Specifications for Proxy Videos and Encoding Posted on: 04/02/2015 3:36 pm under Solutions Closed Captioning Encode Specifications Offline Captioning Proxy Specifications ... Does your video require offline captioning? Since the new FCC Caption Quality Best Practices went into effect on March 16, any video asset that is prerecorded is now required to have prerecorded captioning, with some exceptions. VITAC provides offline captioning and encoding services. If you need a caption or subtitle file that you’re going to upload and/or encode yourself, check out these proxy video specifications. If captions or subtitles need to be encoded to your video, make sure to look over our encoded video specifications. This sheet includes our most popular service of late, adding captions to broadcast quality digital video and uploading direct to stations. For more information, visit our customer corner section on our website or contact us with any questions.