Mpeg4 conformance testing for digital video archiving
This presentation is the property of its rightful owner.
Sponsored Links
1 / 22

MPEG4 Conformance Testing For Digital Video Archiving PowerPoint PPT Presentation


  • 51 Views
  • Uploaded on
  • Presentation posted in: General

MPEG4 Conformance Testing For Digital Video Archiving. Max Gustashaw University of North Carolina-Chapel Hill Tyler Johnson University of North Carolina-Chapel Hill. Folkstreams.

Download Presentation

MPEG4 Conformance Testing For Digital Video Archiving

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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 !


Mpeg4 conformance testing for digital video archiving

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.


Mpeg4 conformance testing for digital video archiving

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


  • Login