Added auto conversion option for gif to mp4,webm

* webm conversion is slow, but better quality than mp4 conversion and with a typically smaller filesize

config.yaml.dist

@@ -27,6 +27,12 @@ thumbnails:
     post_height: 300
 
 
+convert:
+   gif:
+     generate_webm: false
+     generate_mp4: false
+
+
 # used to send password reset e-mails
 smtp:
     host: # example: localhost

server/szurubooru/api/post_api.py

@@ -69,6 +69,7 @@ def create_post(
         posts.update_post_thumbnail(post, ctx.get_file('thumbnail'))
     ctx.session.add(post)
     ctx.session.flush()
+    posts.generate_alternate_formats(post, content)
     snapshots.create(post, None if anonymous else ctx.user)
     for tag in new_tags:
         snapshots.create(tag, None if anonymous else ctx.user)

server/szurubooru/func/images.py

@@ -79,6 +79,72 @@ class Image:
             '-',
         ])
 
+    def to_webm(self) -> bytes:
+        with util.create_temp_file_path(suffix='.log') as phase_log_path:
+            # Pass 1
+            self._execute([
+                '-i', '{path}',
+                '-pass', '1',
+                '-passlogfile', phase_log_path,
+                '-vcodec', 'libvpx-vp9',
+                '-crf', '4',
+                '-b:v', '2500K',
+                '-acodec', 'libvorbis',
+                '-f', 'webm',
+                '-y', '/dev/null'
+            ])
+
+            # Pass 2
+            return self._execute([
+                '-i', '{path}',
+                '-pass', '2',
+                '-passlogfile', phase_log_path,
+                '-vcodec', 'libvpx-vp9',
+                '-crf', '4',
+                '-b:v', '2500K',
+                '-acodec', 'libvorbis',
+                '-f', 'webm',
+                '-'
+            ])
+
+    def to_mp4(self) -> bytes:
+
+        with util.create_temp_file_path(suffix='.dat') as mp4_temp_path:
+
+            width = self.width
+            height = self.height
+            altered_dimensions = False
+
+            if self.width % 2 != 0:
+                width = self.width - 1
+                altered_dimensions = True
+
+            if self.height % 2 != 0:
+                height = self.height - 1
+                altered_dimensions = True
+
+            args = [
+                '-i', '{path}',
+                '-vcodec', 'libx264',
+                '-preset', 'slow',
+                '-crf', '22',
+                '-b:v', '200K',
+                '-profile:v', 'main',
+                '-pix_fmt', 'yuv420p',
+                '-acodec', 'aac',
+                '-f', 'mp4'
+            ]
+
+            if altered_dimensions:
+                args = args + [
+                    '-filter:v', 'scale=\'%d:%d\'' % (width, height)
+                ]
+
+            self._execute(args + ['-y', mp4_temp_path])
+
+            with open(mp4_temp_path, 'rb') as mp4_temp:
+                return mp4_temp.read()
+
     def _execute(self, cli: List[str], program: str = 'ffmpeg') -> bytes:
         extension = mime.get_extension(mime.get_mime_type(self.content))
         assert extension

server/szurubooru/func/mime.py

@@ -1,58 +1,66 @@
 import re
 from typing import Optional
 
+APPLICATION_SWF = 'application/x-shockwave-flash'
+IMAGE_JPEG = 'image/jpeg'
+IMAGE_PNG = 'image/png'
+IMAGE_GIF = 'image/gif'
+VIDEO_WEBM = 'video/webm'
+VIDEO_MP4 = 'video/mp4'
+APPLICATION_OCTET_STREAM = 'application/octet-stream'
+
 
 def get_mime_type(content: bytes) -> str:
     if not content:
-        return 'application/octet-stream'
+        return APPLICATION_OCTET_STREAM
 
     if content[0:3] in (b'CWS', b'FWS', b'ZWS'):
-        return 'application/x-shockwave-flash'
+        return APPLICATION_SWF
 
     if content[0:3] == b'\xFF\xD8\xFF':
-        return 'image/jpeg'
+        return IMAGE_JPEG
 
     if content[0:6] == b'\x89PNG\x0D\x0A':
-        return 'image/png'
+        return IMAGE_PNG
 
     if content[0:6] in (b'GIF87a', b'GIF89a'):
-        return 'image/gif'
+        return IMAGE_GIF
 
     if content[0:4] == b'\x1A\x45\xDF\xA3':
-        return 'video/webm'
+        return VIDEO_WEBM
 
     if content[4:12] in (b'ftypisom', b'ftypmp42'):
-        return 'video/mp4'
+        return VIDEO_MP4
 
-    return 'application/octet-stream'
+    return APPLICATION_OCTET_STREAM
 
 
 def get_extension(mime_type: str) -> Optional[str]:
     extension_map = {
-        'application/x-shockwave-flash': 'swf',
+        APPLICATION_SWF: 'swf',
-        'image/gif': 'gif',
+        IMAGE_GIF: 'gif',
-        'image/jpeg': 'jpg',
+        IMAGE_JPEG: 'jpg',
-        'image/png': 'png',
+        IMAGE_PNG: 'png',
-        'video/mp4': 'mp4',
+        VIDEO_MP4: 'mp4',
-        'video/webm': 'webm',
+        VIDEO_WEBM: 'webm',
-        'application/octet-stream': 'dat',
+        APPLICATION_OCTET_STREAM: 'dat',
     }
     return extension_map.get((mime_type or '').strip().lower(), None)
 
 
 def is_flash(mime_type: str) -> bool:
-    return mime_type.lower() == 'application/x-shockwave-flash'
+    return mime_type.lower() == APPLICATION_SWF
 
 
 def is_video(mime_type: str) -> bool:
-    return mime_type.lower() in ('application/ogg', 'video/mp4', 'video/webm')
+    return mime_type.lower() in ('application/ogg', VIDEO_MP4, VIDEO_WEBM)
 
 
 def is_image(mime_type: str) -> bool:
-    return mime_type.lower() in ('image/jpeg', 'image/png', 'image/gif')
+    return mime_type.lower() in (IMAGE_JPEG, IMAGE_PNG, IMAGE_GIF)
 
 
 def is_animated_gif(content: bytes) -> bool:
     pattern = b'\x21\xF9\x04[\x00-\xFF]{4}\x00[\x2C\x21]'
-    return get_mime_type(content) == 'image/gif' \
+    return get_mime_type(content) == IMAGE_GIF \
         and len(re.findall(pattern, content)) > 1

server/szurubooru/func/posts.py

@@ -5,7 +5,7 @@ import sqlalchemy as sa
 from szurubooru import config, db, model, errors, rest
 from szurubooru.func import (
     users, scores, comments, tags, util,
-    mime, images, files, image_hash, serialization)
+    mime, images, files, image_hash, serialization, snapshots)
 
 
 EMPTY_PIXEL = (
@@ -429,6 +429,40 @@ def _sync_post_content(post: model.Post) -> None:
         generate_post_thumbnail(post)
 
 
+def generate_alternate_formats(post: model.Post, content: bytes) -> None:
+    assert post
+    assert content
+    if mime.is_animated_gif(content):
+        tag_names = [tag_name.name for tag_name in [tag.names for tag in post.tags]]
+        new_posts = []
+
+        if config.config['convert']['gif']['generate_mp4']:
+            mp4_post, new_tags = create_post(images.Image(content).to_mp4(), tag_names, post.user)
+            update_post_flags(mp4_post, ['loop'])
+            update_post_safety(mp4_post, post.safety)
+            update_post_source(mp4_post, post.source)
+            new_posts += [(mp4_post, new_tags)]
+
+        if config.config['convert']['gif']['generate_webm']:
+            webm_post, new_tags = create_post(images.Image(content).to_webm(), tag_names, post.user)
+            update_post_flags(webm_post, ['loop'])
+            update_post_safety(webm_post, post.safety)
+            update_post_source(webm_post, post.source)
+            new_posts += [(webm_post, new_tags)]
+
+        db.session.flush()
+
+        new_posts = list(filter(lambda i: i[0] is not None, new_posts))
+
+        for new_post, new_tags in new_posts:
+            snapshots.create(new_post, post.user)
+            for tag in new_tags:
+                snapshots.create(tag, post.user)
+
+        new_relations = [p[0].post_id for p in new_posts]
+        update_post_relations(post, new_relations) if len(new_relations) > 0 else None
+
+
 def update_post_content(post: model.Post, content: Optional[bytes]) -> None:
     assert post
     if not content:

server/szurubooru/func/util.py

@@ -41,6 +41,16 @@ def create_temp_file(**kwargs: Any) -> Generator:
         os.remove(path)
 
 
+@contextmanager
+def create_temp_file_path(**kwargs: Any) -> Generator:
+    (descriptor, path) = tempfile.mkstemp(**kwargs)
+    os.close(descriptor)
+    try:
+        yield path
+    finally:
+        os.remove(path)
+
+
 def unalias_dict(source: List[Tuple[List[str], T]]) -> Dict[str, T]:
     output_dict = {}  # type: Dict[str, T]
     for aliases, value in source: