Does gst-omx support Raspberry Pi for simultaneously H.264 video decoding and coding?

[Peter Maersk-Moller]

The rpicamsrc is a wrapper around raspivid. The raspivid reads raw video
from the cam and encodes it for H.264 using the processors hardware
encoder. So in your pipeline you do two hardware encodings and one
decoding. Unless Broadcom did something really stupid, it should be
possible to modify rpicamsrc (using code example from raspivid or raspiyuv)
to read RGB or YUV (I420 perhaps).

Any particular reason you read FullHD at 25fps H.264 and change it to a
smaller geometry and framerate. Raspivid can take 768x432 at 5fps, but perhaps
rpicamsrc can not?

BTW, an alternative to rpicamsrc can be this

raspivid -n -w 1280 -h 720 -b 3000000 -t 0 -fps 25 -g 59 -pf high -ih -if
cyclic -o - | \
es2ts -stdin -stdout -h264 | \
gst-launch-1.0 -v -e \
    fdsrc fd=0 do-timestamp=1 ! tsdemux ! h264parse config-interval=0
........

But of course, rpicamsrc, if it is flexible enough (can't test it here
myself yet) is a way forward, a tleast until another module can read
directly from the cam.

best regards

On Wed, Jan 27, 2016 at 3:17 PM, Miguel Domingues <
miguelbrazaodomingues at gmail.com> wrote:

> I'm using gst-rpicamsrc which provides video/x-h264 format. See:
> https://github.com/thaytan/gst-rpicamsrc
>
> rpicamsrc ! video/x-h264, width=1920, height=1080, framerate=25/1 !
> h264parse ! omxh264dec ! video/x-raw ! videorate ! video/x-raw,
> framerate=5/1 ! videoscale ! video/x-raw, width=768, height=432 !
> omxh264enc ! video/x-h264 ! matroskamux ! multisocketsink
>
> The above is just part of a much bigger pipeline, that have motion
> detection, recording and more.
> It was written by looking at a bunch of C source files and is not tested,
> but the general structure is that.
> I've attached the diagram of the full pipeline.
>
>
> Miguel Domingues
>
> On Wed, Jan 27, 2016 at 1:52 PM, Peter Maersk-Moller <pmaersk at gmail.com>
> wrote:
>
>> Hi Miguel.
>>
>> The RPI camera does not encode H.264. It delivers raw video over its
>> CSI-2 connector. Then the PI might encode it. Are you sure you decode
>> encoded H.264? If yes, then you encode, decode and encode again, which is
>> impressing. Can you share your pipeline/script?
>>
>> Best regards
>> Peter
>>
>>
>> On Wed, Jan 27, 2016 at 2:24 PM, Miguel Domingues <
>> miguelbrazaodomingues at gmail.com> wrote:
>>
>>> Hi,
>>>
>>> Yes it does, at least I have a pipeline that decodes the rpi camera h264
>>> source, then does some processing with the raw video, and then re-encodes
>>> using the omx h264 encoder.
>>>
>>> Miguel
>>>
>>> Miguel Domingues
>>>
>>> On Wed, Jan 27, 2016 at 7:49 AM, zhang007z <zhang007z at gmail.com> wrote:
>>>
>>>> My issue as title, in addition to this problem, I want to know that
>>>> gst-omx
>>>> also supports what chip for H.264 decoding or coding?
>>>>
>>>> if anybody have any idea for me, thank you in advance.
>>>>
>>>>
>>>>
>>>> --
>>>> View this message in context:
>>>> http://gstreamer-devel.966125.n4.nabble.com/Does-gst-omx-support-Raspberry-Pi-for-simultaneously-H-264-video-decoding-and-coding-tp4675494.html
>>>> Sent from the GStreamer-devel mailing list archive at Nabble.com.
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