# Channel input—MP4 pull input
<a name="input-mp4-pull"></a>

To verify that the input is set up correctly, look at the **Input destinations** section. It shows the locations of the source video. You specified these locations when you created the input:
+ If the channel is set up as a standard channel, you specified two locations.
+ If the channel is set up as a single-pipeline channel, you specified one. 

The format of the location depends on the type of upstream system:
+ For an upstream system that uses HTTP or HTTPS, the location is an HTTP or HTTPS URL. For example:

  **https://203.0.113.31/filler-videos/oceanwaves.mp4**

  **https://203.0.113.52/filler-videos/oceanwaves.mp4**
+ For a file that is stored on Amazon S3, the location is the bucket name and object for the file. For example:

  **s3ssl://amzn-s3-demo-bucket/filler-videos/main/oceanwaves.mp4**

  **s3ssl://amzn-s3-demo-bucket/filler-videos/redundant/oceanwaves.mp4**