[olug] FTP question

Dan Linder dan at linder.org
Fri Jun 15 03:17:07 UTC 2012

I agree with Kevin - streaming wouldn't save any noticeable time and any
interruption would be ignored or captured and the only option would be to
re-send the stream.

Can you talk him through using something like 7zip, rar, or simply split to
break it into smaller chunks?  I don't expect compression to do much, but
the smaller chunks will allow you to resume sending and at worst only loose
the last partial file.  (I know that some FTP clients support resuming, but
I've had it fail on me a few times sending large DVD images so I only use
it as a last resort.)

Assuming you're trying to send "bigfile.mpeg", then the syntax in each
would be:
    split --verbose -b 100MB bigfile.mpeg  bigfile.mpeg.
produces 100MB files named "bigfile.mpeg.aa" through "bigfile.mpeg.zz"
To recombine, run "cat bigfile.mpeg.?? > bigfile.mpeg"
To check for errors, on the SOURCE side, run
    md5sum bigfile.mpeg.* > bigfile.mpeg.md5sum
Then to check, run
    md5sum -c bigfile.mpeg.md5sum
..and watch for any errors.

    rar a -v102400k bigfile.mpeg.rar bigfile.mpeg
produces 100MB files named bigfile.mpeg.part01.rar through
To recombine run
    rar x bigfile.mpeg.part01.rar
This will check the validity and report which rar file was corrupted so
they can re-send.

    7z a -v100m bigfile.mpeg.7z bigfile.mpeg
produces 100MB files named "bigfile.mpeg.7z.001" through
To recombine run
    7z x bigfile.mpeg.7z.001
It too will check for errors and tell you if the archive failed.


On Thu, Jun 14, 2012 at 9:17 AM, Joseph Gulizia <joseph.gulizia at gmail.com>wrote:

> I have a person sending a large video file using FTP from Eastern Europe to
> the Midwest.  It takes him anywhere from 2 hours 15 minutes for an MPEG-4
> one hour long video to 4 hours 22 minutes for an hour long MP2 video.
> Can streaming the file be a better solution (given the fact that the stream
> could be lost...and have to be re-sent) OR is there a way to get the file
> quicker....what could tracing the route do as far as finding the lagging
> points...what program would you recommend?
> I've looked at VLC and that is real-time for the streaming.
> Looking for something quicker if possible
> Regards,
> Joe
> _______________________________________________
> OLUG mailing list
> OLUG at olug.org
> https://lists.olug.org/mailman/listinfo/olug

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