When preparing to upload a video to Vidyard, there isn't necessarily a "best format" to deliver your video in. Each file type comes with its own pros and cons when it comes to how you encode your video. The encoder is incredibly robust and will encode pretty much anything you give it. That said, there are a few things to consider when uploading a video to Vidyard.
The first thing is to consider the file size. Naturally, the higher quality the file, the larger the file size will be. Ideally, this should not be a limiting factor when you are encoding your source. A higher bitrate video file will always look better than a lower bitrate file at the expense of having a larger file size. It's better to not limit your bitrate only for the sake of reducing the file size if you can avoid it. If you can afford the bandwidth to upload a large file, set your bitrate to be as high as you can. That said, a 5GB file will take a lot longer to upload and subsequently encode than a 500MB file, so use your best judgement.
The best way to preserve the quality of your videos is to upload a source file that has the same or higher resolution than what you think you'll need. Most video editing software packages have encoding pre-sets that you can use to output large HD videos, or smaller video intended for mobile devices. These pre-sets generally work well with Vidyard and can be used safely.
Vidyard recommends uploading H.264 files to ensure minimal disruption during the encoding process. Video files in other formats can include multiple video and audio tracks that are not recognized by the encoder.
We also recommend encoding to a constant frame rate before uploading to Vidyard. Videos with variable frame rates often run into playback issues. It's also a good idea to apply a deinterlace filter if your file has been interlaced.
You might also want to checkout our articles on Converting GoToMeeting and GoToWebinar Recordings for Vidyard Upload and Converting WebEx Recordings for Vidyard Upload.