Python - mencoder不会在不同的文件夹中生成视频。
我正在使用Python调用mencoder来获取一堆图像并将它们转换为视频。我对此做的代码是：
def Video(self,X,Y,location):#generate a video from the images
location=location.replace('\\','/')
name='Slide.avi'
command = ('C:\Downloads\MPlayer-athlon-svn-34401\mencoder.exe',# location of mencoder
'mf://'+location+'/*.png',# location of the images
'-mf',
'type=png:w='+str(X)+':h='+str(Y)+':fps=25',#size of video and fps
'-ovc',
'lavc',
'-lavcopts',
'vcodec=ffv1',
'-oac',
'copy',
'-o',
location+'/'+name)#output
subprocess.check_call(command)
其中location是包含我想要串联成视频的所有图像的文件夹。 现在的问题是，如果我的python脚本位于同时包含图像的文件夹中，这样就可以了，我得到了一个视频。但如果位置不同，mencoder只会给我一个空视频。我不明白为什么会这样。如果我的python脚本在该文件夹中，则代码可以工作，但如果它是不同的文件夹则不行。
我已经为mencoder打开了详细信息，这是我成功时得到的：
MEncoder Sherpya-SVN-r34401-4.6.2 (C) 2000-2011 MPlayer Team
Setting PATH to C:\Downloads\MPlayer-athlon-svn-34401\codecs
get_path('codecs.conf') -> 'C:\Users\Main/mplayer/codecs.conf'
Reading optional codecs config file C:\Users\Main/mplayer/codecs.conf: No such file or directory
Reading optional codecs config file /mingw/etc/mplayer/codecs.conf: No such file or directory
Using built-in default codecs.conf.
init_freetype
Using MMX (with tiny bit MMX2) Optimized OnScreenDisplay
get_path('fonts') -> 'C:\Users\Main/mplayer/fonts'
Configuration: --extra-cflags=-I/c/Work/mplayer/live --extra-ldflags=-lws2_32 --prefix=/mingw --enable-static --enable-md5sum --enable-menu --enable-faac --enable-enca --enable-sdl --enable-caca --enable-gl --enable-freetype --enable-png --enable-mng --enable-jpeg --enable-gif --enable-tga --enable-mad --enable-tv --enable-theora --disable-vidix --disable-faac-lavc --disable-inet6 --flavor=athlon
WINSOCK2 init: 0
STREAM: [mf] mf://C:/Users/Main/Desktop/temp/*.png
STREAM: Description: Multiple files input
STREAM: Author: Benjamin Zores, Albeu
STREAM: Comment:
success: format: 16 data: 0x0 - 0x0
MF file format detected.
[mf] search expr: C:/Users/Main/Desktop/temp/*.png
[mf] number of files: 50 (200)
==> Found video stream: 0
VIDEO: [MPNG] 560x560 24bpp 25.000 fps 0.0 kbps ( 0.0 kbyte/s)
[V] filefmt:16 fourcc:0x474E504D size:560x560 fps:25.000 ftime:=0.0400
WINSOCK2 init: 0
WINSOCK2 init: 0
[file] File size is 0 bytes
STREAM: [file] C:/Users/Main/Desktop/temp/Slide.avi
STREAM: Description: File
STREAM: Author: Albeu
STREAM: Comment: based on the code from ??? (probably Arpi)
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
[png @ 01235100]err{or,}_recognition separate: 2; 1
[png @ 01235100]err{or,}_recognition combined: 2; 196609
INFO: libavcodec init OK!
Selected video codec: [ffpng] vfm: ffmpeg (FFmpeg PNG)
==========================================================================
[ffmpeg] aspect_ratio: 0.000000
VDec: vo config request - 560 x 560 (preferred colorspace: RGB 24-bit)
Trying filter chain: expand lavc
Could not find matching colorspace - retrying with -vf scale...
Opening video filter: [scale]
SwScale params: -1 x -1 (-1=no scaling)
Trying filter chain: scale expand lavc
VDec: using RGB 24-bit as output csp (no 6)
Movie-Aspect is undefined - no prescaling applied.
VO Config (560x560->560x560,flags=0,'MPlayer',0x52474218)
SwScaler: reducing / aligning filtersize 1 -> 4
SwScaler: reducing / aligning filtersize 1 -> 4
SwScaler: reducing / aligning filtersize 1 -> 1
SwScaler: reducing / aligning filtersize 9 -> 8
[swscaler @ 01216d40]BICUBIC scaler, from rgb24 to yuv420p using MMX2
[swscaler @ 01216d40]560x560 -> 560x560
[swscaler @ 01216d40]lum srcW=560 srcH=560 dstW=560 dstH=560 xInc=65536 yInc=65536
[swscaler @ 01216d40]chr srcW=280 srcH=560 dstW=280 dstH=280 xInc=65536 yInc=131072
REQ: flags=0x401 req=0x0
REQ: flags=0x401 req=0x0
videocodec: libavcodec (560x560 fourcc=31564646 [FFV1])
[ffv1 @ 01235100]err{or,}_recognition separate: 1; 1
[ffv1 @ 01235100]err{or,}_recognition combined: 1; 65537
[ffv1 @ 01235100]Unsupported bit depth: 0
*** [scale] Allocating mp_image_t, 560x560x24bpp RGB packed, 940800 bytes
*** [lavc] Allocating mp_image_t, 560x560x12bpp YUV planar, 470400 bytes
*** [expand] Direct Rendering mp_image_t, 560x560x12bpp YUV planar, 470400 bytes
Unicode font: 773 glyphs.
Unicode font: 773 glyphs.
Muxer frame buffer sending 1 frame(s) to the muxer.
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Pos: 0.0s 1f ( 1%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/14 D/B/S 0/0/0
*** [scale] Allocating mp_image_t, 560x560x24bpp RGB packed, 940800 bytes
Pos: 0.1s 2f ( 3%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/12 D/B/S 0/0/0
Pos: 0.1s 3f ( 5%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/11 D/B/S 0/0/0
Pos: 0.2s 4f ( 7%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/11 D/B/S 0/0/0
Pos: 0.2s 5f (10%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/10 D/B/S 0/0/0
Pos: 0.2s 6f (11%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/10 D/B/S 0/0/0
Pos: 0.3s 7f (14%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/10 D/B/S 0/0/0
Pos: 0.3s 8f (15%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/10 D/B/S 0/0/0
Pos: 0.4s 9f (18%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/10 D/B/S 0/0/0
Pos: 0.4s 10f (20%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/10 D/B/S 0/0/0
Pos: 0.4s 11f (21%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/10 D/B/S 0/0/0
Pos: 0.5s 12f (23%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/10 D/B/S 0/0/0
Pos: 0.5s 13f (25%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/10 D/B/S 0/0/0
Pos: 0.6s 14f (28%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/10 D/B/S 0/0/0
Pos: 0.6s 15f (30%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/10 D/B/S 0/0/0
Pos: 0.6s 16f (31%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/10 D/B/S 0/0/0
Pos: 0.7s 17f (34%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 0.7s 18f (36%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 0.8s 19f (37%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 0.8s 20f (40%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 0.8s 21f (41%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 0.9s 22f (43%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 0.9s 23f (46%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.0s 24f (47%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.0s 25f (50%) 0fps Trem: 0min 1mb A-V:0.000 [0:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.0s 26f (52%) 0fps Trem: 0min 1mb A-V:0.000 [5215:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.1s 27f (55%) 0fps Trem: 0min 1mb A-V:0.000 [5176:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.1s 28f (56%) 0fps Trem: 0min 1mb A-V:0.000 [5136:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.2s 29f (58%) 0fps Trem: 0min 1mb A-V:0.000 [5097:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.2s 30f (61%) 0fps Trem: 0min 1mb A-V:0.000 [5059:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.2s 31f (62%) 0fps Trem: 0min 1mb A-V:0.000 [5021:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.3s 32f (64%) 0fps Trem: 0min 1mb A-V:0.000 [4983:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.3s 33f (67%) 0fps Trem: 0min 1mb A-V:0.000 [4946:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.4s 34f (68%) 0fps Trem: 0min 1mb A-V:0.000 [4910:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.4s 35f (70%) 0fps Trem: 0min 1mb A-V:0.000 [4873:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.4s 36f (73%) 0fps Trem: 0min 1mb A-V:0.000 [4838:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.5s 37f (75%) 0fps Trem: 0min 1mb A-V:0.000 [4802:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.5s 38f (76%) 0fps Trem: 0min 1mb A-V:0.000 [4767:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.6s 39f (79%) 0fps Trem: 0min 1mb A-V:0.000 [4732:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.6s 40f (81%) 0fps Trem: 0min 1mb A-V:0.000 [4698:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.6s 41f (82%) 0fps Trem: 0min 1mb A-V:0.000 [4664:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.7s 42f (85%) 0fps Trem: 0min 1mb A-V:0.000 [4631:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.7s 43f (87%) 0fps Trem: 0min 1mb A-V:0.000 [4599:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.8s 44f (88%) 0fps Trem: 0min 1mb A-V:0.000 [4566:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.8s 45f (91%) 0fps Trem: 0min 1mb A-V:0.000 [4534:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.8s 46f (93%) 0fps Trem: 0min 1mb A-V:0.000 [4502:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.9s 47f (94%) 0fps Trem: 0min 1mb A-V:0.000 [4471:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 1.9s 48f (97%) 0fps Trem: 0min 1mb A-V:0.000 [4440:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 2.0s 49f (100%) 0fps Trem: 0min 1mb A-V:0.000 [4409:0] A/Vms 0/9 D/B/S 0/0/0
Pos: 2.0s 50f (100%) 0fps Trem: 0min 1mb A-V:0.000 [4378:0] A/Vms 0/9 D/B/S 0/0/0
ds_fill_buffer: EOF reached (stream: video)
Flushing video frames.
Writing index...
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Video stream: 4378.820 kbit/s (547352 B/s) size: 1094705 bytes 2.000 secs 50 frames
Uninit video: ffmpeg
WINSOCK2 uninit
deo stream: 4378.820 kbit/s (547352 B/s)
size: 1094705 bytes 2.000 secs 50 framesUninit video: ffmpegWINSOCK2
uninit
但是当我更改文件夹时，我明白了：
MEncoder Sherpya-SVN-r34401-4.6.2 (C) 2000-2011 MPlayer Team
Setting PATH to C:\Downloads\MPlayer-athlon-svn-34401\codecs
get_path('codecs.conf') -> 'C:\Users\Main/mplayer/codecs.conf'
Reading optional codecs config file C:\Users\Main/mplayer/codecs.conf: No such file or directory
Reading optional codecs config file /mingw/etc/mplayer/codecs.conf: No such file or directory
Using built-in default codecs.conf.
init_freetype
Using MMX (with tiny bit MMX2) Optimized OnScreenDisplay
get_path('fonts') -> 'C:\Users\Main/mplayer/fonts'
Configuration: --extra-cflags=-I/c/Work/mplayer/live --extra-ldflags=-lws2_32 --prefix=/mingw --enable-static --enable-md5sum --enable-menu --enable-faac --enable-enca --enable-sdl --enable-caca --enable-gl --enable-freetype --enable-png --enable-mng --enable-jpeg --enable-gif --enable-tga --enable-mad --enable-tv --enable-theora --disable-vidix --disable-faac-lavc --disable-inet6 --flavor=athlon
WINSOCK2 init: 0
STREAM: [mf] mf://C:/Users/Main/Desktop/marshmarshmarshmarsh/*.png
STREAM: Description: Multiple files input
STREAM: Author: Benjamin Zores, Albeu
STREAM: Comment:
success: format: 16 data: 0x0 - 0x0
MF file format detected.
[mf] search expr: C:/Users/Main/Desktop/marshmarshmarshmarsh/*.png
[mf] number of files: 50 (200)
==> Found video stream: 0
VIDEO: [MPNG] 560x560 24bpp 25.000 fps 0.0 kbps ( 0.0 kbyte/s)
[V] filefmt:16 fourcc:0x474E504D size:560x560 fps:25.000 ftime:=0.0400
WINSOCK2 init: 0
WINSOCK2 init: 0
[file] File size is 0 bytes
STREAM: [file] C:/Users/Main/Desktop/marshmarshmarshmarsh/Slide.avi
STREAM: Description: File
STREAM: Author: Albeu
STREAM: Comment: based on the code from ??? (probably Arpi)
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
[png @ 01235100]err{or,}_recognition separate: 2; 1
[png @ 01235100]err{or,}_recognition combined: 2; 196609
INFO: libavcodec init OK!
Selected video codec: [ffpng] vfm: ffmpeg (FFmpeg PNG)
==========================================================================
ds_fill_buffer: EOF reached (stream: video)
Flushing video frames.
Writing index...
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Video stream: nan kbit/s (-2147483648 B/s) size: 0 bytes 0.000 secs 0 frames
Uninit video: ffmpeg
WINSOCK2 uninit
这是仅使用50 png图像的测试运行。为了成功运行，我的python脚本位于包含图像的文件夹中，并告诉它将视频放在那里。 （'temp'文件夹）
失败的运行是包含图像的文件夹，但不是我的python脚本。 （'marshmarshmarshmarsh'文件夹）。它似乎发现图像很好，但不知何故无法从中产生视频。 我不知道它为什么只能在一个文件夹中工作，但是当它被告知将视频放在其他文件夹中时无法工作。
答案 0 :(得分：1)
迟到的答案：我遇到了同样的问题，尽管搜索量很大，我发现的唯一解决方法是更改到目标目录，制作视频然后切换回原始目录，如果你需要做一些进一步处理：
# Make sure the image directory exists
if not os.path.exists(img_dir):
raise Exception("\nThe directory '" + img_dir + "' does not exist !")
# Navigate to the image directory
os.chdir(img_dir)
# Sort image files
subprocess.call('dir /b /o *.png > files.txt', shell=True)
animationname = "Animation_" + foldername[:-1].lower() + "_" + scalar_to_export + ".avi"
command = ('mencoder',
'mf://@files.txt', #works only in the current dir
'-mf',
'type=png:fps='+str(fps),
'-ovc',
'lavc',
'-lavcopts',
'vcodec=mpeg4',
'-oac',
'copy',
'-o',
dirname + animationname )
subprocess.call(command)
# Switch back to the original directory
os.chdir(dirname)