[The Media Foundation docs specify][1] that the maximum sample rate supported by the Media Foundation AAC decoder is 48k. However, I've been testing passing files with higher sample rates such as 96k and these files are decoded on my up to date Windows 10 machine. The same files I've used to test 96k sample rate support do not work on some other test machines I've tried with. This suggests that at some point he supported sample rates may have changed, but the documentation has not been updated. Is this the case? [1]: -us/windows/win32/medfound/aac-decoder?redirectedfrom=MSDN#format-constraints+specifies
I'm investigating this from the context of Mozilla's decoding pipeline, so it's difficult for me to extract a minimal example. We're tracking this in _bug.cgi?id=1698639 -- Firefox currently limits the sample rate to 48K and won't pass higher sample rate media to the decoder. However, I'm hoping to relax those constraints shortly. After Firefox is updated I could report back, and then your engineers could observe by testing in the browser.
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Firefox has landed changes to support the undocumented sample rates if the underlying Windows decoder does. You can see this by playing the following test file in Firefox Nightly: -unified/raw-file/tip/dom/media/test/bipbop_audio_aac_96k.mp4 (it should play back with a beeping noise).
Assuming that Windows Media Player uses Microsoft's AAC decoder, another test is playing that file in Windows Media Player. The file will playback on my up to date Windows 10 machine, indicating a broader support for sample rates than stated in the docs.
Firefox has built in support for open media formats usually associated with MP3, WebM, Ogg, and Wave containers. However, MP4 containers usually depend on platform decoders for AAC and H.264 audio and video streams. For more information, see HTML5 audio and video in Firefox.
VS-104D-3GSDI is a cost effective decoder based on H.264 with 3GSDI, HDSDI, HDMI and CVBS Outputs. VS-104D-3GSDI is capable of decoding the RTSP stream generated by most IP cameras or encoders as well as Onvif compliant high end cameras from Axis, Bosch, Sony, Pelco and many more.VS-104D-3GSDI can decode and display A/V up to 1080p60 on a monitor. Also, users can control pan, tilt and zoom for an IP Camera that is connected to the VS-104D-3GSDI via Onvif using a keyboard controller like the VS-TKS-100. RTSP/RTP and especially MPEG-TS can be utilized to build a cost efficient Local Multicast Solution supporting many Decoders. VS-104D-3GSDI can decode 1 100 IP Camera URLs and display them using sequencing or individual selection.The CVBS (Composite) Output can be used to Record HD IP Cameras and Encoders. The VS-104D-3GSDI not only supports Commercial Resolution like 1080P/60 but also Broadcast Resolutions like 1080i/59.94, 1080P/59.94, 720P/59.94 and 23.98PsF ideally complimenting Encoders like the VS-104-3GSDI.
The first version 0.1.0 of the AV1 reference codec was published on 7 April 2016. Although a soft feature freeze came into effect at the end of October 2017, development continued on several significant features. One of these, the bitstream format, was projected to be frozen in January 2018 but was delayed due to unresolved critical bugs as well as further changes to transformations, syntax, the prediction of motion vectors, and the completion of legal analysis.[citation needed] The Alliance announced the release of the AV1 bitstream specification on 28 March 2018, along with a reference, software-based encoder and decoder.[16] On 25 June 2018, a validated version 1.0.0 of the specification was released.[17] On 8 January 2019 a validated version 1.0.0 with Errata 1 of the specification was released.
Film grain synthesis (film_grain) improves coding of noisy signals using a parametric video coding approach.Due to the randomness inherent to film grain noise, this signal component is traditionally either very expensive to code or prone to get damaged or lost, possibly leaving serious coding artifacts as residue. This tool circumvents these problems using analysis and synthesis, replacing parts of the signal with a visually similar synthetic texture based solely on subjective visual impression instead of objective similarity. It removes the grain component from the signal, analyzes its non-random characteristics, and instead transmits only descriptive parameters to the decoder, which adds back a synthetic, pseudorandom noise signal that's shaped after the original component. It is the visual equivalent of the Perceptual Noise Substitution technique used in AC3, AAC, Vorbis, and Opus audio codecs.
AV1 defines three profiles for decoders which are Main, High, and Professional. The Main profile allows for a bit depth of 8 or 10 bits per sample with 4:0:0 (greyscale) and 4:2:0 (quarter) chroma sampling. The High profile further adds support for 4:4:4 chroma sampling (no subsampling). The Professional profile extends capabilities to full support for 4:0:0, 4:2:0, 4:2:2 (half) and 4:4:4 chroma sub-sampling with 8, 10 and 12 bit color depths.[16]
In October 2016, Netflix stated they expected to be an early adopter of AV1.[79] On 5 February 2020, Netflix began using AV1 to stream select titles on Android, providing 20% improved compression efficiency over their VP9 streams.[80] On 9 November 2021, Netflix announced it had begun streaming AV1 content to a number of TVs with AV1 decoders as well as the PlayStation 4 Pro.[81] 2ff7e9595c
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