[gst-devel] 'segment->format == format' assertion failing in gstsegment when playing WM content

Tue May 6 16:05:48 CEST 2008

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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