diff --git a/Cargo.lock b/Cargo.lock
index c891b51..4b3eee7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -873,6 +873,12 @@ dependencies = [
  "either",
 ]
 
+[[package]]
+name = "itoa"
+version = "1.0.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "92ecc6618181def0457392ccd0ee51198e065e016d1d527a7ac1b6dc7c1f09d2"
+
 [[package]]
 name = "jni"
 version = "0.21.1"
@@ -1049,6 +1055,20 @@ dependencies = [
  "paste",
 ]
 
+[[package]]
+name = "mp4"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9ef834d5ed55e494a2ae350220314dc4aacd1c43a9498b00e320e0ea352a5c3"
+dependencies = [
+ "byteorder",
+ "bytes",
+ "num-rational",
+ "serde",
+ "serde_json",
+ "thiserror 1.0.69",
+]
+
 [[package]]
 name = "mp4ra-rust"
 version = "0.3.0"
@@ -1120,6 +1140,37 @@ dependencies = [
  "jni-sys",
 ]
 
+[[package]]
+name = "num-bigint"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a5e44f723f1133c9deac646763579fdb3ac745e418f2a7af9cd0c431da1f20b9"
+dependencies = [
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "num-integer"
+version = "0.1.46"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7969661fd2958a5cb096e56c8e1ad0444ac2bbcd0061bd28660485a44879858f"
+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "num-rational"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f83d14da390562dca69fc84082e73e548e1ad308d24accdedd2720017cb37824"
+dependencies = [
+ "num-bigint",
+ "num-integer",
+ "num-traits",
+ "serde",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.19"
@@ -1741,6 +1792,19 @@ dependencies = [
  "syn 2.0.117",
 ]
 
+[[package]]
+name = "serde_json"
+version = "1.0.149"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fc039473c5595ace860d8c4fafa220ff474b3fc6bfdb4293327f1a37e94d86"
+dependencies = [
+ "itoa",
+ "memchr",
+ "serde",
+ "serde_core",
+ "zmij",
+]
+
 [[package]]
 name = "shlex"
 version = "1.3.0"
@@ -2121,6 +2185,7 @@ version = "0.1.0"
 dependencies = [
  "clap",
  "glam",
+ "mp4",
  "strafesnet_common",
  "strafesnet_graphics",
  "strafesnet_roblox_bot_file",
@@ -2952,3 +3017,9 @@ dependencies = [
  "quote",
  "syn 2.0.117",
 ]
+
+[[package]]
+name = "zmij"
+version = "1.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8848ee67ecc8aedbaf3e4122217aff892639231befc6a1b58d29fff4c2cabaa"
diff --git a/video-encoder/Cargo.toml b/video-encoder/Cargo.toml
index 6e3afc0..4a00eca 100644
--- a/video-encoder/Cargo.toml
+++ b/video-encoder/Cargo.toml
@@ -13,3 +13,4 @@ strafesnet_roblox_bot_file.workspace = true
 strafesnet_snf.workspace = true
 vk-video = "0.2.0"
 clap = { version = "4.5.60", features = ["derive"] }
+mp4 = "0.14.0"
diff --git a/video-encoder/src/encode.rs b/video-encoder/src/encode.rs
index 94526d2..44b2c65 100644
--- a/video-encoder/src/encode.rs
+++ b/video-encoder/src/encode.rs
@@ -1,4 +1,3 @@
-use std::io::Write;
 use std::num::NonZeroU32;
 use std::path::PathBuf;
 use strafesnet_common::session::Time as SessionTime;
@@ -48,7 +47,7 @@ impl EncodeSubcommand{
 			device:self.device,
 			output_file:self.output_file.unwrap_or_else(||{
 				let mut output_file:PathBuf=self.bot.file_stem().unwrap().into();
-				output_file.set_extension("h264");
+				output_file.set_extension("mp4");
 				output_file
 			}),
 			map:self.map,
@@ -73,7 +72,10 @@ enum EncodeError{
 	VideoCreateTextures(vk_video::VulkanEncoderError),
 	VideoEncodeFrame(vk_video::VulkanEncoderError),
 	OutputCreateFile(std::io::Error),
-	OutputWriteFile(std::io::Error),
+	OutputMp4Start(mp4::Error),
+	OutputMp4AddTrack(mp4::Error),
+	OutputMp4WriteSample(mp4::Error),
+	OutputMp4End(mp4::Error),
 }
 
 struct EncodeParams{
@@ -154,9 +156,41 @@ fn encode(params:EncodeParams)->Result<(),EncodeError>{
 		)
 		.map_err(EncodeError::VideoCreateTextures)?;
 
-	let mut output_file = std::fs::File::create(params.output_file)
+	let output_file=std::fs::File::create(params.output_file)
 		.map_err(EncodeError::OutputCreateFile)?;
 
+	let mp4_config=mp4::Mp4Config{
+		major_brand: str::parse("isom").unwrap(),
+		minor_version: 512,
+		compatible_brands: vec![
+			str::parse("isom").unwrap(),
+			str::parse("iso2").unwrap(),
+			str::parse("avc1").unwrap(),
+			str::parse("mp41").unwrap(),
+		],
+		timescale:target_framerate,
+	};
+	let mut mp4=mp4::Mp4Writer::write_start(output_file,&mp4_config)
+		.map_err(EncodeError::OutputMp4Start)?;
+
+	let avc_config=mp4::AvcConfig{
+		width:params.width.get() as u16,
+		height:params.height.get() as u16,
+		// make up some data to prevent this underdeveloped library from crashing
+		seq_param_set:vec![0,0,0,0],
+		pic_param_set:vec![],
+	};
+	let track_config=mp4::TrackConfig{
+		track_type:mp4::TrackType::Video,
+		timescale:target_framerate,
+		language:"eng".to_owned(),
+		media_conf:mp4::MediaConfig::AvcConfig(avc_config),
+	};
+
+	const TRACK_ID:u32=1;
+	mp4.add_track(&track_config)
+		.map_err(EncodeError::OutputMp4AddTrack)?;
+
 	let duration = bot.duration();
 	for i in 0..duration.get()*target_framerate as i64/SessionTime::ONE_SECOND.get() {
 		let time=SessionTime::raw(i*SessionTime::ONE_SECOND.get()/target_framerate as i64);
@@ -171,10 +205,20 @@ fn encode(params:EncodeParams)->Result<(),EncodeError>{
 		let res=unsafe{encoder.encode(frame,false)}
 			.map_err(EncodeError::VideoEncodeFrame)?;
 
-		output_file.write_all(&res.data)
-			.map_err(EncodeError::OutputWriteFile)?;
+		let mp4_sample=mp4::Mp4Sample{
+			start_time:i as u64,
+			duration:1,
+			rendering_offset:0,
+			is_sync:false,
+			bytes:res.data.into(),
+		};
+		mp4.write_sample(TRACK_ID,&mp4_sample)
+			.map_err(EncodeError::OutputMp4WriteSample)?;
 	}
 
+	mp4.write_end()
+		.map_err(EncodeError::OutputMp4End)?;
+
 	Ok(())
 }