Definition
A codec balances file size, fidelity, and processing cost. Delivery codecs such as H.264, HEVC, AV1, and VP9 commonly use inter-frame prediction: they encode predictions plus residual information, not just changed pixels, and some also offer intra-only modes. Editing codecs such as ProRes and DNxHR encode frames independently, often making editing easier at the cost of larger files. They are generally lossy; 'visually lossless' is a quality description, not mathematical losslessness. H.264 is widely supported. HEVC and AV1 can be more efficient, but savings depend on content, encoder, settings, and the quality comparison. AV1 is designed for royalty-free use, not universal device compatibility. MP4, MOV, and WebM are containers, and valid codec/container combinations still need player support. Choose delivery or editing formats based on the recipient's requirements; an editing codec is not automatically unsuitable for upload.
How Loopdesk Uses This
For a browser-based Loopdesk workflow, confirm the currently supported source and export formats. WebCodecs does not promise every codec or hardware acceleration: support depends on codec profile, bit depth, browser, operating system, hardware, and the application's implementation. Decode support does not imply encode support. Test a representative source and export before relying on a preset.
Choose an export that fits your destination
Check Loopdesk's currently supported source and export formats, use an appropriate preset where available, and preview the resulting file on the intended 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 a broadly compatible starting point. HEVC, AV1, or a high-quality editing codec can be alternatives when your encoder and YouTube's current upload guidance support the chosen format. YouTube re-encodes uploads, so export a clean source and follow current delivery guidance rather than assuming a particular codec always yields smaller or better results.
Related Keywords
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Related Terms
Bitrate
The amount of encoded video data per second, often measured in Mbps; it influences compression quality and, with duration, file size.
Frame Rate (fps)
The number of video frames captured, encoded, or displayed per second (fps), affecting motion cadence and the options for slow motion.
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.