[gst-devel] ffdec_mpeg4 gets wrong frame rate from rtspsrc

[joh]

Hi Amout,

Thank you for your answer!

I've just looked at the debug messages, and found what you mentioned. Below
are the part of log.
By the way, can you explain how I can watch the video in normal speed? Does
it mean that ffmpeg duplciates frames to satisfy the frame rate what it
belives?

Regards,
Justin

*
-------------------------------------------------------------------------------------------
*gstffmpegdec.c:714:gst_ffmpegdec_setcaps:<ffdec_mpeg40> forcing 25/1
framerate

gstffmpegdec.c:744:gst_ffmpegdec_setcaps:<ffdec_mpeg40> Using framerate from
codec*
*.
.
ffmpeg gstffmpegdec.c:1130:gst_ffmpegdec_negotiate:<ffdec_mpeg40>
Renegotiating video from 0x0@ -1/-1 fps to 640x480@ -1/0 fps

ffmpeg gstffmpegcodecmap.c:1724:gst_ffmpeg_codectype_to_video_caps:
context:0x9c81c00, codec_id:13, encode:0, codec:(nil)

ffmpeg gstffmpegcodecmap.c:186:gst_ff_vid_caps_new: context:0x9c81c00,
codec_id:13, mimetype:video/x-raw-yuv

gstffmpegcodecmap.c:1602:gst_ffmpeg_pixfmt_to_caps: caps for pix_fmt=0:
video/x-raw-yuv, width=(int)640, height=(int)480, framerate=(fraction)100/1,
format=(fourcc)I420
*
-------------------------------------------------------------------------------------------
*


On Wed, Jul 22, 2009 at 1:12 AM, Arnout Vandecappelle <arnout at mind.be>wrote:

> On Monday 20 July 2009 18:11:26 joh wrote:
> > I've investigated source code, but I coudn't find where the 100/1 came
> > from. The truth is that rtspsrc doesn't even care about "a=framerate..."
> > field to create cap, and it seems like not a mandatory attribute.
> >
> > Anybody can tell me what how mp4vdepay or ffdec_mpeg4 sets frame rate?
>
>  I think it's the framerate that is set by the MPEG4 stream itself.  Try
> running with --gst-debug=ffmpeg:5 and look for 'Using framerate from
> codec'.
> If that is there, it means the MPEG4 stream specifies a framerate of
> 100fps.
> I had something similar with Sony's MPEG4 cameras.  It would surprise me
> that
> Axis does things the wrong way, but it is possible I guess...
>
>  Regards,
>  Arnout
>
> --
> Arnout Vandecappelle                               arnout at mind be
> Senior Embedded Software Architect                 +32-16-286540
> Essensium/Mind                                     http://www.mind.be
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