Tom Gross a écrit :
Hi Brayton,
p4a-video uses the File-content-type, which again uses OFS.File as
content-class. If you want to access the raw-data use:
atfileobject.getFile().data
or
str(atfileobject.getFile())
If you need a file-like object, you have to do:
stream = StringIO(str(atfileobject.getFile()))
HTH
-Tom
Brayton Osgood wrote:
I'm trying to extend P4A Video to automatically generate the file images
that can be added to each video via the edit panel of any IVideoEnhanced
content. Ideally, the result will be an adapter (I think) that responds
to the IVideoEnhanced interface.
Right now I'm running into trouble capturing an image from a video file
once it's stored in Plone. I've tried calling ffmpeg as a subprocess,
but I get an I/O error (see below):
image = subprocess.Popen('ffmpeg -i moviefile -ss 1 -an -vframes 1
-f image2 thumb%2d.jpg', shell=True, stdin=subprocess.PIPE,
stdout=subprocess.PIPE, stderr=subprocess.STDOUT, close_fds=True)
print image.stdout.read()
FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2007 Fabrice Bellard, et
al.
configuration: --enable-gpl --enable-pp --enable-swscaler
--enable-pthreads --enable-libvorbis --enable-libtheora --enable-libogg
-- enable-libgsm --enable-dc1394 --disable-debug --enable-shared
--prefix=/usr
libavutil version: 1d.49.3.0
libavcodec version: 1d.51.38.0
libavformat version: 1d.51.10.0
built on Mar 16 2009 21:19:49, gcc: 4.2.4 (Ubuntu 4.2.4-1ubuntu3)
moviefile: I/O error occured
Usually that means that input file is truncated and/or corrupted.
I've tried doing this where 'moviefile' is an <ATFile at
/Plone/Members/brayt/jumping2.mov> object, a <p4a.video _ATCTFileVideo>
object (applying the IVideo interface to the ATFile), and even the
binary data (passed by moviefile.getData()). Each case gives me the same
error.
I suspect this is because ffmpeg expects to receive certain file types,
and Plone files are somehow wrapped so they aren't recognized. I guess
my question may boil down to how do I access (and do something useful
with) the data in a file that's not normally read by Plone? I suspect
that the indexing of PDFs behaves similarly to what I'm hoping to do,
but I haven't quite figured out how that works.
Any help would be greatly appreciated!
Thanks much,
Brayton
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To call it with subprocess :
- use mkstemp python module to create a temp file
- write the raw data inside it
- do the subprocess on that new tempfile
- don't forget to delete the temp file
- write the image inside your image field.
--
Cordialement,
Jean-Michel FRANCOIS
Makina-Corpus
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