617 — Mp4

: Some users have reported significantly slower download speeds when requesting the 617 format compared to other high-definition streams like itag 399 [28].

In the context of YouTube's internal format identifiers (itags), is a specific MP4 video format code. Format Details Video Format : MP4 (H.264/AVC) [26]. 617 mp4

: These "Premium" or high-bitrate itags (like 616 and 617) are part of YouTube's efforts to provide enhanced quality for certain viewers or devices [26, 30]. : Some users have reported significantly slower download

: Users of yt-dlp and similar tools may see this ID when listing available formats for a video [18]. 617 mp4