### Author Topic: opening MKV (VP9+OPUS) failed  (Read 304 times)

#### xtremepowersRO

• Newbie
• Posts: 2
##### opening MKV (VP9+OPUS) failed
« on: July 31, 2019, 09:06:45 PM »
I've been using the software for more than 3 years and successfully edited A LOT of MP4s and MKVs
However, I could NEVER make it work a MKV (VP9+OPUS). It always fails to even open it. What is wrong?
Running W7 atm but back when I had W10 it didn't work either.
No matter what version of AVIDemux is, it just won't load.
Tested on two PCs.
Current version installed: 2.7.2
« Last Edit: July 31, 2019, 09:09:44 PM by xtremepowersRO »

#### eumagga0x2a

• Moderator
• Hero Member
• Posts: 3400
##### Re: opening MKV (VP9+OPUS) failed
« Reply #1 on: August 01, 2019, 12:07:04 AM »
Please use the youtube-dl tool to download videos from YouTube, it is known for generating working MKV files, also when selecting vp9+opus. Please also explain which service you were using to obtain broken files and provide one such file as sample via WeTransfer.

To be able to save vp9 video in copy mode in Avidemux, please use a more recent build, preferably the latest 2.7.4 nightly.

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#### xtremepowersRO

• Newbie
• Posts: 2
##### Re: opening MKV (VP9+OPUS) failed
« Reply #2 on: August 03, 2019, 12:36:01 AM »
I can play any file just fine using VLC, KM Player, MPC-HC.

The error comes when the audio is OPUS.
« Last Edit: August 03, 2019, 12:42:21 AM by xtremepowersRO »

#### eumagga0x2a

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• Hero Member
• Posts: 3400
##### Re: opening MKV (VP9+OPUS) failed
« Reply #3 on: August 03, 2019, 02:43:00 AM »
Have you tried with one of the latest nightly builds I pointed to?

If yes, and if the problem persists, please provide a sample MKV file via WeTransfer produced by the applications or services you named so that I can try to examine the file. If the file conforms to the specs, I'll need to look whether it is easily possible to extend the capabilities of the Matroska demuxer in Avidemux to handle it properly. Otherwise there is no need in a quirk on Avidemux part as youtube-dl + ffmpeg produce perfectly working files.

I guess even remuxing the files with ffmpeg would make them compatible with Avidemux:

Code: [Select]
ffmpeg -i "DriveLetter:\Path\to\input.mkv" -c copy "DriveLetter:\Path\to\output.mkv"
In any case it is low priority as a workaround is freely available.

#### lenin38

• Newbie
• Posts: 28
##### Re: opening MKV (VP9+OPUS) failed
« Reply #4 on: August 09, 2019, 02:11:30 PM »