The release page should have a build of the most recent version.
You're going to need ffmpeg
You also need .NET Framework 4.0
Place WebM Converter.exe and the fonts folder in the same directory as ffmpeg.exe
Video
Path of the input file.
C:\Users\Name\Videos\chinese cartoon.mkv
Subtitles
Path of the subtitle file. Currently only supports .ass. Leave blank if you don't want subtitles. Press the button to switch between external and internal subtitles. Using internal subs will only work with containers that support subtitles and files with only one subtitle track.
C:\Users\Name\Videos\chinese cartoon.ass
Output
Where you want to put the output file and what you want it to be named.
C:\Users\Name\Videos\chinese cartoon.webm
MetaData
As of now only supports the title tag.
Saiki Kusuo
Start Time
Enter the start time in seconds or hh:mm:ss.
0
44
00:43:54.901341
Stop Time
Enter the stop time in hh:mm:ss.
00:30:1471.163
01:34:12.123
Size Limit/Bitrate
The maximum size in megabytes or the bitrate in kb/s of the output. Press the button to switch between size limit and bitrate.
1
2.5
3.12341
Audio/Video or Audio Only
Enter the bitrate for audio in kilobits. Use "0" if you don't want sound. Pressing the button will produce a webm with only audio.
32
192
Resolution
The resolution of the output file. The first number is the width, the second is the height. -1 scales the other size to keep the same aspect ratio, leave both as -1 to keep the input resolution.
-1:720
-1:1080
1280:-1
Crop
This lets you crop a video. The command looks like this, Width:Height:X:Y. Width is the width of the rectangle being cropped, height is the height, x and y are the coordinates of the rectangle being cropped. in_w and in_h grab the videos width and height respectively.
500:500:10:10
Saturation
This lets you remove color from the output file, this is useful if you want to output to greyscale or remove a small amount of color to reduce the filesize. Note that using this to reduce filesize will only work if the file is easily fittable within the size limit. This can be a number from 0 to 1, 0 being greyscale and 1 being full color.
0
0.4324
1
Speed
Adjust the speed with a multiplier. As of now this works by dropping frames.
2
0.4
16
Image Preview
This lets you preview the output video, very useful for checking cropping. Subtitles are not shown. Start seeks to the beginning, Preview refreshes, End seeks to the end.