Video Upload/Transcode Issues

A small number of agencies are experiencing issues when uploading Videos to CopyCentral. When upload has completed the user receives an email stating that transcode has failed. Additionally the video within CopyCentral submission is clearly marked.

CopyCentral checks that all upload video files (Rough-Cuts and TVCs) adhere to the published specification for CopyCentral. This is to eliminate delays in the clearance process where the file may fail due to its format. We want to ensure that if a file isn't valid it is refused at the earliest possible point. On Monday 20th July we introduced a small change to CopyCentral that ensured adherence to the specification. This blocked the upload of progressive files which have never met the CopyCentral Digital File Specification. 

Please see the article on CopyCentral Digital File Specification Guide.


Clearcast recommend that if you have issues then upload the broadcast delivery master to your submission. Whilst these are larger in size, they will be accepted since they will be of the correct resolution, codec and will be interlaced top-field first. Additionally you wont have to produce a separate version of the file just for copy clearance.


I can't get any files to upload successfully to CopyCentral, what can i do?

If you are unable to produce a file that CopyCentral will accept please try the following steps:

  1. Check your encoder/transcoder configuration against the CopyCentral Digital File Specification.
  2. Analyse the file with a professional digital video analysis tool to check adherence to the digital file specification. See section below on Analysing Files.
  3. Send an email to explaining the problem and providing a download link to the file in question. One of the support team will analyse the file and provide some guidance on what is wrong.


Analysing Files

There are a number of companies who have applications which can analyse digital files and report on various aspects of the video, audio and container formats. Some software only reports the meta-data written in the rather than actually analysing the Video and Audio itself. A good example is MediaInfo. When choosing an analyser you need to ensure that it can analyse the base-band video.

Clearcast use VidChecker-Post ( which can be used to analyse a file and provide a report. 

The template we use to check files is available for download here. This can be imported via the Admin Page on VidChecker.



There is a large number of different pieces of software that can export or transcode videos that meet one of the CopyCentral Specification formats. Clearcast have tested some of these to see if they can convert progressive video into interlaced top-field first, results are below:



Compressor (MAC)

Compressor can correctly convert a progressive source to interlaced. Please see the digital file specification guide for information on how to configure this.

Use of this with the correct settings will produce a file that CopyCentral will accept.



Sorenson Squeeze

We use Sorenson Squeeze at Clearcast for converting files. It can't produce every format available within the specification but it is able to produce a version that will be accepted by CopyCentral. By default Squeeze applies a global de-interlace filter which results on all output being progressive. This must be disabled which can be done by going to Preferences in the Edit menu, selecting the Advanced tab and ensuring that either "Auto Crop Deinterlace"  is not selected in the Filter drop down or "Automatically apply a global filter to every compression" is not checked.

Sorenson Squeeze can produce an file that can be uploaded to CopyCentral.

A preset is attached at the bottom of this page.


MPEG StreamClip

We tested version 1.2 but weren't able to produce an interlaced file from a progressive source.

Clearcast do not recommend using free or open-source software to encode videos for any professional purpose including for copy clearance.





Powered by Zendesk