Re: [Avid-L2] Re: Exception: DecompStream::FillBuffer FIFO too small for read

If anyone's following this thread, the issue was explained to the
photographer by Nanoflash manufacturer:

> Avid uses our files just fine, if you follow the following rules.
>
>
>
> 1. Use MXF not MOV (Quicktime).
>
>
>
> 2. Use Long-GOP if recording 18/35/50 Mbps.
>
>
>
> 3. Use I-Frame Only if recording above 50 Mbps.
>
>
>
> All bit-rates work, when using I-Frame Only.
>
>
>
> We try to tell everyone these rules and it is probably in our manual.
>
>
>
> We have been waiting for a long time for Avid to increase the size
> of their internal buffer.
>
>
>
> The problem is that their buffer is too small to hold a whole Long-
> GOP, if the bit-rate is above 50 Mbps.
>
>
>
> When the editing or playback stops, Avid looks in the internal
> buffer for the start of the GOP. If using above 50 Mbps, they can't
> find the first frame of the GOP, resulting in the
> "decompStream:FillBuffer FIFO too small for read )," error.
>
>
>

So, when using nanoflash XDCam codec, stick with 50Mbps for now, or
use all i-frame, until Avid and the Nanoflash guys get this sorted
out. I was able to use .mov via ama with identical results to
the .mxf, for what it's worth, but in the end, transcoding to DNx was
the only way to make the footage useable. Except, of course, the
nanoflash is often used in conjunction with the on-board HDCam
recorder - consequently there's a backup tape! This is a great hybrid
workflow for people who want a tape element AND file-based workflow.

gh
----------------------------------------------------
Greg Huson
Secret Headquarters, Inc
Post Production / Production
Culver City, CA
323 677 2092
323 677 2096 F
www.DigitalServiceStation.com
greg (at) SecretHQ.com
www.SecretHQ.com

On Jun 29, 2010, at 2:41 PM, Greg Huson wrote:

> Seems to work to transcode to DNx as well, just not XDCam MXF.
>
> gh
> ----------------------------------------------------
> Greg Huson
> Secret Headquarters, Inc
> Post Production / Production
> Culver City, CA
> 323 677 2092
> 323 677 2096 F
> www.DigitalServiceStation.com
> greg (at) SecretHQ.com
> www.SecretHQ.com
>
>
>
> On Jun 29, 2010, at 2:08 PM, Andres wrote:
>
>> We got this error after importing some mxf files that had been
>> recorded on a NanoFlash. They would play in the source window and on
>> a timeline, but as soon as you stopped playing the screen would go
>> black and the error would pop up. Turns out that the shooter had set
>> the NanoFlash to record at 140Mbps. Avid only supports up to 50Mbps
>> long-GOP (which is what we had asked for). Luckily we could string
>> out a timeline and lay off to hdcam for redigitizing. Hope this
>> helps, Andres
>>
>> --- In Avid-L2@yahoogroups.com, Greg Huson <Greg@...> wrote:
>>>
>>> Anyone having this problem?
>>>
>>> I have a rush job (Sunday morning!) that's all shot XDCam 50 - but
>>> wrapped in QT, so I'm using AMA. If I transcode them with a 'rewrap'
>>> - leaving them XDCam, but making them MXF, I get the exact same
>>> problem. Some clips play, some dont - most play fine as long as you
>>> start them in a place where the error warning doesn't show up - then
>>> they'll play right though the area where they wouldn't play. I cut
>>> together a rough sequence with just audio, then, when I went to
>>> transcode JUST that sequence to MXF, it doesn't transcode,
>> throwing up
>>> the same error.
>>>
>>> (Ironically I have a back up source on HDCam tape, but the XDCam was
>>> supposed to save me time! Crap- I should of just captured!)
>>>
>>> Obviously this is V5 since it's QT AMA. Tried it on two different
>>> machines with identical results.
>>>
>>> Anyone have a solution, or at least seen this before? I'm
>> transcoding
>>> all the source in one room, will capture the HDCam in another, in
>> case
>>> the transcode fails. But wasn't all this supposed to make our work
>>> faster, not harder?
>>>
>>> gh
>>> ----------------------------------------------------
>>> Greg Huson
>>> Secret Headquarters, Inc
>>> Post Production / Production
>>> Culver City, CA
>>> 323 677 2092
>>> 323 677 2096 F
>>> www.DigitalServiceStation.com
>>> greg (at) SecretHQ.com
>>> www.SecretHQ.com
>>>
>>>
>>>
>>>
>>>
>>> [Non-text portions of this message have been removed]
>>>
>>
>>
>>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
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>
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>
>
>

[Non-text portions of this message have been removed]

------------------------------------

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