Fix performance of GIF re-encoding (#12057)

* Change animated GIF detection to not shell out to ImageMagick

Signed-off-by: Eugen Rochko <eugen@zeonfederated.com>

* Change video encoding parameters to limit to 10800 video frames

Signed-off-by: Eugen Rochko <eugen@zeonfederated.com>

* Limit GIF image size further

Signed-off-by: Eugen Rochko <eugen@zeonfederated.com>

* Always strip metadata from video files

* Fix code style issues

2 files changed, 27 insertions, 10 deletions

diff --git a/app/models/concerns/attachmentable.rb b/app/models/concerns/attachmentable.rb
index 246c2c27c..3bbc6453c 100644
--- a/app/models/concerns/attachmentable.rb
+++ b/app/models/concerns/attachmentable.rb
@@ -6,6 +6,7 @@ module Attachmentable
   extend ActiveSupport::Concern
 
   MAX_MATRIX_LIMIT = 16_777_216 # 4096x4096px or approx. 16MB
+  GIF_MATRIX_LIMIT = 921_600    # 1280x720px
 
   included do
     before_post_process :set_file_extensions
@@ -42,8 +43,9 @@ module Attachmentable
       next if attachment.blank? || !/image.*/.match?(attachment.content_type) || attachment.queued_for_write[:original].blank?
 
       width, height = FastImage.size(attachment.queued_for_write[:original].path)
+      matrix_limit  = attachment.content_type == 'image/gif' ? GIF_MATRIX_LIMIT : MAX_MATRIX_LIMIT
 
-      raise Mastodon::DimensionsValidationError, "#{width}x#{height} images are not supported, must be below #{MAX_MATRIX_LIMIT} sqpx" if width.present? && height.present? && (width * height >= MAX_MATRIX_LIMIT)
+      raise Mastodon::DimensionsValidationError, "#{width}x#{height} images are not supported" if width.present? && height.present? && (width * height > matrix_limit)
     end
   end
 
diff --git a/app/models/media_attachment.rb b/app/models/media_attachment.rb
index c4932f2ef..630dab55a 100644
--- a/app/models/media_attachment.rb
+++ b/app/models/media_attachment.rb
@@ -65,6 +65,17 @@ class MediaAttachment < ApplicationRecord
       file_geometry_parser: FastGeometryParser,
       blurhash: BLURHASH_OPTIONS,
     },
+
+    original: {
+      keep_same_format: true,
+      convert_options: {
+        output: {
+          'map_metadata' => '-1',
+          'c:v' => 'copy',
+          'c:a' => 'copy',
+        },
+      },
+    },
   }.freeze
 
   AUDIO_STYLES = {
@@ -86,14 +97,15 @@ class MediaAttachment < ApplicationRecord
       output: {
         'loglevel' => 'fatal',
         'movflags' => 'faststart',
-        'pix_fmt'  => 'yuv420p',
-        'vf'       => 'scale=\'trunc(iw/2)*2:trunc(ih/2)*2\'',
-        'vsync'    => 'cfr',
-        'c:v'      => 'h264',
-        'b:v'      => '500K',
-        'maxrate'  => '1300K',
-        'bufsize'  => '1300K',
-        'crf'      => 18,
+        'pix_fmt' => 'yuv420p',
+        'vf' => 'scale=\'trunc(iw/2)*2:trunc(ih/2)*2\'',
+        'vsync' => 'cfr',
+        'c:v' => 'h264',
+        'maxrate' => '1300K',
+        'bufsize' => '1300K',
+        'frames:v' => 60 * 60 * 3,
+        'crf' => 18,
+        'map_metadata' => '-1',
       },
     },
   }.freeze
@@ -103,7 +115,7 @@ class MediaAttachment < ApplicationRecord
     original: VIDEO_FORMAT,
   }.freeze
 
-  IMAGE_LIMIT = 8.megabytes
+  IMAGE_LIMIT = 10.megabytes
   VIDEO_LIMIT = 40.megabytes
 
   belongs_to :account,          inverse_of: :media_attachments, optional: true
@@ -244,7 +256,9 @@ class MediaAttachment < ApplicationRecord
 
   def set_meta
     meta = populate_meta
+
     return if meta == {}
+
     file.instance_write :meta, meta
   end
 
@@ -287,6 +301,7 @@ class MediaAttachment < ApplicationRecord
 
   def reset_parent_cache
     return if status_id.nil?
+
     Rails.cache.delete("statuses/#{status_id}")
   end
 end