H264 problems

[Gary Thomas]

Based on the previous discussions, I'm trying to get the H264
encoding to work in the simplest of cases.  In this light, I'm
trying to just grab some data and encode it.  I have two pipeline
setups with different encoders.  One works and the other just
stalls.

Why would this one work
   gst-launch -v v4l2src num-buffers=200 ! 'video/x-raw-yuv,width=720,height=480' ! \
      TIVidenc1 codecName=h264enc engineName=codecServer ! filesink location=/tmp/test.h264
and this one stall?
   gst-launch -v v4l2src num-buffers=200 ! 'video/x-raw-yuv,width=720,height=480,format=(fourcc)UYVY' ! \
     ffmpegcolorspace ! 'video/x-raw-yuv,width=720,height=480,format=(fourcc)I420' ! x264enc ! filesink location=/tmp/hold.h264

I checked and there is [plenty of] definitely data going into x264enc

Note: the extra ffmpegcolorspace step is there to massage the data
format since my sensor can only do UYVY, but x264enc can only handle
I420.

These components are all from the latest released versions.

n.b. I was told to ask on IRC, but that's not really an option
for me, so this mailing list is my access.

Thanks

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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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[Andrey Nechypurenko-2]

> and this one stall?
>
>gst-launch -v v4l2src num-buffers=200 !
>    'video/x-raw-yuv,width=720,height=480,format=(fourcc)UYVY' !
>    \ ffmpegcolorspace !
>    'video/x-raw-yuv,width=720,height=480,format=(fourcc)I420' !
>    x264enc ! filesink location=/tmp/hold.h264

I would suggest to try the following. Run your pipeline with
increased debug level, i.e. GST_DEBUG=3 gst-launch ... and search
for any relevant messages which might give you the hint about
what is going wrong. In addition, I remember some strange
behavior got fixed by explicitly mentioning the framerate. In
your case, for example, in caps filter right after v4l2src add
framerate=30/1 or whatever is appropriate frame rate for your
camera.

In addition, since you are using gstreamer on TI platform, you
can consider asking the question also here:
https://gstreamer.ti.com/gf/project/gstreamer_ti/forum/?action=ForumBrowse&forum_id=187

Regards,
Andrey.

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[Gary Thomas]

On 09/21/2010 02:43 AM, Andrey Nechypurenko wrote:

>> and this one stall?
>>
>> gst-launch -v v4l2src num-buffers=200 !
>>     'video/x-raw-yuv,width=720,height=480,format=(fourcc)UYVY' !
>>     \ ffmpegcolorspace !
>>     'video/x-raw-yuv,width=720,height=480,format=(fourcc)I420' !
>>     x264enc ! filesink location=/tmp/hold.h264
>
> I would suggest to try the following. Run your pipeline with
> increased debug level, i.e. GST_DEBUG=3 gst-launch ... and search
> for any relevant messages which might give you the hint about
> what is going wrong. In addition, I remember some strange
> behavior got fixed by explicitly mentioning the framerate. In
> your case, for example, in caps filter right after v4l2src add
> framerate=30/1 or whatever is appropriate frame rate for your
> camera.

I sure don't see anything, perhaps someone that understands this better
can.  I put a level 4 dump of this at http://pastebin.com/iDDVuHgv

>
> In addition, since you are using gstreamer on TI platform, you
> can consider asking the question also here:
> https://gstreamer.ti.com/gf/project/gstreamer_ti/forum/?action=ForumBrowse&forum_id=187

Except that my problem is not with any of the TI components - it's
only the off-the-shelf encoder that stalls.

--
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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