![After successfully converting a 4k MP4 file to WebM, Windows explorer progress bar constantly loads, thumbnail refuses to generate, when libvpx-vp9 is used instead of libvpx (i.e. vp8). : r/ffmpeg After successfully converting a 4k MP4 file to WebM, Windows explorer progress bar constantly loads, thumbnail refuses to generate, when libvpx-vp9 is used instead of libvpx (i.e. vp8). : r/ffmpeg](https://external-preview.redd.it/VYtdYsvlG7CcpjWxpPMxWyS6gK02XKo5BOmB0TG5g_Y.png?width=640&crop=smart&auto=webp&s=db3bd42038d9a5c9caa1d06c50a7ce0d5913d1fa)
After successfully converting a 4k MP4 file to WebM, Windows explorer progress bar constantly loads, thumbnail refuses to generate, when libvpx-vp9 is used instead of libvpx (i.e. vp8). : r/ffmpeg
![Python FFMPEG 2020 convert webm to mp4 using ffmpeg python | How to use FFMPEG Python usng subproces - YouTube Python FFMPEG 2020 convert webm to mp4 using ffmpeg python | How to use FFMPEG Python usng subproces - YouTube](https://i.ytimg.com/vi/W7SIRsIAYao/maxresdefault.jpg)
Python FFMPEG 2020 convert webm to mp4 using ffmpeg python | How to use FFMPEG Python usng subproces - YouTube
![use Ffmpeg.js convert .webm to .mp4, add audio has problem · Issue #403 · muaz-khan/RecordRTC · GitHub use Ffmpeg.js convert .webm to .mp4, add audio has problem · Issue #403 · muaz-khan/RecordRTC · GitHub](https://user-images.githubusercontent.com/24617758/39295744-c69bb70a-4971-11e8-9f05-91166f75f632.png)