Hi all,

Just a note as I have been working with a customer in Argentina with a partial offline issue.  In this workflow, the customer is using our product to add proxy audio to existing audio only clips created by Media Composer 18.9.   The PAM status shows that the proxy audio is "partial offline" randomly for some clips.   What I have found is in the case where this occurs, the PCM sample count is always 1 audio sample less than the track duration.  Confirmed with AAF and MXF dump of the PCM MXF files.  material package is 30fps NDF.  Currently our software doesn't account for "padding" extra samples to feed AMT2 when building a proxy to account for source content being less than material metadata reflects.  Not sure if this is to be consider an issue with Media Composer audio only generation.  (math error somewhere?)  when it occurs, it's always 1 sample shy of what it needs to be to reflects the clip length in the material package.

Evaluating what's involved with trying to work around this on our end but thought I'd point it out.  I can provide the MXF files and AAF files for the client clips if needed.

(See bolded text below)

 [ SourceMob ]

 MobID: 060a2b340101010101010f00-13-000000-{ 5cbdd9e7-c8d8-0036-060e-2b347f7f2a80 }

 Name: "CS 190418 SPORTHUANCAYO VS MONTWANDERERS HL,Audio Mixdown,3"

 Slots: Strong Object Reference Array [1] of MobSlot

  kAAFTypeID_MobSlotStrongReferenceVector [0]: 

    [ TimelineMobSlot ]

    SlotID: 1

    SlotName: ""

    Segment: 

      [ Sequence ]

      DataDefinition: Sound

      Length: 41865824

      Components: Strong Object Reference Array [1] of Component

       kAAFTypeID_ComponentStrongReferenceVector [0]: 

         [ SourceClip ]

         DataDefinition: Sound

         Length: 41865824

         SourceID: 060a2b340101010101010f00-13-000000-{ 8f47bea9-2198-3c2b-8a95-f08f11cd5520 }

         SourceMobSlotID: 1

         StartTime: 0

    PhysicalTrackNumber: 369164801

    EditRate: { 48000/1 }

    Origin: 0

 LastModified: Apr 22, 2019 15:12:48.00 GMT

 CreationTime: Apr 22, 2019 15:12:39.00 GMT

 EssenceDescription: 

   [ PCMDescriptor ]

   SampleRate: { 48000/1 }

   Length: 41865823

   ContainerFormat: MXF

   QuantizationBits: 24

   Locked: False

   AudioSamplingRate: { 48000/1 }

   AudioRefLevel: -18

   ElectroSpatial: ElectroSpatialFormulation_SingleChannelMode

   Channels: 1

   AverageBPS: 144000

   BlockAlign: 3

   SequenceOffset: 0

   DialNorm: 27

Update to this issue. Resolved with editor update from 18.9 to 18.11.

We loaded Media Composer 18.11 at our facility - making the same length mix down clip with this newer editor version resovles the issue. THe duration in the audio descriptor is no longer less than the expected length.    Tested several known mixdown lengths that caused the issue with 18.9 and all are correct with 18.11.   Will advise customer to update editor version.

Rich