25

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 video.mp4
...
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.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

我怎么得到height = 640, width= 360

4

8 回答 8

83

利用ffprobe

示例 1:使用键/变量名

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

示例 2:宽度 x 高度

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

示例 3:JSON

ffprobe -v error -select_streams v -show_entries stream=width,height -of json input.mkv 
{
    "programs": [

    ],
    "streams": [
        {
            "width": 1280,
            "height": 720
        }
    ]
}

示例 4:JSON 压缩

ffprobe -v error -select_streams v -show_entries stream=width,height -of json=compact=1 input.mkv 
{
    "programs": [

    ],
    "streams": [
        { "width": 1280, "height": 720 }
    ]
}

示例 5:XML

ffprobe -v error -select_streams v -show_entries stream=width,height -of xml input.mkv 
<?xml version="1.0" encoding="UTF-8"?>
<ffprobe>
    <programs>
    </programs>

    <streams>
        <stream width="1280" height="720"/>
    </streams>
</ffprobe>

选项的作用:

  • -v error进行安静的输出,但允许显示错误。不包括通常的通用 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)。有关每种格式的描述和查看其他格式选项,请参阅FFprobe 文档:编写器。

  • -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width的输出。可用于显示来自所有视频流的信息,并避免JSON 和 XML 输出中的空音频信息。height-select_streams vstream

  • 有关更多信息,请参阅FFprobe 文档FFmpeg Wiki:FFprobe Tips

于 2015-04-12T01:47:19.443 回答
15

看看mediainfo处理大多数格式。

如果您正在寻找一种方法来解析 ffmpeg 的输出,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 的示例(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 不像 perl 那样吸引人:-)

于 2011-09-09T13:22:39.710 回答
4

如此处所述,ffprobe提供了一种检索有关视频文件的数据的方法。我发现以下命令对于ffprobe -v quiet -print_format json -show_streams input-video.xxx查看可以签出的数据类型很有用。

然后我编写了一个函数来运行上述命令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
于 2015-12-18T13:22:32.390 回答
3

这篇博文中,python 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,这假设它是 3 位 x 3 位(即 854x480),您需要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 match 是否在每一步都返回 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。

于 2012-10-17T15:33:17.610 回答
3

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
于 2013-07-12T14:21:35.357 回答
3

根据上面 Fredrik 的提示,这是我使用 MediaInfo ( http://mediainfo.sourceforge.net/en ) 的方法:

>>> p1 = subprocess.Popen(['mediainfo', '--Inform=Video;%Width%x%Height%',         
    '/Users/david/Desktop/10stest720p.mov'],stdout=PIPE)
>>> dimensions=p1.communicate()[0].strip('\n')
>>> dimensions
'1280x688'
于 2011-09-09T21:48:20.187 回答
2

回答这个问题的最佳方法是 ffmpeg 开发人员准确解释 ffmpeg 输出的格式是什么,以及我们是否可以一致地假设大小位于其中的指定上下文中。在那之前,我们只能从示例中猜测通常的格式是什么。

这是我的尝试。与这些“单行”相比,它很冗长,但那是因为我想知道为什么它最终会失败。

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]
于 2015-04-11T23:54:03.817 回答
0

without re module

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")

Edit: not a good answer because not all videos have that "PAR" information :(

于 2014-04-15T10:52:30.107 回答