[Перезалив] Digital Video at : Progress In Video Codecs

ВК больше не разрешает вставлять видео с ютуба, пришлось своровать. Оригинальное описание: This video compares what different video codecs over the years are capable of encoding in , or 1x CD-ROM speed which is equivalent to 150kB/s. Codecs included in the comparison include YUV 4:1:0, Cinepak, Microsoft Video 1, MJPEG, Sorenson Video, MPEG-1, MPEG-2, MPEG-4 (ASP), (AVC), (HEVC), VP8, VP9 and AV1 with frame dimensions and frame rates chosen to best meet the target bitrate. Output is scaled up to 1920x1080@30fps using a nearest neighbour algorithm to preserve sharp edges. Note that this is not necessarily an apples-to-apples nor ideal-case comparison for a LOT of reasons including differences in scaling algorithm, encoder selection, encoder settings, trade-offs of frame-rate versus frame-size, inconsistent frame-size between codec generations, inconsistent bits/pixel allocation, choice of one-pass or two-pass encoding, selection of encoder features, selection of sections where bitrate may not be at the nominal target figure, colour-space conversion losses and more. It may also not be historically accurate as material was traditionally in 4:3 aspect ratios in the era that many of the codecs were used, thus encoding settings would not have matched period-accurate clips. Also, flexibility in “dropping“ frames to meet target bitrates (in essence, creating a “variable“ frame rate) was not utilised. Some encoders were also not included due to issues with obtaining correct output from my build of ffmpeg (Theora, Apple Quicktime RPZA). For more information, visit