diff --git a/src/main.rs b/src/main.rs
index 53df6ea..a0b32e4 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -122,7 +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
diff --git a/src/render/ffmpeg.rs b/src/render/ffmpeg.rs
index 07bca84..8bcc37b 100644
--- a/src/render/ffmpeg.rs
+++ b/src/render/ffmpeg.rs
@@ -59,10 +59,22 @@ 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
@@ -132,8 +144,10 @@ impl FfmpegOutput {
 				| (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);
 
@@ -164,7 +178,7 @@ impl FfmpegOutput {
 			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"
 		});
diff --git a/src/render/mod.rs b/src/render/mod.rs
index 332bea1..d426cf1 100644
--- a/src/render/mod.rs
+++ b/src/render/mod.rs
@@ -140,6 +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,
@@ -185,23 +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,
@@ -231,7 +230,7 @@ impl<'a> Renderer<'a> {
 		self.target.join(format!("question{q_idx}.png"))
 	}
 
-	pub 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");
@@ -272,6 +271,7 @@ impl<'a> Renderer<'a> {
 			source_res,
 			source_sample_rate
 		});
+		self.format = source_res.default_codec().with_flac_audio();
 
 		Ok(())
 	}
@@ -360,7 +360,7 @@ 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.default_codec() {
-			FfmpegOutputFormat::Av1Flac => "mkv",
+			FfmpegOutputFormat::Av1Flac | FfmpegOutputFormat::AvcFlac => "mkv",
 			FfmpegOutputFormat::Av1Opus => "webm",
 			FfmpegOutputFormat::AvcAac => "mp4"
 		};