[gst-devel] 'segment->format == format' assertion failing in gstsegment when playing WM content
Andreas Schuler
andreas at neokast.com
Tue May 6 16:42:34 CEST 2008
I see. I have heard of the GstAppSrc but haven't found any documentation for
it yet. It appears as if that component would be better suited to deal with
my use case.
- What version of GStreamer contains this new GstAppSrc component?
- Can anyone point me to an example showing how to use the GstAppSrc?
- Does anyone have any suggestions as to what else I could try?
- How difficult is it to make the fakesrc produce time-based data? I have
so far stayed away from compiling GStreamer on my Windows machine, but I am
willing to give OABuild a try.
What I am trying to do basically is the following:
In my application I have the encoded raw audio and video samples. I would
like to feed them to a GStreamer pipeline for playback and I would prefer
not having to write my own plugin.
Are there any better ways to accomplish what I am trying to do? And if the
only way is to write my own source plugin, can you give me any pointers? I
am not looking for source code, just some hints that get me started quickly
and on the right track.
Thanks for all your help.
Andreas
On Tue, May 6, 2008 at 9:33 AM, Wim Taymans <wim.taymans at gmail.com> wrote:
> On Tue, 2008-05-06 at 09:05 -0500, Andreas Schuler wrote:
>
> You need to force fakesrc into producing time-based data (it produces
> byte based formats by default). Unfortunatly this is not possible yet.
>
> Wim
>
> > I have compared log entries like the following to the samples I am
> > feeding the pipeline:
> >
> > "dshowaudiodec : chain (size 768)=> pts 0:00:00.128000000 stop
> > 0:00:00.320000000"
> >
> > This line is produced by the following statement (from
> > gstdshowaudiodec.c):
> >
> > GST_CAT_DEBUG_OBJECT (dshowaudiodec_debug, adec, "chain (size %d)=>
> > pts %"
> > GST_TIME_FORMAT " stop %" GST_TIME_FORMAT,
> > GST_BUFFER_SIZE (buffer), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP
> > (buffer)),
> > GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer) +
> > GST_BUFFER_DURATION (buffer)));
> >
> > Those timestamps are matching from what I can tell and therefore look
> > ok to me.
> >
> >
> >
> > It is possible that I am not setting all necessary data on the
> > GstBuffer in the fakesrc. The following fields get set at the moment:
> > * GST_BUFFER_DATA
> > * GST_BUFFER_SIZE
> > * GST_BUFFER_TIMESTAMP
> > * GST_BUFFER_DURATION
> > * GST_BUFFER_FLAG_DISCONT (if present in source sample)
> > * GST_BUFFER_FLAG_PREROLL (if present in source sample)
> >
> > It is also worth mentioning that my fakesrc has the "is-live" property
> > set to TRUE.
> >
> > Thanks,
> >
> > Andreas
> >
> >
> > On Tue, May 6, 2008 at 1:43 AM, Felipe Contreras
> > <felipe.contreras at gmail.com> wrote:
> >
> > On Tue, May 6, 2008 at 1:41 AM, Andreas Schuler
> > <andreas at neokast.com> wrote:
> > > Hi all,
> > >
> > > I am having some trouble playing back Windows Media content.
> > >
> > > The setup is somewhat unique but necessary for my
> > application:
> > >
> > > 2 fakesrc components, which are injecting encoded audio and
> > video data
> > > Sources are connected to capsfilters, on which I am setting
> > the correct
> > > input caps (see below)
> > > Caps filters are connected to a multiqueue
> > > Queue is connected to two decoding bins
> > > Standard audio and video rendering tails (i.e. convert
> > filters, rendering
> > > sinks etc.) are connected to decoding bin source pads This
> > setup actually
> > > works fine for XVID/MP3 encoded content but I didn't have
> > any luck getting
> > > it to play with WM content. The caps I have for audio and
> > video are as
> > > follows:
> > >
> > > audio/x-wma, channels=(int)2, rate=(int)32000,
> > wmaversion=(int)2,
> > > bitrate=(int)32000, codec_data=(buffer)008800001f0000000000,
> > > block_align=(int)768, depth=(int)16
> > > video/x-wmv, width=(int)720, height=(int)496,
> > framerate=(fraction)24/1,
> > > wmvversion=(int)2, codec_data=(buffer)baf8ad00,
> > format=(fourcc)WMV2
> > >
> > > I have the same content in a regular WMV file, which is
> > playing back fine
> > > when using the playbin. I verified the caps with that setup
> > (the only
> > > difference appears to be the order of some of the fields and
> > the video
> > > framerate [the actual value is 23.97fps]):
> > >
> > > audio/x-wma, wmaversion=(int)2, bitrate=(int)32000,
> > depth=(int)16,
> > > rate=(int)32000, channels=(int)2, block_align=(int)768,
> > > codec_data=(buffer)008800001f0000000000
> > > video/x-wmv, wmvversion=(int)2, framerate=(fraction)25/1,
> > width=(int)720,
> > > height=(int)496, codec_data=(buffer)baf8ad00,
> > format=(fourcc)WMV2
> > >
> > >
> > >
> > > When trying to play the content using the setup mention
> > above I get a lot of
> > > the following messages from gstsegment.c (702):
> > >
> > > CRITICAL **: file E:\devel-release\src_releases\gstreamer
> > \gst\gstsegment.c:
> > > line 702: assertion `segment->format == format' failed
> > >
> > > Enabling the debug output reveals the following from the
> > dshow audio
> > > decoder:
> > >
> > > dshowaudiodec : received new segment from 0:00:00.000000000
> > to
> > > 99:99:99.999999999
> > > dshowaudiodec : chain (size 768)=> pts 0:00:00.000000000
> > stop
> > > 0:00:00.192000000
> > > dshowaudiodec : this buffer has a DISCONT flag
> > (0:00:00.000000000),
> > > flushing
> > > dshowaudiodec : chain (size 768)=> pts 0:00:00.128000000
> > stop
> > > 0:00:00.320000000
> > > dshowaudiodec : buffer is out of segment, start
> > 0:00:00.128000000 stop
> > > 0:00:00.256000000
> > > dshowaudiodec : buffer is out of segment, start
> > 0:00:00.256000000 stop
> > > 0:00:00.320000000
> > > dshowaudiodec : chain (size 768)=> pts 0:00:00.320000000
> > stop
> > > 0:00:00.512000000
> > > dshowaudiodec : buffer is out of segment, start
> > 0:00:00.320000000 stop
> > > 0:00:00.448000000
> > > dshowaudiodec : buffer is out of segment, start
> > 0:00:00.448000000 stop
> > > 0:00:00.512000000
> > > dshowaudiodec : chain (size 768)=> pts 0:00:00.512000000
> > stop
> > > 0:00:00.704000000
> > > dshowaudiodec : buffer is out of segment, start
> > 0:00:00.512000000 stop
> > > 0:00:00.640000000
> > > dshowaudiodec : buffer is out of segment, start
> > 0:00:00.640000000 stop
> > > 0:00:00.704000000
> > > dshowaudiodec : chain (size 768)=> pts 0:00:00.704000000
> > stop
> > > 0:00:00.896000000
> > > dshowaudiodec : buffer is out of segment, start
> > 0:00:00.704000000 stop
> > > 0:00:00.832000000
> > > dshowaudiodec : buffer is out of segment, start
> > 0:00:00.832000000 stop
> > > 0:00:00.896000000
> > >
> > > The video decoder is showing a similar picture:
> > >
> > > dshowvideodec : new segment received =>
> > start=0:00:00.000000000
> > > stop=99:99:99.999999999
> > > dshowvideodec : chain (size 1749)=> pts 0:00:00.009000000
> > stop
> > > 0:00:00.010000000
> > > dshowvideodec : this buffer has a DISCONT flag
> > (0:00:00.009000000), flushing
> > > dshowvideodec : buffer is out of segment, start
> > 0:00:00.009000000 stop
> > > 0:00:00.010000000
> > > dshowvideodec : chain (size 2972)=> pts 0:00:02.411000000
> > stop
> > > 0:00:02.412000000
> > > dshowvideodec : buffer is out of segment, start
> > 0:00:02.411000000 stop
> > > 0:00:02.412000000
> > > dshowvideodec : chain (size 3735)=> pts 0:00:02.445000000
> > stop
> > > 0:00:02.446000000
> > > dshowvideodec : buffer is out of segment, start
> > 0:00:02.445000000 stop
> > > 0:00:02.446000000
> > > dshowvideodec : chain (size 3500)=> pts 0:00:02.478000000
> > stop
> > > 0:00:02.479000000
> > > dshowvideodec : buffer is out of segment, start
> > 0:00:02.478000000 stop
> > > 0:00:02.479000000
> > > dshowvideodec : chain (size 5141)=> pts 0:00:02.545000000
> > stop
> > > 0:00:02.546000000
> > > dshowvideodec : buffer is out of segment, start
> > 0:00:02.545000000 stop
> > > 0:00:02.546000000
> > > dshowvideodec : chain (size 7849)=> pts 0:00:02.578000000
> > stop
> > > 0:00:02.579000000
> > > dshowvideodec : buffer is out of segment, start
> > 0:00:02.578000000 stop
> > > 0:00:02.579000000
> > > dshowvideodec : chain (size 5101)=> pts 0:00:02.611000000
> > stop
> > > 0:00:02.612000000
> > > dshowvideodec : buffer is out of segment, start
> > 0:00:02.611000000 stop
> > > 0:00:02.612000000
> > > dshowvideodec : chain (size 7712)=> pts 0:00:02.645000000
> > stop
> > > 0:00:02.646000000
> > > dshowvideodec : buffer is out of segment, start
> > 0:00:02.645000000 stop
> > > 0:00:02.646000000
> > >
> > >
> > > I understand that the problem appears to be that the
> > "format" in GstSegment
> > > is not of type GST_FORMAT_TIME when "gst_segment_clip" is
> > called in
> > > gstdshowaudiocodec.c. The question is why. Can anyone point
> > me in the right
> > > direction on this one?
> >
> >
> > What about the timestamps? Are those ok?
> >
> > --
> > Felipe Contreras
> > -------------------------------------------------------------------------
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