FL012 Data chunk size is zero

    Data chunk size is zero #

    Problem ID Manufacturer Affected Firmware Fixed in firmware Affected Hardware Status
    FL012 Frontier Labs 3.01 N/A BAR? draft/unknown

    Related to FL003 and FL005, however it seems distinct since the files are.

    We’ve been given a sample of a file that is from a FL sensor but that has a data chunk value of 0. Additionally, the RIFF chunk size is 36.

    Otherwise the file seems to be fine - there seems to be valid samples right through the file (not typical of FL003 and it is a full-size file (158,535,680 bytes)).

    screenshot of header

    Note the value of the 0x00_00_00_24 (36) just after RIFF and the value 0x00_00_00_00 (0) just after data.

    Open questions:

    • Is this a variant of FL005?
      • I’ve not grouped it in because in theory FL005 has been fixed
      • and because data size was always 44 in that issue
    • Is this a one-off. So far we’ve seen no other reports of this oddity

    Status #

    Unknown: non-replicated problem

    Status with the vendor #

    Vendor has not been contacted

    Effects on common tools #

    Acoustic Workbench (Ecosounds, A2O) #

    Currently fail - ungracefully - to harvest files.

    Audacity #

    Fails to open the file

    AP/various R tools #

    Fail to read the files - after reading 0 for data chunk size the tools infer 0 samples and don’t/can’t process any data.

    ffmpeg/ffprobe #

    ffprobe can ignore the bad chunk size and estimate the duration of the file.

    sox does not report the duration.

    EMU #

    Emu has no support for this problem. Tracking issue: https://github.com/QutEcoacoustics/emu/issues/254

    Examples #

    No publicly available samples have been released. Please contribute.

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