H264 decompressor2/18/2023 ![]() ![]() The test results are displayed in Tables 1 and 2. The test files are "tractor-ultrafast.264", "tractor-superfast.264". Leaping ahead, the compression is only possible with the "ultrafast" preset, revealing no result with the "superfast" preset. Picking recoding-enabled software, we opt for the ffmpeg console utility ("libx264" module). ![]() The compressor returns an error for YouTube files (they include B-frames and use CABAC), so we leave those behind our testing framework. Like the previous samples, it contains no B-frames, but uses CABAC rather than CAVLC as an arithmetic coder. We select the "VID_20150917_131139.264" file as an ordinary cell-phone video clip. Users may employ a bunch of tools to get video files: shoot a video with a camera (eg., on a cell-phone), download it from numerous video services (YouTube, VK, Vimeo, Facebook, etc.), or use software with recoding functionality. Video stream structure for "tibby.264" file Other test files Picture Parameter Set block for "tibby.264" file Sequence Parameter Set (SPS) block for "tibby.264" file We picked the first three files for our efficiency tests. The files' main properties are the use of CAVLC (PPS, entropy_coding_mode_flag: 0) and no B-frames (SPS,max_num_reorder_frames: 0). We upload them into Zond 265 and discover they have been compressed by the same method (see Zond 265 screenshots, Bitstream tab, pic. For that purpose, we'll be using Solveig Multimedia's ZOND 265, an analyzer of H.264 and H.265 video files, as an auxiliary tool.Īccording to Git repository, the DropBox team used these files as test material: "black.264", "tibby.264", "walk.264", 'BA1_FT_C.264", "BAMQ2_JVC_C.264". Our article aims to assess efficiency of this algorithm on compressing diverse file formats. Besides, the result of the compression is not a video file of the source format. Hence the DropBox algorithm is a lossless one. An average user cares little about how these files are stored, what matters is to download exactly the same files intact – the way they got uploaded. The company's main focus is on storage of their customers' files. In August 2015 DropBox unveiled their vision of the issue - an original, yet incomplete, algorithm for H.264 standard video files. However, there are a few options out there. Video is one of the heaviest data formats, so there's no surprise that video processing, transfer and storage services have to consider compression as a viable solution. Both conditions can only be met if the H.264 codec is set for maximal speed coding. Besides, this compression method could result effective under two conditions: if the file used CAVLC as a coder, or the file was coded with PU and TU blocks of maximal size. With half an eye, we realized a re-compressed H.264 file ceased to be H.264 and could only be used for interim storage. Dropbox developed a lossless compression algorithm for H.264 and JPEG files, and our team got down to evaluate this solution and glean some tangible details. Download freeĪ couple of weeks ago we bumped into an article about Dropbox engineers recreating the Pied Piper algorithm from a popular TV show. TriMP4 for Android Edit your phone videos in one click.Sync Checker SDK Audio/video sync checker SDK Read more.Media Utilities Open source AVI Demultiplexer, DirectShow Filter, and more.HyperCam SDK Developing applications for screen/sound data capturing.Video Editing SDK Develop your own video/audio editing software.HTML5 Cloud Video Editor Professional HTML5 Video Editor with transitions, text overlay, voice-over and smart rendering Read more. ![]() Zond 265 - HEVC Analyzer In-depth analysis of HEVC/H.265 and AVC/H.264 video bit streams.WMP Trimmer Plugin Business Video editor inside Windows Media Player at your workplace.HyperCam Business Grab your screen actions at work.Video Splitter Business Become a video editing pro with an intuitive tool.Free Online Video Editor Edit your videos online FreeOnlineVideoEditor.Free AVI Trimmer+ Cut and join AVI videos at ease. ![]() Video Splitter MAC Edit video on you Mac with original quality.WMP Trimmer Plugin Home Turn your Windows Media Player into a video editor! Free trial Buy.HyperCam Home Best-in-class screencasting software.Video Splitter Home Lossless editing of compressed video streams. ![]()
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