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Elaskanator
Elaskanator
Known Participant
September 17, 2018
Question

After Effects choking on footage over 4K (5.7K equirectangular 360)

  • September 17, 2018
  • 2 replies
  • 560 views

Whenever I try working with such footage, I have to wait about 3 minutes between nearly every operation:

  1. Opening a project containing such footage - unresponsive
  2. Importing such footage - unresponsive
  3. Anything that causes a full frame redraw (e.g. scrubbing) - I can scrub around but the video preview is outdated for a long time with the preview render progress indicator inactive
    1. Even with preview downscaling at quarter (or a custom lower value like eighth)
    2. Changing preview downscaling is nearly instant, however
  4. Everything in the Adobe Media Encoder - unresponsive
    1. Although this is how it generally behaves with any footage, even 720p

There is no issue working with 4K footage, nor even 4000x3000 image sequences.

I can playback this video in realtime with no problem in other applications.

I've tested that it's not a hard drive bottleneck by using my NVMe drive (3 GB/s read), my RAM usage is not overwhelmed (32GB DDR4-3200), my CPU is nearly idle (Ryzen 1800X 8 core@3.6 GHz), and my GPU is also idle (nVidia 980TI w/6GB VRAM).

What might be causing my issues? It is driving me bonkers trying to process my footage.

This topic has been closed for replies.

2 replies

Elaskanator
ElaskanatorAuthor
Known Participant
September 17, 2018

Video codec, from stitching using the Yi 360 Studio (camera on Amazon):

Format                                   : MPEG-4

Format profile                           : Base Media

Codec ID                                 : isom (isom/iso2/avc1/mp41)

File size                                : 6.02 GiB

Duration                                 : 3 min 32 s

Overall bit rate                         : 243 Mb/s

Writing application                      : Lavf57.61.100

Video

ID                                       : 1

Format                                   : AVC

Format/Info                              : Advanced Video Codec

Format profile                           : High@L5.2

Format settings                          : CABAC / 4 Ref Frames

Format settings, CABAC                   : Yes

Format settings, ReFrames                : 4 frames

Codec ID                                 : avc1

Codec ID/Info                            : Advanced Video Coding

Duration                                 : 3 min 32 s

Bit rate                                 : 243 Mb/s

Width                                    : 5 760 pixels

Height                                   : 2 880 pixels

Display aspect ratio                     : 2.000

Frame rate mode                          : Constant

Frame rate                               : 29.970 (30000/1001) FPS

Color space                              : YUV

Chroma subsampling                       : 4:2:0

Bit depth                                : 8 bits

Scan type                                : Progressive

Bits/(Pixel*Frame)                       : 0.489

Stream size                              : 6.02 GiB (100%)

Codec configuration box                  : avcC

R
Community Expert
Rick GerardCommunity Expert
Community Expert
September 17, 2018

That MPEG format is going to put an awful lot of pressure on your CPU to decode. Every 4 frames are going to have to be created by calculations from the reference frames at each end of the sequence. Try loading the footage into the AME and render it to a standard Mezzanine (production) format or a tiff image sequence. AE should handle the footage much better if each frame contains all of the pixel info in the image.

R
Community Expert
Rick GerardCommunity Expert
Community Expert
September 17, 2018

My first guess is that it's the video codec used for the footage. Try rendering the footage to a frame based production format or an image sequence. I have been running some tests on various types of professional video formats and find that some playback in PPro just fine and others are terrible, even though the data rate for the footage is almost identical. In a couple of cases footage with nearly double the data rate plays back just fine when the same frame size and frame rate footage with a different codec and half the data rate stutters and skips frames.

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