Latest post Mon, Jan 26 2015 6:03 PM by mark.burton. 4 replies.
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  • Fri, Jan 23 2015 1:55 PM

    • mark.burton
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    Downloaded WAV files had audio glitches not on the originals that were uploaded

    The other day we completed a temp mix and the theatre uploaded the 6 track package to us via Aspera (Faspex). After we downloaded the files we found that 2 or the tracks contained small audio 'glitches', effectivly split second high level hiss. It was completly random and in total there were only about 6 glitches over these 2 tracks, but it rendered the files unusable.

    Of course our first reaction was that this was an issue that happened when the files were created, but they had gone through a proper QC the other end and when the theatre checked their original files they were all fine.

    So has anyone seen this before where a WAV file can take on this kind of audio issue after a file upload and download, especially via Aspera which we use daily to send WAV's all over the place and never had this and and similar issue before?

    Very strange and I wish we knew why it had happaned so we can avoid in future.

  • Fri, Jan 23 2015 2:31 PM In reply to

    Re: Downloaded WAV files had audio glitches not on the originals that were uploaded

    It likely happened in the data transmission.  A lot of high-speed large file delivery providers use UDP rather than TCP/IP for sending large packets of files fast.  the upside is UDP is a lot faster than TCP/IP, the downside is it doesn't contain the same error checking that TCP/IP uses.

    Did you try a re-send to see if the second pass was better than the first?

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  • Fri, Jan 23 2015 4:19 PM In reply to

    • Mark
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    Re: Downloaded WAV files had audio glitches not on the originals that were uploaded

    FunkyDragon:
    try a re-send to see if the second pass was better than the first

    +1

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  • Sun, Jan 25 2015 7:21 PM In reply to

    • mark.burton
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    Re: Downloaded WAV files had audio glitches not on the originals that were uploaded

    We were under the cosh at the time, so we simply had them send us each track indivually via WeTransfer, vowing to look into it later. But we also downloaded a set of DME stems from the same sender on the same day and those were fine.

    Thanks for the info about UDP and how Aspera transfers files, that certainly seems to make sense as to where the problem was introduced.

    It must just have been bad luck though as we use the same Faspex group to send and recieve multiple WAV files, as well as lots of the other file types, every day. We must send and receieve up to 100 WAV's a week and have never had this issue going either way.

    Would Zipping or DMG'ing the files make any difference in protecting them from this issue, or is it all irelevant as the file is simply being broken up for transfer in a way that belies any 'protection' they may have at Desktop level?

  • Mon, Jan 26 2015 6:03 PM In reply to

    • mark.burton
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    • Joined on Thu, Oct 13 2005
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    Re: Downloaded WAV files had audio glitches not on the originals that were uploaded

    Talking to another collegue he thinks zipping would help as if the file did corrupt in any way the ZIP would not open and we would know it was damaged.

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