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It also tends to stabilize areas of the image that are changing in very minor ways, which can be a good thing visually if those minor changes aren't "real"In our particular case, we use the x264Encoder QuickTime codec, which provides x264 in the form of a plug-in component that integrates into the Mac OS X QuickTime video library, allowing easy use from most Mac applications including our batch-encoding tool of choice, CompressorReply GeorgeOu says: November 4, 2014 at 6:46 pm But H.264 SVC just runs multiple layers of H.264 AVCAt 1080p HQ none of the major providers currently offer a comparable version, so it's been left out of the chart for simplicity, although similarly high bitrates are available from niche vendors and are common for high-quality 1080p encodings in the pirate worldFilm grain or camera sensor noise is usually enough of a change that DCT-based decimation won't skip it, assuming the resolution and bitrate are high enough to capture that level of detail, but dark scenes where the grain is invisible, or very clean sources like computer graphics can be a problem for DCT-based decimationFirst, there are the providers whose bitrates seem too low: YouTube and Vimeo, plus Netflix and Hulu at the lower resolutionsx264's default is 3 reference frames, which is also what YouTube usesHaving too many keyframes severely reduces quality, because the efficiency of reusing image areas from previous frames is completely lost at each keyframe the encoder has to "start over" at every keyframe

The video's aspect ratio is a result of the camera's viewing area and the codec and resolution used to encode the videoFortunately, over 70% of users have Internet links fast enough to get to at least the 480p version, where we do use high profilex264's default is 10% of the maximum keyframe interval, which would often be about 1 second, and makes sense since there's no need to have two restart points closer than thatHandbrake's iPhone 4, iPad 1 and Apple TV 2 presets also use high profileReply Steven Gage says: September 24, 2012 at 7:43 am So in that case, what is the media flow for a 3 way call between Lync 2013 endpoints, If A is sending to the AVMCU, is the AVMCU providing a compositing function and then sending a single image to B and C (so A+B to C, B+C to A, and A+C to B)? Reply jeffschertz says: September 24, 2012 at 8:23 am All media sessions are from client to MCULower quantizers remove less of the minor values in the DCT matrix of frequency coefficients for each block, preserving more of the original signal's frequency distribution, meaning the output is closer to the original image, and leaving more coefficients to be written to the file

The texture/gradient/whatever must pass both thresholds before any filtering is applied." At most, the beta threshold should only be changed very slightly, but a small change to -1 can improve overall sharpness at the risk of some visible blockingaggressive motion-estimation search, which helps find as much temporal and spatial redundancy in the image as possible, using a large number of initial candidate predictors followed by a complex, uneven multi-hexagon search (with early exit for speed), followed by sub-pixel refinement using full rate-distortion optimization to account for the real, final cost-vs-benefit of each choice excellent bitrate control/distribution, using macroblock-level analysis ("MB-tree") to track the degree of referencing of each macroblock through the actual motion vectors from future frames, allowing the encoder to only lower the quality in the areas of each frame which are changing rapidly (not referenced much in the future), rather than lowering the quality of the whole frame as in most encoders essentially traditional bitrate control but applied at the level of each 16x16 macroblock rather than at the whole-frame level which helps maintain clear, stable backgrounds in the presence of moving foreground objects intelligent, adaptive, variable use of B-frames, rather than just using a fixed pattern like IBBPBBPBBPBB as in most encoders, to make better use of the available bitrate by inserting the more expensive but higher-image-quality I- and P-frames where they're of most benefit to serve as reference frames, which is good at all times but is particularly important during fades (one of the hardest things to compress well) adaptive quantization, which varies the quantizer for each individual macroblock within each frame to avoid blur/blocking in flat areas containing fine/edge detail, such as calm water, sky and animation full rate-distortion optimization used for motion-vector refinement, macroblock partitioning (subdividing each macroblock, balancing the cost of additional motion vectors against the benefit of the less complex residual image left to encode), and final quantization (the key lossy step!), which selects locally-optimal motion vectors, macroblock partitioning and quantization based on cost-vs-benefit using the real, actual cost of each possible choice when that choice is processed right through to final entropy encoding, versus the image-quality benefit as measured by the RDO metric (see below) a "psycho-visual" rate-distortion optimization metric, which tries to match perceived visual quality better by de-emphasizing blurry "low-error but low-energy" choices, rather than using simpler metrics like sum of absolute differences (SAD), peak signal-to-noise ratio (PSNR) or structural similarity of images (SSIM), which all tend to lean towards low numeric pixel differences but too much blur widgetNinja says: July 23, 2012 at 2:54 pm Thanks for the great write-up JeffIt was originally part of the more esoteric fidelity-range extensions, which included the niche profiles (see below), but high profile is far more useful because it adds one key feature the option to adaptively use an 8x8 block size for the DCT, rather than just 4x4It's useful to compare our chosen video bitrates with the major online video providersIf the user was to jump into the middle of the video and land in a high-motion scene which temporarily uses double the target bitrate, the player would start playback then suddenly pause and have to wait while it bufferedWill Lync 2013 natively communicate with Cisco Telepresence Video EndPoints using H264? Cheers Reply jeffschertz says: October 15, 2012 at 6:23 am If you read the final paragraphs in the article you'll see that I state that this is all up to the vendors themselvesBut without those updates the AMG will be a requirement for 2013 interop as Lync 2013 has dropped the H.263/CIF option

The gateway is great as some of my legacy endpoints are 4-5yrs old and I didn't have the funds to change them outThis document describes in detail a set of resolutions, bitrates and settings used for high-quality H.264 video encoding, and the reasoning behind those choicesHis latest post addresses Lync Server 20132s interoperability with other video conferencing technology out thereUnfortunately, some players, such as QuickTime, have bugs playing back files with quantizers below 3, which is why the x264Encoder QuickTime plug-in defaults to a minimum quantizer of 4, and Handbrake similarly defaults to 3As I've already described the interop scenarios are not yet defined as video partners are still working with Microsoft on defining the operationOther than that, the content looks reasonably good, just at a very small, low resolution

All: 3, for QuickTime compatibility432p-1080p: 3 (default), for compatibility with older ATI/NVIDIA GPUs and Android devices based on the Tegra 2 processor, and possibly other hardware decoders with similar bugs (3 B-frames is a pretty "standard" setting, and a lot of people use it, so it should be very unlikely to break anything)This yields a modest but noticeable improvement in compression efficiency, and therefore quality at a given bitrate, without significantly impacting playback complexity or CPU loadAll: 4, which should find about as much useful similarity as there is to find, doesn't blow out the encoding time ridiculously, complies with the target H.264 levels, is safe for almost all known hardware decoders (assuming Android 3.1+ on Tegra 2 processors), and shouldn't really stress software players too muchNote that with a setting of 2, about 67% of all frames will be B-frames, with 3 that rises to a maximum of 75%, 4 to a maximum of 80%, and 5 to around a maximum of 83% if the encoder was actually to frequently use 5 consecutive B-frames, which is unlikelyOnly the IM, Presence, and Audio modalities are listed for support at launch of 2013 but one can assume that video will be added to that list in the futureBaseline is the only profile supported on very old handheld devices such as the early video iPods and the original iPhone 1/3GReply Steven Gage says: September 24, 2012 at 5:00 am Got it, thank youThe search pattern is the pattern used during motion estimation to search for the most similar area to each macroblock in each possible reference frame, in order to select the best motion vector for each macroblockIn a web playback scenario, however, whether it's adaptive streaming or the more usual progressive download while playing, we can't let the bitrate fluctuate too wildly, because severe spikes or sustained overruns of the target bitrate might cause playback to pause (for buffering), and pausing is much worse from an end user's point of view than a bit of blurring during a high-motion scene c81eca7253
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