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  1. JDK
  2. JDK-8107756

FXM/FLV fails on slow network / VPN


    • Type: Bug
    • Status: Closed
    • Priority: P2
    • Resolution: Cannot Reproduce
    • Affects Version/s: fx1.2.1
    • Fix Version/s: None
    • Component/s: javafx
    • Environment:

      Windows XP / Windows Vista


      Especially on windows fxm/flv Media creation fails during initialization on slow networks (or VPN) and causes a freeze of the whole application.

      The following video fails with a probability of 60% on a simulated 256kbit/s link (using Charles Debugging Proxy):

      The freeze may also happen on Mac, but with much lower probability.

      On Windows the thread hangs in _Open or _ndsGetDuration of the native directshow jmc plugin.

      The likeliness of a freeze correlates directly with the size of the first video tag in the FLV file. Other videos with even larger first keyframe had a chance of nearly 100% to fail. Adding a black frame at the beginning of the video (and therefore a much better compressable keyframe) lowers the fail rate to < 5%. It seems that the parse/decoder expects the first frame to be delivered in full with the first chunk of data.

      Dump of the first few frames:
      #1 Meta Tag (onMetaData): timestamp 0, size 355, data size 344
      #2 Video Tag (Keyframe): timestamp 0, size 20896, data size 20885
      #3 Audio Tag: timestamp 5, size 534, data size 523
      #4 Audio Tag: timestamp 31, size 847, data size 836
      #5 Video Tag (Interframe): timestamp 40, size 1240, data size 1229
      #6 Audio Tag: timestamp 57, size 534, data size 523
      #7 Video Tag (Interframe): timestamp 80, size 1560, data size 1549
      #8 Audio Tag: timestamp 83, size 534, data size 523

      With a black image the first Keyframe has a size of 71byte.

      MetaData / Tag Structure of video files with higher failure rate are available via email on request.




            • Assignee:
              vbaranovsunw Vyacheslav Baranov (Inactive)
              tbutterjfx Thomas Butter (Inactive)
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              • Created: