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Add custom quality factors and quantizer bitrate mode (#448)

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* Add custom quality factors and quantizer bitrate mode (closes #327)

* Fix quantizer mode fallback and per-frame quantizer edge cases

* Clean up quantizer mode tests

* Quantizer implementation

* Add quality tests

* Improve conversion codec error message, make test more lenient

* Add quantizer support blog post

---------

Co-authored-by: Vanilagy <[email protected]>
This commit is contained in:
Don Carignan
2026-07-30 17:24:59 +02:00
committed by GitHub
co-authored by Vanilagy
parent 1a99b0371d
commit c3df2a24e5
48 changed files with 1372 additions and 371 deletions
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docs/guide/quick-start.md
+21 -21
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@@ -226,12 +226,12 @@ Check out [`EncodedPacketSink`](./media-sinks#encodedpacketsink) for the full do
```ts
import {
Output,
BufferTarget,
Mp4OutputFormat,
CanvasSource,
AudioBufferSource,
QUALITY_HIGH,
BufferTarget,
CanvasSource,
Mp4OutputFormat,
Output,
Quality,
} from 'mediabunny';
// An Output represents a new media file
@@ -243,14 +243,14 @@ const output = new Output({
// Example: add a video track driven by a canvas
const videoSource = new CanvasSource(canvas, {
codec: 'avc',
bitrate: QUALITY_HIGH,
quality: new Quality('high'),
});
output.addVideoTrack(videoSource);
// Example: add an audio track driven by AudioBuffers
const audioSource = new AudioBufferSource({
codec: 'aac',
bitrate: QUALITY_HIGH,
quality: new Quality('high'),
});
output.addAudioTrack(audioSource);
@@ -350,12 +350,12 @@ await uploadComplete;
```ts
import {
Output,
BufferTarget,
WebMOutputFormat,
MediaStreamVideoTrackSource,
MediaStreamAudioTrackSource,
QUALITY_MEDIUM
MediaStreamVideoTrackSource,
Output,
Quality,
WebMOutputFormat,
} from 'mediabunny';
const userMedia = await navigator.mediaDevices.getUserMedia({
@@ -373,7 +373,7 @@ const output = new Output({
if (videoTrack) {
const source = new MediaStreamVideoTrackSource(videoTrack, {
codec: 'vp9',
bitrate: QUALITY_MEDIUM,
quality: new Quality('medium'),
});
output.addVideoTrack(source);
}
@@ -381,7 +381,7 @@ if (videoTrack) {
if (audioTrack) {
const source = new MediaStreamAudioTrackSource(audioTrack, {
codec: 'opus',
bitrate: QUALITY_MEDIUM,
quality: new Quality('medium'),
});
output.addAudioTrack(source);
}
@@ -402,11 +402,11 @@ await output.finalize();
```ts
import {
Output,
WebMOutputFormat,
BufferTarget,
CanvasSource,
QUALITY_MEDIUM,
Output,
Quality,
WebMOutputFormat,
} from 'mediabunny';
const output = new Output({
@@ -420,7 +420,7 @@ const context = canvas.getContext('2d', { alpha: true })!;
const source = new CanvasSource(canvas, {
codec: 'vp9',
bitrate: QUALITY_MEDIUM,
quality: new Quality('medium'),
alpha: 'keep', // => Also encode alpha data
});
output.addVideoTrack(source);
@@ -545,10 +545,10 @@ await conversion.execute();
```ts
import {
Conversion,
Input,
Output,
Conversion,
QUALITY_LOW,
Quality,
} from 'mediabunny';
const input = new Input(...);
@@ -560,11 +560,11 @@ const conversion = await Conversion.init({
tracks: 'primary', // Keep only the first track of each type
video: {
width: 480, // Resize to 480p
bitrate: QUALITY_LOW,
quality: new Quality('low'),
},
audio: {
numberOfChannels: 1, // Resample to mono
bitrate: QUALITY_LOW,
quality: new Quality('low'),
},
trim: {
// Let's keep only the first 60 seconds