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Avid Quicktime Reference files

Posted: Fri Jun 05, 2015 7:44 am
by draldos
Hi there

Is there any way to get FFA to see and transcode to MP4 Avid Quicktime reference files? Which is a quicktime wrapper pointing to the media relatives within the avid Media files folder structure?

Thanks S

Re: Avid Quicktime Reference files

Posted: Sat Jun 06, 2015 3:32 pm
by admin
Actually, I don't know. I have yet to try any qt reference files on Windows. In the Processors/FFmpeg in the FFAStrans main folder you have a copy of ffmpeg.exe so you can try on your own. F.ex.:

ffmpeg.exe -i d:\your_video\ -an d:\out\qt_ref_ouput.mkv

If you then got video on your output file then I guess there's a big chance FFAStrans will be able to use you qt reference files as well.


Re: Avid Quicktime Reference files

Posted: Tue Mar 01, 2016 9:04 pm
by sonicmotion
I've never been able to get QT reference files to work with FFMPEG, that seems to be the limitation. You may try wrapping the ref file in a AVISynth file to see if that works?

Re: Avid Quicktime Reference files

Posted: Sun Mar 06, 2016 9:56 pm
by admin
I'm happy to announce that the upcoming FFAStrans 0.7.0 can easily be configured to transcode QuickTime reference files. Stay tuned for more info.


Re: Avid Quicktime Reference files

Posted: Tue Mar 08, 2016 8:30 pm
by admin
Here's how to set up FFAStrans 0.7.0 to transcode QuickTime reference files. Attached to this post you will find a package that contains an example workflow and a "Custom AviSynth-script"-preset to make it all happen. This example also demonstrate how the "Custom AviSynth-script"-node can act as a custom decoder: You may add a filter directly after, or a "A/V Media"-decoder for increased decoding reliability, or connect directly to an encoder.

Installation instructions:
1. Make sure you have no less than version 0.7.0 of FFAStrans installed
2. Install the QuickTime package from Apple:
3. Unpack the attached "QT-ref_example.7z" to your FFAStrans folder. Overwriting does not destroy your installation.
4. Insert your own paths in the "Folder" monitor and delivery node.

Please note that the importand node here is the "Custom AviSynth-script"-node with the "Add support for QT reference"-preset. The rest is just for creating a working example.

A big thank you must go to Tateu for creating the QTSource.dll!
Please visit for detailed info on how to use QTSource.

Please enjoy


Re: Avid Quicktime Reference files

Posted: Tue Aug 23, 2016 10:23 am
by vijm1972
Hi Steipal,

As per my understanding QT reference file is reference file to play source file. I am not sure about QTSource function.

If I used above attached example I am getting output as per my encoding setting. I am not able to to play my original hi-res source file using QTReference file.
I have attached media info of source file and QT reference file which I have created using FCP. If you compare both the media info's you will get all the parameters equivalent to each other. Only difference I have observed is file size and one line added in reference file which is source file location. If I play QTReference file created using FCP I am able to play source file.
Reference.jpg (231.12 KiB) Viewed 5886 times
Source path.jpg
Source path.jpg (125.17 KiB) Viewed 5886 times
Please correct me if I am missing anything.


Re: Avid Quicktime Reference files

Posted: Tue Aug 23, 2016 10:45 am
by admin
The QTSource function is needed to read QT reference files. It uses the QuickTime SDK to open the files, that's why you need to install QuickTime from Apple. FFmpeg cannot do this by itself, that's why QT reference files requires special treatment, because they are special.

Now, I'm not sure I quite understand what your post actually is about because the way I understand it, the workflow does what's expected. Is that right? Also, you seem to have a playback problem with our QT reference files?