ContributionsMost RecentMost LikesSolutionsRe: Webinar registrant blocked by Mimecast Hi AshC , Many thanks for your guidance. We'll try running our next event as a webcast. Re: MP4 video audio not heard by some attendees Thanks Chris Droessler. In some instances, attendees have connected using the phone but not all. Do you have any recommendations for how the MP4 is produced which might avoid this issue? We use Camtasia so there are various options for encoding but I'm not sure if these would address this issue? Many thanks. MP4 video audio not heard by some attendees Hi, We have a recurring issue where some of our webinar delegates have reported that they can't hear our shared videos. In all cases, we've been told the live webinar audio is ok, but some attendees lose the sound as soon as we play the uploaded MP4 video. They can see the recording ok but don't hear any audio. For the majority these recordings play ok, but it's a poor experience for the others. I'd welcome any guidance for how we can prevent this issue happening again. Many thanks. Solved