107 lines
4.5 KiB
Python
107 lines
4.5 KiB
Python
# video_compression_model.py
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import gc
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import os
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import cv2
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import numpy as np
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import tensorflow as tf
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from featureExtraction import preprocess_frame, scale_crf, scale_speed_preset
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from globalVars import HEIGHT, LOGGER, NUM_COLOUR_CHANNELS, NUM_PRESET_SPEEDS, PRESET_SPEED_CATEGORIES, WIDTH
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#from tensorflow.keras.mixed_precision import Policy
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#policy = Policy('mixed_float16')
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#tf.keras.mixed_precision.set_global_policy(policy)
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def combine_batch(frame, crf, speed, include_controls=True, resize=True):
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processed_frame = preprocess_frame(frame, resize)
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height, width, _ = processed_frame.shape
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combined = [processed_frame]
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if include_controls:
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crf_array = np.full((height, width, 1), crf)
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speed_array = np.full((height, width, 1), speed)
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combined.extend([crf_array, speed_array])
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return np.concatenate(combined, axis=-1)
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def data_generator(videos, batch_size):
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base_dir = os.path.dirname("test_data/validation/validation.json")
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while True:
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# Lists to store the processed frames
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compressed_frame_batch = [] # Input data (Target)
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uncompressed_frame_batch = [] # Target data (Training)
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# Get a list of video capture objects for all videos
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caps_compressed = [cv2.VideoCapture(os.path.join(base_dir, video["compressed_video_file"])) for video in videos]
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caps_uncompressed = [cv2.VideoCapture(os.path.join(base_dir, video["original_video_file"])) for video in videos]
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# As long as any video can provide frames, keep running
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while any(cap.isOpened() for cap in caps_compressed):
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for idx, (cap_compressed, cap_uncompressed) in enumerate(zip(caps_compressed, caps_uncompressed)):
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#print(f"(Video Change) Processing video {idx}") # Print statement to indicate video change
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ret_compressed, compressed_frame = cap_compressed.read()
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ret_uncompressed, uncompressed_frame = cap_uncompressed.read()
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if not ret_compressed or not ret_uncompressed:
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continue
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CRF = scale_crf(videos[idx]["crf"])
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SPEED = scale_speed_preset(PRESET_SPEED_CATEGORIES.index(videos[idx]["preset_speed"]))
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compressed_combined = combine_batch(compressed_frame, CRF, SPEED, include_controls=False)
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uncompressed_combined = combine_batch(uncompressed_frame, 0, scale_speed_preset(PRESET_SPEED_CATEGORIES.index("veryslow")))
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compressed_frame_batch.append(compressed_combined)
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uncompressed_frame_batch.append(uncompressed_combined)
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if len(compressed_frame_batch) == batch_size:
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yield (np.array(uncompressed_frame_batch), np.array(compressed_frame_batch))
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compressed_frame_batch.clear()
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uncompressed_frame_batch.clear()
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# Close all video captures at the end
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for cap in caps_compressed + caps_uncompressed:
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cap.release()
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cv2.destroyAllWindows()
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# If there are frames left that don't fill a whole batch, send them anyway
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if len(compressed_frame_batch) > 0:
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yield (np.array(uncompressed_frame_batch), np.array(compressed_frame_batch))
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class VideoCompressionModel(tf.keras.Model):
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def __init__(self):
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super(VideoCompressionModel, self).__init__()
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LOGGER.debug("Initializing VideoCompressionModel.")
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# Input shape (includes channels for CRF and SPEED_PRESET)
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input_shape_with_histogram = (None, None, NUM_COLOUR_CHANNELS + 2)
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# Encoder part of the model
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self.encoder = tf.keras.Sequential([
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tf.keras.layers.InputLayer(input_shape=input_shape_with_histogram),
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tf.keras.layers.Conv2D(64, (3, 3), activation='relu', padding='same'),
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tf.keras.layers.MaxPooling2D((2, 2), padding='same'),
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tf.keras.layers.Conv2D(32, (3, 3), activation='relu', padding='same'),
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tf.keras.layers.MaxPooling2D((2, 2), padding='same')
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])
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# Decoder part of the model
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self.decoder = tf.keras.Sequential([
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tf.keras.layers.Conv2DTranspose(32, (3, 3), activation='relu', padding='same'),
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tf.keras.layers.UpSampling2D((2, 2)),
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tf.keras.layers.Conv2DTranspose(64, (3, 3), activation='relu', padding='same'),
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tf.keras.layers.UpSampling2D((2, 2)),
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tf.keras.layers.Conv2DTranspose(NUM_COLOUR_CHANNELS, (3, 3), activation='sigmoid', padding='same')
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])
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def call(self, inputs):
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return self.decoder(self.encoder(inputs))
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