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MPEG4 Conformance Testing For Digital Vi

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Information about MPEG4 Conformance Testing For Digital Vi
Entertainment

Published on December 12, 2008

Author: aSGuest6443

Source: authorstream.com

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MPEG4 Conformance Testing For Digital Video Archiving : MPEG4 Conformance Testing For Digital Video Archiving Max Gustashaw University of North Carolina-Chapel Hill Tyler Johnson University of North Carolina-Chapel Hill Folkstreams : Folkstreams Folkstreams.net is a national preserve of documentary films about American folk or roots culture. Produced by independent filmmakers, these hard-to-find films give voice to the arts and experience of diverse American groups. Folkstreams.net also encourages alternative forms of filmmaking about subjects neglected by mainstream corporate media. Folkstreams - streaming : Folkstreams - streaming Folkstreams.net makes these films easy to find and to see by video-streaming them on the Internet, and also provides in-depth and reliable contextual materials about the subjects and the filmmaking. They are streamed on the website together with background materials that highlight the history and aesthetic importance of the traditions and the films. Formats Employed : Formats Employed 16mm film original Digital Betacam Real QuickTime ASF MPEG4 General Goal For Digital Video Archiving : General Goal For Digital Video Archiving Ensure that original is preserved You can always go back to the original to make new distribution copies, right? Ensure that distribution (compressed) copies are preserved These are how the public accesses the data Anticipate that compressed formats will in many cases be the originals. Make sure that compressed video files are playable in 10-50 years Will the vendor be in business? Will the player even run? Are open source decoders available? Project Goal : Project Goal To determine which CODECs produce media files that are adhere to MPEG’s qualifications for the MPEG4 standard, and, by isolating the factors that affect these results, to highlight issues that may influence the strength of archival and distribution plans. MPEG4 Goal : MPEG4 Goal MPEG4 identified as a key format for compressed media Experience has shown commercial MPEG4 files are not inter-operable Test commercial encoders to see their level of standard compliance Learn more about the standard in order to better be able to advise the university as to archiving strategies for compressed media Method : Method Encode two test files using the target codec Analyze each resultant file using Mindego 4500 MPEG4 Analyzer Log errors Clips : Clips Born for Hard Luck Cowboy Poets Could not embed MPEG4 clips in this presentation because PowerPoint will not recognize our MPEG4 files. Codecs Used : Codecs Used 3ivx (3ivx) Compression Master (Popwire) Libavcodec MPEG4 (FFMPEG) MSMPEG4v2 (????????) QuickTime (Apple) Sorenson Squeeze (Sorenson Media) DivX (DivXNetworks ) 4Coder (envivio) Mindego 4500 Analyzer : Mindego 4500 Analyzer Deconstructs bit streams Tests for MPEG4 conformance- the standard Tests for conformance to industry profiles Currently supports ISMA Visual / macroblock analysis H.264 support planned Educational pricing available www.mindego.com Mindego Analyzer demo Results : Results Comments Minor errors Major errors * All codecs produced errors ! 3ivx : 3ivx Born for Hard Luck 2327 - Visual session size (320,240) does not comply with "Typical Visual Session Size" (176,144) for Simple Profile Level 1 2069 - Group of VOP or VOP start code not found Cowboy Poets 2327 - Visual session size (320,240) does not comply with "Typical Visual Session Size" (176,144) for Simple Profile Level 1 2069 - Group of VOP or VOP start code not found 2197 - Visual start code not found in the next byte aligned position. Compression Master : Compression Master BHFL Full analysis failed to run 2328 - Visual session size (320,240) does not comply with "Typical Visual Session Size" (352,288) for Simple Profile Level 2 2197 - Visual start code not found in the next byte aligned position. CP Full analysis failed to run 2328 - Visual session size (320,240) does not comply with "Typical Visual Session Size" (352,288) for Simple Profile Level 2 Demo encoder limited to 20 seconds Libavcodec MPEG4 (FFMPEG) : Libavcodec MPEG4 (FFMPEG) BFHL 2327 - Visual session size (320,240) does not comply with "Typical Visual Session Size" (176,144) for Simple Profile Level 1 2197 - Visual start code not found in the next byte aligned position. CP 2327 - Visual session size (320,240) does not comply with "Typical Visual Session Size" (176,144) for Simple Profile Level 1 2197 - Visual start code not found in the next byte aligned position. MSMPEG4v2 : MSMPEG4v2 BFHL Analyzer will not load file ‘Unknown stream type’ CP Analyzer will not load file ‘Unknown stream type’ QuickTime : QuickTime BFHL 2333 - Visual session size (320,240) does not comply with "Typical Visual Session Size" (352,288) for Advanced Simple Profile Level 3 2319 - Max video packet length found to be 10048 bits that exceeded the bound of 4096 bits for Advanced Simple Profile Level 3 2197 - Visual start code not found in the next byte aligned position. CP 2333 - Visual session size (320,240) does not comply with "Typical Visual Session Size" (352,288) for Advanced Simple Profile Level 3 2319 - Max video packet length found to be 10088 bits that exceeded the bound of 4096 bits for Advanced Simple Profile Level 3 2197 - Visual start code not found in the next byte aligned position. Sorenson Squeeze : Sorenson Squeeze BFHL 2329 - Visual session size (320,240) does not comply with "Typical Visual Session Size" (352,288) for Simple Profile Level 3 2197 - Visual start code not found in the next byte aligned position. CP 2329 - Visual session size (320,240) does not comply with "Typical Visual Session Size" (352,288) for Simple Profile Level 3 2197 - Visual start code not found in the next byte aligned position. DivX : DivX BFHL Analyzer will not load file ‘Unknown stream type’ CP 2034 - Reserved value used for coding VOL priority 2197 - Visual start code not found in the next byte aligned position. 2031 - Reserved value used for coding Video Object Type indication 2039 - Reserved value used for coding chroma format 2078 - Non-Rectangular Video not supported in the current version 2033 - Reserved value used for coding VOL version ID. 2047 - The marker bit after video object layer shape found to be zero. 2049 - The marker bit after vop_time_increment_resolution found to be zero. 2053 - The marker bit found to be zero after vol_width. 2128 - Marker bit found to be zero after vop_time_increment base. 2127 - Coded Value of vop_time_increment exceeds the value of vop_time_increment_resolution 2197 - Visual start code not found in the next byte aligned position. 2042 - The marker bit after latter_half_bitrate found to be zero. 2003 - Visual Object Start code not found 2072 - FGS not supported in this version 2163 - For MB No:22: Code not found in VLC table for cbpy 2051 - The marker bit after fixed vop time incrementis not equal to 1. 2132 - Forbidden value '0' found for vop_fcode_forward. 2195 - For MB No63: Code not found in VLC table for mb_type 2182 - For MB No:186, Block No:0: Code not found in VLC table for inter block envivio 4coder : envivio 4coder BFHL 2329 - Visual session size (320,240) does not comply with "Typical Visual Session Size" (352,288) for Simple Profile Level 3 2197 - Visual start code not found in the next byte aligned position CP 2033 - Reserved value used for VOL version ID 2197 - Visual start code not found in the next byte aligned position 2196 - Start code found from the next byte aligned position when reading from macroblock Conclusions : Conclusions MPEG4 is complicated Wary of industry alliances H.264 likely to be adopted widely because of VC and broadcast efficiency MPEG4 arbitrary shape and fancy encodings dependent on market demand Analyzer is a critical tool – can’t rely on interop Market competition goals can conflict with archival needs Commercial applications Purposefully non-standard to dominate the market Next Steps : Next Steps More comprehensive tests Need alternate conformance tool to verify results Make an archive plan MPEG4 Visual (part 2) has many profiles that must be specified / evaluated MPEG4 part 10 (H.264) has many profiles that must be specified / evaluated Get smarter, get wise

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