[gst-devel] gst_capsfilter_prepare_buf....assertion failed

nikhil almalkar nikhil.almalkar at gmail.com
Tue Apr 14 10:37:41 CEST 2009 

Hi all,

Im using following pipeline ::

gst_element_link_many (source, flt1, encoder, decoder, ffmpegcolorcon,
scale, videosink, NULL);

source is a filesrc, with blocksize and location specified.. the flt1
specifies the height, width, yuv format, (for input is a raw stream),
framerate. Everything seems to be normal to me.

But when i try to run it... it stops after 3 frames saying unexpected end of
stream.... ive checked the file and there are 300 odd frames and there isn't
any prob with that.

There are a few warnings as these two frames are decoded.:::::

gst_base_transform_acceptcaps:<scale> transform could not transform
video/x-raw-yuv, width=(int)352, height=(int)288, framerate=(fraction)5/1,
format=(fourcc)I420, pixel-aspect-ratio=(fraction)1/1 in anything we support
(othercaps (NULL))

gst_base_transform_acceptcaps:<colorconversion> transform could not
transform video/x-raw-rgb, bpp=(int)32, depth=(int)24, endianness=(int)4321,
red_mask=(int)65280, green_mask=(int)16711680, blue_mask=(int)-16777216,
width=(int)512, height=(int)256, framerate=(fraction)5/1,
pixel-aspect-ratio=(fraction)1/1 in anything we support (othercaps (NULL))

gst_base_transform_acceptcaps:<colorconversion> transform could not
transform video/x-raw-rgb, bpp=(int)32, depth=(int)24, endianness=(int)4321,
red_mask=(int)65280, green_mask=(int)16711680, blue_mask=(int)-16777216,
width=(int)512, height=(int)256, framerate=(fraction)5/1,
pixel-aspect-ratio=(fraction)1/1 in anything we support (othercaps (NULL))

in that order...

also .. the log says
ffmpeg :0:: Warning: AVFrame.pts=? trying to guess (4)
 ffmpeg :0:: Warning: AVFrame.pts=? trying to guess (4)
ffmpeg :0:: Warning: AVFrame.pts=? trying to guess (5)
ffmpeg :0:: Warning: AVFrame.pts=? trying to guess (6)
  ffmpeg :0:: Warning: AVFrame.pts=? trying to guess (7)
ffmpeg :0:: Warning: AVFrame.pts=? trying to guess (8)
 ffmpeg :0:: Warning: AVFrame.pts=? trying to guess (9)
ffmpeg :0:: Warning: AVFrame.pts=? trying to guess (10)
  ffmpeg :0:: Warning: AVFrame.pts=? trying to guess (11)
and so on to the last frame....

what do you reccon the problem is?

Regards
Nikhil.
On Mon, Apr 13, 2009 at 7:17 PM, nikhil almalkar
<nikhil.almalkar at gmail.com>wrote:

> It worked...
> Thanks anyway.
>
> Regards,
>
> Nikhil.
>
>
> On Mon, Apr 13, 2009 at 6:45 PM, nikhil almalkar <
> nikhil.almalkar at gmail.com> wrote:
>
>> i did..
>> caps after filesrc :
>>
>> g_object_set (G_OBJECT (flt1), "caps", gst_caps_new_simple
>> ("video/x-raw-yuv",
>>
>> "format",GST_TYPE_FOURCC, GST_MAKE_FOURCC ('I','4','2','0'),
>>
>> "width",G_TYPE_INT,(gint)value2,
>>
>> "height",G_TYPE_INT,(gint)value1,"framerate", GST_TYPE_FRACTION, 25, 1,
>>                                     NULL),NULL);
>>
>> i think i hv gotten rid of that problem ... but now there is another
>> exception
>>
>> ::gst_ffmpegenc_chain_video: assertion `frame_size == GST_BUFFER_SIZE
>> (inbuf)' failed
>>
>> the pipeline :::
>>
>>
>> pipeline = gst_pipeline_new ("player");
>> source = gst_element_factory_make ("filesrc", "source");
>> g_object_set (G_OBJECT (source), "location", Inputfile, NULL);
>>
>>     flt1 = gst_element_factory_make ("capsfilter","flt1");
>>    g_object_set (G_OBJECT (flt1), "caps", gst_caps_new_simple
>> ("video/x-raw-yuv",
>>
>> "format",GST_TYPE_FOURCC, GST_MAKE_FOURCC ('I','4','2','0'),
>>
>> "width",G_TYPE_INT,(gint)value2,
>>
>> "height",G_TYPE_INT,(gint)value1,"framerate", GST_TYPE_FRACTION, 25, 1,
>>                                     NULL),NULL);
>>
>>
>>     encoder = gst_element_factory_make ("ffenc_mpeg2video", "encoder");
>>         //g_print("%f  %f", value4,value3 );
>>     g_object_set (G_OBJECT (encoder), "bitrate",
>> (glong)value4,"buffer-size", (glong)value3, NULL);
>>
>> /////////////////////////////////
>>
>> the capsfilter element is linked between the filesrc and the encoder as
>> you would've guessed.
>>
>> there also is a decoder following this.. but first i need to figure this
>> out...
>> i have specified the buffer size as the standard yuv 4:2:0 cif framesize..
>> still the exception is ther. (i.e. 152064)...
>>
>>
>> thank you for your time,
>>
>> Regards,
>> Nikhil.
>>
>>
>> On Mon, Apr 13, 2009 at 5:34 PM, ved kpl <ved.kpl at gmail.com> wrote:
>>
>>> Did you specify caps after the filesrc element.?
>>> Can you tell us, what you pipeline looks like?
>>>
>>> ~Regards
>>> Ved
>>>
>>> On Mon, Apr 13, 2009 at 12:32 PM, nikhil almalkar
>>> <nikhil.almalkar at gmail.com> wrote:
>>> > Hi all,
>>> >
>>> > I'm facing a problem in a pipeline that uses ffenc_mpeg2video and
>>> > ffdec_mpeg2video plugins.
>>> >
>>> > I have used a capsfilter to link a filesrc that reads a raw yuv file to
>>> be
>>> > encoded. But whenever i run the app it says
>>> >
>>> > gst_capsfilter_prepare_buf: assertion `out_caps != NULL' failed
>>> > basetransform
>>> > gstbasetransform.c:1372:gst_base_transform_prepare_output_buffer:<flt1>
>>> > pad-alloc failed: error
>>> > basetransform
>>> > gstbasetransform.c:1925:gst_base_transform_handle_buffer:<flt1> could
>>> not
>>> > get buffer from pool:
>>> >
>>> > any and all inputs are appreciated.
>>> >
>>> > Thanks in advance.
>>> >
>>> > Regards,
>>> > Nikhil.
>>> >
>>> >
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