How does 4K upconversion work?īe it a display chip of a monitor or a television set, there are modules responsible for image scaling. Shortly speaking, an upscaled 4K will look better, but not astonishingly perfect. If the quality of the source is far too low (720p HDTV), it will never outpace the look of an ultra-high quality source (4K). Besides, it is worth noting that the upscaling quality very much depends on the sources. The truth is that sometimes you can't even tell the difference between an upscaled 4K and a native 4K video on the same 4K TV screen merely by the sight of your eyes. In theory, you would probably think if a video has a 4K resolution it will look perfect on a 4K TV, but this is not always the case. Upscaled 4K vs Native 4K, is there any difference in quality?Īn upscaled 4K (from 1080p) video will, of course, look better than the one without upscaling (1080p) on a 4K TV, but a 1080p video can only approach its perfection on a 1080p TV. By contrast, 1080p refers to a content with 1920X1080 pixels and progressive scanning. To be precise, the distribution, 4096X21X2160, is for household media and cinema industry respectively. 4K resolution, also referred to 4K, means the horizontal display resolution of about 4096/3840 pixels and vertical resolution is around 2160 pixels. P.S.Before we go further, let's make it clear the terms of 4K and 1080p resolution. just wanted to post it to sum what I'm doing for the case it may help someone else. Not perfect solution for sure, but ok for me so far. also after talking with some guys on ffmpeg irc channel about this following their suggestion I did created an enhancement ticket on ffmpeg trac about eventually making a way to have a filter option allowing to convert latm to raw aac with 'copy' option on ffmpeg, without needing to re-compress audio, the ticket is at:Īlso if I want a really fast way to convert files just temporarily to play on wdtv I can also just convert audio to pcm with:įfmpeg -i input.ts -sn -vcodec copy -acodec pcm_s16le output.mkv while using ffmpeg to recompress audio to aac will output non latm aac recompessed audio, and that surely doesn't have any problems to be played. ffmpeg includes code to handle/decode latm aac, however if we just 'copy' such latm aac audio to mkv then almost nothing will play audio on such mkv file. It takes near 5 min to recompress audio on 1h30m files, not that bad. I do just use:įfmpeg -i input.ts -sn -vcodec copy -acodec libvo_aacenc output.mkv but just found that latest ffmpeg build from git doesn't need the -r anymore, it now detects framerate properly, also despite not perfect solution, I'm currently using it to easily convert my ts's to mkv by just re-compressing audio, to be able to play on wdtv properly, i.e. Didn't tried demultiplexing, converting audio and remultiplexing with mkvtoolnix yet.
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January 2023
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