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# Copyright (c) OpenMMLab. All rights reserved.
import os
import os.path as osp
import subprocess
import tempfile
from annotator.uniformer.mmcv.utils import requires_executable
@requires_executable('ffmpeg')
def convert_video(in_file,
out_file,
print_cmd=False,
pre_options='',
**kwargs):
"""Convert a video with ffmpeg.
This provides a general api to ffmpeg, the executed command is::
`ffmpeg -y <pre_options> -i <in_file> <options> <out_file>`
Options(kwargs) are mapped to ffmpeg commands with the following rules:
- key=val: "-key val"
- key=True: "-key"
- key=False: ""
Args:
in_file (str): Input video filename.
out_file (str): Output video filename.
pre_options (str): Options appears before "-i <in_file>".
print_cmd (bool): Whether to print the final ffmpeg command.
"""
options = []
for k, v in kwargs.items():
if isinstance(v, bool):
if v:
options.append(f'-{k}')
elif k == 'log_level':
assert v in [
'quiet', 'panic', 'fatal', 'error', 'warning', 'info',
'verbose', 'debug', 'trace'
]
options.append(f'-loglevel {v}')
else:
options.append(f'-{k} {v}')
cmd = f'ffmpeg -y {pre_options} -i {in_file} {" ".join(options)} ' \
f'{out_file}'
if print_cmd:
print(cmd)
subprocess.call(cmd, shell=True)
@requires_executable('ffmpeg')
def resize_video(in_file,
out_file,
size=None,
ratio=None,
keep_ar=False,
log_level='info',
print_cmd=False):
"""Resize a video.
Args:
in_file (str): Input video filename.
out_file (str): Output video filename.
size (tuple): Expected size (w, h), eg, (320, 240) or (320, -1).
ratio (tuple or float): Expected resize ratio, (2, 0.5) means
(w*2, h*0.5).
keep_ar (bool): Whether to keep original aspect ratio.
log_level (str): Logging level of ffmpeg.
print_cmd (bool): Whether to print the final ffmpeg command.
"""
if size is None and ratio is None:
raise ValueError('expected size or ratio must be specified')
if size is not None and ratio is not None:
raise ValueError('size and ratio cannot be specified at the same time')
options = {'log_level': log_level}
if size:
if not keep_ar:
options['vf'] = f'scale={size[0]}:{size[1]}'
else:
options['vf'] = f'scale=w={size[0]}:h={size[1]}:' \
'force_original_aspect_ratio=decrease'
else:
if not isinstance(ratio, tuple):
ratio = (ratio, ratio)
options['vf'] = f'scale="trunc(iw*{ratio[0]}):trunc(ih*{ratio[1]})"'
convert_video(in_file, out_file, print_cmd, **options)
@requires_executable('ffmpeg')
def cut_video(in_file,
out_file,
start=None,
end=None,
vcodec=None,
acodec=None,
log_level='info',
print_cmd=False):
"""Cut a clip from a video.
Args:
in_file (str): Input video filename.
out_file (str): Output video filename.
start (None or float): Start time (in seconds).
end (None or float): End time (in seconds).
vcodec (None or str): Output video codec, None for unchanged.
acodec (None or str): Output audio codec, None for unchanged.
log_level (str): Logging level of ffmpeg.
print_cmd (bool): Whether to print the final ffmpeg command.
"""
options = {'log_level': log_level}
if vcodec is None:
options['vcodec'] = 'copy'
if acodec is None:
options['acodec'] = 'copy'
if start:
options['ss'] = start
else:
start = 0
if end:
options['t'] = end - start
convert_video(in_file, out_file, print_cmd, **options)
@requires_executable('ffmpeg')
def concat_video(video_list,
out_file,
vcodec=None,
acodec=None,
log_level='info',
print_cmd=False):
"""Concatenate multiple videos into a single one.
Args:
video_list (list): A list of video filenames
out_file (str): Output video filename
vcodec (None or str): Output video codec, None for unchanged
acodec (None or str): Output audio codec, None for unchanged
log_level (str): Logging level of ffmpeg.
print_cmd (bool): Whether to print the final ffmpeg command.
"""
tmp_filehandler, tmp_filename = tempfile.mkstemp(suffix='.txt', text=True)
with open(tmp_filename, 'w') as f:
for filename in video_list:
f.write(f'file {osp.abspath(filename)}\n')
options = {'log_level': log_level}
if vcodec is None:
options['vcodec'] = 'copy'
if acodec is None:
options['acodec'] = 'copy'
convert_video(
tmp_filename,
out_file,
print_cmd,
pre_options='-f concat -safe 0',
**options)
os.close(tmp_filehandler)
os.remove(tmp_filename)
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