Sunday, December 22, 2013

[Avid-L2] Re: QT Ref Export Errors with mixed frame rate and ama?

 

I did relink all the clips in the bin but perhaps my decompose bin doesn't actually contain all the clips. This particular episode has been a complete cluster flop on the ingest side. I was told everything was online and transcoded but then I found they had in some cases consolidated some prores .movs on their 6.5 stations which looked and were online to them but when they came to my 5.5.3.7 SNDX the prores errored as an unrecognized compression and the clips were offline. Given that happened I wouldn't be surprised if the clicked consolidate instead of transcode and some of the other clips that were ama'd. Just a guess but sounds plausible.

If they ama linked to some 23.98 Canon files, not sure if they were 5D or not, would Avid let them consolidate those files. I thought that Avid in a 1080i/59.94 requires those ama clips to be transcoded adding pull down as long as Avid recognized or was set to the proper field motion on the clips. Just guess if they consolidated those some how without a transcode frame rate conversion that might explain some of the whackyness I'm seeing. This is just speculation and nothing I have had a chance to test or try. This damn air date is getting in the way of the fun research I could be doing.

--- In Avid-L2@yahoogroups.com, Mark Spano <cutandcover@...> wrote:
>
> If an AMA linked clip in sequence has gone offline, it will show up red
> just like any other offline clip. You must relink to AMA the original clip
> in bin. Sometimes it's as easy as just opening the bin. Other times, it
> must be right-click/RElink to AMA Files. If you see the media, but the clip
> shows as offline, well that's just MC being MC, knowing where to find media
> to play the clip, but not knowing it's actually online. You'll still get
> the error message about clips being offline, and if you relink them in the
> bin, the red will go away.
>
> If I'm doing QT Ref export from a sequence where I know AMA has been used,
> I transcode the sequence (to convert both AMA video and associated audio)
> and then I usually drop a safe color and mix that down. A video mixdown for
> a QT Ref export is usually a must. Audio mixdowns are also a must if there
> is multiple bit rate / sample rate stuff happening, because if there is,
> you will get twice or three times as many audio tracks in the ref export as
> what is in the sequence (each track in the ref export can only contain one
> bit rate and sample rate).
>
>
> On Sat, Dec 21, 2013 at 10:36 PM, johnrobmoore <bigfish@...> wrote:
>
> >
> >
> > I got to thinking. If a clip was ama'd and transcoded to DNX220 for my
> > online sequence. If I have the graphics reel up that has the original .mov
> > that was ama'd might Avid revert to an ama link for that clip. I have
> > repeatedly relinked my sequence to my dedicated avid media drives so I
> > would think the sequence would not regress to an ama link to a clip that
> > had been transcoded but I seem to be chasing ama ghosts. BOOOOOO I'm the
> > ghost of ama here to mess with you!!!! Very scary.
> >
> >
> > --- In Avid-L2@yahoogroups.com, John Moore <bigfish@> wrote:
> > >
> > > I'm aware of issues with mixed frame rates and ama linked clips when
> > trying to do QT Ref Exports. Our new season is finally HD and they shot
> > primarily DVCProHD on tape. There are some 23.98 clips from Cannon 5 D and
> > the like. The AEs also used ama linking to transcode several .movs etc.
> > The AEs are on 6.5.4 and I'm onlining on 5.5.3.7, haven't got around to
> > 5.5.4 yet. I put a safe color limit on an upper track below the title
> > tracks. This has always acted a lot like a mixdown.
> > >
> > > I exported a 5 minute trailer as a QT ref export the other day with no
> > issues just like our usual workflow in SD. That trailer is also the first
> > 5 minutes of the trailer. Now when I go to do a QT ref export of the
> > entire show I get a prompt about mixed rates and that I need to mixdown the
> > audio. I'm using QT ref to maintain the 4 tracks of audio. If I do check
> > the audio mixdown then it tells me I have ama linked clips in the sequence
> > and it won't export. To my knowledge I have no ama linked clips in the
> > show. They were ama linked and transcoded as far as I know and I'm on a
> > San so I'm on a different computer than the AEs so I don't believe I could
> > have any links to media on my desktop. I tried showing reference files and
> > sorting my clip type column to see if ama clips would get sorted so I could
> > see them. The sequence is also showing me offline red clips that are in
> > fact online and the media shows up yet the offline red color is on the
> > > clip. I also get prompted that there is offline media in the sequence
> > when I digital cut but as far as I can tell there is nothing offline.
> > Perhaps Avid sees the whacky clips that have media but show red offline
> > color as still offline under the hood. I wonder if that might also make
> > avid think the clips are ama media when in fact they are transcoded media.
> > >
> > >
> > > I've also discovered that the AEs sometimes miss checked the transcode
> > dialogue and things were consolidated not transcoded. I only discovered
> > this when things showed up offline and error saying unrecognized
> > compression type were happening. I went to the AE station, which is 6.5.4,
> > and saw that the clips were prores. This is why I think they just didn't
> > notice they were consolidating and not transcoding.
> > >
> > >
> > > I'm going to just do a video mixdown but I'm curious what happened
> > different to the file based media that didn't happen on the short trailer.
> > I think the consolidation error might have effect the episode but not the
> > trailer. This is been a bear to sort out. Pretty sure the video mixdown
> > will work but does anybody have some tips on digging out potential ama
> > clips that think they are ama in error. Maybe there is a nest that isn't
> > showing offline and why are online clips colored offline Red, and yes I
> > checked the clip color is not set to Red. Any suggestions appreciate. I'm
> > hoping Bob Z's shotgun is in the mail for Xmas I might have to go AE ama
> > hunting, in that order.
> > >
> > >
> > > John Moore
> > > Barking Trout Productions
> > > Studio City, CA
> > > bigfish@
> > >
> >
> >
> >
>

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