The /audio/waveform Robot
We offer a variety of features to reduce audio size while maintaining quality, as well as add effects like loops or watermarks.
The /audio/waveform Robot generates waveform images for your audio files and allows you to change their colors and dimensions.
||(required) String / Array of Strings / Object||
GeneralSpecifies which Step(s) to use as our input.
Special Step namesA special Step name is
Providing several Steps as inputYou can add arrays to
That's likely all you need to know about
› Advanced use cases
Step bundlingSome Robots can gather several Step results for a single invocation. For example, the /file/compress Robot would normally create one archive for each file passed to it. If you'd set
This is also a crucial parameter for the /video/adaptive Robot, otherwise you'll generate 1 playlist for each viewing quality.
Keep in mind that all input Steps must be present in your Template. If one of them is missing (for instance it is rejected by a filter), no result is generated because the Robot waits indefinitely for all input Steps to be finished. Here's a demo that showcases Step bundling.
Group by originalSticking with the /file/compress Robot example, you can set
FieldsYou can be more discriminatory by only using files that match a field name by setting the
Use AsSometimes Robots take several inputs. For instance, the /video/merge Robot can create a slideshow from audio and images. You can map different Steps to the appropriate inputs. Example:
Sometimes the ordering is important, for instance, with our concat Robots. In these cases, you can add an index that starts at 1. You can also optionally filter by the multipart field name. Like in this example, where all files are coming from the same source (end-user uploads), but with different
For times when it is not apparent where we should put the file, you can use Assembly Variables to be specific. For instance, you may want to pass a text file to the /image/resize Robot to burn the text in an image, but you are burning multiple texts, so where do we put the text file? We use specify it via
||The format of the result file. Can be
||The width of the resulting image if the format
||The height of the resulting image if the format
||The background color of the resulting image in the "rrggbbaa" format (red, green, blue, alpha), if the format
||The color used in the center of the gradient. The format is "rrggbbaa" (red, green, blue, alpha).|
||The color used in the outer parts of the gradient. The format is "rrggbbaa" (red, green, blue, alpha).|
Our /audio/waveform Robot can be used in combination with other Robots, to create powerful workflows unique to your use case. Here are a few example scenarios that you can try live on our website:
Transloadit is a SaaS with a subscription model.
Our /audio/waveform Robot counts towards your plan's data at a normal rate. It charges at minimum 1MB whenever it is used. Assuming the Startup Plan and an average audio file size of 3.8MB, you could generate 8192 audio files for $49/month.
Just like with your mobile plan, pricing goes down considerably when you commit to larger monthly volumes. You can adjust this every month. More info and available plans on our Pricing page.
Blog posts about the /audio/waveform Robot
We wrote the following posts about the /audio/waveform Robot on our blog: