Read the multi-window target frames via ffmpeg/ffprobe instead of cv2

video_manager built its video reader on cv2.VideoCapture, which cannot
decode AV1 with the bundled opencv wheel on Linux, so the multi-window
target pack (read_video_chunk -> select_video_frames) came back empty and
frames passed through unswapped.

Replace the reader with a persistent ffmpeg rawvideo pipe whose instance
lives in the pool store, mirroring the cv2.VideoCapture lifecycle: probe
width/height/fps/frame_total via ffprobe, spawn an ffmpeg pipe seeked to
the chunk start, read frames sequentially, restart on a backward seek.
All ffmpeg/ffprobe command construction goes through the builders; the
single-frame cv2 path is left untouched (scope is the multi-window reader).

ffprobe.py / ffprobe_builder.py follow the v4 template. AV1 now swaps
correctly at ~20 fps (vs the ~11 fps temp-frame variant); H.264 stays
correct at ~18 fps.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

facefusion/ffmpeg_builder.py

@@ -83,6 +83,14 @@ def unsafe_concat() -> List[Command]:
 	return [ '-f', 'concat', '-safe', '0' ]
 
 
+def set_input_seek(seek_time : float) -> List[Command]:
+	return [ '-ss', str(seek_time) ]
+
+
+def set_output_format(output_format : str) -> List[Command]:
+	return [ '-f', output_format ]
+
+
 def enforce_pixel_format(pixel_format : str) -> List[Command]:
 	return [ '-pix_fmt', pixel_format ]
 

facefusion/ffprobe.py

@@ -0,0 +1,79 @@
+import subprocess
+from typing import Dict, List
+
+from facefusion import ffprobe_builder
+from facefusion.types import Buffer, Command, Fps, VideoMetadata
+
+
+def run_ffprobe(commands : List[Command]) -> subprocess.Popen[Buffer]:
+	commands = ffprobe_builder.run(commands)
+	return subprocess.Popen(commands, stderr = subprocess.PIPE, stdout = subprocess.PIPE)
+
+
+def parse_entries(output : Buffer) -> Dict[str, str]:
+	media_entries = {}
+
+	if output:
+		lines = output.decode().strip().splitlines()
+
+		for line in lines:
+			if '=' in line:
+				key, value = line.split('=', 1)
+				media_entries[key] = value
+
+	return media_entries
+
+
+def probe_entries(media_path : str, entries : List[str]) -> Dict[str, str]:
+	commands = ffprobe_builder.chain(
+		ffprobe_builder.show_entries(entries),
+		ffprobe_builder.format_to_key_value(),
+		ffprobe_builder.set_input(media_path)
+	)
+	output, _ = run_ffprobe(commands).communicate()
+
+	return parse_entries(output)
+
+
+def probe_video_entries(video_path : str, entries : List[str]) -> Dict[str, str]:
+	commands = ffprobe_builder.chain(
+		ffprobe_builder.select_video_stream(),
+		ffprobe_builder.show_entries(entries),
+		ffprobe_builder.format_to_key_value(),
+		ffprobe_builder.set_input(video_path)
+	)
+	output, _ = run_ffprobe(commands).communicate()
+
+	return parse_entries(output)
+
+
+def extract_video_metadata(video_path : str) -> VideoMetadata:
+	video_entries = probe_video_entries(video_path, [ 'duration', 'width', 'height', 'r_frame_rate', 'bit_rate' ])
+
+	duration = float(video_entries.get('duration'))
+	fps = extract_video_fps(video_entries.get('r_frame_rate'))
+	frame_total = int(duration * fps)
+	width = int(video_entries.get('width'))
+	height = int(video_entries.get('height'))
+	bit_rate = int(video_entries.get('bit_rate'))
+
+	video_metadata : VideoMetadata =\
+	{
+		'duration' : duration,
+		'frame_total' : frame_total,
+		'fps' : fps,
+		'resolution' : (width, height),
+		'bit_rate' : bit_rate
+	}
+
+	return video_metadata
+
+
+def extract_video_fps(frame_rate : str) -> Fps:
+	if frame_rate and '/' in frame_rate:
+		numerator, denominator = frame_rate.split('/')
+
+		if int(numerator) and int(denominator):
+			return int(numerator) / int(denominator)
+
+	return 0.0

facefusion/ffprobe_builder.py

@@ -0,0 +1,33 @@
+import itertools
+import shutil
+from typing import List
+
+from facefusion.types import Command
+
+
+def run(commands : List[Command]) -> List[Command]:
+	return [ shutil.which('ffprobe'), '-loglevel', 'error' ] + commands
+
+
+def chain(*commands : List[Command]) -> List[Command]:
+	return list(itertools.chain(*commands))
+
+
+def select_video_stream() -> List[Command]:
+	return [ '-select_streams', 'v:0' ]
+
+
+def show_entries(entries : List[str]) -> List[Command]:
+	return [ '-show_entries', 'stream=' + ','.join(entries) ]
+
+
+def format_to_value() -> List[Command]:
+	return [ '-of', 'default=noprint_wrappers=1:nokey=1' ]
+
+
+def format_to_key_value() -> List[Command]:
+	return [ '-of', 'default=noprint_wrappers=1' ]
+
+
+def set_input(input_path : str) -> List[Command]:
+	return [ '-i', input_path ]

facefusion/types.py

@@ -1,3 +1,4 @@
+import subprocess
 from collections import namedtuple
 from threading import Lock
 from typing import Any, Callable, Dict, List, Literal, NotRequired, Optional, Tuple, TypeAlias, TypedDict
@@ -66,11 +67,6 @@ LocalePoolSet : TypeAlias = Dict[str, Locales]
 VideoCaptureSet : TypeAlias = Dict[str, cv2.VideoCapture]
 VideoWriterSet : TypeAlias = Dict[str, cv2.VideoWriter]
 CameraCaptureSet : TypeAlias = Dict[str, cv2.VideoCapture]
-VideoPoolSet = TypedDict('VideoPoolSet',
-{
-	'capture' : VideoCaptureSet,
-	'writer' : VideoWriterSet
-})
 CameraPoolSet = TypedDict('CameraPoolSet',
 {
 	'capture' : CameraCaptureSet
@@ -97,11 +93,39 @@ VoiceChunk : TypeAlias = NDArray[Any]
 
 Fps : TypeAlias = float
 Duration : TypeAlias = float
+
+Buffer : TypeAlias = bytes
+BitRate : TypeAlias = int
+VideoReader = TypedDict('VideoReader',
+{
+	'process' : subprocess.Popen,
+	'video_path' : str,
+	'width' : int,
+	'height' : int,
+	'fps' : Fps,
+	'frame_total' : int,
+	'position' : int
+})
+VideoReaderSet : TypeAlias = Dict[str, VideoReader]
+VideoPoolSet = TypedDict('VideoPoolSet',
+{
+	'capture' : VideoCaptureSet,
+	'writer' : VideoWriterSet,
+	'reader' : VideoReaderSet
+})
 Color : TypeAlias = Tuple[int, int, int, int]
 Padding : TypeAlias = Tuple[int, int, int, int]
 Margin : TypeAlias = Tuple[int, int, int, int]
 Orientation = Literal['landscape', 'portrait']
 Resolution : TypeAlias = Tuple[int, int]
+VideoMetadata = TypedDict('VideoMetadata',
+{
+	'duration' : Duration,
+	'frame_total' : int,
+	'fps' : Fps,
+	'resolution' : Resolution,
+	'bit_rate' : BitRate
+})
 
 ProcessState = Literal['checking', 'processing', 'stopping', 'pending']
 Args : TypeAlias = Dict[str, Any]

facefusion/video_manager.py

@@ -1,11 +1,18 @@
-import cv2
+import subprocess
+from typing import Optional, Tuple
 
-from facefusion.types import VideoPoolSet
+import cv2
+import numpy
+
+from facefusion import ffmpeg_builder
+from facefusion.ffprobe import extract_video_metadata
+from facefusion.types import Fps, VideoPoolSet, VideoReader, VisionFrame
 
 VIDEO_POOL_SET : VideoPoolSet =\
 {
 	'capture': {},
-	'writer': {}
+	'writer': {},
+	'reader': {}
 }
 
 
@@ -25,6 +32,55 @@ def conditional_set_video_frame_position(video_capture : cv2.VideoCapture, frame
 	return True
 
 
+def create_video_reader_process(video_path : str, frame_position : int, video_fps : Fps) -> subprocess.Popen[bytes]:
+	commands = ffmpeg_builder.chain(
+		ffmpeg_builder.set_input_seek(frame_position / video_fps),
+		ffmpeg_builder.set_input(video_path),
+		ffmpeg_builder.prevent_frame_drop(),
+		ffmpeg_builder.enforce_pixel_format('bgr24'),
+		ffmpeg_builder.set_output_format('rawvideo'),
+		ffmpeg_builder.cast_stream()
+	)
+	commands = ffmpeg_builder.run(commands)
+	return subprocess.Popen(commands, stdout = subprocess.PIPE, stderr = subprocess.DEVNULL)
+
+
+def get_video_reader(video_path : str) -> VideoReader:
+	if video_path not in VIDEO_POOL_SET.get('reader'):
+		video_metadata = extract_video_metadata(video_path)
+		width, height = video_metadata.get('resolution')
+
+		VIDEO_POOL_SET['reader'][video_path] =\
+		{
+			'process': create_video_reader_process(video_path, 0, video_metadata.get('fps')),
+			'video_path': video_path,
+			'width': width,
+			'height': height,
+			'fps': video_metadata.get('fps'),
+			'frame_total': video_metadata.get('frame_total'),
+			'position': 0
+		}
+
+	return VIDEO_POOL_SET.get('reader').get(video_path)
+
+
+def conditional_set_video_reader_position(video_reader : VideoReader, frame_position : int) -> None:
+	if not video_reader.get('position') == frame_position:
+		video_reader.get('process').terminate()
+		video_reader['process'] = create_video_reader_process(video_reader.get('video_path'), frame_position, video_reader.get('fps'))
+		video_reader['position'] = frame_position
+
+
+def read_video_reader_frame(video_reader : VideoReader) -> Tuple[bool, Optional[VisionFrame]]:
+	frame_size = video_reader.get('width') * video_reader.get('height') * 3
+	frame_buffer = video_reader.get('process').stdout.read(frame_size)
+
+	if len(frame_buffer) == frame_size:
+		video_reader['position'] = video_reader.get('position') + 1
+		return True, numpy.frombuffer(frame_buffer, numpy.uint8).reshape(video_reader.get('height'), video_reader.get('width'), 3).copy()
+	return False, None
+
+
 def get_video_writer(video_path : str) -> cv2.VideoWriter:
 	if video_path not in VIDEO_POOL_SET.get('writer'):
 		video_writer = cv2.VideoWriter()
@@ -42,5 +98,9 @@ def clear_video_pool() -> None:
 	for video_writer in VIDEO_POOL_SET.get('writer').values():
 		video_writer.release()
 
+	for video_reader in VIDEO_POOL_SET.get('reader').values():
+		video_reader.get('process').terminate()
+
 	VIDEO_POOL_SET['capture'].clear()
 	VIDEO_POOL_SET['writer'].clear()
+	VIDEO_POOL_SET['reader'].clear()

facefusion/vision.py

@@ -10,7 +10,7 @@ from facefusion.common_helper import is_windows
 from facefusion.filesystem import get_file_extension, is_image, is_video
 from facefusion.thread_helper import thread_lock, thread_semaphore
 from facefusion.types import ColorMode, Duration, Fps, Mask, Orientation, Resolution, Scale, VisionFrame
-from facefusion.video_manager import conditional_set_video_frame_position, get_video_capture
+from facefusion.video_manager import conditional_set_video_frame_position, conditional_set_video_reader_position, get_video_capture, get_video_reader, read_video_reader_frame
 
 
 def read_static_images(image_paths : List[str], color_mode : ColorMode = 'rgb') -> List[VisionFrame]:
@@ -102,17 +102,20 @@ def read_video_chunk(video_path : str, chunk_number : int, chunk_size : int) ->
 	video_frame_chunk = {}
 
 	if is_video(video_path) and chunk_number > -1:
-		video_capture = get_video_capture(video_path)
+		video_reader = get_video_reader(video_path)
 
-		if video_capture and video_capture.isOpened():
+		if video_reader:
-			video_frame_total = int(video_capture.get(cv2.CAP_PROP_FRAME_COUNT))
 			video_frame_position = chunk_number * chunk_size
+			video_frame_end = video_frame_position + chunk_size
+
+			if video_reader.get('frame_total') > 0:
+				video_frame_end = min(video_frame_end, video_reader.get('frame_total'))
 
 			with thread_semaphore():
-				conditional_set_video_frame_position(video_capture, video_frame_position)
+				conditional_set_video_reader_position(video_reader, video_frame_position)
 
-				for frame_number in range(video_frame_position, min(video_frame_position + chunk_size, video_frame_total)):
+				for frame_number in range(video_frame_position, video_frame_end):
-					has_vision_frame, vision_frame = video_capture.read()
+					has_vision_frame, vision_frame = read_video_reader_frame(video_reader)
 
 					if has_vision_frame:
 						video_frame_chunk[frame_number] = vision_frame