[Product-Developers] Re: Capture still image from video/automatically assign P4A file image

Nate Aune natea at jazkarta.com
Fri Oct 2 19:53:20 UTC 2009 

If you go to plone4artists.org now it will redirect you to dev.plone4artists.org 
.

Brayton- it would be great if you could contribute your code to a  
branch in the collective and then we will review it at the video  
sprint in a few weeks in Budapest.

Nate

--
Nate Aune - natea at jazkarta.com
http://www.jazkarta.com
Sent from my iPhone

On Oct 2, 2009, at 3:43 PM, Jon Stahl <jonstahl at gmail.com> wrote:

> And, for the record, Nate Aune (natea at jazkarta.com), is the founder of
> the p4a project. :-)
>
> :jon
>
> On Fri, Sep 25, 2009 at 12:13 AM, Tom Gross <itconsense at gmail.com>  
> wrote:
>> p4a moved to the collective: http://dev.plone.org/old/collective/browser/p4a
>>
>> -Tom
>>
>> Brayton Osgood wrote:
>>> Espen,
>>>
>>> You do understand me correctly and I have this mostly working as you
>>> describe. It works for .mov files, though I haven't been  
>>> successful with
>>> a flash video yet - I still get the solid black background with play
>>> arrow. I'm going to keep working on that.
>>>
>>> I'm happy to share with p4a, though I haven't received anything  
>>> but a
>>> 503 error at plone4artists.org for the last few weeks. Who should  
>>> I get
>>> in touch with to share it?
>>>
>>> Thanks,
>>> Brayton
>>>
>>> On Sep 24, 2009, at 12:52 AM, Espen Moe-Nilssen wrote:
>>>
>>>> If I understand this right and you got this to work:
>>>>
>>>> 1) Add a "p4video-file" to plone
>>>> 2) The first frame of the image shows as the video/image.
>>>>
>>>> I am pretty sure the people behind p4artists would like that  
>>>> code....
>>>>
>>>>
>>>> Espen
>>>>
>>>>
>>>>
>>>> Den 23. sep. 2009 kl. 18.19 skrev Brayton Osgood:
>>>>
>>>>> Between this and IRC I've got the image capture working. Still  
>>>>> have
>>>>> to write the captured image back into Plone, but I think I have  
>>>>> that
>>>>> under control. Thanks for all the help,
>>>>>
>>>>> Brayton
>>>>>
>>>>> Here is the code I used (for future Googlers):
>>>>>
>>>>>   context = aq_inner(file)
>>>>>   movie_data = context.get_data()
>>>>>
>>>>>   movie_id, movie_name = tempfile.mkstemp('.mov',text=False)
>>>>>   image_id, image_name = tempfile.mkstemp('jpg', text=False)
>>>>>   output_id, output_name = tempfile.mkstemp()
>>>>>   wfile = open(movie_name, 'wb')
>>>>>   wfile.write(movie_data)
>>>>>   wfile.close()
>>>>>
>>>>>   args = "ffmpeg -i %s -ss 1 -an -vframes 1 -f image2 %s" %
>>>>> (movie_name, image_name)
>>>>>   p = sub.Popen(args, shell=True, stdin=sub.PIPE,  
>>>>> stdout=output_name,
>>>>> stderr=sub.STDOUT)
>>>>>
>>>>>
>>>>> On Sep 23, 2009, at 1:38 AM, Jean-Michel FRANCOIS wrote:
>>>>>
>>>>>> 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
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Product-Developers mailing list
>>>>>>> Product-Developers at lists.plone.org
>>>>>>> http://lists.plone.org/mailman/listinfo/product-developers
>>>>>>>
>>>>>> 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
>>>>> _______________________________________________
>>>>> Product-Developers mailing list
>>>>> Product-Developers at lists.plone.org
>>>>> <mailto:Product-Developers at lists.plone.org>
>>>>> http://lists.plone.org/mailman/listinfo/product-developers
>>>>
>>>
>>>
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