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Comparing jpeg images

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Pavan Patale

Comparing jpeg images

Hi,

This query is not directly related to GStreamer. But, having considered to use GStreamer framework for my application and rich multimedia experience possessed by this mailing list I am posting it here.
One of the requirement of my application is to compare jpeg images.

Does GStreamer has any support for this ?

or

Could someone pls point me to a link which has information on comparing jpeg images.

Thanks,
Pavan.

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Ramana_polaka

gst-launch command to transcode

Hi,

Can somebody please help me to in the following?

aim: to transcode

input: mpeg2 video with mp3 audio stream

output: dump with mp4 container format

/---video_queue--Mpeg2decoder--Mpeg4Encoder--\

input.mpg -->filesrc--demuxer--- -- mp4muxer--filesink--> output.mp4

\---audio_queue--Mp3decoder----AacEncoder----/

for dumping only video the following command works

-----------------------------------------------------------------------------

gst-launch filesrc location=reader_mpeg1_320.mpg ! ffdemux_mpeg name=demux demux. ! queue max-size-buffers=0 ! ffdec_mpeg2video ! ffenc_mpeg4 ! ffmux_mp4 name=muxer muxer.! filesink location=reader.mp4

for dumping video and audio how can I use the command?

Regards,

Ramana

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Wim Taymans

Re: gst-launch command to transcode

On Thu, 2008-03-20 at 16:23 +0530, Ramana Reddy Polaka wrote:

> Hi,
>
>
>
> Can somebody please help me to in the following?
>
>
>
> aim: to transcode
>
>
>
> input: mpeg2 video with mp3 audio stream
>
> output: dump with mp4 container format
>
>

I don't think it works currently, patches are welcome.

Wim

>
>
>
>
> /---video_queue--Mpeg2decoder--Mpeg4Encoder--\
>
> input.mpg
> -->filesrc--demuxer---
> -- mp4muxer--filesink--> output.mp4
>
>
> \---audio_queue--Mp3decoder----AacEncoder----/
>
>
>
> for dumping only video the following command works
>
> -----------------------------------------------------------------------------
>
>
>
> gst-launch filesrc location=reader_mpeg1_320.mpg ! ffdemux_mpeg
> name=demux demux. ! queue max-size-buffers=0 ! ffdec_mpeg2video !
> ffenc_mpeg4 ! ffmux_mp4 name=muxer muxer.! filesink
> location=reader.mp4
>
>
>
>
>
> for dumping video and audio how can I use the command?
>
>
>
> Regards,
>
> Ramana
>
>
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> This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended
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Florent THIERY-2

Re: Comparing jpeg images

In reply to this post by Pavan Patale

> One of the requirement of my application is to compare jpeg images.
> Does GStreamer has any support for this ?

What do you mean by comparing jpeg images ? Comparing the uncompressed
data (ex: motion detection), or changes in the compression settings /
huffman dict / etc... ?

Either way i don't think there's anything like that in GStreamer, not
to mention that a jpeg artifacts or captor noise could induce minor
differences even if images ar almost the sames, thus raising
differences where it's not the case.

Writing a basic image comparison plugin could be relatively easy to
do, yet i think you might be looking at image processing/vision libs
for further features (ex: OpenCV).

I don't know of any OpenCV GStreamer plugin, but i found this example
of integration:
http://www-nlpir.nist.gov/projects/tvpubs/tv6.papers/sao_paolo.pdf

Hope this helps

FLo

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