98 lines
4.5 KiB
Python
98 lines
4.5 KiB
Python
# video_compression_model.py
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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
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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 data_generator(videos, batch_size):
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# Infinite loop to keep generating batches
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while True:
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# Iterate over each video
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for video_details in videos:
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# Get the paths for compressed and original (uncompressed) video files
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video_path = os.path.join(os.path.dirname("test_data/validation/validation.json"), video_details["compressed_video_file"])
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uncompressed_video_path = os.path.join(os.path.dirname("test_data/validation/validation.json"), video_details["original_video_file"])
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CRF = video_details["crf"] / 51
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SPEED = PRESET_SPEED_CATEGORIES.index(video_details["preset_speed"])
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# Open the video files
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cap_compressed = cv2.VideoCapture(video_path)
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cap_uncompressed = cv2.VideoCapture(uncompressed_video_path)
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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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# Read and process frames from both videos
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while cap_compressed.isOpened() and cap_uncompressed.isOpened():
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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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break
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# Preprocess the compressed frame (target)
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compressed_frame = preprocess_frame(compressed_frame, CRF, SPEED)
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# Preprocess the uncompressed frame (input)
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uncompressed_frame = preprocess_frame(uncompressed_frame, 0, PRESET_SPEED_CATEGORIES.index("veryslow")) # Modify if different preprocessing is needed for target frames
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# Append processed frames to batches
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compressed_frame_batch.append(compressed_frame)
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uncompressed_frame_batch.append(uncompressed_frame)
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# If batch is complete, yield it
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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)) # Yielding Training and Target data
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compressed_frame_batch = []
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uncompressed_frame_batch = []
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# Release video files
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cap_compressed.release()
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cap_uncompressed.release()
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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 edges and histogram)
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input_shape_with_histogram = (HEIGHT, WIDTH, 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(1, (3, 3), activation='sigmoid', padding='same')
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])
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def call(self, inputs):
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# Encode the input
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encoded = self.encoder(inputs)
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# Decode the encoded representation
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decoded = self.decoder(encoded)
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return decoded
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