A transcoded post is a video that has been encoded into a different format, or re-encoded in the same format at a different bitrate (also known as 'transrating') before uploading it to Danbooru. This is usually done for compatibility reasons, or to reduce the file size so it fits under the file size limit.
Codecs
Danbooru only supports the following file formats and codecs:
Container
Video
Audio
WebM
VP8, VP9, AV1
Vorbis, Opus
MP4
AVC (H.264), HEVC (H.265), VP9, AV1
MP3, AAC, Opus
Furthermore, videos with 10-bit color (aka HDR), and videos with 4:4:4 chroma subsampling are also unsupported.
When uploading a transcoded video, please leave a comment which settings you've used for future reference, and if possible a link to the original file.
External links
FFmpeg - a versatile and powerful command‐line program that decodes, encodes, and transcodes nearly any format.
Handbrake - an open-source GUI program with cross-platform support.
VidCoder - offers an alternate and slightly more simplified user interface for the Handbrake engine, aimed at Windows users.
