![]() ![]() Those were the bad ole days, but we loved them. I used to use 2 pass when encoding DVD (mpeg2) episodes of Buffy and Lost Girl (Lot of night scenes, lot of kung-fu action, hard shadows) and it helped but took hours back then, and you had to fit the eps on CDROM. You can try it and see if it helps visually and seems 'smoother' in the action sequences, but it is a big time increase per file. It is better than a single pass that has a less localized compression rate when you want smaller files. 2-pass optimizes the compression level dynamically so there is less compression (and therefore distortion) in the highly kinetic and detailed scenes with sharp edge delineations. It’s a complete, cross-platform solution to record, convert and stream audio and video (in case you never had heard of it). So to get started you obviously need FFmpeg installed. The single pass vs two-pass debate is not a thing for high-quality, high-bitrate encodes.It helps for high-compression encodes, and when file size is an issue. So if you’re in a hurry you might prefer H.264 -) But for 1080p and even 1280p videos H.265 produces better results and smaller files. You can try veryslow but it takes longer and looks barely better, Though highly kinetic action scenes exhibit "slightly" less blur I guess, but then action scenes move along so fast you really don't notice it unless the original is potato quality to begin with.-crf 18 and -crf 20 may be about the same, with the exception of very dark scenes. I have a situation where I need to decode low-latency H.264 streams (also known as. for one, a fast action sequence for another, a dark moving sequence or nightime scene, and a very finely-detailed scene with lots of things in it but not a lot of motion, perhaps people in a dining room talking or in an office across a desk.įfmpeg -i input.mp4 -c:v libx264 -profile:v high -preset slow -tune film -crf 18 output.mp4 H.264 decoding using ffmpeg + using GPU for display acceleration. A brightly colored video with blue sky, peoples faces, etc. I would suggest taking about 4 different sections of video with different visual profiles and seeing what works for each and all. Then experiment with parameters encoding into x264 at various settings until you are satisfied it looks "the same" as the x265 video you started with. So you make a trade-off in terms of time, file size, and computer power to achieve a nice re-encoding of the video stream. What you are trying for is "indistiguishable quality" from one encoding to another.
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