Writing library : libebml v1.3.5 + libmatroska v1.4.5įormat profile : settings : CABAC / 4 Ref Frames Writing application : mkvmerge v15.0.0 ('Duel with the Devil') 64-bit The file has the following properties: Format : Matroska The output format is not important to me. That's why I'm not mainly interested in keeping same quality, but in reducing size from 11GB to about 3GB-4GB (about 3 times) as fast as possible.įWIW, I am in Linux but prefer Handbrake to something like ffmpeg in terminal because I like to see info on progress the way Handbrake shows it and because I want to test this program and learn how to adapt its use to my needs. My intention is to keep the original and to create smaller versions for practical reasons when watching on various devices that imply copying to a USB flash drive, etc… QP/RF values are obviously only changing the video sizes.I have a good quality black and white old movie in MKV format of 11GB. If you increase the QP value, to reduce the file size, an advanced mode QSV encode should still look cleaner than the default QSV providing their overall video bit rates are very similar.įinally do remember the size taken up by the audio tracks only changes if you encode them differently from the source file. The advanced QSV mode is around 45% larger than the default, at the same QP value. If you wished, you could encode using QSV and the Very Fast preset on the same source files to compare quality and file sizes.ĭependent on source, for QSV encoding 1 QP value change equals roughly a 15% increase or decrease in the file size. This method works the same for software encoding. If you just ran test encodes and didn’t know the original sizes you’d have no way of knowing how they compared. When you know the sizes of the source files you can directly compare the two. If as an example you have 4 extracted source files totaling 2GB and 4 encoded files, all encoded at the same QP, totaling 0.2GB, then your final encode should be around one tenth of the original file size. Use an MKV splitter and extract four or five 2 minute clips and use the extracted files as the sources for your encode tests. The most repeatable method to assess quality and final file size is if your source file is an MKV. Just be aware fast encoding (QSV or software) and a low bit rate will usually lead to poor results. The Very Fast Handbrake preset, still much slower than QSV, is a very basic encode and where QSV encoding can have advantages. If encoding speed is very important QSV is an effective option, it’s finding out what suits your needs. QP and RF values themselves are not directly comparable. Adjusting the QP/RF of either encode method operates on the same principle the higher the value the lower the file size and quality. It's source dependent but, for QSV, increasing the QP number by 1 or 2, should get you closer to the file size of a software encode. What looks acceptable on a 14" screen can look a mess on a 40" - 50" screen. You’ll need to adjust your quality slider settings as files will be larger, but the results for the same file size are much cleaner than you'll get from the default QSV setting.Īs an side whenever comparing encodes always try to view them using the largest screen available to you, not just your PC screen. Try the default mode and if you want to experiment with a higher quality QSV encode setting, copy and paste the text below, as written, into the Extra Options window on the video tab. Set the Encoder preset slider to Balanced, not Speed. If your PC is compatible it will appear as H.264 (Intel QSV) in the drop down Video Codec list on the Video tab of Handbrake. If speed is your main requirement though, while I normally don’t recommend QSV encoding, if you have a compatible Intel i5 or i7 PC, the results would be better than the Very fast setting and be even faster. The focus of both Very Fast and Fast presets is definitely speed over quality. It's subjective but the Very Fast setting uses a really basic analysis which will lead to a rougher appearance.
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