduction to Quantum Computing".into(),
 		docent: "Prof. D. Unruh".into(),
 		lang: BRITISH,
-		transcode_start: Resolution::WQHD,
-		transcode: Some(Resolution::HD)
+		transcode_start: "1440p".parse().unwrap(),
+		transcode: Some("720p".parse().unwrap())
 	}
 }
 
 impl Preset {
-	pub(crate) fn find(name: &str) -> anyhow::Result<Self> {
+	pub fn find(name: &str) -> anyhow::Result<Self> {
 		match fs::read(name) {
 			Ok(buf) => return Ok(toml::from_slice(&buf)?),
 			Err(err) if err.kind() == io::ErrorKind::NotFound => {},

src/project.rs

@@ -8,157 +8,199 @@ use crate::{
 use rational::Rational;
 use serde::{Deserialize, Serialize};
 use serde_with::{serde_as, DisplayFromStr};
-use std::{collections::BTreeSet, str::FromStr};
+use std::{
+	cmp,
+	collections::BTreeSet,
+	fmt::{self, Display, Formatter},
+	str::FromStr
+};
 
-macro_rules! resolutions {
-	($($res:ident: $width:literal x $height:literal at $bitrate:literal in $format:ident),+) => {
-		#[allow(non_camel_case_types, clippy::upper_case_acronyms)]
-		#[derive(Clone, Copy, Debug, Deserialize, Eq, Ord, PartialEq, PartialOrd, Serialize)]
-		pub(crate) enum Resolution {
-			$(
-				#[doc = concat!(stringify!($width), "x", stringify!($height))]
-				$res
-			),+
+#[derive(Clone, Copy, Debug, Deserialize, Serialize)]
+pub struct Resolution(u32, u32);
+
+impl Resolution {
+	pub fn new(width: u32, height: u32) -> Self {
+		Self(width, height)
+	}
+
+	pub fn width(self) -> u32 {
+		self.0
+	}
+
+	pub fn height(self) -> u32 {
+		self.1
+	}
+
+	pub(crate) fn bitrate(self) -> u64 {
+		// 640 * 360: 500k
+		if self.width() <= 640 {
+			500_000
 		}
-
-		const NUM_RESOLUTIONS: usize = {
-			let mut num = 0;
-			$(num += 1; stringify!($res);)+
-			num
-		};
-
-		impl Resolution {
-			pub(crate) fn values() -> [Self; NUM_RESOLUTIONS] {
-				[$(Self::$res),+]
-			}
-
-			pub(crate) fn width(self) -> usize {
-				match self {
-					$(Self::$res => $width),+
-				}
-			}
-
-			pub(crate) fn height(self) -> usize {
-				match self {
-					$(Self::$res => $height),+
-				}
-			}
-
-			pub(crate) fn bitrate(self) -> u64 {
-				match self {
-					$(Self::$res => $bitrate),+
-				}
-			}
-
-			pub(crate) fn format(self) -> FfmpegOutputFormat {
-				match self {
-					$(Self::$res => FfmpegOutputFormat::$format),+
-				}
-			}
+		// 1280 * 720: 1M
+		else if self.width() <= 1280 {
+			1_000_000
 		}
-
-		impl FromStr for Resolution {
-			type Err = anyhow::Error;
-
-			fn from_str(s: &str) -> anyhow::Result<Self> {
-				Ok(match s {
-					$(concat!(stringify!($height), "p") => Self::$res,)+
-					_ => anyhow::bail!("Unknown Resolution: {s:?}")
-				})
-			}
+		// 1920 * 1080: 2M
+		else if self.width() <= 1920 {
+			2_000_000
 		}
+		// 2560 * 1440: 3M
+		else if self.width() <= 2560 {
+			3_000_000
+		}
+		// 3840 * 2160: 4M
+		// TODO die bitrate von 4M ist absolut an den haaren herbeigezogen
+		else if self.width() <= 3840 {
+			4_000_000
+		}
+		// we'll cap everything else at 5M for no apparent reason
+		else {
+			5_000_000
+		}
+	}
+
+	pub(crate) fn default_codec(self) -> FfmpegOutputFormat {
+		if self.width() > 1920 {
+			FfmpegOutputFormat::Av1Opus
+		} else {
+			FfmpegOutputFormat::AvcAac
+		}
+	}
+
+	pub const STANDARD_RESOLUTIONS: [Self; 5] = [
+		Self(640, 360),
+		Self(1280, 720),
+		Self(1920, 1080),
+		Self(2560, 1440),
+		Self(3840, 2160)
+	];
+}
+
+impl Display for Resolution {
+	fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+		write!(f, "{}p", self.height())
 	}
 }
 
-resolutions! {
-	nHD: 640 x 360 at 500_000 in AvcAac,
-	HD: 1280 x 720 at 1_000_000 in AvcAac,
-	FullHD: 1920 x 1080 at 750_000 in Av1Opus,
-	WQHD: 2560 x 1440 at 1_000_000 in Av1Opus,
-	// TODO qsx muss mal sagen wieviel bitrate für 4k
-	UHD: 3840 x 2160 at 2_000_000 in Av1Opus
+impl FromStr for Resolution {
+	type Err = anyhow::Error;
+
+	fn from_str(s: &str) -> anyhow::Result<Self> {
+		Ok(match s.to_lowercase().as_str() {
+			"360p" | "nhd" => Self(640, 360),
+			"540p" | "qhd" => Self(960, 540),
+			"720p" | "hd" => Self(1280, 720),
+			"900p" | "hd+" => Self(1600, 900),
+			"1080p" | "fhd" | "fullhd" => Self(1920, 1080),
+			"1440p" | "wqhd" => Self(2560, 1440),
+			"2160p" | "4k" | "uhd" => Self(3840, 2160),
+			_ => anyhow::bail!("Unknown Resolution: {s:?}")
+		})
+	}
 }
 
-#[derive(Deserialize, Serialize)]
-pub(crate) struct Project {
-	pub(crate) lecture: ProjectLecture,
-	pub(crate) source: ProjectSource,
-	pub(crate) progress: ProjectProgress
+impl Ord for Resolution {
+	fn cmp(&self, other: &Self) -> cmp::Ordering {
+		(self.0 * self.1).cmp(&(other.0 * other.1))
+	}
+}
+
+impl Eq for Resolution {}
+
+impl PartialOrd for Resolution {
+	fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
+		Some(self.cmp(other))
+	}
+}
+
+impl PartialEq for Resolution {
+	fn eq(&self, other: &Self) -> bool {
+		self.cmp(other) == cmp::Ordering::Equal
+	}
+}
+
+#[derive(Debug, Deserialize, Serialize)]
+pub struct Project {
+	pub lecture: ProjectLecture,
+	pub source: ProjectSource,
+	pub progress: ProjectProgress
 }
 
 #[serde_as]
-#[derive(Deserialize, Serialize)]
-pub(crate) struct ProjectLecture {
-	pub(crate) course: String,
-	pub(crate) label: String,
-	pub(crate) docent: String,
+#[derive(Debug, Deserialize, Serialize)]
+pub struct ProjectLecture {
+	pub course: String,
+	pub label: String,
+	pub docent: String,
 	#[serde_as(as = "DisplayFromStr")]
-	pub(crate) date: Date,
+	pub date: Date,
 	#[serde(default = "Default::default")]
 	#[serde_as(as = "DisplayFromStr")]
-	pub(crate) lang: Language<'static>
+	pub lang: Language<'static>
 }
 
 #[serde_as]
-#[derive(Deserialize, Serialize)]
-pub(crate) struct ProjectSource {
-	pub(crate) files: Vec<String>,
-	pub(crate) stereo: bool,
+#[derive(Debug, Deserialize, Serialize)]
+pub struct ProjectSource {
+	pub files: Vec<String>,
+	pub stereo: bool,
 
 	#[serde_as(as = "Option<DisplayFromStr>")]
-	pub(crate) start: Option<Time>,
+	pub start: Option<Time>,
 	#[serde_as(as = "Option<DisplayFromStr>")]
-	pub(crate) end: Option<Time>,
+	pub end: Option<Time>,
 
 	#[serde(default)]
 	#[serde_as(as = "Vec<(DisplayFromStr, DisplayFromStr)>")]
-	pub(crate) fast: Vec<(Time, Time)>,
+	pub fast: Vec<(Time, Time)>,
 
 	#[serde(default)]
 	#[serde_as(as = "Vec<(DisplayFromStr, DisplayFromStr, _)>")]
-	pub(crate) questions: Vec<(Time, Time, String)>,
+	pub questions: Vec<(Time, Time, String)>,
 
-	pub(crate) metadata: Option<ProjectSourceMetadata>
+	pub metadata: Option<ProjectSourceMetadata>
 }
 
 #[serde_as]
-#[derive(Deserialize, Serialize)]
-pub(crate) struct ProjectSourceMetadata {
+#[derive(Debug, Deserialize, Serialize)]
+pub struct ProjectSourceMetadata {
 	/// The duration of the source video.
 	#[serde_as(as = "DisplayFromStr")]
-	pub(crate) source_duration: Time,
+	pub source_duration: Time,
 	/// The FPS of the source video.
 	#[serde_as(as = "DisplayFromStr")]
-	pub(crate) source_fps: Rational,
+	pub source_fps: Rational,
 	/// The time base of the source video.
 	#[serde_as(as = "DisplayFromStr")]
-	pub(crate) source_tbn: Rational,
+	pub source_tbn: Rational,
 	/// The resolution of the source video.
-	pub(crate) source_res: Resolution,
+	pub source_res: Resolution,
 	/// The sample rate of the source audio.
-	pub(crate) source_sample_rate: u32
+	pub source_sample_rate: u32
 }
 
-#[derive(Default, Deserialize, Serialize)]
-pub(crate) struct ProjectProgress {
+#[serde_as]
+#[derive(Debug, Default, Deserialize, Serialize)]
+pub struct ProjectProgress {
 	#[serde(default)]
-	pub(crate) preprocessed: bool,
+	pub preprocessed: bool,
 
 	#[serde(default)]
-	pub(crate) asked_start_end: bool,
+	pub asked_start_end: bool,
 
 	#[serde(default)]
-	pub(crate) asked_fast: bool,
+	pub asked_fast: bool,
 
 	#[serde(default)]
-	pub(crate) asked_questions: bool,
+	pub asked_questions: bool,
 
 	#[serde(default)]
-	pub(crate) rendered_assets: bool,
+	pub rendered_assets: bool,
 
 	#[serde(default)]
-	pub(crate) rendered: bool,
+	pub rendered: bool,
 
+	#[serde_as(as = "BTreeSet<DisplayFromStr>")]
 	#[serde(default)]
-	pub(crate) transcoded: BTreeSet<Resolution>
+	pub transcoded: BTreeSet<Resolution>
 }

src/question.rs

@@ -1,4 +1,4 @@
-use crate::{iotro::Language, Resolution};
+use crate::{iotro::Language, project::Resolution};
 use fontconfig::Fontconfig;
 use harfbuzz_rs::{Face, Font, Owned, UnicodeBuffer};
 use std::sync::OnceLock;

src/render/ffmpeg.rs

@@ -1,8 +1,8 @@
 use super::{cmd, filter::Filter};
 use crate::{
+	project::Resolution,
 	render::filter::channel,
-	time::{format_time, Time},
-	Resolution
+	time::{format_time, Time}
 };
 use anyhow::bail;
 use camino::Utf8PathBuf as PathBuf;
@@ -41,8 +41,8 @@ impl FfmpegInput {
 			cmd.arg("-r").arg(fps.to_string());
 		}
 		if let Some(start) = self.start {
-			if self.path.ends_with(".mp4") {
-				cmd.arg("-seek_streams_individualy").arg("false");
+			if self.path.ends_with(".mp4") || self.path.ends_with(".mov") {
+				cmd.arg("-seek_streams_individually").arg("false");
 			}
 			cmd.arg("-ss").arg(format_time(start));
 		}
@@ -59,12 +59,30 @@ pub(crate) enum FfmpegOutputFormat {
 	Av1Flac,
 	/// AV1 / OPUS
 	Av1Opus,
+	/// AVC (H.264) / FLAC
+	AvcFlac,
 	/// AVC (H.264) / AAC
 	AvcAac
 }
 
+impl FfmpegOutputFormat {
+	pub(crate) fn with_flac_audio(self) -> Self {
+		match self {
+			Self::Av1Flac | Self::AvcFlac => self,
+			Self::Av1Opus => Self::Av1Flac,
+			Self::AvcAac => Self::AvcFlac
+		}
+	}
+}
+
+pub(crate) enum FfmpegOutputQuality {
+	Default,
+	VisuallyLossless
+}
+
 pub(crate) struct FfmpegOutput {
 	pub(crate) format: FfmpegOutputFormat,
+	pub(crate) quality: FfmpegOutputQuality,
 	pub(crate) audio_bitrate: Option<u64>,
 	pub(crate) video_bitrate: Option<u64>,
 
@@ -89,6 +107,7 @@ impl FfmpegOutput {
 	pub(crate) fn new(format: FfmpegOutputFormat, path: PathBuf) -> Self {
 		Self {
 			format,
+			quality: FfmpegOutputQuality::Default,
 			audio_bitrate: None,
 			video_bitrate: None,
 
@@ -118,41 +137,48 @@ impl FfmpegOutput {
 	}
 
 	fn append_to_cmd(self, cmd: &mut Command, venc: bool, _aenc: bool, vaapi: bool) {
-		// select codec and bitrate
-		const QUALITY: &str = "18";
+		// select codec and bitrate/crf
 		if venc {
 			let vcodec = match (self.format, vaapi) {
 				(FfmpegOutputFormat::Av1Flac, false)
 				| (FfmpegOutputFormat::Av1Opus, false) => "libsvtav1",
 				(FfmpegOutputFormat::Av1Flac, true)
 				| (FfmpegOutputFormat::Av1Opus, true) => "av1_vaapi",
-				(FfmpegOutputFormat::AvcAac, false) => "h264",
-				(FfmpegOutputFormat::AvcAac, true) => "h264_vaapi"
+				(FfmpegOutputFormat::AvcAac, false)
+				| (FfmpegOutputFormat::AvcFlac, false) => "h264",
+				(FfmpegOutputFormat::AvcAac, true)
+				| (FfmpegOutputFormat::AvcFlac, true) => "h264_vaapi"
 			};
 			cmd.arg("-c:v").arg(vcodec);
 
 			if vcodec == "libsvtav1" {
 				cmd.arg("-svtav1-params").arg("fast-decode=1");
-				cmd.arg("-preset").arg("8");
-			}
-
-			match self.video_bitrate {
-				Some(bv) if vcodec != "libsvtav1" => {
-					cmd.arg("-b:v").arg(bv.to_string());
-				},
-				None if vaapi => {
-					cmd.arg("-rc_mode").arg("CQP");
-					cmd.arg("-global_quality").arg(QUALITY);
-				},
-				_ => {
-					cmd.arg("-crf").arg(QUALITY);
+				cmd.arg("-preset").arg("7");
+				cmd.arg("-crf").arg(match self.quality {
+					FfmpegOutputQuality::Default => "28",
+					FfmpegOutputQuality::VisuallyLossless => "18"
+				});
+			} else if vcodec == "h264" {
+				match self.quality {
+					FfmpegOutputQuality::Default => {
+						cmd.arg("-preset").arg("slow");
+						cmd.arg("-crf").arg("21");
+					},
+					FfmpegOutputQuality::VisuallyLossless => {
+						// the quality is not impacted by speed, only the bitrate, and
+						// for this setting we don't really care about bitrate
+						cmd.arg("-preset").arg("veryfast");
+						cmd.arg("-crf").arg("17");
+					}
 				}
+			} else if let Some(bv) = self.video_bitrate {
+				cmd.arg("-b:v").arg(bv.to_string());
 			}
 		} else {
 			cmd.arg("-c:v").arg("copy");
 		}
 		cmd.arg("-c:a").arg(match self.format {
-			FfmpegOutputFormat::Av1Flac => "flac",
+			FfmpegOutputFormat::Av1Flac | FfmpegOutputFormat::AvcFlac => "flac",
 			FfmpegOutputFormat::Av1Opus => "libopus",
 			FfmpegOutputFormat::AvcAac => "aac"
 		});
@@ -296,7 +322,7 @@ impl Ffmpeg {
 
 		// initialise a vaapi device if one exists
 		let vaapi_device: PathBuf = "/dev/dri/renderD128".into();
-		let vaapi = vaapi_device.exists();
+		let vaapi = cfg!(feature = "vaapi") && vaapi_device.exists();
 		if vaapi && venc {
 			if vdec {
 				cmd.arg("-hwaccel").arg("vaapi");

src/render/mod.rs

@@ -15,6 +15,7 @@ use crate::{
 use anyhow::{bail, Context};
 use camino::{Utf8Path as Path, Utf8PathBuf as PathBuf};
 use console::style;
+use ffmpeg::FfmpegOutputQuality;
 use std::{
 	borrow::Cow,
 	collections::VecDeque,
@@ -41,8 +42,8 @@ const QUESTION_FADE_LEN: Time = Time {
 };
 const FF_MULTIPLIER: usize = 8;
 // logo sizes at full hd, will be scaled to source resolution
-const FF_LOGO_SIZE: usize = 128;
-const LOGO_SIZE: usize = 96;
+const FF_LOGO_SIZE: u32 = 128;
+const LOGO_SIZE: u32 = 96;
 
 fn cmd() -> Command {
 	#[cfg(feature = "mem_limit")]
@@ -119,7 +120,7 @@ fn ffprobe_audio(query: &str, concat_input: &Path) -> anyhow::Result<String> {
 	)
 }
 
-pub(crate) struct Renderer<'a> {
+pub struct Renderer<'a> {
 	/// The directory with all the sources.
 	directory: &'a Path,
 
@@ -139,6 +140,7 @@ fn svg2mkv(
 	duration: Time
 ) -> anyhow::Result<()> {
 	let mut ffmpeg = Ffmpeg::new(FfmpegOutput {
+		quality: FfmpegOutputQuality::VisuallyLossless,
 		duration: Some(duration),
 		time_base: Some(meta.source_tbn),
 		fps_mode_vfr: true,
@@ -157,7 +159,7 @@ fn svg2mkv(
 	ffmpeg.run()
 }
 
-fn svg2png(svg: &Path, png: &Path, width: usize, height: usize) -> anyhow::Result<()> {
+fn svg2png(svg: &Path, png: &Path, width: u32, height: u32) -> anyhow::Result<()> {
 	let mut cmd = cmd();
 	cmd.arg("inkscape")
 		.arg("-w")
@@ -175,7 +177,7 @@ fn svg2png(svg: &Path, png: &Path, width: usize, height: usize) -> anyhow::Resul
 }
 
 impl<'a> Renderer<'a> {
-	pub(crate) fn new(directory: &'a Path, project: &Project) -> anyhow::Result<Self> {
+	pub fn new(directory: &'a Path, project: &Project) -> anyhow::Result<Self> {
 		let slug = format!(
 			"{}-{}",
 			project.lecture.course,
@@ -184,23 +186,21 @@ impl<'a> Renderer<'a> {
 		let target = directory.join(&slug);
 		fs::create_dir_all(&target)?;
 
-		let first: PathBuf = directory.join(
-			project
-				.source
-				.files
-				.first()
-				.context("No source files present")?
-		);
-		let height: u32 = ffprobe_video("stream=height", &first)?
-			.split('\n')
-			.next()
-			.unwrap()
-			.parse()?;
-		let format = if height <= 1080 {
-			FfmpegOutputFormat::AvcAac
-		} else {
-			FfmpegOutputFormat::Av1Flac
-		};
+		// Ensure we have at least one input file.
+		project
+			.source
+			.files
+			.first()
+			.context("No source files present")?;
+
+		// In case we don't have a resolution yet, we'll asign this after preprocessing.
+		let format = project
+			.source
+			.metadata
+			.as_ref()
+			.map(|meta| meta.source_res.default_codec())
+			.unwrap_or(FfmpegOutputFormat::Av1Flac)
+			.with_flac_audio();
 
 		Ok(Self {
 			directory,
@@ -210,7 +210,7 @@ impl<'a> Renderer<'a> {
 		})
 	}
 
-	pub(crate) fn recording_mkv(&self) -> PathBuf {
+	pub fn recording_mkv(&self) -> PathBuf {
 		self.target.join("recording.mkv")
 	}
 
@@ -230,7 +230,7 @@ impl<'a> Renderer<'a> {
 		self.target.join(format!("question{q_idx}.png"))
 	}
 
-	pub(crate) fn preprocess(&self, project: &mut Project) -> anyhow::Result<()> {
+	pub fn preprocess(&mut self, project: &mut Project) -> anyhow::Result<()> {
 		assert!(!project.progress.preprocessed);
 
 		let recording_txt = self.target.join("recording.txt");
@@ -263,14 +263,7 @@ impl<'a> Renderer<'a> {
 
 		let width = ffprobe_video("stream=width", &recording_mkv)?.parse()?;
 		let height = ffprobe_video("stream=height", &recording_mkv)?.parse()?;
-		let source_res = match (width, height) {
-			(3840, 2160) => Resolution::UHD,
-			(2560, 1440) => Resolution::WQHD,
-			(1920, 1080) => Resolution::FullHD,
-			(1280, 720) => Resolution::HD,
-			(640, 360) => Resolution::nHD,
-			(width, height) => bail!("Unknown resolution: {width}x{height}")
-		};
+		let source_res = Resolution::new(width, height);
 		project.source.metadata = Some(ProjectSourceMetadata {
 			source_duration: ffprobe_video("format=duration", &recording_mkv)?.parse()?,
 			source_fps: ffprobe_video("stream=r_frame_rate", &recording_mkv)?.parse()?,
@@ -278,12 +271,13 @@ impl<'a> Renderer<'a> {
 			source_res,
 			source_sample_rate
 		});
+		self.format = source_res.default_codec().with_flac_audio();
 
 		Ok(())
 	}
 
 	/// Prepare assets like intro, outro and questions.
-	pub(crate) fn render_assets(&self, project: &Project) -> anyhow::Result<()> {
+	pub fn render_assets(&self, project: &Project) -> anyhow::Result<()> {
 		let metadata = project.source.metadata.as_ref().unwrap();
 
 		println!();
@@ -365,8 +359,8 @@ impl<'a> Renderer<'a> {
 
 	/// Get the video file for a specific resolution, completely finished.
 	fn video_file_res(&self, res: Resolution) -> PathBuf {
-		let extension = match res.format() {
-			FfmpegOutputFormat::Av1Flac => "mkv",
+		let extension = match res.default_codec() {
+			FfmpegOutputFormat::Av1Flac | FfmpegOutputFormat::AvcFlac => "mkv",
 			FfmpegOutputFormat::Av1Opus => "webm",
 			FfmpegOutputFormat::AvcAac => "mp4"
 		};
@@ -375,15 +369,16 @@ impl<'a> Renderer<'a> {
 	}
 
 	/// Get the video file directly outputed to further transcode.
-	pub(crate) fn video_file_output(&self) -> PathBuf {
+	pub fn video_file_output(&self) -> PathBuf {
 		self.target.join(format!("{}.mkv", self.slug))
 	}
 
-	pub(crate) fn render(&self, project: &mut Project) -> anyhow::Result<PathBuf> {
+	pub fn render(&self, project: &mut Project) -> anyhow::Result<PathBuf> {
 		let source_res = project.source.metadata.as_ref().unwrap().source_res;
 
 		let output = self.video_file_output();
 		let mut ffmpeg = Ffmpeg::new(FfmpegOutput {
+			quality: FfmpegOutputQuality::VisuallyLossless,
 			video_bitrate: Some(source_res.bitrate() * 3),
 			..FfmpegOutput::new(self.format, output.clone())
 		});
@@ -675,7 +670,7 @@ impl<'a> Renderer<'a> {
 			comment: Some(lecture.lang.video_created_by_us.into()),
 			language: Some(lecture.lang.lang.into()),
 
-			..FfmpegOutput::new(res.format(), output.clone()).enable_faststart()
+			..FfmpegOutput::new(res.default_codec(), output.clone()).enable_faststart()
 		});
 		ffmpeg.add_input(FfmpegInput::new(input));
 		ffmpeg.rescale_video(res);