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How to rip a Webm from a video and encode in the best possible quality.

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To rip a good quality Webm from a movie, this one-liner will work, this will encode with sound and very high-quality video in small file size.

ffmpeg -i Matrix.mkv -c:v libvpx -b:v 2700k -ss 00:02:30 -t 15 -c:a libvorbis -b:a 384k -sn -copyts -threads 4 swat3.webm

Very nice for sharing a video clip easily. The clip below shows the quality this will give you.

To set a title metadata tag, do it like this.

ffmpeg -i Matrix.mkv -metadata title="Matrix 4" -metadata year="2021" -c:v libvpx -b:v 2700k -ss 00:03:15 -t 15 -c:a libvorbis -b:a 384k -sn -copyts -threads 4 swat5.webm

This is easy to do. Good quality FFmpeg encodes and also a metadata tag in the file. Very useful when uploading a Webm file.

This is the ffprobe information for the encoded Webm file. This shows that it has Dolby 5.1 sound in it and still keeps a good file size.

$ ffprobe -hide_banner swat5.webm
 
Input #0, matroska,webm, from 'swat5.webm':
  Metadata:
    title           : Matrix 4
    YEAR            : 2021
    ENCODER         : Lavf58.45.100
  Duration: 00:00:15.02, start: 0.000000, bitrate: 3071 kb/s
    Stream #0:0: Video: vp8, yuv420p(progressive), 1920x816, SAR 1:1 DAR 40:17, 23.98 fps, 23.98 tbr, 1k tbn, 1k tbc (default)
    Metadata:
      BPS-eng         : 8209176
      DURATION-eng    : 02:27:54.866000000
      NUMBER_OF_FRAMES-eng: 212784
      NUMBER_OF_BYTES-eng: 9106917505
      _STATISTICS_WRITING_APP-eng: mkvmerge v45.0.0 ('Heaven in Pennies') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2021-12-22 08:02:30
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      ENCODER         : Lavc58.91.100 libvpx
      DURATION        : 00:00:15.018000000
    Stream #0:1(eng): Audio: vorbis, 48000 Hz, 5.1, fltp (default)
    Metadata:
      title           : English
      BPS-eng         : 768000
      DURATION-eng    : 02:27:54.880000000
      NUMBER_OF_FRAMES-eng: 277340
      NUMBER_OF_BYTES-eng: 851988480
      _STATISTICS_WRITING_APP-eng: mkvmerge v45.0.0 ('Heaven in Pennies') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2021-12-22 08:02:30
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      ENCODER         : Lavc58.91.100 libvorbis
      DURATION        : 00:00:15.003000000

So this is a very good encoding solution, this gives the best results for a small size. It is only 5.5 megabytes and still contains a 1080p video file and the aforementioned Dolby 5.1 audio.


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