Codecs

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October, 2021

  • 4 October

    Basic YouTube-DL Commands to Download Files from YouTube

    This article describes what youtube-dl is, and outlines several basic youtube-dl commands for audio/video/subtitle downloads. I’ve always been fascinated with how YouTube encodes the endless hours of videos uploaded to the site. YouTube employs the best and the brightest and their task is positively Sisyphean. For years, I’ve gotten a …

September, 2021

  • 26 September

    Which Codec Does YouTube Use, Part III

    This article analyzes the codecs used by YouTube for 4K videos with millions of views, and the savings that AV1 and VP9 deliver over YouTube’s full encoding ladder.  This is the third in a series of articles written about which codecs YouTube uses. The first covers which codecs YouTube uses …

  • 10 September

    Which Codec Does YouTube Use, Part Deux

    YouTube encodes some videos using the AV1 and VP9 codecs. This post identifies the H.264 versions also created by YouTube for devices incompatible with VP9/AV1 for 1080p and larger videos.  In a recent post, I explored which codecs YouTube used for videos ranging from a few hundred views to a …

August, 2021

  • 26 August

    Which Codecs Does YouTube Use?

    This article reviews which codecs YouTube uses for the unrelenting torrent of videos that it ingests and encodes. The data suggest that AV1 is only worthwhile for videos with view counts in the mid-to-high millions, but VP9 is worth considering for view counts in excess of a few thousand.  As …

  • 1 August

    Beginner’s Guide to Encoding H.264

    Encoding H.264 with Wirecast

    The H.264 codec is still the most widely used video compression technology — aka codec in the world and likely will be for the next few years. For this reason, every streaming media professional should know what the H.264 codec is and how to encode with H.264. This beginner’s guide …

July, 2021

  • 26 July

    AV1 Codec: AOMedia Video 1 Explained

    This article on the Wowza website provides a quick overview of the AV1 codec: what it is, how it performs, what it costs, and what it’s good for today. It’s useful if you want to get a quick feel for where AV1 fits in with other codecs. The article is …

  • 11 July

    H.265 Codec: High Efficiency Video Coding (HEVC) Explained

    This article on the Wowza website provides a quick overview of the HEVC codec: what it is, how it performs, what it costs, and what it’s good for. It concludes with a section on what you need to know to effectively deploy the HEVC codec using the Wowza Streaming Engine …

June, 2021

  • 30 June

    VP9 Codec: Google’s Open-Source Technology Explained

    This article on the Wowza website provides a quick overview of the VP9 codec: what it is, how it performs, what it costs, and what it’s good for. It concludes with a section on where you should consider deploying VP9 and what you need to know to effectively deploy the …

  • 29 June

    H.264 Codec Backgrounder

    This article on the Wowza website provides a quick overview of the H.264 codec: what it is, how it performs, what it costs, and what it’s good for. It concludes with a section on what you need to know to effectively deploy the H.264 codec, particularly within the Wowza Streaming …

  • 25 June

    Real-World Bandwidth Savings from VP9, HEVC, and AV1

    This article is about a video lesson that computes the bandwidths savings afforded by the FFmpeg-based implementations of VP9 (libvpx-VP9), H.264 (x264), HEVC (x265), and AV1 (libaom-AV1). The lesson uses the Netflix convex hull analysis to build unique encoding ladders for each test clip and codec and shows why BD-Rate …