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npx remotion render

Render a video or audio based on the entry point, the composition ID and save it to the output location.

bash
npx remotion render <entry-point|serve-url>? <composition-id> <output-location>
bash
npx remotion render <entry-point|serve-url>? <composition-id> <output-location>

You may pass a Serve URL or an entry point as the first argument, otherwise the entry point will be determined.

If composition-id is not passed, Remotion will ask you to select a composition.
If output-location is not passed, the media will be rendered into the out folder.

Flags​

Besides choosing a video and output location with the command line arguments, the following flags are supported:

--props​

React Props to pass to the selected composition of your video. Must be a serialized JSON string (--props='{"hello": "world"}') or a path to a JSON file (./path/to/props.json). Can also be read using getInputProps().

info

Inline JSON string isn't supported on Windows because it removes the " character, use a temporary file instead.

--heightv3.2.40​

Overrides composition height.

--widthv3.2.40​

Overrides composition width.

--concurrency​

How many CPU threads to use. Minimum 1. The maximum is the amount of threads you have (In Node.JS os.cpus().length). You can also provide a percentage value (e.g. 50%).

--pixel-format​

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

--image-formatv1.4.0​

jpeg or png - JPEG is faster, but doesn't support transparency. The default image format is jpeg since v1.1.

--configv1.2.0​

Specify a location for the Remotion config file.

--env-filev2.2.0​

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

--jpeg-qualityv4.0.0​

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

--qualityv1.4.0​

Renamed to --jpeg-quality in v4.0.0

--output v4.0.0​

Sets the output file path, as an alternative to the output-location positional argument.

--overwrite​

Write to output even if file already exists.. This flag is enabled by default, use --overwrite=false to disable it.

--sequencev1.4.0​

Pass this flag if you want an image sequence as the output instead of a video.

--codecv1.4.0​

h264 or h265 or png or vp8 or vp9 or mp3 or aac or wav or prores or h264-mkv. If you don't supply --codec, it will use the H.264 encoder.

--audio-codecv3.3.42​

Set the format of the audio that is embedded in the video. Not all codec and audio codec combinations are supported and certain combinations require a certain file extension and container format. See the table in the docs to see possible combinations.

--audio-bitratev3.2.32​

Specify the target bitrate for the generated video. The syntax for FFmpeg's -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: 512K for 512 kbps, 1M for 1 Mbps. Default: 320k

--video-bitratev3.2.32​

Specify the target bitrate for the generated video. The syntax for FFmpeg's-b:v parameter should be used. FFmpeg may encode the video in a way that will not result in the exact video bitrate specified. Example values: 512K for 512 kbps, 1M for 1 Mbps.

--buffer-sizev4.0.78​

The value for the -bufsize flag of FFmpeg. Should be used in conjunction with the encoding max rate flag.

--max-ratev4.0.78​

The value for the -maxrate flag of FFmpeg. Should be used in conjunction with the encoding buffer size flag.

--prores-profilev2.1.6​

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.

--x264-presetv4.2.2​

Sets a x264 preset profile. Only applies to videos rendered with h264 codec.
Possible values: superfast, veryfast, faster, fast, medium, slow, slower, veryslow, placebo.
Default: medium

--crfv1.4.0​

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. This option cannot be set if --video-bitrate is set.

--browser-executablev1.5.0​

Path to a Chrome executable. If not specified and Remotion cannot find one, it will download one during rendering.

--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. scale must be greater than 0 and less than equal to 16. Default: 1.

--framesv2.0.0​

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-framev3.1.0​

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.

--mutedv3.2.1​

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

--enforce-audio-trackv3.2.1​

Render a silent audio track if there wouldn't be one otherwise..

--number-of-gif-loopsv3.1.0​

Allows you to set the number of loops as follows:
  • null (or omitting in the CLI) plays the GIF indefinitely.
  • 0 disables looping
  • 1 loops the GIF once (plays twice in total)
  • 2 loops the GIF twice (plays three times in total) and so on.

--bundle-cachev2.0.0​

Enable or disable Webpack caching. This flag is enabled by default, use --bundle-cache=false to disable caching.

--log​

Set the log level. Increase or decrease the amount of output. Acceptable values: error, warn, info (default), verbose

--port​

Set a custom HTTP server port that will be used to host the Webpack bundle. If not defined, Remotion will try to find a free port.

--public-dirv3.2.13​

The path of the URL where the bundle is going to be hosted. By default it is /, meaning that the bundle is going to be hosted at the root of the domain (e.g. https://localhost:3000/). If you are deploying to a subdirectory (e.g. /sites/my-site/), you should set this to the subdirectory.

--timeout​

Define how long a single frame may take to resolve all delayRender() calls before it times out in milliseconds. Default: 30000.

info

Not to be confused with the --timeout flag when deploying a Lambda function.

--ignore-certificate-errorsv2.6.5​

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

--disable-web-securityv2.6.5​

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

--disable-headlessv2.6.5​

Opens an actual browser during rendering to observe the render.

--gl​

Changelog
  • From Remotion v2.6.7 until v3.0.7, the default for Remotion Lambda was swiftshader, but from v3.0.8 the default is swangle (Swiftshader on Angle) since Chrome 101 added support for it.
  • From Remotion v2.4.3 until v2.6.6, the default was angle, however it turns out to have a small memory leak that could crash long Remotion renders.

Select the OpenGL renderer backend for Chromium.
Accepted values:

  • "angle"
  • "egl"
  • "swiftshader"
  • "swangle"
  • "vulkan" (from Remotion v4.0.41)
  • "angle-egl" (from Remotion v4.0.51)

The default is null, letting Chrome decide, except on Lambda where the default is "swangle"

--user-agentv3.3.83​

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

--offthreadvideo-cache-size-in-bytesv4.0.23​

From v4.0, Remotion has a cache for <OffthreadVideo> frames. The default is null, corresponding to half of the system memory available when the render starts.
This option allows to override the size of the cache. The higher it is, the faster the render will be, but the more memory will be used.
The used value will be printed when running in verbose mode.
Default: null

--color-spacev4.0.28​

Color space to use for the video. Acceptable values: "default", "bt709" (since v4.0.28), "bt2020-ncl" (since v4.0.88), "bt2020-cl" (since v4.0.88), .
If a non-default colorspace is used, it is recommended to also use "png" as the image format to have accurate color transformations throughout. Only since v4.0.83, colorspace conversion is actually performed, previously it would only tag the metadata of the video.

--enable-multiprocess-on-linuxv4.0.42​

Removes the --single-process flag that gets passed to Chromium on Linux by default. This will make the render faster because multiple processes can be used, but may cause issues with some Linux distributions or if window server libraries are missing.
Default: false until v4.0.136, then true from v4.0.137 on because newer Chrome versions don't allow rendering with the --single-process flag.
This flag will be removed in Remotion v5.0.

--reprov4.0.88​

Create a ZIP that you can submit to Remotion if asked for a reproduction.

--binaries-directoryv4.0.120​

The directory where the platform-specific binaries and libraries that Remotion needs are located. Those include an ffmpeg and ffprobe binary, a Rust binary for various tasks, and various shared libraries. If the value is set to null, which is the default, then the path of a platform-specific package located at node_modules/@remotion/compositor-* is selected.
This option is useful in environments where Remotion is not officially supported to run like bundled serverless functions or Electron.

--for-seamless-aac-concatenationv4.0.123​

If enabled, the audio is trimmed to the nearest AAC frame, which is required for seamless concatenation of AAC files. This is a requirement if you later want to combine multiple video snippets seamlessly.

This option is used internally. There is currently no documentation yet for to concatenate the audio chunks.

--separate-audio-tov4.0.123​

If set, the audio will not be included in the main output but rendered as a separate file at the location you pass. It is recommended to use an absolute path. If a relative path is passed, it is relative to the Remotion Root.

--ffmpeg-executable​

removed in v4.0

Set a custom ffmpeg executable. If not defined, a ffmpeg executable will be searched in PATH.

--ffprobe-executable v3.0.17​

removed in v4.0

Set a custom ffprobe executable. If not defined, a ffprobe executable will be searched in PATH.