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A question for avimux in gstreamer

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Zhang Yanlong-PBVM47

A question for avimux in gstreamer

Pals,

I have a question for avimux in gstreamer.

Pls look through the function "gst_avi_mux_audsink_set_caps" in file "gstavimux.c"

There are following lines at the end of this function:

avipad->parent.hdr.rate = avipad->auds.blockalign * avipad->auds.rate;
avipad->parent.hdr.samplesize = avipad->auds.blockalign;
avipad->parent.hdr.scale = 1;

My question is that why the program does "avipad->auds.blockalign * avipad->auds.rate" when calculating avipad->parent.hdr.rate.

When I playback a avifile which is generated by gstreamer avimux (YUV420 video data and PCM audio data <depth: 16, width: 16, 2 channels>), the time lapsesvery slowly on player (Windows media player). The time progress bar just passes 1 second but the real time passes 4 seconds.

If I change the code to "avipad->parent.hdr.rate = avipad->auds.rate;", the file is played well.

So I am not sure if there is some problem at this point.

Thanks a lot.

BRs

Zhang yanlong

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Mark Nauwelaerts-2

Re: A question for avimux in gstreamer

There is indeed a bit of a bug there in avimux, as already noted in
http://bugzilla.gnome.org/show_bug.cgi?id=511489
A patch given there addresses it pretty much the way you indicate.

Regards,
Mark.

Zhang Yanlong-PBVM47 wrote:

> Pals,
> I have a question for avimux in gstreamer.
>
> Pls look through the function "gst_avi_mux_audsink_set_caps" in file
> "gstavimux.c"
> There are following lines at the end of this function:
>
> *avipad->parent.hdr.rate = avipad->auds.blockalign * avipad->auds.rate;*
> avipad->parent.hdr.samplesize = avipad->auds.blockalign;
> avipad->parent.hdr.scale = 1;
>
> My question is that why the program does "*avipad->auds.blockalign *
> avipad->auds.rate*" when calculating *avipad->parent.hdr.rate*.
>
> When I playback a avifile which is generated by gstreamer avimux (YUV420
> video data and PCM audio data <depth: 16, width: 16, 2 channels>), the
> time lapsesvery slowly on player (Windows media player). The time
> progress bar just passes 1 second but the real time passes 4 seconds.
>
> If I change the code to "*avipad->parent.hdr.rate =
> avipad->auds.rate;*", the file is played well.
>
> So I am not sure if there is some problem at this point.
>
> Thanks a lot.
>
> BRs
> Zhang yanlong
> **
>
>
>
> ------------------------------------------------------------------------
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by the 2008 JavaOne(SM) Conference
> Don't miss this year's exciting event. There's still time to save $100.
> Use priority code J8TL2D2.
> http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel

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Zhang Yanlong-PBVM47

Re: A question for avimux in gstreamer

Mark,
Yes, it works well.
Very thanks for your helps.

BRs
Zhang Yanlong

-----Original Message-----
From: Mark Nauwelaerts [mailto:[hidden email]]
Sent: Tuesday, May 13, 2008 6:21 AM
To: Zhang Yanlong-PBVM47
Cc: [hidden email]
Subject: Re: [gst-devel] A question for avimux in gstreamer

There is indeed a bit of a bug there in avimux, as already noted in
http://bugzilla.gnome.org/show_bug.cgi?id=511489
A patch given there addresses it pretty much the way you indicate.

Regards,
Mark.

Zhang Yanlong-PBVM47 wrote:
> Pals,
> I have a question for avimux in gstreamer.
>
> Pls look through the function "gst_avi_mux_audsink_set_caps" in file
> "gstavimux.c"
> There are following lines at the end of this function:
>
> *avipad->parent.hdr.rate = avipad->auds.blockalign *
avipad->auds.rate;*

> avipad->parent.hdr.samplesize = avipad->auds.blockalign;
> avipad->parent.hdr.scale = 1;
>
> My question is that why the program does "*avipad->auds.blockalign *
> avipad->auds.rate*" when calculating *avipad->parent.hdr.rate*.
>
> When I playback a avifile which is generated by gstreamer avimux
> (YUV420 video data and PCM audio data <depth: 16, width: 16, 2
> channels>), the time lapsesvery slowly on player (Windows media
> player). The time progress bar just passes 1 second but the real time

passes 4 seconds.

>
> If I change the code to "*avipad->parent.hdr.rate =
> avipad->auds.rate;*", the file is played well.
>
> So I am not sure if there is some problem at this point.
>
> Thanks a lot.
>
> BRs
> Zhang yanlong
> **
>
>
>
> ----------------------------------------------------------------------
> --
>
> ----------------------------------------------------------------------
> --- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference
> Don't miss this year's exciting event. There's still time to save

$100.

> Use priority code J8TL2D2.
> http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com
> /javaone
>
>
> ----------------------------------------------------------------------
> --
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel