[gst-devel] Decodebin doesn't work whereas playbin works, why?

[Eric Zhang]

Hi, Aurelien:

    Thanks guys. I tried the way Aurelien mentioned and found out that when
I play separate video or audio streams -- that was OK. But if I combine the
two gst-launch command, error occurs. I think maybe this is a bug with
decodebin or gst-launch. According to the error message, seems that the
reason is trying to play the stream while the pipeline was not linked
completely.

    Next I am going to upgrade the gstreamer, including all plugin packages,
then try again. Thanks for all helps.

Eric Zhang

2008/9/9 Aurelien Grimaud <gstelzz at yahoo.fr>

> Do you use CVS Head ?
> Have you got video with gst-launch -v rtspsrc
> location="rtsp://localhost/test.mp4" debug=1 ! "application/x-rtp,
> media=video" ! decodebin ! xvimagesink
> Have you got audio with gst-launch -v rtspsrc
> location="rtsp://localhost/test.mp4" debug=1 ! "application/x-rtp,
> media=audio" ! decodebin ! audioconvert ! alsasink
>
> To figure out which are the differences between two pipelines
> (playbin/decodebin), one can dump dot files and draw graphs.
>
> export GST_DEBUG_DUMP_DOT_DIR=/tmp
> gst-launch ...
> dot files will be generated on every pipeline state change.(since
> gstreamer-0.10.18)
>
> Aurelien
>
> --- En date de : *Mar 9.9.08, Eric Zhang <nicolas.m.zhang at gmail.com>* a
> écrit :
>
> De: Eric Zhang <nicolas.m.zhang at gmail.com>
> Objet: Re: [gst-devel] Decodebin doesn't work whereas playbin works, why?
> À: "Discussion of the development of GStreamer" <
> gstreamer-devel at lists.sourceforge.net>
> Date: Mardi 9 Septembre 2008, 3h14
>
>
> Hi, Jens:
>
>     Thanks for your reply but it doesn't work. Rtspsrc isn't like http-src
> element, the video & audio stream are separated in it while not been
> separated in any demux element. So that means there are 2 streams coming
> from rtspsrc and each of them should be connected to a decodebin.
>
>     I tried the command you mentioned, the result is - nothing happened.
> The output is:
>
> ==============================
> eric at eric-desktop:~$ gst-launch rtspsrc
> location="rtsp://localhost/test.mp4" protocols=1 ! decodebin name=d ! queue
> ! ffmpegcolorspace ! xvimagesink  d. ! queue ! audioconvert ! alsasink
> Setting pipeline to PAUSED ...
> Pipeline is live and does not need PREROLL ...
> Setting pipeline to PLAYING ...
> New clock: GstSystemClock
> ==============================
>
> Eric Zhang
>
>
> 2008/9/8 Jens Persson <xerxes2 at gmail.com>
>
>> Hmm, try this instead:
>> gst-launch rtspsrc location="rtsp://localhost/test.mp4" protocols=1 !
>> decodebin name=d ! queue ! ffmpegcolorspace ! xvimagesink  d. ! queue !
>> audioconvert ! alsasink
>>
>> Greets Jens
>>
>> Eric Zhang wrote:
>> > Hi, gstreamer:
>> >
>> >     Recently, I wanna play movies from a rtsp server. I installed
>> > DarwinStreamServer on my laptop and use command line:
>> >
>> >     gst-launch playbin uri="rtsp://localhost/test.mp4"
>> >
>> >     It works well. But if I use decodebin instead of playbin, error
>> > occurs:
>> >
>> >     gst-launch rtspsrc location="rtsp://localhost/test.mp4"
>> > protocols=1 name=d d. ! decodebin ! queue ! ffmpegcolorspace !
>> > xvimagesink d. ! decodebin ! queue ! audioconvert ! alsasink
>> >
>> >     The error message is:
>> >
>> > =========================
>> > Setting pipeline to PAUSED ...
>> > Pipeline is live and does not need PREROLL ...
>> > Setting pipeline to PLAYING ...
>> > New clock: GstSystemClock
>> > ERROR: from element /pipeline0/d/udpsrc0: Internal data flow error.
>> > Additional debug info:
>> > gstbasesrc.c(2240): gst_base_src_loop (): /pipeline0/d/udpsrc0:
>> > streaming task paused, reason not-linked (-1)
>> > Execution ended after 117342031 ns.
>> > Setting pipeline to PAUSED ...
>> > Setting pipeline to READY ...
>> > Setting pipeline to NULL ...
>> > FREEING pipeline ...
>> > ==================================
>> >
>> >     I noticed sometimes decodebin works but mostly it fails. What
>> > tricks does playbin do to make it work? I skimed the source codes of
>> > playbin and found out that it also use decodebin inside.
>> >
>> >     Thanks a lot. I really appreciate your suggestions.
>> >
>> > Eric Zhang
>> > ------------------------------------------------------------------------
>> >
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