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Change video compression parameters (#26631)
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@ -44,6 +44,7 @@ class MediaAttachment < ApplicationRecord
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MAX_VIDEO_MATRIX_LIMIT = 8_294_400 # 3840x2160px
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MAX_VIDEO_FRAME_RATE = 120
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MAX_VIDEO_FRAMES = 36_000 # Approx. 5 minutes at 120 fps
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IMAGE_FILE_EXTENSIONS = %w(.jpg .jpeg .png .gif .webp .heic .heif .avif).freeze
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VIDEO_FILE_EXTENSIONS = %w(.webm .mp4 .m4v .mov).freeze
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@ -98,17 +99,12 @@ class MediaAttachment < ApplicationRecord
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convert_options: {
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output: {
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'loglevel' => 'fatal',
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'movflags' => 'faststart',
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'pix_fmt' => 'yuv420p',
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'vf' => 'scale=\'trunc(iw/2)*2:trunc(ih/2)*2\'',
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'vsync' => 'cfr',
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'preset' => 'veryfast',
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'c:v' => 'h264',
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'maxrate' => '1300K',
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'bufsize' => '1300K',
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'b:v' => '1300K',
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'frames:v' => 60 * 60 * 3,
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'crf' => 18,
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'c:a' => 'aac',
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'b:a' => '192k',
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'map_metadata' => '-1',
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'frames:v' => MAX_VIDEO_FRAMES,
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}.freeze,
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}.freeze,
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}.freeze
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@ -135,7 +131,7 @@ class MediaAttachment < ApplicationRecord
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convert_options: {
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output: {
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'loglevel' => 'fatal',
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:vf => 'scale=\'min(400\, iw):min(400\, ih)\':force_original_aspect_ratio=decrease',
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:vf => 'scale=\'min(640\, iw):min(640\, ih)\':force_original_aspect_ratio=decrease',
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}.freeze,
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}.freeze,
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format: 'png',
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@ -4,6 +4,9 @@ module Paperclip
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# This transcoder is only to be used for the MediaAttachment model
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# to check when uploaded videos are actually gifv's
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class Transcoder < Paperclip::Processor
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# This is the H.264 "High" value taken from https://www.dr-lex.be/info-stuff/videocalc.html
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BITS_PER_PIXEL = 0.11
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def initialize(file, options = {}, attachment = nil)
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super
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@ -38,8 +41,11 @@ module Paperclip
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@output_options['vframes'] = 1
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when 'mp4'
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unless eligible_to_passthrough?(metadata)
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@output_options['acodec'] = 'aac'
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@output_options['strict'] = 'experimental'
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bitrate = (metadata.width * metadata.height * 30 * BITS_PER_PIXEL) / 1_000
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@output_options['b:v'] = "#{bitrate}k"
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@output_options['maxrate'] = "#{bitrate + 192}k"
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@output_options['bufsize'] = "#{bitrate * 5}k"
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if high_vfr?(metadata)
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@output_options['vsync'] = 'vfr'
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