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公开(公告)号：US20220279195A1
公开(公告)日：2022-09-01
申请号：US17747337
申请日：2022-05-18
发明人： Koohyar Minoo , Zhouye Gu , David M. Baylon , Ajay Luthra
IPC分类号： H04N19/40 , H04N19/176 , H04N19/172 , H04N19/154 , H04N19/132 , H04N19/44 , H04N19/98 , H04N19/124 , H04N19/126 , H04N19/136 , H04N19/186 , H04N19/70 , H04N19/184
摘要： A method is provided for encoding a digital video to improve perceptual quality. The method includes receiving a digital video at a video encoder, providing a perceptual quantizer function defined by PQ ( L ) = ( c 1 + c 2 L m 1 1 + c 3 L m 1 ) m 2 , wherein L is a luminance value, c1, c2, c3, and m1 are parameters with fixed values, and m2 is a parameter with a variable value, adapting the perceptual quantizer function by adjusting the value of the m2 parameter based on different luminance value ranges found within a coding level of the digital video, encoding the digital video into a bitstream using, in part, the perceptual quantizer function, transmitting the bitstream to a decoder, and transmitting the value of the m2 parameter to the decoder for each luminance value range in the coding level.
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公开(公告)号：US20220237917A1
公开(公告)日：2022-07-28
申请号：US17722300
申请日：2022-04-15
发明人： Jiyang WU , Churong LIU , Rui GUO , Jiarun LUO , Yiyang XU , Zongxing XIE
摘要： A video comparison method includes: obtaining a first video and a second video; obtaining a first image sequence from the first video, and obtaining a second image sequence from the second video; extracting a first definition feature vector of the first image sequence by using a first feature extraction mechanism of a video comparison model; extracting a second definition feature vector of the second image sequence by using a second feature extraction mechanism of the video comparison model, the first feature extraction mechanism being the same as the second feature extraction mechanism; and determining a definition difference between the first video and the second video based on the first definition feature vector and the second definition feature vector by using a definition difference analysis mechanism of the video comparison model.
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公开(公告)号：US11388367B2
公开(公告)日：2022-07-12
申请号：US16912892
申请日：2020-06-26
发明人： Karin Breitman
摘要： Methods and apparatus are provided for automatically transcoding media files. An exemplary method comprises obtaining an input media file having an input file format and encoded with a codec of a first type; automatically determining output media file formats for transcoding the input media file based on statistics of previously transcoded files and statistics of trending media formats for previously downloaded files; transcoding the input media file into transcoded output media files using a codec of a second type to obtain the determined output media file formats; and generating metadata for each of said plurality of transcoded output media files, wherein said metadata is stored in memory as a media catalogue separately from said one or more transcoded output media files.
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公开(公告)号：US20220191564A1
公开(公告)日：2022-06-16
申请号：US17685183
申请日：2022-03-02
申请人： Google LLC
发明人： Yarong GUO
IPC分类号： H04N21/2343 , H04N19/40 , H04N19/59 , H04N21/231 , H04N21/433 , H04N21/4402 , H04N21/8547
摘要： Implementations described herein relate to methods, devices, and computer-readable media to transcode a video. In some implementations, a computer-implemented method includes obtaining a video that includes a plurality of tracks. The method further includes determining whether a partial transcoded file is available that corresponds to the video. The method further includes, if the partial transcoded file is available, obtaining a timestamp associated with the partial transcoded file, transcoding a portion of the video that begins at the timestamp associated with the partial transcoded file, and combining the partial transcoded file and the transcoded portion of the video to generate an output video. The method further includes, if the partial transcoded file is not available, transcoding the video from a start of the video using the transcoder to obtain a plurality of output tracks and combining the plurality of output tracks to obtain the output video.
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公开(公告)号：US20220191522A1
公开(公告)日：2022-06-16
申请号：US17547165
申请日：2021-12-09
发明人： Ran TANG , Yi WANG , Long ZHENG , Jun HE
摘要： The present disclosure describes techniques of processing video. The techniques comprise obtaining a video to be transcoded, the video comprising a plurality of frames; setting a test object in each of the plurality of frames of the video to be transcoded; transcoding the video using a predetermined video transcoding mechanism and obtaining the transcoded video; extracting a test object from each of a plurality of frames of the transcoded video; and determining a transcoding result based at least in part on the test object extracted from each of the plurality of frames of the transcoded video.
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公开(公告)号：US20220167031A1
公开(公告)日：2022-05-26
申请号：US17541188
申请日：2021-12-02
发明人： Bernd CZELHAN , Harald FUCHS , Ingo HOFMANN , Herbert THOMA , Stephan SCHREINER
IPC分类号： H04N21/242 , H04N21/234 , H04N21/2343 , H04N21/845 , G10L19/16 , G10L25/57 , H04N21/233 , H04N19/40
摘要： Audio video synchronization and alignment or alignment of audio to some other external clock are rendered more effective or easier by treating fragment grid and frame grid as independent values, but, nevertheless, for each fragment the frame grid is aligned to the respective fragment's beginning. A compression effectiveness lost may be kept low when appropriately selecting the fragment size. On the other hand, the alignment of the frame grid with respect to the fragments' beginnings allows for an easy and fragment-synchronized way of handling the fragments in connection with, for example, parallel audio video streaming, bitrate adaptive streaming or the like.
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公开(公告)号：US20220150514A1
公开(公告)日：2022-05-12
申请号：US17096876
申请日：2020-11-12
发明人： Adrian MILLER
IPC分类号： H04N19/40
摘要： A method and system for managing transcoding of data in a stream that includes identifying an input source change for the stream with a new input source type, and adding a decoder for the new input source type, the decoder configured to output for a respective encoder in a transcoder pipeline.
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公开(公告)号：US20220141507A1
公开(公告)日：2022-05-05
申请号：US17576489
申请日：2022-01-14
发明人： Varun Ram , William Dirks , Meera Jindal , Sierra Anderson , John Cowgill , Kenneth Victor Chamberlin , Mark DeSpain , Matthew Brinkley , Khawaja Salman Shams , Alex Xiaoye Zhang
IPC分类号： H04N21/234 , H04N19/40 , H04L65/60 , H04N21/81
摘要： Dynamic transcoding can be used to provide supplemental content, selected to be played during breaks in a stream of primary content, that has the same format as the primary content. It can be desirable to provide supplemental content that is personalized. This may include additional content or advertising that may be of interest or relevance to a viewer. In many instances, the supplemental content will come from a different source and thus can be in a different format. Approaches in accordance with various embodiments can take advantage of dynamic transcoding of the supplemental content to provide properly formatted supplemental content through the same stream as the primary content. A custom manifest can be provided to the media player that points to the transcoded supplemental content. At an appropriate break in the playback, the media player can use the manifest to obtain the formatted supplemental content.
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公开(公告)号：US11297353B2
公开(公告)日：2022-04-05
申请号：US17255016
申请日：2020-04-06
申请人： Google LLC
发明人： Jessie Lin , Zhengzhong Tu
IPC分类号： H04N11/02 , H04N19/86 , H04N19/117 , H04N19/176 , H04N19/40
摘要： A method of measuring a banding artefact in an image includes generating a gradient profile from the image, where the gradient profile includes respective gradient magnitudes of pixels of the image; generating, using the gradient profile, a candidate banding pixel (CBP) map, where each location of the CBP map is such that a gradient magnitude of the gradient profile of a corresponding pixel of the image being greater than a first threshold and smaller than a second threshold; generating, using the CBP map, a banding edge map (BEM), where the BEM includes connected banding edges of the image; generating, using the BEM, a banding visibility map (BVM), where the BVM includes a respective banding metric for at least some pixels of the image; and generating a banding index of the image using the BVM.
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公开(公告)号：US11289125B1
公开(公告)日：2022-03-29
申请号：US16032977
申请日：2018-07-11
IPC分类号： G11B27/031 , H04N19/40 , H04N21/854 , H04N21/8543
摘要： According to one implementation, a media content conformation system includes a computing platform having a hardware processor and a system memory storing a software code. The hardware processor executes the software code to receive an editing file including edits to media content, the edits being based on a compressed representation of the media content and having a first data format. The software code also obtains cross-referencing data that maps a timecode data of the compressed representation of the media content to segments of an uncompressed representation of the media content, and transforms the editing file to a conformation file including the edits in a second data format based on the cross-referencing data. The conformation file enables rendering of an edited version of the media content including the edits.
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