VP9 - Opus, Windows 10 64-bit, Avidemux 2.7.0_r170514 - x64

[Jan Gruuthuse]

Anyone else having troubles with downloaded,IDM ,  YouTube videos: vp9 with opus audio in .mkv container
where you get:

Attempt to open ........... failed!

or edited video looks like this:

I can't recreate these issues (I'm not on windows), these videos behave normally on Ubuntu 16.04.2 Qt5.
This issue is been reported in Avidemux-Spanish Ã,» Problema con videos bajados de Youtube

I have no clue on what is going on.
the 1st video MKV-480p is 1 GB

[minegroasprilla]

People, test these videos with Internet Download Manager (mkv-480p):
- https://www.youtube.com/watch?v=pI03QOFXKpM
- https://www.youtube.com/watch?v=ve_ZpZUM6WI

[eumagga0x2a]

People, test these videos with Internet Download Manager (mkv-480p)

What is the point? youtube-dl exists and works.

[eumagga0x2a]

I see, builds for Windows don't include libvpx, required to decode VP9.

[eumagga0x2a]

I can confirm that the vp9+opus MKV gets loaded and played fine in my private win64 Avidemux build with the libvpx plugin included. The official cross-build environment has to be updated to produce nightly and release builds which are capable of decoding vp9.

[minegroasprilla]

So, is the problem fixed?.

[Jan Gruuthuse]

Probably when next nightly build appears on line?

[eumagga0x2a]

So, is the problem fixed?

Let's say so: the nature of the problem is identified. Once the official build environment gets updated to include libvpx, the following nightly builds will be able to decode VP9. No idea when this will happen though.

[mean]

The thing is, libavcodec should be able to decode these
mplayer or mpv can, and they use libavcodec

using libvpx is a workaround

[eumagga0x2a]

Sure, this is a stop-gap measure. It would be great if you could identify the cause why the bundled ffmpeg fails to decode VP9 properly, but if this takes time from the work on DXVA2 issues with ffmpeg 3.3, I'm not confident that this is worth it ATM...

[eumagga0x2a]

libvpx has been added to the build environment, VP9 decoding should work now.

@minegroasprilla, please test the latest win64 nightly from

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http://avidemux.org/nightly/win64/avidemux_r170517_win64Qt5_417.zip

[minegroasprilla]

libvpx has been added to the build environment, VP9 decoding should work now.

@minegroasprilla, please test the latest win64 nightly from

Code Select Expand

http://avidemux.org/nightly/win64/avidemux_r170517_win64Qt5_417.zip

I tested the last version but the problems continue.
MKV (vp9) don't open, and WEBM (vp9) open but when I edit it, the resulting video is bad.

[eumagga0x2a]

I tested the last version but the problems continue.
MKV (vp9) don't open,

This works for me with MKV (vp9 + opus) generated by ffmpeg in copy mode from original streams. Please provide a sample video (as short as possible).

and WEBM (vp9) open but when I edit it, the resulting video is bad.

Actually, I can't save the MKV (vp9 + opus) in copy mode at all, no matter whether the target container is MKV or webm. The error is

Code Select Expand

[adm_lavLogCallback] 18:52:15-981 [lavc] Unknown bitstream filter 'vp9_superframe'
[FF]Error writing video packet

[minegroasprilla]

I need to edit those videos to MP4.
Here a sample video in MKV-vp9: http://www.mediafire.com/file/408a3gahelne0zf/Sample-mkv.mkv

[eumagga0x2a]

I need to edit those videos to MP4.

If you need MP4, why don't you download the h264/m4a version in a MP4 container in the first place? youtube-dl allows you to query available versions of a video and specify one that suits your needs best (you do need the most recent version of youtube-dl). VP9 and opus can't be saved as MP4 without reencoding.

Here a sample video in MKV-vp9: http://www.mediafire.com/file/408a3gahelne0zf/Sample-mkv.mkv

Avidemux indeed doesn't like the file:

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[MKV] *** Header dump ***
EBML_VERSION:1
EBML_COMPAT:1
EBML_MAXIDLEN:4
EBML_MAXSIZELEN:8
EBML_DOCTYPE:<matroska>
EBML_DOCTYPE_VERSION:4
EBML_DOCTYPE_COMPAT:2
[MKV] *** End of Header dump ***
MKV_TIMECODE_SCALE:1000000
MKV_MUXING_APP skipped
MKV_WRITING_APP skipped
MKV_SEGMENT_UID skipped
MKV_DURATION skipped
[open]  TimeBase found : 1000000 ns
[open]  [MKV] found Segment at 0x3b
[readSeekHead] Parsing SeekHead
[MKV/SeekHead] Tag 0x53ab not found (len 4)
[goBeforeAtomAtPosition] No offset available for MKV_TRACKS
[analyzeTracks] Cannot go to the TRACKS atom
[MKV] incorrect tracks
[MKV] Tracks analyzed
[MKV] No video


ffmpeg is more tolerant here. Remuxing the video with ffmpeg allows Avidemux to load the video successfully:

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ffmpeg -i Sample-mkv.mkv -c copy Sample-mkv-remuxed-with-ffmpeg.mkv