Motion tracking much slower with match "Keyframe" than "Previous Frame" #53344

New Issue

Paulo José Oliveira Amaro · 2017-11-18T18:14:55+01:00

2017-11-18 18:14:55 +01:00

System Information
Ubuntu 17.10 - Intel Integrated Graphics

Blender Version
Broken: 2.79

Short description of error
Motion track performance is much slower using match "Keyframe" than "Previous Frame". The tracking speed starts normal, but soon it starts slowing down, and the performance decrease is so much that tracking becomes impossible (with just 1 tracking mark). It's like the video has to seek for and backwards at each frame, and disc I/O becomes a bottleneck, slower the more distant the keyframe and current frame are apart.

It looks very similar to #51850, but my video is just a common 1080p h264 mp4. The issue doesn't happen with match "Previous Frame" selected, only "Keyframe". Maybe it's a regression.

Exact steps for others to reproduce the error

Open a long enough video in Motion Tracking editor
Insert a track with match "Keyframe" option and start tracking

Below it is video showing the issue. Note in the tooltip the "Time remaining" value growing linearly with match "Keyframe" (indicating the tracking speed slowing down) and not with "Previous Frame":
bug.mp4

Here's a example .mp4 files that causes the issue: https://photos.app.goo.gl/LNWD98v2JyVWQ8k32

**System Information** Ubuntu 17.10 - Intel Integrated Graphics **Blender Version** Broken: 2.79 **Short description of error** Motion track performance is much slower using match "Keyframe" than "Previous Frame". The tracking speed starts normal, but soon it starts slowing down, and the performance decrease is so much that tracking becomes impossible (with just 1 tracking mark). It's like the video has to seek for and backwards at each frame, and disc I/O becomes a bottleneck, slower the more distant the keyframe and current frame are apart. It looks very similar to #51850, but my video is just a common 1080p h264 mp4. The issue doesn't happen with match "Previous Frame" selected, only "Keyframe". Maybe it's a regression. **Exact steps for others to reproduce the error** - Open a long enough video in Motion Tracking editor - Insert a track with match "Keyframe" option and start tracking Below it is video showing the issue. Note in the tooltip the "Time remaining" value growing linearly with match "Keyframe" (indicating the tracking speed slowing down) and not with "Previous Frame": [bug.mp4](https://archive.blender.org/developer/F1156082/bug.mp4) Here's a example .mp4 files that causes the issue: https://photos.app.goo.gl/LNWD98v2JyVWQ8k32

Paulo José Oliveira Amaro commented

2017-11-18 18:14:55 +01:00

Changed status to: 'Open'