Lec 15 Multimedia Systems I: ISO Based File Format (Mp4) and DASH
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1 Multimedia Communication Lec 15 Multimedia Systems I: ISO Based File Format (Mp4) and DASH Zhu Li Course Web: Z. Li Multimedia Communciation, Spring 2017 p.1
2 Outline ReCap Lecture 14 MPEG File Format ISOBMFF/Mp4 MPEG DASH Dynamic Adaptive Streaming over HTTP Summary Z. Li Multimedia Communciation, Spring 2017 p.2
3 QoS QoS Quality of Service A network centric metric Measuring the delay, loss, throughput,..etc Does not directly translate into user experiences Typically characterized by the packet arrival and departure curves Buffer size: b(a,d, t), delay, d(a,d, t) Z. Li Multimedia Communciation, Spring 2017 p.3
4 Subjective and Objective QoE MOS Scores User Study based PSNR most widely used, good correlation with MOS Weigthed PSNR (from different channels) Weighted MSE WPSNR = w 1 PSNR 1 + w 2 PSNR 2 + w 3 PSNR 3 WPSNR_MSE 10log 10 (w MSE 1 1 (2 1) w MSE 2 B 2 2 w 3 MSE 3 ) Z. Li Multimedia Communciation, Spring 2017 p.4
5 Perceptive QoE: SSIM Structural Similarity Measure (SSIM) current state of art General factorized form of power a, b, c: SSIM x, y = [l x, y a c x, y b s x, y c ] Typically used: a=b=c=1, K 3 = K 2 2, let C 1 = K 1 L 2 C 2 = K 3 L 2 Then: SSIM x, y = (2μ xμ y + C 1 )(2σ xy + C 2 ) (μ x 2 + μ y 2 + C 1 )(σ x 2 + σ y 2 + C 2 ) Matlab Implementation: [val, map]=ssim(ref_im, im); Z. Li Multimedia Communciation, Spring 2017 p.5
6 Validation with MOS Scores SSIM is a better predictor than PSNR Dataset JP2(1) JP2(2) JPG(1) JPG(2) Noise Blur Error # of images PSNR SSIM JPEG images JPEG2000 images Fitting with Logistic Function JPEG images JPEG2000 images Fitting with Logistic Function MOS 50 MOS PSNR MOS(PSNR) MSSIM (Gaussian window, K1 = 0.01, K2 = 0.03) MOS(MSSIM) Z. Li Multimedia Communciation, Spring 2017 p.6
7 SSIM Matlab Example ssim(im, ref_im): Download qoe.zip from course web: Encode sequence with different bit rates, different frame structure Compute SSIM between coded frames and the original Z. Li Multimedia Communciation, Spring 2017 p.7
8 Outline ReCap Lecture 14 MPEG File Format ISOBMFF/Mp4 MPEG DASH Dynamic Adaptive Streaming over HTTP Summary Z. Li Multimedia Communciation, Spring 2017 p.8
9 MPEG File Format (FF) The problem Different audio/video compression technology produces different bitstreams How to create a format that different applications can built an uniform APIs to interpret the bit stream, access the audio/visual content? The Solution ISOBMFF ISO Based Media File Format aka, Mp4 Z. Li Multimedia Communciation, Spring 2017 p.9
10 ISOBMFF Design Philosophy Key Features Object Oriented Binary, Compact Representation Separate Logic structure from Physical storage. Hierarchical Structure and layers of abstraction for easy access Extensible: forward and backward compatibility, supporting many storage and streaming applications,.mp4, DASH, MMT, Flash,..etc Main Applications Storage: o Store audio visual streams as separate tracks for ease of access and editing o Minimizing disc access by having a structure for random access Local Playback and Remote Streaming: o Necessary timing information for playback o Design of media data encapsulation for transport agnostic streaming,e.g, over RTP, over HTTP, over WebSocket. Z. Li Multimedia Communciation, Spring 2017 p.10
11 ISOBMFF File Logical Structure A file Contains Streamable timed data in tracks of a movie Other data (untimed or non streamable) in items Or a combination of both Defines a common timeline for all tracks for synchronization Important for audio/visual content playback Declares its type and its compatibility For interoperability Z. Li Multimedia Communciation, Spring 2017 p.11
12 ISOBMFF items Untimed data, items: Kind of a global variable, data consumed as a whole, valid for the whole presentation time frame of the media data o E.g, copyright info o E.g, logos If having multiple items, then primary item is the entry point to access Can be encrypted, require key to access Can be compressed. Z. Li Multimedia Communciation, Spring 2017 p.12
13 ISOBMFF track A track Corresponds to a timed data of a specific type o Audio track of aac media type o Video track of avc media type o Video track of hevc media type o Hint track does not have media data It is decomposed into samples o Samples are associated with an unique timestamp, o e.g, a frame in video sequences Is usually associated with a single decoder o Need to specify, e.g, avc codec, hevc codec, aac codec, mp3 codec Has prescribed decoder configuration info Can be linked, grouped and alternative to other track, e.g, o multiple audio tracks for a movie for different language Z. Li Multimedia Communciation, Spring 2017 p.13
14 ISOBMFF sample Track sample: Represents timed data used by a decoder at a given time on the common media timeline o DTS: Decoding Time Stamp o CTS: Composition Time Stamp (display time) Sample Properties o Size, position, random access, decoder config Supports sub-samples o For e.g, slice, and tiles in HEVC May be associated into sample groups o Temporal scalable layers: all I frames, all B frames, e.g. Continuous samples maybe grouped into chunks, May have sample specific auxiliary info: o E.g, samples using the same crypto key. Z. Li Multimedia Communciation, Spring 2017 p.14
15 ISOBMFF Physical Structure - Boxes ISOBMFF is physically organized into boxes Byte based stream, no data is outside box Box Structure Box Header Length: 4~8 bytes Has 4 printable ascii characters, e.g, trak, mdat, moov, moof Hierarchical/Extensible Root is usually moov, or meta Unknown/undefined box can be skipped by application Z. Li Multimedia Communciation, Spring 2017 p.15
16 Important Boxes Typical media file (.mp4) file boxes Z. Li Multimedia Communciation, Spring 2017 p.16
17 MP4 box example 1-track media file timed data Z. Li Multimedia Communciation, Spring 2017 p.17
18 Untimed data example untimed data box structure, typical Z. Li Multimedia Communciation, Spring 2017 p.18
19 Separation of Meta data from Media Data Easy of access allowed Z. Li Multimedia Communciation, Spring 2017 p.19
20 Media Data Box Hierarchy Audio/Visual File Structure: Z. Li Multimedia Communciation, Spring 2017 p.20
21 Media Data Box (mdat) Unstructured, bag of bytes Need track info to access the byte range Data bytes are stored in one or more boxes of specific type Mainly mdat type box Some time idat for item data This part is compression specific storage of sample Bytes belong to the same sample (e.g, video frames) are stored continuously Sample can be organized into sample groups Continuous sample groups can be organized into chunks o Supports progressive downloads by interleaving chunks of audio/video data Item data storage Item and media data can be interleaved. Z. Li Multimedia Communciation, Spring 2017 p.21
22 ISOBMFF Open Source Tool MP4Box ParisTech/ENST To access media file: MP4Box diso foreman_320kpbs.mp4 It will have a.xml file dumped with all the box structure Z. Li Multimedia Communciation, Spring 2017 p.22
23 Fragmentation for Progressive Download Initial design only allow one moov box per file Have to wait for all frames to be written to save moov box Not good for progressive download. Introducing moof, movie fragments boxes Now can have multiple segments of moof + n traf (track fragmetns) Data still in mdat Z. Li Multimedia Communciation, Spring 2017 p.23
24 Fragmented ISOBMFF File Fragments structure: Initial moov box Seg 1 moof box Seg 2 moof box Z. Li Multimedia Communciation, Spring 2017 p.24
25 Hint Track Purpose Dedicated to interface with streaming protocols, e.g, RTP. To provide additional info to assist streaming protocol paketization process Linked to the media data track Examples: hint track for streaming MP4 using RTP, hint track for packetization for FLUTE (rateless erasure correction) Z. Li Multimedia Communciation, Spring 2017 p.25
26 ISOBMFF Media Timeline Boxes involved mdhd : gives the time scale, sample delta stts : provide Decode Time Stamp (DTS) for each sample ctts : provide Composition (display) Time Stamp (CTS) for each sample cslg : additional info for specific CTS/DTS configuration tfdt : time anchor for movie fragments trun : timing for movie fragmetns relative to tfdt stts / trun coding: DTS(0) = 0, DTS(k)=sum(sample_delta, 0, k-1) cts / trun coding: CTS = DTS + Composition offset Z. Li Multimedia Communciation, Spring 2017 p.26
27 Movie Timeline Mapping Track sample presentation time mapping Z. Li Multimedia Communciation, Spring 2017 p.27
28 Random Access Point (RAP) Support sync box If present, RAP are signaled at I frame, If absent, all samples are RAP, e.g, audio frames (20ms) Sample group rap : non-idr intra frames roll : signal n_bytes samples to decode until the next perfect reconstruction can be achieved. prol audio, n_bytes samples before the perfect reconstruction can achieve Independent and Disposable Samples Is_leading: for open GoP, only the first is I frame, the rest all P frames Sampel_depends_on: I frame or not Sample_has_redundancy: signal redundancy representation. tref : Track Reference Track n uses or refers to another track k Z. Li Multimedia Communciation, Spring 2017 p.28
29 ISOBMFF file types Plain File: Simple recording of plain media data, data first, header last mdat box, then moov box, e.g, foreman_320kbps_nf120.mp4 Progressive File: For progressive download or streaming Header first then media data Interleaved Chunks Fragmented File: Multiple moof segments followed by moov box Good for continous recording Segmented File: Self contained and playable fragments in signle file or in separate files For HTTP streaming (DASH) Tools: segment file, indexing Z. Li Multimedia Communciation, Spring 2017 p.29
30 Outline ReCap Lecture 14 MPEG File Format ISOBMFF/Mp4 MPEG DASH Dynamic Adaptive Streaming over HTTP Summary Z. Li Multimedia Communciation, Spring 2017 p.30
31 Internet Multimedia Protocol Stack Where is DASH? APPLICATION DASH HTTP Synchronization Service SIP RTSP RSVP RTCP Media encaps (H.264, MPEG-4) RTP Layer 5 (Session) KERNEL TCP DCCP IP Version 4, IP Version 6 UDP Layer 4 (Transport) Layer 3 (Network) AAL3/4 AAL5 MPLS Layer 2 (Link/MAC) ATM/Fiber Optics Ethernet/WiFi Z. Li Multimedia Communciation, Spring 2017 p.31
32 Challenges with Internet Video Delivery Video not accessible Video Behind firewall Plugins not available Bandwidth not sufficient Wrong and non-trust device Wrong format Low Quality of Experience Long start-up latency Frequent rebuffering Low playback quality No lip-sync 3 DoF in Video Delivery Problem Z. Li Multimedia Communciation, Spring 2017 p.32
33 DASH in a Nutshell Dynamic, Adaptive, Streaming over HTTP: An OTT solution HTTP De-facto Internet Transport Infrastructure Z. Li Multimedia Communciation, Spring 2017 p.33
34 DASH Key Features Imitation of Streaming via Short Downloads Downloads desired portion in small chunks to minimize bandwidth waste Enables monitoring consumption and tracking clients Adaptation to Dynamic Conditions and Device Capabilities Adapts to dynamic conditions anywhere on the path through the Internet and/or home network Adapts to display resolution, CPU and memory resources of the client Facilitates any device, anywhere, anytime paradigm Improved Quality of Experience (QoE) Enables faster start-up and seeking (compared to progressive download), and quicker buffer fills Reduces skips, freezes and stutters Use of HTTP de-facto Internet transport Well-understood naming/addressing approach, and authentication/authorization infrastructure Provides easy traversal for all kinds of middleboxes (e.g., NATs, firewalls) Enables cloud access, leverages existing HTTP caching infrastructure (Cheaper CDN costs) Z. Li Multimedia Communciation, Spring 2017 p.34
35 Rate Adaptation in DASH Multiple rate representation of content Different frame size Different quality Different bit rate Z. Li Multimedia Communciation, Spring 2017 p.35
36 Media Presentation Data Model MPD: a manifest of content available on HTTP server Accessible segments and their timing As a.xml file to be retrieved by clients at the start of DASH session Credits to figures on following slides: Christian and Ali, Over the Top Content Delivery: State of the Art and Challenges Ahead, ICME 2015 Tutorial Z. Li Multimedia Communciation, Spring 2017 p.36
37 DASH Temporal Model Playback time is broken up into periods Each periods has multiple adaptation sets Each adaptation sets has multiple representations/subrepresentations Iraj: DASH Tutorial Z. Li Multimedia Communciation, Spring 2017 p.37
38 DASH Representations A Representation: One of the alternative choices of the media content typically differing by encoding parameters such as, bitrate, resolution, language, codec,etc. Aligned within the period s boundaries. Consists of one or more Segments. o Contains an initialisation segment or all segments are self-initialising. May contain zero or more Sub-Representations. A Sub-Representation: Provide the ability for accessing a lower quality version of the Representation. Examples: Audio track in a multiplexed Representation. Lower frame rate for efficient fast-forward. Z. Li Multimedia Communciation, Spring 2017 p.38
39 DASH Segments A Segment is a unit that can be referenced by an HTTPURL included in the MPD. and optionally with a byte range. Segments availability duration: the time window at which the Segments can be accessed by the HTTP- URL. Each representation has at most one SegmentInfo element which provides: Presence or absence of Initialisation and Index Segment information. HTTP-URL and byte range for each segment. Segment availability start time and availability end time for live case. Approximated media start time and duration of each segment. Fixed or variable duration. Z. Li Multimedia Communciation, Spring 2017 p.39
40 Segment Initialization ISOBMFF based box represenation Z. Li Multimedia Communciation, Spring 2017 p.40
41 DASH Segment Indexing Provides information in ISO box structure on Z. Li Multimedia Communciation, Spring 2017 p.41
42 DASH Adaptation Scenario Client Driven Operation Client measure throughput, and retrieve the next segment that fits channel condition and display requirements Z. Li Multimedia Communciation, Spring 2017 p.42
43 DASH Scope What need to be specified? MPD the core of the DASH data formats Behavior of DASH is out of normative part, but part of implementation guideline and amendments. Z. Li Multimedia Communciation, Spring 2017 p.43
44 DASH standardization effort DASH technology source and history Z. Li Multimedia Communciation, Spring 2017 p.44
45 DASH Software Tools MP4Box DASH content preparation How to create MPD How to create media Segments/Sub-segments How to create Segment Index Example: o MP4Box -dash frag rap -segment-name mydash - subsegs-per-sidx 5 -url-template test.mp4 DASH.js javascript client Z. Li Multimedia Communciation, Spring 2017 p.45
46 Summary ISOBMFF File Formats (aka, MP4) An universal abstraction and access tool to audio/visual media files created by different compression technology Supports disk storage, over the network streaming. Very successful and basis for a variety of technology we use these days Logical design based on separating logical description from physical box structure DASH Addresses challenges in OTT video delivery Utilizing the de-facto Internet infrastructure, HTTP transport Adaptation through multiple rate representation Dynamically driven by client Content Pieces: MPD, Media Segments, Segment Index. Z. Li Multimedia Communciation, Spring 2017 p.46
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