Trying to encode a captured frame as a Bitmap (.bmp)

[Nicolas Dufresne]

Le 22 déc. 2017 12:40 PM, "Jack D" <jackstuff3 at gmail.com> a écrit :

I found a file in gst-plugins-base/gst-libs/gst/pbutils named
descriptions.c and listed in the file are image formats with static
descriptions. I created a test and from all these 27 formats, only two
worked correctly and allowed me to save an image: image/jpeg and image/png.
Also, upon closer examination using gst-inspect-1.0, I could only find
three elements that state explicitly they encode image files. pnmenc,
jpegenc and pngenc. So, is this just a limitation? I can create a bitmap
using gst-launch but I cannot create one using gst_video_convert_sample.
Is there a guide somewhere that explains using the output of
gst-lauinch-1.0 -v, I can take all the srcs and sinks listed and create the
correct pipeline in my program?


If there is a rationale it is likely the rank, this is printed by
gst-inspect. Only ranked element will be autoplug. Jpeg and PNG is by far
the majority of the formats in use today.


Best Regards,
Jack

On Thu, Dec 21, 2017 at 3:13 PM, Jack D <jackstuff3 at gmail.com> wrote:

> I did notice that error on my part but image/bmp or image/bitmap, neither
> of these work.
>
> On Thu, Dec 21, 2017 at 2:25 PM, Antonio Ospite <ao2 at ao2.it> wrote:
>
>> On Thu, 21 Dec 2017 13:33:24 -0700
>> Jack D <jackstuff3 at gmail.com> wrote:
>>
>> > I get the same result doing gst-inspect-1.0 with those parameters.
>> >
>> > VIDEO:/home/user % gst-inspect-1.0 | grep bitmap
>> > libav:  avdec_bmp: libav BMP (Windows and OS/2 bitmap) decoder
>> > libav:  avenc_bmp: libav BMP (Windows and OS/2 bitmap) encoder
>> > VIDEO:/home/user % gst-inspect-1.0 avenc_bmp | grep image
>> >       image/bmp
>> >
>> >  The only difference I see is my search has avdec_bmp listed first.
>> > Has anyone ever successfully saved a bitmap file from inside a program
>> > using gst_video_convert_sample?
>> [...]
>>
>> Your program should work, I was trying to point out that you have to use
>> image/bmp instead of image/bitmap.
>>
>> Ciao,
>>    Antonio
>>
>> --
>> Antonio Ospite
>> https://ao2.it
>> https://twitter.com/ao2it
>>
>> A: Because it messes up the order in which people normally read text.
>>    See http://en.wikipedia.org/wiki/Posting_style
>> Q: Why is top-posting such a bad thing?
>>
>
>

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