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roncaldier woho6146964
Participant
October 31, 2018
Question

black bar appeared on composition and footage – bug in cc2019?

  • October 31, 2018
  • 3 replies
  • 2922 views

Hi,

I've opened one of our projects today and saw there's a black bar visible on the bottom of every clip in our composition. It's visible in the original footage out of the project window as well.

The bar is not in the original footage and is not caused by accidentally moving the clips up. Tried realoading the footage already, no effect.

The weird thing is that AE apparently "sees" the black bar in the footage, since it's even effected by the Chroma Key (see picture attached).

Does anyone have an idea? I'd like to avoid having to scale all footage to get rid of the bar.

Thx in advance

bounding box handles

original footage


AE key light  "seeing" the black bar

This topic has been closed for replies.

3 replies

Impalaboy
Impalaboy
Inspiring
October 31, 2018

I have problems with half or all of the frame displaying upside down for one frame.

I thought it was only with 4k footage but it happened today with 1080 footage.

B
Community Expert
Byron CortezCommunity Expert
Community Expert
October 31, 2018

Take a screenshot of your effects panel and upload it.

Byron.
R
roncaldier woho6146964Author
Participant
November 1, 2018

Here you go. But it's not about any effects applied. It shows up in AE on the original footage, or when you delete all effects.

Wes Howell
Adobe Employee
Wes Howell
Adobe Employee
November 1, 2018

Does anything different happen if you rename the clip and reimport it?

Tim Kurkoski
Adobe Employee
Tim Kurkoski
Adobe Employee
October 31, 2018

What type of footage is this? Format and codec?

Can you provide a sample that I could look at?

Does the same problem happen when you open one of these clips in Premiere Pro or Adobe Media Encoder?

R
roncaldier woho6146964Author
Participant
November 1, 2018

It's footage from a Canon 5D, 1080p 24fps, H264

The black bars don't appear on the original footage if it's opened in another program. However AE shows the bars also on the original footage. The whole project had already been rendered out in Media Encoder and sent to the client. Up on reopening the project to make some adjustments – suddenly black bars.

By now i've cleared the cache, deinstalled and reinstalled AE. At first some of the black bars disappeared, but this morning I came back to the computer – black bars everywhere.

Here are 2 samples rendered out using ME, match source, high bitrate

Dropbox - example_1-2.zip

Tim Kurkoski
Adobe Employee
Tim Kurkoski
Adobe Employee
November 1, 2018

Thanks for sharing the samples.

Although this is moot now, I was requesting the original footage, not the version rendered out of After Effects, so I could test your footage on my machine. That said, I was able to find some similar footage from a Canon 5D and I can reproduce the problem.

tl;dr - This is a bug. Disable the "Enable hardware accelerated decoding" option in Preferences > Import. Restart After Effects, then purge the cache via Edit > Purge > All Memory & Disk Cache.

It appears that After Effects 16.0 (and Premiere Pro 13.0) are mis-sizing Canon 5D H.264 .mov footage when hardware-accelerated H.264 decoding is enabled on Mac. The bottom 128 pixels of the footage are black, and the footage is vertically scaled so that it fits within the cropped dimensions. In more concrete terms: a 1920x1080 frame renders vertically scaled (squished) to 1920x952, with the last 128 rows filled with black.

I do not reproduce this problem with any other H.264 footage, just the Canon 5D samples that I have. The same samples do not reproduce the problem in After Effects on Windows 10. Premiere Pro also appears to be affected by the problem as well (same technology; in Premiere Pro the hardware acceleration option is in Preferences > Media.) Note that the hardware acceleration option is only available on macOS 10.13 and later.

The problem goes away when you disable the hardware-accelerated decoding option, which is enabled by default. Note that you need to restart After Effects after turning this option on or off, and you should purge the cache after the restart, otherwise previously cached frames from that footage will be used.

I've filed the bug and asked our developers to investigate. Apologies for the disruption.

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