[gst-devel] playbin Vs decodebin

[alberto colombo]

I'm still trapped, and confused, by this problem:

I have a set of files, of different formats. I can open all of them
using totem and using gst-launch playbin. However, when I try

        gst-launch filesrc location=... ! decodebin ! ffmpegcolorspace !
        autovideosink
        
I either get an "internal data flow error" or the pipeline hangs, and I
need to ctrl-C it to quit.

I investigated the second case with a small application: the pipeline
doesn't want to PAUSE, it's blocked in the READY state, and
gst_element_get_state blocks if I don't use a timeout.

I'm using gstreamer 0.10.6 on the latest Ubuntu.

Thank you very much
alb


On Tue, 2006-08-29 at 16:58 +0100, alberto colombo wrote:
> Hello again
> 
> sorry for spawning the mailing list with my questions. 
> 
> I'm trying to understand why this command works:
> 
>         gst-launch-0.10 playbin uri=file:///$PWD/firefly.mp4
> 
> while this one doesn't:
> 
>         gst-launch-0.10 filesrc -t location=firefly.mp4 ! decodebin !
>         ffmpegcolorspace ! autovideosink
>         
>         Setting pipeline to PAUSED ...
>         Pipeline is PREROLLING ...
>         FOUND TAG      : found by element "qtdemux0".
>             video codec: MPEG-4 video
>         FOUND TAG      : found by element "qtdemux0".
>             audio codec: MPEG-4 AAC audio
>         FOUND TAG      : found by element "qtdemux0".
>                   title: The Train Job
>                  artist: Firefly
>                   album: Season 1
>            track number: 2
>             track count: 14
>                   genre: TV Shows
>         ERROR: from element /pipeline0/decodebin0/queue0: Internal data
>         flow error.
>         Additional debug info:
>         gstqueue.c(783): gst_queue_push_one
>         (): /pipeline0/decodebin0/queue0:
>         streaming stopped, reason not-negotiated
>         ERROR: pipeline doesn't want to preroll.
>         Setting pipeline to NULL ...
>         FREEING pipeline ...
> 
> And neither does this one:
> 
>         gst-launch-0.10 filesrc -t location=firefly.mp4 !
>         ffdemux_mov_mp4_m4a_3gp_3g2 ! ffdec_mpeg4  ! ffmpegcolorspace !
>         autovideosink
>         
>         Setting pipeline to PAUSED ...
>         Pipeline is PREROLLING ...
>         FOUND TAG      : found by element
>         "ffdemux_mov_mp4_m4a_3gp_3g20".
>             video codec: MPEG-4 compatible video
>         FOUND TAG      : found by element
>         "ffdemux_mov_mp4_m4a_3gp_3g20".
>             audio codec: MPEG-2/4 AAC audio
>         
>         (and here it hangs)
>         
> The file used is:
>         file firefly.mp4
>         firefly.mp4: ISO Media, MPEG v4 system, version 2
>         
>         gst-typefind-0.10 firefly.mp4
>         firefly.mp4 - audio/x-m4a
>         
> I would like to use the decodebin, and I know gstreamer can read that
> file somehow, but I just can't figure out how...
> Thank you very much again
> alb
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