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A step-by-step guide to creating webms in FFmpeg that both look good and fit 4chan's size constraints. Also how to remove black bars, avoid black thumbnails and hardcode subtitles.
I'm going to share my trade secrets with you and hope you'll post yours below, so we may all improve. I'm not perfect, but I can spare you some frustrating issues. Still, there's no shortcut to practice. I recommend you pick a 15-30s clip and just encode it with a dozen different settings to get a feel for what works.
This shall be a place to discuss how to make great webms.
This is *not* tech support and *not* a comprehensive documentation. You can google for either of those. I did the same.
There will be a brief introduction to the most important tools to get you started, using only free and open software. The guide is geared towards Windows users.
Covered core tools: FFmpeg (encoding), Avidemux (basic editing), MediaInfo (analysis), mkvtoolnix (muxing and stream management)
Recommended tools I use but will not cover: MPC-HC (video playback), Audacity (advanced audio editing), Blender (advanced video editing), GIMP (image editing), Notepad++ (text editor), Aegisub (subtitles)
To demonstrate encoding we will use the free and open movie Big Buck Bunny available for download at peach.blender.org/index.php/download/. All clips of this movie are (c) copyright 2008, Blender Foundation / www.bigbuckbunny.org and are free to use if this attribution is given.