从ffmpeg -i获取视频维度

时间:2011-09-09 13:12:08

标签: python video ffmpeg ffprobe

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。

8 个答案:

答案 0 :(得分:36)

使用ffprobe

示例1:使用键/变量名称

ffprobe -v error -show_entries stream=width,height -of default=noprint_wrappers=1 input.mp4
width=1280
height=720

示例2:正好宽x高

ffprobe -v error -show_entries stream=width,height -of csv=p=0:s=x input.m4v
1280x720

示例3:JSON

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widthheight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widthheight输出。

  • 有关详细信息,请参阅FFprobe DocumentationFFmpeg 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)

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:(