What codec for webm?

[Starduster]

On a new Server 2019 and trying to use .avs input to ffmpeg and getting similar, but different, errors on DirectShowSource and FFVideoSource.

sld2=DirectShowSource("8_0_0_2.webm", fps=15, convertfps=True)

Gives the error: The format is not supported and

v=FFVideoSource("8_0_0_2.webm")

Gives the error: Video codec not found. If I switch the sequence so I call FFAudioSource first, I get the error: Access Violation.

I have installed the K-Lite Basic codec pack but I thought that's all I had installed previously. The MediaInfo for the file is:

Format : WebM
Format version : Version 4
File size : 3.17 MiB
Duration : 11 s 939 ms
Overall bit rate : 2 230 kb/s
Writing application : Lavf58.33.100
Writing library : Lavf58.33.100

Video
ID : 1
Format : VP9
Codec ID : V_VP9
Duration : 11 s 939 ms
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Language : English
Default : Yes
Forced : No
Color range : Limited
ALPHA_MODE : 1

Audio
ID : 2
Format : Opus
Codec ID : A_OPUS
Duration : 11 s 640 ms
Channel(s) : 1 channel
Channel layout : C
Sampling rate : 48.0 kHz
Bit depth : 32 bits
Compression mode : Lossy
Language : English
Default : Yes
Forced : No


I assume there is a missing codec but this stuff has surprised me before!

[sneaker_ger]

v=FFVideoSource("8_0_0_2.webm")

Gives the error: Video codec not found. If I switch the sequence so I call FFAudioSource first, I get the error: Access Violation.
Can you try the following ffms2 binary?
https://ln2.sync.com/dl/917b6fe60/d9e5tyaq-qwmnwnbq-ks2xwnur-j9bbdfcz

[Starduster]

Excellent!! That worked. I had a fffms2.dll in the plugins directory but it was from 2013. Thanks for the great help!