This document aims to get you working efficient video playback on Ubuntu, as simply as possible, as well as outlining future plans. There's a lot of complicated stuff written on this topic.
Note this document covers Intel CPU/GPUs only. If you have quick upstream capabilities don't waste your time for searching close to perfect settings - YT will destroy your video and you will be very frustrated after all.Hardware-Accelerated Video Playback on Intel CPUs in Ubuntu Lanczos may increase amount of ringing around edges when encoder is forced to use high qp factor.Ĭoncept of best is purely subjective and on some very important video forum it is forbidden to use "best" to describe quality at all - however behind filter there is math and math lead to some objective conclusions - splines are very well balanced between objective and subjective aspects of video resizing. I would advise you to upscale with some xbrz family filters or spline - one of easiest tricks id upscale xbrz twice and downsize spline by half - this works quite well as crude antialiasing filter. There are some tricks to force YT higher quality, one of common tricks is upsizing video to higher resolution as YT will allocate for such video higher bitrate and overall quality loss will be lower.Ĥ44 will be immediately converted to 420 so it is better to upscale your 1920x1080 (my assumption) twice to 4k. but if i must in the future, what do you think is best between bilinear, bicubic, and lanczos? Once again - read about YT and how video are re-compressed by YT engine - pushing highest quality when uploading has no sense - if you search there is at least few threads on this (game to YT) - people complain but you can only accept YT policy or upload video somewhere else - sorry. Someone from a forum told me that the best filter is a subjective opinion. yuv444 looks so much better which is why uploading it to youtube is really problematic. I can't achieve this with a lower setting than what i just said. hence i was trying to get an output that's indistinguishable from my source. I just wanted to get the best quality i can get before i upload it to youtube. Use A53 Closed Captions (if available) (from 0 to 1) (default 1) Insert recovery point SEI messages (from -1 to 1) (default -1) QP difference for the refresh MBs (from -32768 to 32767) (default -32768)
Number of frames in the intra refresh cycle (from -1 to 65535) (default -1) Intra refresh type (from -1 to 65535) (default -1) Depth of look ahead in number frames (from 0 to 100) (default 0) Use VBR algorithm with look ahead (from 0 to 1) (default 1) Maximum number of frames buffered in the DPB (from 0 to 65535) (default 0)
Put all the SEI messages into one NALU (from -1 to 1) (default -1) Insert picture timing SEI with pic_struct_syntax element (from 0 to 1) (default 1) Distance (in I-frames) between IDR frames (from 0 to INT_MAX) (default 0) Strategy to choose between I/P/B-frames (from -1 to 1) (default -1) Adaptive B-frame placement (from -1 to 1) (default -1) Adaptive I-frame placement (from -1 to 1) (default -1) Extended bitrate control (from -1 to 1) (default -1) MB level bitrate control (from -1 to 1) (default -1) Toggle bitrate limitations (from -1 to 1) (default -1) Maximum encoded slice size in bytes (from -1 to 65535) (default -1) Maximum encoded frame size in bytes (from -1 to 65535) (default -1) Enable rate distortion optimization (from -1 to 1) (default -1) Use the video conferencing mode ratecontrol (from 0 to 1) (default 0) Convergence of the AVBR ratecontrol (from 0 to INT_MAX) (default 0) Accuracy of the AVBR ratecontrol (from 0 to INT_MAX) (default 0) Maximum processing parallelism (from 0 to INT_MAX) (default 4)
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