--- title: Video Upload Checklist description: BigMarker account allows you to preload video content directly to your webinar --- [Skip to content](https://kb.bigmarker.com/knowledge/video-upload-checklist#main-content) English Show submenu for translations [![Size=36px, Style=On-light, Brand=BigMarker-1](https://kb.bigmarker.com/hs-fs/hubfs/Size=36px%2c%20Style=On-light%2c%20Brand=BigMarker-1.png?width=171&height=36&name=Size=36px%2c%20Style=On-light%2c%20Brand=BigMarker-1.png)](https://www.bigmarker.com/) Open main navigation Close main navigation - English Show submenu for translations Welcome to the BigMarker Knowledge Base! - There are no suggestions because the search field is empty. 1. [Knowledge Base](https://kb.bigmarker.com/knowledge?hsLang=en) 2. [Presenter Capabilities](https://kb.bigmarker.com/knowledge/presenter-capabilities?hsLang=en) 3. [Content & Engagement](https://kb.bigmarker.com/knowledge/presenter-capabilities?hsLang=en#content-engagement) # Video Upload Checklist ## BigMarker account allows you to preload video content directly to your webinar If you run into questions while [pre-loading your video content](https://kb.bigmarker.com/knowledge/how-to-pre-load-content-to-virtual-events-webinars?hsLang=en), here are some tips for troubleshooting that you can do yourself:  **1. Is my video file in the correct format?**  BigMarker requires all videos be in .mp4 format for uploading. We highly recommend encoding your videos in **h264**. Our system will convert h265 codec, but if the video is larger and/or you preload or upload it close to the webinar's start time, the processing might not fully finish. You may get a corrupt video warning and notification as well.  **2. Is my video file over 4 gigabytes? ** BigMarker allows videos up to 4 GB (or 4000 megabytes) to be uploaded into the preload or automation section of the webinar. *Yes? * Send the file through a file compressor and set the codec to h.264 setting with a lower bitrate. These size of files **MUST be preloaded**. **3. Is my bitrate too high?** One of the most common misconceptions about rendering your video content is that the bigger the bitrate the better the video. The truth is, while it is optimal to have a higher bitrate for HD video, most of the time the extra bytes of data just take up a lot more space than they need to on your computer. Bigger files also take much longer to upload. The ideal video sizes and bitrates: **720p:** 3500kbps, or about 1.6GB per hour video **1080p**: 8mbps, about 3.6GB per hour video **4. Is my video link to Vimeo, Youtube or another streaming website?**  BigMarker currently only supports MP4 files, and MP4 links. YouTube recently updating the video security polices which impacts the method in which BigMarker delivers YouTube content during the webinar. Since the policy may impact Youtube videos in your webinar without warning,  **we highly recommend replacing any YouTube links you have already preloaded and only using MP4 files or MP4 links now and in the future**. 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