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Media Archive Status

Media Archive Status. 29/10/2007. Motivation. Summarise the past DV MOV 2 AVI conversion Recent data migration FLV external encoder Recent configuration changes Recent changes of the Media Archiver software Test of HD master format

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Media Archive Status

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  1. Media Archive Status 29/10/2007

  2. Motivation • Summarise the past • DV MOV 2 AVI conversion • Recent data migration • FLV external encoder • Recentconfigurationchanges • Recent changes of the Media Archiver software • Test of HD master format • Convince you that at presentMedia Archivecan growwithout active help from IT-IS • Discuss the future • Space requirements • WMV playback on CDS • FLV format on CDS • HD video master format

  3. Overview NB: No master file is encoded if Media Archiver cannot read its metadata

  4. 1.The Past

  5. DV MOV to AVI conversion • How to convert DV MOV files into DV AVI files • Impossible on a Mac? • Found, bought (~150 CHF) and tested: FireStore DV Conversion Suite • Converted 39 files provided • It’s been decided to keep both DV MOV and DV AVI files in the archive • Handed over to the Video team

  6. Video Data Migration 03.10.2007

  7. Recent configuration changes • New worker node dedicated to photos • Retry erroneous slave files after 4 hours instead of 1 day; abandon after 8 days: 8 days

  8. Recent changes in the Media Archiver software • Notify CDS only when all slave files are ready (complex – have to synchronise on master files to be sure of semantic correctness) • Implemented a “DFS offline” check • Support for external encoders

  9. FLV External Encoder • We’ve tested ffmpeg.exe to generate FLV videos: ffmpeg.mplayerhq.hu/download.html • Current statistics: 100% OK(the only 5 errors were related to bad master files) • IT-UDS has complete control over: • The version of ffmpeg used • How it is invoked • Generation logs

  10. Tests of HD master formats • We’ve looked at H.264 MPEG-4 codec (AVC) • We’ve decided it isstilltooearly

  11. 2.The Present

  12. Formats supported by Media Archiver

  13. Formats stored in Media Archive • Current funtional needs are satisfied

  14. Media Archive interventions IT-UDS • More spaceneeded • Media Archiver does not work according to specification • Metadata not present or not found • Bad master file IT-IS • Specification changes

  15. Current statistics • Photo: • ERROR 1737 • INSYNC 17425 • Audio: • INSYNC 543 • NEW 1 • Video: • BUSY 3 • ERROR 4 • INSYNC 563 • MSTRCHD 19

  16. 3.The future

  17. Space requirements in 2008

  18. WMV playback on CDS • Playback windows should be bigger • Higher resolution file should be used • Streaming server should be used instead of the HTTP serverhttp://it-multimedia.web.cern.ch/it-multimedia/test/webcast/templates/Artificial_Intelligence/test/default_CDS_WMV_vs_improved_WMV_4_3.htm

  19. FLV on CDS • Let’s see how it works:http://it-multimedia.web.cern.ch/it-multimedia/test/webcast/templates/Artificial_Intelligence/test/improved_WMV_vs_flash_4_3.htm • Implemented as external encoder, no support from IT-IS for the encoder

  20. External Encoder Requirements • It supports allcurrent (and future!) master formats • It is reliable: • Always works for valid files (and returns 0) • Returns non-zero for invalid files • Does not get stuck

  21. (Minor) problem with ffmpeg

  22. Future master format requirements • be supported and easy to read, • have good chances to stay supported and easy to read in the future, • be recognised by external customers of the archive: television companies (for video files) and newspapers and publishing houses (for photo files), • be the format in which the teams work and save their work, • be easy to process automatically with the available, well-supported tools

  23. H.264 requirements for WMV • directshowfilters needed: • mp4 splitter - takes the files and splits the video and audio into two • H.264 codec

  24. 4.Discussion

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