[Rock-dev] Avi export for log files

[Alexander Duda]

On 06/24/2013 01:16 PM, Fabian Franzen wrote:
> Hmm, i am not sure if this is the optimal solution... When I create a
> presentation quickly at 1 o'clock in the morning i normally doesn't want
> to look up ffmpeg commands or write a script to connect some exisiting
> tasks to do video encoding. ;-)
>
> I took a quick lock at the source code and noticed that rock-export
> uses the frame helper to export the images using opencv. OpenCV also
> provides a nice way to export and encode multiple pictures as mpg or
> h264 video...
We had some problems with hd images and OpenCV when converting to a video.
>
> Is there interest in a patch for rock-export that adds a way to
> directly export camera pictures to an h264 or mpg avi? If there is some
> interest, then i will try to add it ;-)
Sounds great. But for me this would be only a temporarily solution 
because wrapping functions of an existing library (opencv) into second 
one (frame_helper) just for interfacing with ruby without adding real 
functionality has a bad taste. The same is true for putting libraries 
into orocos components just for the sake of pushing log data into the 
libraries.

In the long run my preferred solution would be to directly interface 
opencv or other libraries with ruby. We are not there, yet. Therefore 
your proposed solution might be a helpful tool for the next couple of 
months. Nevertheless we have full OpenCV 2.4.9 bindings for ruby in an 
experimental stage. As soon as we can release it rock-export would 
directly use OpenCV to export frames as png,jpgs,avi,...

Greets
Alex

>
> Regards,
> Fabian
>
> Am 2013-06-21 08:32, schrieb Steffen Planthaber:
>> Hi,
>>
>>   After you got the export of several frames, from rock-export giving
>> i.e. --start 0 --end 100, you can use ffmpeg to put them together in
>> any format. ffmpeg (mplayer) supports it by using the "image2" format
>> as input for ffmpeg:
>>
>>   $> ffmpeg -f image2 image%02d.png out.mpg
>>
>>   puts together all images with a two digit number image01.png,
>> image02.png
>>
>>   You'll need leading zeros for a correct order in the video.
>>   I don't knot the output filename of rock-export, but the "%02d" is
>> for two digit numbers, %03d for three.
>>
>>   For bitrates, resolution and stuff see the ffmpeg manual.
>>
>>   Best,
>>   Steffen
>>
>>   Am 21.06.2013 00:35, schrieb Fabian Franzen:
>>
>>> Hi,
>>>
>>> is it possible in rock to convert/export a log file with frames to a
>>> movie file format like MPEG or avi? If looked around in rock and today
>>> and the only way I found is via the png/jpeg export of rock-export...
>>> I have tried that command with my log file but no pictures was
>>> created...
>>>
>>> My idea was to export a camera log of avalon for the open campus day.
>>> I finally used some non rock log files for this, but I can't belive
>>> that there is no easy way for rock log files....
>>>
>>> Regards
>>> Fabian
>>>
>>> _______________________________________________
>>> Rock-dev mailing list
>>> Rock-dev at dfki.de
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>> --
>>   Steffen Planthaber
>>   Weltraumrobotik
>>
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-- 
Dipl.-Ing. Alexander Duda
Unterwasserrobotik

DFKI Bremen
Robotics Innovation Center
Robert-Hooke-Straße 5
28359 Bremen, Germany

Phone: +49 (0)421 178-456620
Fax:   +49 (0)421 178-454150
E-Mail: alexander.duda at dfki.de

Weitere Informationen: http://www.dfki.de/robotik
-----------------------------------------------------------------------
Deutsches Forschungszentrum fuer Kuenstliche Intelligenz GmbH
Firmensitz: Trippstadter Straße 122, D-67663 Kaiserslautern
Geschaeftsfuehrung: Prof. Dr. Dr. h.c. mult. Wolfgang Wahlster
(Vorsitzender) Dr. Walter Olthoff
Vorsitzender des Aufsichtsrats: Prof. Dr. h.c. Hans A. Aukes
Amtsgericht Kaiserslautern, HRB 2313
Sitz der Gesellschaft: Kaiserslautern (HRB 2313)
USt-Id.Nr.:    DE 148646973
Steuernummer:  19/673/0060/3