Bug with tracking on movie files #37853

New Issue

Petrone Flavius · 2013-12-18T11:46:58+01:00

Petrone Flavius commented

2013-12-18 11:46:58 +01:00

System Information
OS X Mavericks 10.9, 3770K, 16 GB and 680 GTX

Blender Version
Broken: Stable OS X 64bit Blender 2.69 r60991 also latest build by the time of this report.

Short description of error
When loading a movie(mp4,mov,etc.) file as a source for tracking, while tracking it will skip and/or miss frames that are loaded. Also the cached frames are wrong too.
This makes some tracking points jumping around and continuing in the wrong order by 1 or 2 frames also the next frame ACCURACY is disrupted by this!

Exact steps for others to reproduce the error
Load a movie file into tracking, track some points and go with ALT+arrow while tracking. AFTER the first track, jump around the timeline so that frames load, then go back and look at the result by playing it back. Some frames will not be correctly loaded regarding the tracking data.

SEQUENCE FILES LIKE PNG,JPG,ETC.. ARE NOT AFFECTED !

**System Information** OS X Mavericks 10.9, 3770K, 16 GB and 680 GTX **Blender Version** Broken: Stable OS X 64bit Blender 2.69 r60991 also latest build by the time of this report. **Short description of error** When loading a movie(mp4,mov,etc.) file as a source for tracking, while tracking it will skip and/or miss frames that are loaded. Also the cached frames are wrong too. This makes some tracking points jumping around and continuing in the wrong order by 1 or 2 frames also the next frame ACCURACY is disrupted by this! **Exact steps for others to reproduce the error** Load a movie file into tracking, track some points and go with ALT+arrow while tracking. AFTER the first track, jump around the timeline so that frames load, then go back and look at the result by playing it back. Some frames will not be correctly loaded regarding the tracking data. SEQUENCE FILES LIKE PNG,JPG,ETC.. ARE NOT AFFECTED !

Petrone Flavius commented

2013-12-18 11:46:58 +01:00

Changed status to: 'Open'

Petrone Flavius commented

2013-12-18 11:46:58 +01:00

Added subscriber: @enilnacs

Sergey Sharybin was assigned by Brecht Van Lommel

2013-12-18 12:05:18 +01:00

Brecht Van Lommel commented

2013-12-18 12:08:46 +01:00

Added subscriber: @brecht

Brecht Van Lommel commented

2013-12-18 12:08:46 +01:00

I don't know how well this is intended to work, movie files generally do not support scrubbing so they can be problematic for scrubbing. Generally the advice is to use either image files or proxy/timecode I think, but Sergey is the expert so assigning to him.

This may also be a Quicktime problem since you mention mp4 and mov files.

I don't know how well this is intended to work, movie files generally do not support scrubbing so they can be problematic for scrubbing. Generally the advice is to use either image files or proxy/timecode I think, but Sergey is the expert so assigning to him. This may also be a Quicktime problem since you mention mp4 and mov files.

Petrone Flavius commented

2013-12-18 12:22:37 +01:00

Although i understand that movie files should not be scrubbed, this is of course not practical especially for tracking. The main problem being that for each track a sequence file conversion is needed (bigger memory, lower speed, more work and depending on codec also quality degradation).

Quicktime should generally deliver frame accurate even in LongGOP codecs... but is Blender official using QT or an integrated ffmpeg for mp4/mov ?

Although i understand that movie files should not be scrubbed, this is of course not practical especially for tracking. The main problem being that for each track a sequence file conversion is needed (bigger memory, lower speed, more work and depending on codec also quality degradation). Quicktime should generally deliver frame accurate even in LongGOP codecs... but is Blender official using QT or an integrated ffmpeg for mp4/mov ?

Sergey Sharybin commented

2013-12-18 12:26:58 +01:00

As @brecht mentioned, we can not guarantee accuracy of seek in video files unless you're using timecode. Please generate it from the proxy/timecode panel before tracking. Use either Record Run or Free Run No Gaps timecodes and see whether it helps.

Not sure whetherwe're still using QT or we've switched to FFmpeg on OSX, but we don't have timecodes implemented to QT AFAIR. You might also try re-exporting the video in an external application making sure indices and so are correct.

As @brecht mentioned, we can not guarantee accuracy of seek in video files unless you're using timecode. Please generate it from the proxy/timecode panel before tracking. Use either Record Run or Free Run No Gaps timecodes and see whether it helps. Not sure whetherwe're still using QT or we've switched to FFmpeg on OSX, but we don't have timecodes implemented to QT AFAIR. You might also try re-exporting the video in an external application making sure indices and so are correct.

Petrone Flavius commented

2013-12-18 12:47:49 +01:00

OK, Record Run WORKS by pressing generate proxy, even without generating the proxy JPGs !
Somehow could this be generated by default when you import movie files ? Would be great. Cause you still need to activate TC and set it.
May thanks for the solution.

OK, Record Run WORKS by pressing generate proxy, even without generating the proxy JPGs ! Somehow could this be generated by default when you import movie files ? Would be great. Cause you still need to activate TC and set it. May thanks for the solution.

Sergey Sharybin commented

2013-12-18 13:05:54 +01:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2013-12-18 13:05:54 +01:00

Sergey Sharybin commented

2013-12-18 13:05:54 +01:00

This is actually in my personal TODO. It's just not so much clear which exact TC to use by default. In different cases you might want different ones. Need some much further investigation..

Archiving the report since it's known limitation of video files without timecode. Thanks for it anyway!

This is actually in my personal TODO. It's just not so much clear which exact TC to use by default. In different cases you might want different ones. Need some much further investigation.. Archiving the report since it's known limitation of video files without timecode. Thanks for it anyway!

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Bug with tracking on movie files #37853