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import os
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import os.path as osp
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import subprocess
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import mmengine
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data_root = '../../../data/gym'
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anno_root = f'{data_root}/annotations'
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event_anno_file = f'{anno_root}/event_annotation.json'
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event_root = f'{data_root}/events'
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subaction_root = f'{data_root}/subactions'
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events = os.listdir(event_root)
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events = set(events)
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annotation = mmengine.load(event_anno_file)
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mmengine.mkdir_or_exist(subaction_root)
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for k, v in annotation.items():
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if k + '.mp4' not in events:
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print(f'video {k[:11]} has not been downloaded '
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f'or the event clip {k} not generated')
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continue
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video_path = osp.join(event_root, k + '.mp4')
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for subaction_id, subaction_anno in v.items():
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timestamps = subaction_anno['timestamps']
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start_time, end_time = timestamps[0][0], timestamps[-1][1]
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subaction_name = k + '_' + subaction_id
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output_filename = subaction_name + '.mp4'
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command = [
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'ffmpeg', '-i',
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'"%s"' % video_path, '-ss',
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str(start_time), '-t',
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str(end_time - start_time), '-c:v', 'libx264', '-c:a', 'copy',
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'-threads', '8', '-loglevel', 'panic',
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'"%s"' % osp.join(subaction_root, output_filename)
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]
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command = ' '.join(command)
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try:
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subprocess.check_output(
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command, shell=True, stderr=subprocess.STDOUT)
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except subprocess.CalledProcessError:
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print(
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f'Trimming of the Subaction {subaction_name} of Event '
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f'{k} Failed',
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flush=True)
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