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5

Well going by the numbers h264 has a lesser bit-depth and color accuracy than ProRes 422. PR422 has 10bit and 4:2:2 chroma sub-sampling, h264 has 8bit and 4:2:0 unless you encode in the Hi422P Intra profile which isn't very well supported in the wild but offers 10bit and 4:2:2. So in that case I don't think you will have any difference what so ever between ...


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Ffmpeg can encode video using ProRes, and runs cross-platform ffmpeg -i input.avi -c:v prores -profile:v 3 -c:a pcm_s16le output.mov will do the trick.


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On Windows, I recommend FootageStudio 4K. It is a commercial converter (not cheap) that supports many professional formats, including ProRes.


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Does youtube store different video files for different bit rate? Yes is the technique called "resampling" ? No Does youtube make live resampling for every user ? No All this things happens live ? No, not on youtube. But Yes on twitch.tv Or it encode and save different video files for different bitrate, so that when a user ...


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There was one, but it fell in to disuse and isn't used very often anymore, largely because of the lack of mobile support, but also due to security issues it created. It was called Flash.


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The original AppleTV could only playback at 1280x720 at 24fps. Because your video is at 25fps, it has to use a slightly lower resolution. If you either lower the frame rate (probably not an option) or exclude the original AppleTV, it should export at the higher resolution. I believe there's another setting than the "Most Compatible" one which excludes the ...


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Try to extract header from other file (e.g. create a new one with that recording software) and prepend it to your stream. On Windows you can use that command to concatenate files: copy /b header.hdr + stream.mov outputFile.mov


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The University of Bath released a paper demonstrating a vector-based video codec a couple of years ago, with a press release asking "is the pixel about to die?". Strangely since then the pixel hasn't died, in fact there are even more of them around than there used to be. You could argue that most video codecs do actually use vectors: DCT (or similar), - ...


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Has anyone done or seen any tests comparing Apple ProRes 422 with high-bitrate H.264? No, but I can tell you that x264 can get as close to lossless as you want (or even mathematically lossless, with -qp 0). x264 can produce h.264 streams in 4:2:0, 4:2:2, or 4:4:4 YUV colorspaces, at 8 or 10 bits per component. (It can also do RGB, but unless you're ...


2

I've tried a bunch of front ends for ffmpeg and finally settled on Tencoder. Widows only. It has a preset for ProRes and is very easy to customize so you can crete setting for often used formats or settings. It is multithreaded and allows you to do batch processing.


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What is Ogg Skeleton? From Ogg Skeleton 4: Ogg Skeleton provides structuring information for multitrack Ogg files. It is compatible with Ogg Theora and provides extra clues for synchronization and content negotiation such as language selection. The latest version of Skeleton, version 4.0, also provides keyframe indexes to enable optimal seeking ...


2

What you want is a very long GOP or I-frame interval. I believe the ffmpeg option -g nnnn will do that, where nnnn is the length of your video in frames. I don't know how to specify "no B-frames", and this will certainly all be codec-dependent. Give it a try.


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The first frame of a video from any codec will always be an I frame. There is no previous picture for other frame types to use as a reference. B frames might still work. The video will start to distort ahead of the cut point, too, if any B frames are trying to reference a future frame that's not there anymore. Actually, with B frames present, display ...


1

I have used both on my Ninja Blade with my C100, no real difference in quality across drastically different circumstances (night vs day). Pro Res works better on Mac, DNXHD works better on Windows. It all comes down to your OS, and whether you have to share the files with broadcasters (in which case I would use DNX as a lot of editors use Avid). Other then ...


1

AVCHD appears to just be h.264 with some constraints. Mainly on framerate and resolution. It looks from the wikipedia page that early versions mostly favoured interlaced encoding, unless you drop down to 720p. The wiki page doesn't say, but I assume it's H.264 4:2:0 8-bit, not Hi10 profile or something. I also have no idea what quality the hardware ...


1

You focus on quality in your question, so the answer is clear: ProRes (in various flavors) offers superior quality. There are other reasons you might choose AVCHD, but they don't relate to quality. AVCHD is generally speaking a distribution format, while ProRes is more an acquisition and intermediate format (it uses all I-frames). ProRes also comes in a ...


1

I think MeGUI is supposed to be a good front-end for x264 encoding. (x264 is the same h.264 encoder that VLC uses.) I don't know anything about powerdirector, so all I can say is that x264 is the best h.264 encoder (best quality vs. bitrate vs. cpu time tradeoff), and it's free. It's what you should use to make files for upload to youtube. (Use lots of ...


1

The problem is probably not WMP but the Microsoft MPEG-1 codec. The straight forward solution other than using a decent player is to use a better codec pack - ffdshow, it feeds WMP through the operating system level. Besides the seek issue you'll probably get better playback performance, and it doesn't require any end-user involvement - they continue to use ...


1

Only Prores 4444 supports alpha channels, see the manual: The Apple ProRes 4444 codec offers the utmost possible quality for 4:4:4 sources and for workflows involving alpha channels. It seems to work for me, using the Animation codec with "Millions of Colors+". I'm on a Mac using Adobe CC. Here are the steps I took: Export your AE comp using ...


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When exporting from Premiere there is a checkbox that says "match sequence settings" which will use the same format as your source video. The "best quality" checkbox is Premiere does not refer to the codec, but to the internal scaling algorithms.


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You can try ffmbc - a customized version of FFmpeg. Unfortunately there are no builds for linux or windows at the moment so you have compile it yourself. Related: What is the difference between ffmpeg and ffmbc now?


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After reviewing the PDF, I can confirm that you are misreading it. They are looking for a flash animation, not a video. You will not be able to use your After Effects assets at all. You need to remake the ad as a flash animation in Adobe Flash using vector graphics in order to fit within their 50KB limitation.


1

There isn't a perfect answer to this problem. AVI and MP4 are just container's for video streams, so without knowing more about the actual streams in the containers, it is impossible to tell how much quality loss there would be, but as a general rule of thumb, it isn't all that atypical for AVI to use far less efficient video compression algorithms than MP4 ...


1

Just to add a little bit more info to SlimSCSI's straight up answer. Does youtube store different video files for different bit rate? Yes and no, for the 1080p stream YouTube utilizes a technique called DASH. This serves essentially a video that was encoded with several different bitrates (though its one file) and adapts the bitrate on the fly ...


1

The Wikipedia article on MPEG-4 is a great start as the MP4 file specification is part of the MPEG-4 spec. Specifically version 2 of MP4 is MPEG-4 Part 14. While not free, you can purchase copies of the ISO spec under ISO# 14496-14:2003. A preview with some detail is available from the ISO here. It is designed to contain any of the various MPEG video ...


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h.264 + aac in .mp4. Google up an x264 settings guide. (or use -preset slower). If you're doing something that the MPEG-LA would charge patent royalties for, screw them and use VP8 or VP9, with maybe a fallback to Theora if that helps compat. Old question, but check the quality at the start of the video if using x264. If it's not good, use 2-pass. I ...


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Yes, some encoders allow changing parameters (like target quality or bitrate, or psychovisual tuning options (x264's aq and psy-rd options). x264, the stand-alone command-line frontend for the library, has a --zones parameter to give more bitrate to some parts of the video. So you could for example reduce the quality for the credits. The actual x264 ...


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Lossless requires such high bitrates that I have more trouble playing back lossless video than 5Mib/s lossy h.264, on my C2Duo (first gen) E6600, 2.4GHz. lossy 5Mib/s 1080p h.264 at 24fps plays perfectly without even having to use mplayer's -lavdopts threads=2 option. (single-threaded software decoding is enough.) My system isn't fast enough to play ...



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