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Another way to encode a WEBM file in the best possible quality.

by

This is a very good way to encode a top-quality WEBM file, this uses 2-pass encoding, I encoded a 30-second file and it was only 3205kB. Not bad at all. Encoding a 15-second silent WEBM file made a 1.6-megabyte file.

2pass.sh
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#!/bin/bash
 
FILE="$1"
DURATION="$2"
OUTFILE="$3"
 
ffmpeg -hide_banner -y -i $FILE -t $DURATION -pix_fmt yuv420p10le -profile:v 2 -g 9999 -threads 8 \
-row-mt 1 -tile-columns 2 -tile-rows 2 -quality good -speed 2 -auto-alt-ref 1 -lag-in-frames 25 \
-arnr-maxframes 7 -arnr-strength 5 -enable-tpl 1 -c:v libvpx-vp9 -qmin 0 -qmax 63 -minrate 0 \
-b:v 873k -filter_complex "setparams=range=tv:colorspace=bt709:color_primaries=bt709:color_trc=bt709" \
-an -sn -map_metadata -1 -map_chapters -1 -bitexact -pass 1 -an -f webm /dev/null
 
ffmpeg -hide_banner -y -i $FILE -t $DURATION -pix_fmt yuv420p10le -profile:v 2 -g 9999 -threads 8 \
-row-mt 1 -tile-columns 2 -tile-rows 2 -quality good -speed 2 -auto-alt-ref 1 -lag-in-frames 25 \
-arnr-maxframes 7 -arnr-strength 5 -enable-tpl 1 -c:v libvpx-vp9 -qmin 0 -qmax 63 -minrate 0 \
-b:v 873k -filter_complex "setparams=range=tv:colorspace=bt709:color_primaries=bt709:color_trc=bt709" \
-an -sn -map_metadata -1 -map_chapters -1 -bitexact -pass 2 $OUTFILE

Use the script like this. ./2pass.sh 640x360_MP4_382577081780319467.mp4 15 charge.webm. This will work just fine.

2-pass encoding is the only way to get the best quality out of an encode, this works very well. Use the -hide_banner option to hide the version information and other unneeded stuff. The -y parameter allows the script to overwrite a file when it is run again. This script should be very useful to any Linux user who wants to share very useful WebM files online.

Here is a lot of information about this WebM file I made.

(base) ┌─jason-Lenovo-H50-55@jason⬎
└─◉ 5.1-~/Videos-10:00-⚫ ◉--[$]  ☕ ffprobe -hide_banner charge.webm 
Input #0, matroska,webm, from 'charge.webm':
  Metadata:
    encoder         : Lavf
  Duration: 00:00:15.00, start: 0.000000, bitrate: 874 kb/s
  Stream #0:0: Video: vp9 (Profile 2), yuv420p10le(tv, bt709, progressive), 640x360, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 1k tbn, 1k tbc (default)
    Metadata:
      ENCODER         : Lavc libvpx-vp9
      DURATION        : 00:00:15.000000000

This would be quite useful for posting a video clip on 4chan, they allowed 4 Megabyte webm files recently.


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