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1

This is a document from the ITU : http://www.itu.int/rec/R-REC-BT.1120-8-201201-I/en that specifies Digital interfaces for HDTV studio signals. This kind of signal is commonly carried on an HD-SDI physical layer.


1

You're right, at some point it visually looks better to downscale and have a lower rez but less artifacty video. The bitrate where this happens depends strongly on how compressible your content is. One way to judge this for x264 might be to look at the rate-factor. For 2-pass, the x264 output includes the rate-factor. For CRF mode, the CRF value you set ...


1

You can't recover information that isn't present in the data you have. Sometimes there's useful information hidden by noise, and filtering can help. However, esp. in the case of downscaling/upscaling, information is just gone. These wiki links are way too general and mathy to be specifically helpful, but this is the theory behind why you can't recover ...


2

They came in as .ogg?? I thought you converted to dvd? Are you talking about then ripping the DVD video with HandBrake or something? Also, you're doing something wrong, or at least have your file extension -> "open with" settings screwed up if renaming a .ogg to a .mp4 is necessary. Maybe it opens with a different player then, and only the player ...


0

To add an answer to part1 of the question, the reason for telling the video encoder how much data the player will buffer is so it can constrain its VBR rate-control to not underflow the player's buffer (video pauses and user sees "buffering") in complex portions of the video where it wants to spend a lot of bits. Within the limits of the VBV buffer size, ...


2

Like slhck says, you can compare 2 digital video files with metrics like SSIM. Your question also asked about brightness and contrast, and other things which will depend on the physical monitor that the video is displayed on. If you want to be sure that the right photons come out of the screen, given the pixels it was sent, then you need to calibrate your ...


1

Unfortunately, no. Increasing the resolution of a video after recording is impossible. You can upscale the video, but that will simply copy the pixels and maybe interpolate a bit, but the result won't look any better than the original. If, as I presume, whatever you saw there is just a bunch of colored pixels in your video, there's nothing you can do to ...


3

One big loss in converting VHS to DVD arises from going through the composite domain. Both VHS and MPEG2 use a separated chroma paradigm -- on the VHS tape are two signals, essentially luma and bandwidth-limited chroma. MPEG2 (the standard for DVD) also uses separate luma and chroma. But the standard output from a VHS player combines the signals in a way ...


1

The best way to conserve the VHS's would be to scan each frame in at the highest quality possible and export to a video file, this would be a very long process and would require some expensive kit or a professional service. If they are historical value and you want the best it would be worth spending the money and getting it done by a pro but that cost is ...


3

There are quite a few programs that do so-called "full reference" measurement, i.e. comparing an original against a degraded signal: http://www.acceptv.com/en/products_vqa.php http://compression.ru/video/quality_measure/index_en.html (commercial) http://www.its.bldrdoc.gov/resources/video-quality-research/guides-and-tutorials/description-of-vqm-tools.aspx ...


1

According to the blender documentation found here Rate The bitrate control also includes a Minimum and a Maximum. Buffer The decoder bitstream buffer size. the buffer size is related to streaming video. The link in the manual takes you to this article which describes what the buffer is. It sounds like you are editing for web streaming in ...


4

Movies have certain "looks" to arouse certain moods. The lightning and color depends on the intention of the movie and each individual scene. Let's take the picture you linked as an example: The footballer is lit by the floodlights in the stadium. He is lit from every side so that you can see as much as possible, there is little shadow and contrast. The ...



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