如何从ffmpeg
的信息输出中获取视频的高度和宽度。例如,使用以下输出 -
$ ffmpeg -i 1video.mp4
...
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/david/Desktop/1video.mp4':
Metadata:
major_brand : isom
minor_version : 1
compatible_brands: isomavc1
creation_time : 2010-01-24 00:55:16
Duration: 00:00:35.08, start: 0.000000, bitrate: 354 kb/s
Stream #0.0(und): Video: h264 (High), yuv420p, 640x360 [PAR 1:1 DAR 16:9], 597 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc
Metadata:
creation_time : 2010-01-24 00:55:16
Stream #0.1(und): Audio: aac, 44100 Hz, stereo, s16, 109 kb/s
Metadata:
creation_time : 2010-01-24 00:55:17
At least one output file must be specified
我如何获得height = 640, width= 360
?谢谢。
答案 0 :(得分:36)
ffprobe
ffprobe -v error -show_entries stream=width,height -of default=noprint_wrappers=1 input.mp4
width=1280
height=720
ffprobe -v error -show_entries stream=width,height -of csv=p=0:s=x input.m4v
1280x720
ffprobe -v error -show_entries stream=width,height -of json input.mkv
{
"programs": [
],
"streams": [
{
"width": 1280,
"height": 720
},
{
}
]
}
选项的作用:
-v error
进行安静输出,但允许显示错误。排除通常的通用FFmpeg输出信息,包括版本,配置和输入详细信息。
-show_entries stream=width,height
只需显示width
和height
信息流信息。
-of
选项选择输出格式(默认,紧凑,csv,flat,ini,json,xml)。有关每种格式的说明,请参阅FFprobe Documentation: Writers并查看其他格式选项。
-select_streams v:0
如果您的输入包含多个视频流,则可以添加此项。 v:0
将仅选择第一个视频流。否则,您将获得与视频流一样多的width
和height
输出。
有关详细信息,请参阅FFprobe Documentation和FFmpeg Wiki: FFprobe Tips。
答案 1 :(得分:10)
查看mediainfo处理大部分格式。
如果您正在寻找解析ffmpeg输出的方法,请使用正则表达式\d+x\d+
使用perl的示例:
$ ./ffmpeg -i test020.3gp 2>&1 | perl -lane 'print $1 if /(\d+x\d+)/'
176x120
使用python的例子(不完美):
$ ./ffmpeg -i /nfshome/enilfre/pub/test020.3gp 2>&1 | python -c "import sys,re;[sys.stdout.write(str(re.findall(r'(\d+x\d+)', line))) for line in sys.stdin]"
[] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [ '176x120'] [] [] []
Python one-liners并不像perl那样引人注目: - )
答案 2 :(得分:3)
从上面的Fredrik的提示中,我是如何使用MediaInfo(http://mediainfo.sourceforge.net/en)完成的:
>>> p1 = subprocess.Popen(['mediainfo', '--Inform=Video;%Width%x%Height%',
'/Users/david/Desktop/10stest720p.mov'],stdout=PIPE)
>>> dimensions=p1.communicate()[0].strip('\n')
>>> dimensions
'1280x688'
答案 3 :(得分:3)
在this blog post中,在python中有一个粗略的解决方案:
import subprocess, re
pattern = re.compile(r'Stream.*Video.*([0-9]{3,})x([0-9]{3,})')
def get_size(pathtovideo):
p = subprocess.Popen(['ffmpeg', '-i', pathtovideo],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
stdout, stderr = p.communicate()
match = pattern.search(stderr)
if match:
x, y = map(int, match.groups()[0:2])
else:
x = y = 0
return x, y
然而,假设它是3位x 3位数(即854x480),您需要循环遍历可能的尺寸长度,例如(1280x720):
possible_patterns = [re.compile(r'Stream.*Video.*([0-9]{4,})x([0-9]{4,})'), \
re.compile(r'Stream.*Video.*([0-9]{4,})x([0-9]{3,})'), \
re.compile(r'Stream.*Video.*([0-9]{3,})x([0-9]{3,})')]
并检查匹配是否在每一步返回None:
for pattern in possible_patterns:
match = pattern.search(stderr)
if match!=None:
x, y = map(int, match.groups()[0:2])
break
if match == None:
print "COULD NOT GET VIDEO DIMENSIONS"
x = y = 0
return '%sx%s' % (x, y)
可能更漂亮,但有效。
答案 4 :(得分:2)
如此处所述,ffprobe
提供了一种检索视频文件数据的方法。我发现以下命令对ffprobe -v quiet -print_format json -show_streams input-video.xxx
有用,可以查看您可以查看的数据类型。
然后我编写了一个运行上述命令的函数,并返回视频文件的高度和宽度:
import subprocess
import shlex
import json
# function to find the resolution of the input video file
def findVideoResolution(pathToInputVideo):
cmd = "ffprobe -v quiet -print_format json -show_streams"
args = shlex.split(cmd)
args.append(pathToInputVideo)
# run the ffprobe process, decode stdout into utf-8 & convert to JSON
ffprobeOutput = subprocess.check_output(args).decode('utf-8')
ffprobeOutput = json.loads(ffprobeOutput)
# find height and width
height = ffprobeOutput['streams'][0]['height']
width = ffprobeOutput['streams'][0]['width']
return height, width
答案 5 :(得分:1)
坏(\ d + x \ d +)
$ echo 'Stream #0:0(eng): Video: mjpeg (jpeg / 0x6765706A), yuvj420p, 1280x720, 19939 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc' | perl -lane 'print $1 if /(\d+x\d+)/'
> 0x6765706
好([0-9] {2,} x [0-9] +)
$ echo 'Stream #0:0(eng): Video: mjpeg (jpeg / 0x6765706A), yuvj420p, 1280x720, 19939 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc' | perl -lane 'print $1 if /([0-9]{2,}x[0-9]+)/'
> 1280x720
答案 6 :(得分:1)
回答这个问题的最好方法是让ffmpeg开发人员准确解释ffmpeg输出的格式是什么,以及我们是否可以始终如一地假设大小位于其中的指定上下文中。在此之前,我们只能从示例中猜出格式通常是什么。
这是我的尝试。与这些“单行”相比,它是冗长的,但那是因为我想知道它最终失败的原因。
import subprocess
def get_video_size(video_filename):
"""Returns width, height of video using ffprobe"""
# Video duration and hence start time
proc = subprocess.Popen(['ffprobe', video_filename],
stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
res = proc.communicate()[0]
# Check if ffprobe failed, probably on a bad file
if 'Invalid data found when processing input' in res:
raise ValueError("Invalid data found by ffprobe in %s" % video_filename)
# Find the video stream
width_height_l = []
for line in res.split("\n"):
# Skip lines that aren't stream info
if not line.strip().startswith("Stream #"):
continue
# Check that this is a video stream
comma_split = line.split(',')
if " Video: " not in comma_split[0]:
continue
# The third group should contain the size and aspect ratio
if len(comma_split) < 3:
raise ValueError("malform video stream string:", line)
# The third group should contain the size and aspect, separated
# by spaces
size_and_aspect = comma_split[2].split()
if len(size_and_aspect) == 0:
raise ValueError("malformed size/aspect:", comma_split[2])
size_string = size_and_aspect[0]
# The size should be two numbers separated by x
width_height = size_string.split('x')
if len(width_height) != 2:
raise ValueError("malformed size string:", size_string)
# Cast to int
width_height_l.append(map(int, width_height))
if len(width_height_l) > 1:
print "warning: multiple video streams found, returning first"
return width_height_l[0]
答案 7 :(得分:0)
没有重新模块
out = error_message.split() # make a list from resulting error string
out.reverse()
for index, item in enumerate(out): # extract the item before item= "[PAR"
if item == "[PAR": #
dimension_string = out[i+1] #
video_width, video_height = dimension_string.split("x")
编辑:不是一个好的答案,因为并非所有视频都有“PAR”信息:(