Definition
A codec balances file size, quality, and compute: a better codec fits more quality into a smaller file but usually costs more processing power. Delivery codecs (H.264, H.265/HEVC, AV1, VP9) use inter-frame ('Long-GOP') compression, storing only what changes between keyframes — tiny files, but harder to scrub and edit. Editing codecs (ProRes, DNxHR) use intra-frame compression, storing every frame as a complete image — large files, but smooth to edit and visually lossless. The key confusion to avoid: MP4/MOV/WebM are containers (the box), while the codec is the compression method inside. H.264 is the safe compatibility default; H.265 and AV1 are more efficient for 4K and streaming; ProRes/DNxHR are for editing and mastering, not upload.
How Loopdesk Uses This
Loopdesk uses WebCodecs to decode whatever codec your source arrives in — H.264 from a camera, HEVC from an iPhone, AV1 from a download — and to hardware-encode your export in the browser. Platform export presets apply the right codec, container, resolution, and bitrate per destination, so you pick 'YouTube' or 'TikTok,' not a codec profile.
Never pick a codec profile again
Loopdesk decodes any source codec and exports publish-ready files per platform in the browser — you pick the destination.
Try LoopdeskFrequently Asked Questions
Is MP4 a codec?
No. MP4 is a container that holds compressed video, audio, and metadata. The codec is the compression inside — usually H.264, but possibly H.265 or AV1. Two MP4 files can use completely different codecs.
What codec should I use for YouTube?
H.264 in an MP4 is the safe, maximum-compatibility choice. For 4K with smaller files, use H.265/HEVC or AV1. YouTube re-encodes uploads, so send a high-quality file at the recommended bitrate.
Related Keywords
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Related Terms
Bitrate
How much data a video uses per second (measured in Mbps); higher bitrate means better quality and larger files.
Frame Rate (fps)
The number of still frames a video shows each second (fps); it controls motion smoothness and 'feel', not sharpness.
4K Export
Exporting video at 3840×2160 resolution (4K UHD), the current professional standard for high-quality video content across YouTube, streaming platforms, and broadcast.
Export Presets
Pre-configured export settings optimized for specific platforms (YouTube, TikTok, Instagram, etc.) including resolution, aspect ratio, bitrate, and format.
WebCodecs
A web API that provides low-level access to the browser's built-in video and audio codecs, enabling near-native-speed video encoding and decoding directly in the browser.