Encode facebook VP9 videos to H264 (not played in Telegram on iOS)

New environment variable in envs/.env_worker: FACEBOOK_ENCODE_TO_H264=True

app_worker/worker/core/config.py

@@ -8,6 +8,7 @@ class WorkerSettings(Settings):
     STORAGE_PATH: DirectoryPath
     THUMBNAIL_FRAME_SECOND: float
     INSTAGRAM_ENCODE_TO_H264: bool
+    FACEBOOK_ENCODE_TO_H264: bool
 
 
 settings = WorkerSettings()

app_worker/ytdl_opts/per_host/__init__.py

@@ -2,10 +2,12 @@ from ytdl_opts.per_host._default import DefaultHost
 from ytdl_opts.per_host.instagram import InstagramHost
 from ytdl_opts.per_host.tiktok import TikTokHost
 from ytdl_opts.per_host.twitter import TwitterHost
+from ytdl_opts.per_host.facebook import FacebookHost
 
 __all__ = [
     'DefaultHost',
     'InstagramHost',
     'TikTokHost',
     'TwitterHost',
+    'FacebookHost',
 ]

app_worker/ytdl_opts/per_host/facebook.py

@@ -0,0 +1,39 @@
+from pathlib import Path
+
+from yt_shared.constants import FACEBOOK_HOSTS
+from yt_shared.enums import DownMediaType
+
+from worker.core.config import settings
+from ytdl_opts.per_host._base import AbstractHostConfig, BaseHostConfModel
+from ytdl_opts.per_host._registry import HostConfRegistry
+
+
+class FacebookHostModel(BaseHostConfModel):
+    pass
+
+
+class FacebookHost(AbstractHostConfig, metaclass=HostConfRegistry):
+    ALLOW_NULL_HOSTNAMES = False
+    HOSTNAMES = FACEBOOK_HOSTS
+    ENCODE_AUDIO = False
+    ENCODE_VIDEO = settings.FACEBOOK_ENCODE_TO_H264
+
+    FFMPEG_AUDIO_OPTS = None
+    # Facebook returns VP9+AAC in MP4 container for logged users and needs to be
+    # encoded to H264 since Telegram doesn't play VP9 on iOS.
+    FFMPEG_VIDEO_OPTS = 'ffmpeg -y -loglevel error -i "{filepath}" -c:v libx264 -pix_fmt yuv420p -preset veryfast -crf 22 -movflags +faststart -c:a copy "{output}"'
+
+    def build_config(
+        self, media_type: DownMediaType, curr_tmp_dir: Path
+    ) -> FacebookHostModel:
+        return FacebookHostModel(
+            hostnames=self.HOSTNAMES,
+            encode_audio=self.ENCODE_AUDIO,
+            encode_video=self.ENCODE_VIDEO,
+            ffmpeg_audio_opts=self.FFMPEG_AUDIO_OPTS,
+            ffmpeg_video_opts=self.FFMPEG_VIDEO_OPTS,
+            ytdl_opts=self._build_ytdl_opts(media_type, curr_tmp_dir),
+        )
+
+    def _build_custom_ytdl_video_opts(self) -> list[str]:
+        return self.DEFAULT_VIDEO_FORMAT_SORT_OPT

envs/.env_worker

@@ -5,3 +5,4 @@ STORAGE_PATH=/filestorage
 
 THUMBNAIL_FRAME_SECOND=10.0
 INSTAGRAM_ENCODE_TO_H264=True
+FACEBOOK_ENCODE_TO_H264=True

yt_shared/yt_shared/constants.py

@@ -21,5 +21,10 @@ TWITTER_HOSTS = (
     't.co',
     'www.t.co',
 )
+FACEBOOK_HOSTS = (
+    'facebook.com',
+    'www.facebook.com',
+)
+
 
 REMOVE_QUERY_PARAMS_HOSTS = TWITTER_HOSTS + INSTAGRAM_HOSTS