[gst-devel] distorted video encoded with x264

[Tim-Philipp Müller]

On Thu, 2010-12-16 at 01:11 -0300, Rafael Sousa wrote:

> When I use the x264 build 85 that issue doesn't occur, the video is
> perfect, only in superior build that I tested (98 and 110) that the
> problem occur. I don't have any idea of what can be happening, I've
> already removed and installed the packages several times, I even
> upgraded my ubuntu system from 10.04 to 10.10 but no change. Anyone
> have any idea? I've tried all that I know. I need to use the build 98
> or superior.

Just as a note, the x264enc plugin code has some special handling here
and there depending on the x264 version compiled against. It assumes
that the x264 version used at runtime is actually the one it was
compiled against as well at the moment. This can lead to weird things
happening when you upgrade/downgrade libx264 to a different version than
the plugin was compiled against.

So when you upgrade/downgrade libx264, you definitely need to recompile
gst-plugins-ugly.

(There may still be a bug of course..)
 
 Cheers
  -Tim


> thanks for the reply
> 
> Message: 1
>         Date: Wed, 15 Dec 2010 15:42:01 -0500
>         From: Timothy Braun <braunsquared at gmail.com>
>         Subject: Re: [gst-devel] distorted video encoded with x264
>         To: Discussion of the development of GStreamer
>                <gstreamer-devel at lists.sourceforge.net>
>         Message-ID: <69C57452-40E4-4172-883F-DF374D355CD7 at gmail.com>
>         Content-Type: text/plain; charset="us-ascii"
>         
>         I'm no expert on this, but ran into similar issues when making
>         a local file. It ultimately ended up being the parameters I
>         was passing to the x264enc element. I would take a look at
>         those with gst-inspect and see if you can tune the output.
>         Most notably the pass and quantizer parameters.
>         
>         Tim
>         
>         Sent from my iPhone
>         
>         On Dec 15, 2010, at 3:02 PM, Rafael Sousa
>         <rafael.lmsousa at gmail.com> wrote:
>         
>         > Hi all,
>         >
>         > I'm using the versions of gstreamer installed from ubuntu
>         10.10 apt-get. I've installed the gstreamer, gst-plugins-bad,
>         gst-plugins-good, gst-plugins-ugly, gst-ffmpeg and I've
>         installed the x264.
>         >
>         > The problem is that my pipeline gives as result a blurring
>         video. My pipeline works to read a YUV file at the sender,
>         encodes it in H.264, and sends it to receiver using RTP in
>         encoding time. At the receiver, it receives the stream and
>         stores it in YUV format again for posterior process. The
>         pipeline is as follows:
>         >
>         > Sender:
>         >
>         > "gstrtpbin name=rtpbin filesrc location=paris_cif.yuv
>         blocksize=152064 ! video/x-raw-yuv, width=352, height=288,
>         framerate=(fraction)15/1, format=(fourcc)I420 ! x264enc,
>         key-int-max=30, key-int-min=15, intra-refresh=true !
>         rtph264pay ! rtpbin.send_rtp_sink_0 rtpbin.send_rtp_src_0 !
>         udpsink host=127.0.0.1 port=5000 rtpbin.send_rtcp_src_0 !
>         udpsink host=5003 port=5001 sync=false async=false udpsrc
>         port=5005 ! rtpbin.recv_rtcp_sink_0 "
>         >
>         > Receiver:
>         >
>         > "gstrtpbin name=rtpbin udpsrc caps=
>         \"application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)H264" port=5000 ! rtpbin.recv_rtp_sink_0 rtpbin. ! rtph264depay ! ffdec_h264 ! filesink location=example.yuv udpsrc port=5001 ! rtpbin.recv_rtcp_sink_0 rtpbin.send_rtcp_src_0 ! udpsink port=5005 sync=false async=false"
>         >
>         > I don't know why the video is blurring since I've tested it
>         localhost, without loss rates. The command that I'm using to
>         watch the result is:
>         >
>         > mplayer example.yuv -demuxer rawvideo -rawvideo cif
>         >
>         > I took a screenshot of the video, it is in annex. Please,
>         anyone can help?
>         >
>         > thanks in advance
>         > <Captura_de_tela.png>
>         >
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