Warning about MKV files!

Dan203

Senior Developer
Staff member
We just discovered an issue with our MKV reader which could introduce sync issues with MKV input files. This only effects v5, not v4. Please be aware that any files you create in v5 that started from an MKV source file could be effected. Some may not have any issue, but others could be off by a couple hundred ms. So if you've output any files in v5 that started with an MKV source I highly recommend you check them and ensure they are in sync before discarding the source file.

This bug will be fixed in the next release.
 
Last edited:

Danr

Administrator
Staff member
ensure they are in sync before discarding the source file
If you have discarded the source you can correct the sync in the edited file using the audio adjustment. However, if the output edited file is also MKV, please wait until the next beta build before you correct.
 

Dan203

Senior Developer
Staff member
Yeah sorry, my bad. There was a calculation error in the MKV reader that was doubling the initial offset of just the video stream. So there would be an A/V shift equal to whatever the offset of the first video frame was. If it was zero then your file would be fine. But in most cases there is some sort of offset so it likely effected most files.
 

MrVideo

Active member
Not a problem. At least we know about it so that we can fix any affected files before we forget about it.
 

TimA-C

Member
Just to clarify, if my source is a .ts H264 file and I output as a .MKV H264 file, do I need to worry? Or is just purely incoming .mkv files where the problem can occur?
 

ArtS

New member
My input files are in most cases H.264 TS, output are H.264 MKV. But several are MPEG2 files. When I opened output files in VRD5 I have seen approximately 150-200 ms sound offset. I was afraid about output files. But, when I opened the same files in VRD4, there was not offset anymore. :) So I can agree with Dan. Output files are good.

ArtS
 

Dan203

Senior Developer
Staff member
Yeah this only effected MKV source files. It would have no effect on MKV output if the source was any format other then MKV.
 
Top Bottom