#mkv — Public Fediverse posts

PixelSmash, czyli podatność, która może zaatakować zewsząd

Jeśli mamy potencjalnie ciekawą medialnie i rozległą w swoim zasięgu podatność, nie może zabraknąć efektownej nazwy, która na długo zapisze się w słowniku wszystkich zainteresowanych cyberbezpieczeństwem. W przeszłości były to ShellShock, Heartbleed, Spectre, Meltdown, Log4Shell, Dirty COW i wiele innych. Hasło na dziś to PixelSmash. Nie mam pewności, czy PixelSmash...

#WBiegu #Avi #DoS #Ffmpeg #Mkv #Mov #Pixelsmach #Rce

https://sekurak.pl/pixelsmash-czyli-podatnosc-ktora-moze-zaatakowac-zewszad/

Edit: Actually, it's done.

I wonder what CPU 663.8% means here and if it's something to worry about.
```
[ble: elapsed 2h8m14s (CPU 663.8%)] for f in *.webm; do ffmpeg -i "$f" "${f%}.mkv"; done
```
---
People with knowledge about video file formats, or especially about ffmpeg.

Should it take a super long time for .webm files to convert to .mkv?

I'm using ffmpeg right now to convert a folder of about 30 .webm files to .mkv and it's been running a few hours and my laptop is getting really hot.

Genuinely not sure if I should let it finish or pull the plug.

#tech #techsupport #videofileformats #webm #mkv #ffmpeg

(tags here so people can mute them if they are interested in seeing these kinds of posts)

My subtitle editor is now on PyPI.

https://pypi.org/project/subtle-gui/

It is very much in an alpha state, but I've used it quite a bit to convert Bluray subtitles to SRT (text) files for use with Plex. It requires MKVToolNix for reading media files, and Tesseract OCR for OCR scanning. These applications need to be callable from the command line. I plan to make this configurable later.

#VideoTools #Media #MKV #Subtitles #Bluray #OpenSource #Python #Qt6

I've just released Mp3tag for Mac v1.13 ☀️

• Download via https://mp3tag.app/get
• Release Notes at https://community.mp3tag.de/t/mp3tag-for-mac-v1-13-released/71465?u=florian

Mp3tag is a powerful and easy-to-use tool to edit metadata of audio files. Musicians, DJs, podcasters, and audio-enthusiasts use it for many different aspects of handling audio files.

Enjoy and take care 🧡

#audio #music #macos #mp3 #mp4 #mkv #flac #matroska

Недостающее звено при обработке медиа на Go

Большинство медиа-библиотек для Go рано или поздно упираются в одну и ту же проблему. У них нет собственного декодера. Вместо этого они полагаются на установленный в системе пакет FFmpeg, shared библиотеки, платформозависимые DLL или внешние исполняемые файлы, которые должны присутствовать на целевой системе. На этапе разработки всё работает. Затем начинается развертывание. И внезапно вы отлаживаете отсутствующие DLL в Windows, несовместимые версии FFmpeg в Linux, различия версий из Homebrew на macOS, образы контейнеров без нужных библиотек или продуктовые серверы, где рядовое обновление пакета неожиданно ломает обработку медиа.

https://habr.com/ru/articles/1042916/

#go #ffmpeg #cgo #decoder #video #audio #media #mp4 #webm #mkv

Converting .mkv to .mp4 with #Handbrake successful, plays locally. But when uploading to #InternetArchive , error:

There is a network problem
400 Bad Data
BadContent
Uploaded content is unacceptable.
Resource>video file has improper extension, try one of these: .mpv .mkv

But the whole reason for converting is that Archive won't stream mkv, only its own mp4 conversion of far lower quality :(

#Video #MP4 #MKV

archivos mkv

Para trabajar con archivos de video mkv existe un programa muy específico llamado MKVToolNix GUI

con el podremos entre otras muchas cosas quitar los subtítulos y/o las pistas de audio de los idiomas que no nos interesen .

Lo instalamos desde synaptic o con la terminal:

 sudo apt install ffmpeg mkvtoolnix mkvtool-gui    

Otro caso de uso sería para extraer un archivo de subtítulos de un video que venga en formato mkv, con el fin de traducirlo luego al idioma que queramos y tomando como base lo citado en
https://hijosdeinit.gitlab.io/howto_mkvextract_extraccion_subtitulos_video_matroska/

 ffmpeg -i video.mkv 

 mkvextract tracks  video.mkv 4:video.srt   

Para traducir encontré por ahora esta web
https://editsub.com/es/translate

Existe la posibilidad de utilizar al editor de video kdenlive para ese fin, como lo menciono en
https://josegon.wordpress.com/2026/02/09/kdenlive-25-12-2/

Need to convert a local mkv to mp4. Got (thru AM #AppImage package manager) #Gharmonize & tried it

1. "Upload": to where?? I want local
2. Choices required in dropdown menus... where nothing drops down
3. "Help"... doesn't even say what version it is, let alone help
4. "Settings"... does nothing at all

Bonus: UI a non-native mishmash, like Electron & Gnome had a monstrous lovechild you'd lock away in the attic

Fastest uninstall ever!

#Video #FFMPEG #VideoFormats #Linux #MKV #MP4

(Linux news in previous posts)

FOSS NEWS

PeerTube 8.2 adds channel ownership transfer, live-stream pausing & video segment removal:
https://alternativeto.net/news/2026/5/peertube-8-2-adds-channel-ownership-transfer-live-stream-pausing-and-video-segment-removal/

Proton is making it easier than ever to switch from Gmail to Proton Mail:
https://betanews.com/article/proton-is-making-it-easier-than-ever-to-switch-from-gmail-to-proton-mail/

Mozilla Firefox 151.0.2 Is Out Now to Improve Split View, Disk Caching, and More:
https://9to5linux.com/mozilla-firefox-151-0-2-is-out-now-to-improve-split-view-disk-caching-and-more

Zen Browser launches a Boosts feature to customize colors, fonts and styles on any website:
https://alternativeto.net/news/2026/5/zen-browser-launches-a-boosts-feature-to-customize-colors-fonts-and-styles-on-any-website/

New Web and Mobile Strategy for LibreOffice:
https://blog.documentfoundation.org/blog/2026/05/27/new-web-and-mobile-strategy-for-libreoffice/

Krita 5.3.2 released with Text tool and font dropdown improvements:
https://www.linuxcompatible.org/story/krita-532-released/

MKVToolNix 99.0 MKV Manipulation Tool Improves the MKVToolNix GUI, mkvmerge:
https://9to5linux.com/mkvtoolnix-99-0-mkv-manipulation-tool-improves-the-mkvtoolnix-gui-mkvmerge

Calibre 9.9 E-Book Manager Updates and Improves the WolneLektury Store:
https://9to5linux.com/calibre-9-9-e-book-manager-updates-and-improves-the-wolnelektury-store

Marknote 1.6 WYSIWYG Note-Taking App Adds Initial Support for Sub-Folders:
https://9to5linux.com/marknote-1-6-wysiwyg-note-taking-app-adds-initial-support-for-sub-folders

Flowblade 2.24.2 Fixes a Crash and Keeps Linux Video Editing Alive:
https://www.linuxcompatible.org/story/flowblade-2242-released/

Canonical to shut Ubuntu Pastebin after 18 years of service:
https://www.omgubuntu.co.uk/2026/05/canonical-ubuntu-pastebin-shutdown
(Yet another Canonical service/product shut down. Although tbh, I didn't even know about this service until know (not that I would use anything Canonical lol))

(Last) Major FosseryWeb update - Java cheatsheets, RSS feed for articles, and more:
https://odysee.com/@fossery-tech:4/fosseryweb-java-cheatsheets-rss-feed:d

(more FOSS news in comments)

#WeeklyNews #OpenSource #FOSSNews #FOSS #OpenSourceNews #News #PeerTube #Fediverse #Fedi #ProtonMail #Email #Firefox #MozillaFirefox #ZenBrowser #LibreOffice #Krita #MKVToolNix #MKV #Calibre #Marknote #Flowblade #UbuntuPastebin #FosseryWeb #FosseryWebMin #WebBrowser #EmailProvider #Degoogle #ContentCreation #Notetaking #FosseryTech

https://www.youtube.com/watch?v=ACk-8DmvYJU

Gilada nos habla en este vídeo sobre la historia del fantástico contenedor multimedia MKV, muy útil a nivel profesional y con potencial para todo tipo de uso personal.

I've just released Mp3tag for Mac v1.12 🌱

• Download via https://mp3tag.app/get
• Release Notes at https://community.mp3tag.de/t/mp3tag-for-mac-v1-12-released/70982?u=florian

Mp3tag is a powerful and easy-to-use tool to edit metadata of audio files. Musicians, DJs, podcasters, and audio-enthusiasts use it for many different aspects of handling audio files.

Enjoy and take care 🧡

#audio #music #macos #mp3 #mp4 #mkv #flac #matroska

What's a good #format to serialize simple structured #data in an efficient way?

I'm thinking about some binary #XML encoding. Also, #ASN.1 because it natively uses integers, not just strings. Is the packed representation (PER) widely supported?

The data will be a bunch of interleaved time series streams, so variable field lengths could be a big win.

Is there a format for stuff like that?

#Matroska's EBML? Only I'd have to hack the schema in.

#mkv #serialization #formats

I've just released Mp3tag for Mac v1.10 💫

• Download via https://mp3tag.app/get
• Release Notes at https://community.mp3tag.de/t/mp3tag-for-mac-1-10-released/70391?u=florian

Mp3tag is a powerful and easy-to-use tool to edit metadata of audio files. Musicians, DJs, podcasters, and audio-enthusiasts use it for many different aspects of handling audio files.

Merry Christmas! Enjoy and take care 🎄

#audio #music #macos #mp3 #mp4 #mkv #flac #matroska

Free Software that I rely on. One per day.

Day 18:

MKVToolNix

This is a tool kit of utilities, including a GUI front end, for manipulating Matroska streaming multimedia files (usually "MKV" or "MKA" files).

The Matroska container format allows for multiple audio, video, and text streams, which means you can encode a video with multiple options for audio and subtitles (as well as alternate video tracks).

It also supports setting up "Chapter" marks.

A must-have for authoring and checking complex videos for streaming and download use.

https://mkvtoolnix.download/

#FreeSoftwareAdvent #MKVToolNix #MKV #Multimedia #Matroska

When's #Mastodon gonna roll out support for #WebP animations? It should also start handling video formats like #WebM or #MKV, a social for nerds and geeks oughta be one of the first to jump on that, especially since they're open formats with no royalties. #opensource #socialmedia

Bu .mkv kayıt olayını da şimdiye kadar hiç araştırmadım.

OBS Studio ve Simple Screen Recorder de kayıtları mkv olarak yapıyorlar.

Varsayılan olarak kayıt bitince yada istenirse de kayıt anında mp4'e "çeviriyorlar"

Fakat kayıtları neden mkv olarak yaptıklarını hiç bilmiyorum.

Bir ara okuyup öğrenmek gerek.

#mkv

https://www.free-videoconverter.net/tr/tips/mkv-file/

Firefox tukee nyt Matroska-videoformaattia

Pyyntö Matroskan (eli MKV:n) tuen lisäämiseksi Firefoxiin tehtiin jo 8 vuotta sitten, mutta nyt se - vihdoin - on saatu mukaan Firefoxiin.

https://dawn.fi/uutiset/2025/09/11/firefox-matroska-tuki

#matroska #mkv #firefox #selain #selaimet #uutiset #teknologia #tekniikka

💡 Mozilla Firefox finalmente può eseguire i video Matroska

https://gomoot.com/mozilla-firefox-finalmente-puo-eseguire-i-video-matroska

#blog #firefox #matroska #mkv #mozilla #news #picks #rust #tech #tecnologia @mozilla @firefox @ItaLinuxSociety

Firefox va lire les fichiers MKV, contrairement aux systèmes d'Apple http://dlvr.it/TN1W3V #Firefox #MKV

TIL: #Firefox kann kein #mkv
bugzilla.mozilla.org/show_bug.…

Das Ticket is 8(!!!) Jahre alt! Und mkv war schon vor 8 Jahren durchaus verbreitet. Offensichtlich funktioniert es nicht so einfach: "Ist doch OSS, kannste forken und mkv einbauen! Oder einen Patch einreichen."

Well, I did it. I deleted my #Loops account, I am off that #Fediverse platform. There is no #WebBroswer option to use it. Uploading #Webm and #MKV videos is a no-go, and it failed to optimize the #mp4 from my phone.

I just made a #WebM video for #loops it is 1.8mb down from the 8.6 mb when it was a #MKV. It has been several minutes at 0% of optimizing the video. Hahaha what!? Wait... It was taking to long so I tried the mkv file and that is stuck. Does loops only do #Mp4 files? That is too bad and kinda dumb. Looks like I will be dropping loops from my #fediverse profile :angery: