npx remotion lambda render

Using the npx remotion lambda render command, you can render a video in the cloud.

The structure of a command is as follows:

npx remotion lambda render <serve-url> [<composition-id>] [<output-location>]

npx remotion lambda render <serve-url> [<composition-id>] [<output-location>]

• The serve URL is obtained by deploying a Remotion project to an AWS S3 bucket using the sites create command or calling deploySite().
• The composition ID. If not specified, the list of compositions will be fetched and you can choose a composition.
• The output-location parameter is optional. If you don't specify it, the video is stored in your S3 bucket. If you specify a location, it gets downloaded to your device in an additional step.

Example commands

Rendering a video:

npx remotion lambda render https://remotionlambda-abcdef.s3.eu-central-1.amazonaws.com/sites/testbed/index.html my-comp

npx remotion lambda render https://remotionlambda-abcdef.s3.eu-central-1.amazonaws.com/sites/testbed/index.html my-comp

Rendering a video and saving it to out/video.mp4:

npx remotion lambda render https://remotionlambda-abcdef.s3.eu-central-1.amazonaws.com/sites/testbed/index.html my-comp out/video.mp4

npx remotion lambda render https://remotionlambda-abcdef.s3.eu-central-1.amazonaws.com/sites/testbed/index.html my-comp out/video.mp4

Using the shorthand serve URL:

npx remotion lambda render testbed my-comp

npx remotion lambda render testbed my-comp

Passing in input props:

npx remotion lambda render --props='{"hi": "there"}' testbed my-comp

npx remotion lambda render --props='{"hi": "there"}' testbed my-comp

Printing debug information including a CloudWatch link:

npx remotion lambda render --log=verbose testbed my-comp

npx remotion lambda render --log=verbose testbed my-comp

Keeping the output video private:

npx remotion lambda render --privacy=private testbed my-comp

npx remotion lambda render --privacy=private testbed my-comp

Rendering only the audio:

npx remotion lambda render --codec=mp3 testbed my-comp

npx remotion lambda render --codec=mp3 testbed my-comp

Flags

--region

The AWS region to select. Both project and function should be in this region.

--props

React Props to pass to the root component of your video. Must be a serialized JSON string (--props='{"hello": "world"}') or a path to a JSON file (./path/to/props.json).

--log

Log level to be used inside the Lambda function. Also, if you set it to verbose, a link to CloudWatch will be printed where you can inspect logs.

--privacy

One of:

• "public" (default): The rendered media is publicly accessible under the S3 URL.
• "private": The rendered media is not publicly available, but signed links can be created using presignUrl().
• "no-acl" (available from v.3.1.7): The ACL option is not being set at all, this option is useful if you are writing to another bucket that does not support ACL using outName.

--max-retries

How many times a single chunk is being retried if it fails to render. Default 1.

--frames-per-lambda

How many frames should be rendered in a single Lambda function. Increase it to require less Lambda functions to render the video, decrease it to make the render faster.

Default value: Dependant on video length
Minimum value: 4

note

The framesPerLambda parameter cannot result in more than 200 functions being spawned. See: Concurrency

--concurrency-per-lambda v3.0.30

By default, each Lambda function renders with concurrency 1 (one open browser tab). You may use the option to customize this value.

--quality

Value between 0 and 100 for JPEG rendering quality. Doesn't work when PNG frames are rendered.

--muted v3.2.1

Disables audio output. This option may only be used when rendering a video.

--codec

h264 or h265 or png or vp8 or mp3 or aac or wav or prores. If you don't supply --codec, it will use h264.

--audio-codec v3.3.42

Set which codec the audio should have. For defaults and possible values, refer to the Encoding guide.

--audio-bitrate v3.2.32

Specify the target bitrate for the generated audio.
The syntax for FFMPEGs -b:a parameter should be used.
FFMPEG may encode the video in a way that will not result in the exact audio bitrate specified. Example values: 128K for 128 kbps, 1M for 1 Mbps.
Default: 320k

--video-bitrate v3.2.32

Specify the target bitrate for the generated video.
The syntax for FFMPEGs -b:v parameter should be used.
FFMPEG may encode the video in a way that will not result in the exact video bitrate specified.
This option cannot be set if --crf is set. Example values: 512K for 512 kbps, 1M for 1 Mbps.

--prores-profile

Set the ProRes profile. This option is only valid if the codec has been set to prores. Possible values: 4444-xq, 4444, hq, standard, light, proxy. See here for explanation of possible values. Default: hq.

--crf

To set Constant Rate Factor (CRF) of the output. Minimum 0. Use this rate control mode if you want to keep the best quality and care less about the file size.

--pixel-format

Set a custom pixel format. See here for available values.

--image-format

jpeg or png - JPEG is faster, but doesn't support transparency. The default image format is jpeg.

--scale

Scales the output frames by the factor you pass in. For example, a 1280x720px frame will become a 1920x1080px frame with a scale factor of 1.5. Vector elements like fonts and HTML markups will be rendered with extra details.

--env-file

Specify a location for a dotenv file. Default .env.

--frames

Render a subset of a video. Example: --frames=0-9 to select the first 10 frames. To render a still, use the still command.

--every-nth-frame v3.1.0

Render only every nth frame. This option may only be set when rendering GIFs. This allows you to lower the FPS of the GIF.

For example only every second frame, every third frame and so on. Only works for rendering GIFs. See here for more details.

--number-of-gif-loops v3.1.0

Set the looping behavior. This option may only be set when rendering GIFs. See here for more details.

--out-name

The file name of the media output as stored in the S3 bucket. By default, it is out plus the appropriate file extension, for example: out.mp4. Must match /([0-9a-zA-Z-!_.*'()/]+)/g.

--overwrite v3.2.25

If a custom out name is specified and a file already exists at this key in the S3 bucket, decide whether that file will be deleted before the render begins. Default false.

An existing file at the output S3 key will conflict with the render and must be deleted beforehand. If this setting is false and a conflict occurs, an error will be thrown.

--webhook v3.2.30

Sets a webhook to be called when the render finishes or fails. renderMediaOnLambda() -> webhook.url. To be used together with --webhook-secret.

--webhook-secret v3.2.30

Sets a webhook secret for the webhook (see above). renderMediaOnLambda() -> webhook.secret. To be used together with --webhook.

--height v3.2.40

Overrides composition height.

--width v3.2.40

Overrides composition width.

--function-name v3.3.38

Specify the name of the function which should be used to invoke and orchestrate the render. You only need to pass it if there are multiple functions with different configurations.

--renderer-function-name v3.3.38

If specified, this function will be used for rendering the individual chunks. This is useful if you want to use a function with higher or lower power for rendering the chunks than the main orchestration function.

If you want to use this option, the function must be in the same region, the same account and have the same version as the main function.

--force-bucket-name v3.3.42

Specify a specific bucket name to be used. This is not recommended, instead let Remotion discover the right bucket automatically.

--ignore-certificate-errors

Results in invalid SSL certificates in Chrome, such as self-signed ones, being ignored.

--disable-web-security

This will most notably disable CORS in Chrome among other security features.

--user-agent v3.3.83

Lets you set a custom user agent that the headless Chrome browser assumes.