This is an interesting one that got us scratching our heads yesterday. It also looks like we're not the only people who have noticed this strange bug in Final Cut Pro X.

Maybe it is because we come from an analogue editing background many years ago when tapes used to be rejected for bad blanking errors, but we watch the edge of video frames like hawks.

So image our surprise when we saw that pixels were being lost on either side of the frame when a transition was applied. This doesn't happen with all effects in FCPX, just some of the ones that are written in Motion5. We saw the problem when testing out a new transition with 720x576 anamorphic footage, it doesn't appear when using media that has square pixels. Other people have noticed the FCPX bug too.

It is particularly noticeable as the outgoing video stays behind the incoming video until the end of the transition. That results in an edge and the incoming video popping back to its original size.

We thought it was an error in some of the coordinates and maths in the custom transition, not so as you can reproduce the problem with one of Apple's built in effects.

Take a look at a split screen between two anamorphic timelines, the top half is during the transition and the bottom half is after the transition. The transition used is 'Squares' which can be found in the object listing in transitions.


You can clearly see that pixels are missing off the right and left hand sides. Using fit or passing the footage through Compressor to add the anamorphic flag gives the same result.

We are running FCPX 10.0.1, Motion 5.0.1 and the latest version of Snow Leopard. We don't know if this bug was present in the first version of FCPX, but we do hope it'll be fixed in the next update.

The best way to report bugs to Apple is to use their feedback page.

Written by
Top BloggerThought Leader

I am the Editor-in-Chief of FCP.co and have run the website since its inception ten years ago.

I have also worked as a broadcast and corporate editor for over 30 years, starting on one inch tape, working through many formats, right up to today's NLEs.

Under the name Idustrial Revolution, I have written and sold plugins for Final Cut Pro for 13 years.

I was made a Freeman of Lichfield through The Worshipful Company of Smiths (established 1601). Though I haven't yet tried to herd a flock of sheep through the city centre!

Current Editing

great house giveaway 2020

2020 has been busy, the beginning of the year was finishing off a new property series (cut on FCP) for Channel 4 called The Great House Giveaway. I also designed and built the majority of the graphics as Motion templates. It has been a great success and the shows grabbed more viewers in the 4pm weekday slot than any previous strand. It has been recommissioned by C4 for 60 episodes, including prime-time versions and five themed programmes. The shows have also been nominated for a 2021 BAFTA.

Tour de france 2020
Although both were postponed to later in the year, I worked again on ITV's coverage of the Tour de France and La Vuelta. 2020 was my 25th year of editing the TdF and my 20th year as lead editor. The Tour was the first broadcast show to adopt FCPX working for multiple editors on shared storage.


BBC snooker the crucible

BBC's Snooker has played a big part in my life, I've been editing tournament coverage since 1997. I'm proud to be part of a very creative team that has pioneered many new ideas and workflows that are now industry standard in sports' production. This is currently an Adobe Premiere edit.

amazon kindle BF

Covid cancelled some of the regular corporate events that I edit such as trade shows & events. I was lucky however to edit, from home, on projects for Amazon Kindle, Amazon Black Friday, Mastercard and very proud to have helped local charitable trust Kendall & Wall secure lottery funding.

As for software, my weapon of choice is Final Cut Pro and Motion, but I also have a good knowledge and broadcast credits with Adobe Premiere Pro, MOGRT design and Photoshop.

Plugin Design & Development

I'm the creative force behind Idustrial Revolution, one of the oldest Final Cut Pro plugin developers. It hosts a range of commercial and free plugins on the site. One free plugin was downloaded over a thousand times within 24 hours of release.

I also take on custom work, whether it is adapting an existing plugin for a special use or designing new plugins for clients from scratch. Having a good knowledge of editing allows me to build-in flexibility and more importantly, usability.


Now in its 10th year and 4th redesign, running FCP.co has given me knowledge on how to run a large CMS- you are currently reading my bio from the database! Although it sounds corny, I am pretty well up on social media trends & techniques, especially in the video sector. The recent Covid restrictions has enabled live FCP.co shows online. This involves managing a Zoom Webinar through Restream.io to YouTube and Facebook. 

The Future

I'm always open to new ideas and opportunities, so please get in touch at editor (at) fcp.co. I've judged film competitions, presented workflow techniques to international audiences and come up with ideas for TV shows and software programs!


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