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

[Brayton Osgood]

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
>> http://lists.plone.org/mailman/listinfo/product-developers
>

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