[gst-devel] Bugs in ffenc_*/ffdec_*?

[Edward Hervey]

Hi,

On 8/14/06, Deeptendu Bikash <dbikash at gmail.com> wrote:
> Hi,
>
>  Are there known bugs with ffenc/ffdec pair? If I encode a file with a ffenc
> of a particular codec, then I should be able to decode the file using ffdec
> of the same codec, right?
>
>  I tried with h263 and mpeg4, but got the same result:
>
>  gst-launch  videotestsrc ! ffenc_mpeg4 ! filesink location=videotestsrc.m4v
>  gst-launch filesrc location=videotestsrc.m4v ! caps="video/mpeg,
> width=(int)320, height=(int)240, framerate=(fraction)30/1,
> mpegversion=(int)4, systemstream=(boolean)false" ffdec_mpeg4 !
> ffmpegcolorspace ! xvimagesink

  Saving compressed video in a file will never be playable, except for
some specific formats that create buffers with headers that can be
parsed outside of a container. You need to put it in a container
format, like avi, mov or ogg. Try using avimux/avidemux.

  gst-launch  videotestsrc ! ffenc_mpeg4 ! avimux ! filesink
location=videotestsrc.m4v
  gst-launch filesrc location=videotestsrc.m4v ! avidemux ! ffdec_mpeg4 !
ffmpegcolorspace ! xvimagesink

  Note : I didn't try these pipelines, it's just to show how it should be done.

>
>  ERROR: from element /pipeline0/ffdec_mpeg40: Internal GStreamer error:
> negotiation problem.  Please file a bug at
> http://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer.
>  Additional debug info:
>  gstffmpegdec.c(1276): gst_ffmpegdec_chain (): /pipeline0/ffdec_mpeg40:
>  ffdec_mpeg4: input format was not set before data start
>  ERROR: pipeline doesn't want to preroll.
>
>  Any suggestions?
>
>  Thanks,
>  Deeptendu
>
>  Note: For MPEG1 and 2 Video, I used
> ffenc_mpeg1video/ffenc_mpeg2video and mpeg2dec, and this
> worked.
>
>
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>

Edward

-- 
Edward Hervey
Multimedia editing developer / Fluendo S.A.
http://www.pitivi.org/