[gst-plugins-base-0.10.32] playbin2 detects 'text/x-ssa' not 'application/x-ssa' or 'application/x-ass' when play ass subtitle

[bcxa sz]

Hi Developer,

Just tried one avi file with .ass subtitle and found that there is no
approprate subtitle element picked up by playbin2 because the type
found is 'text/x-ssa'.

And the caps of ssaparse is 'application/x-ssa' or
'application/x-ass'. So it seemed that the gstreamer had issue to
playback .ass/.ssa subtitle.

[liud@fedora14 x86-source]$ gst-launch playbin2
uri=file:///mnt/winhost/sub_9/SUB-08.avi
suburi=file:///mnt/winhost/sub_9/SUB-08.en.ass  --gst-debug=2
PROP_URI file:///mnt/winhost/sub_9/SUB-08.avi
PROP_SUBURI file:///mnt/winhost/sub_9/SUB-08.en.ass
Setting pipeline to PAUSED ...
0:00:00.296188803 13473  0x9d7f070 WARN                 default
descriptions.c:985:gst_pb_utils_get_codec_description: No description
available for media type: text/x-ssa
0:00:00.296533109 13473  0x9d7f070 WARN            uridecodebin
gsturidecodebin.c:756:unknown_type_cb:<uridecodebin1> warning: No
decoder available for type 'text/x-ssa'.
0:00:00.296657752 13473  0x9d7f070 WARN              decodebin2
gstdecodebin2.c:3152:gst_decode_bin_expose:<decodebin20> No suitable
plugins found
0:00:00.296682904 13473  0x9d7f070 WARN              decodebin2
gstdecodebin2.c:3154:gst_decode_bin_expose:<decodebin20> error: no
suitable plugins found
0:00:00.296758082 13473  0x9d7f070 WARN                 default
descriptions.c:985:gst_pb_utils_get_codec_description: No description
available for media type: text/x-ssa
0:00:00.296835774 13473  0x9d7f070 WARN              decodebin2
gstdecodebin2.c:1567:analyze_new_pad:<decodebin20> error: A text/x-ssa
decoder plugin is required to play this stream, but not installed.
0:00:00.296868193 13473  0x9d7f070 WARN              decodebin2
gstdecodebin2.c:1567:analyze_new_pad:<decodebin20> error: No decoder
to handle media type 'text/x-ssa'
0:00:00.311817004 13473  0x9ed4230 WARN                 basesrc
gstbasesrc.c:2574:gst_base_src_loop:<source> error: Internal data flow
error.

[liud@fedora14 x86-source]$ gst-inspect ssaparse
Pad Templates:
  SINK template: 'sink'
    Availability: Always
    Capabilities:
      application/x-ssa
      application/x-ass

Please let me know whether I am wrong. If I am correct, I will raise
one bugzilla.

best regards

BCXA
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[Sebastian Dröge-7]

On Wed, 2011-08-24 at 13:22 +0800, bcxa sz wrote:
> Hi Developer,
>
> Just tried one avi file with .ass subtitle and found that there is no
> approprate subtitle element picked up by playbin2 because the type
> found is 'text/x-ssa'.
>
> And the caps of ssaparse is 'application/x-ssa' or
> 'application/x-ass'. So it seemed that the gstreamer had issue to
> playback .ass/.ssa subtitle.

Hi,
this happens because there's no real typefinder for SSA subtitles and
the XDG typefinder uses the "official" mimetype for SSA subtitles.

Even if both caps would be the same this wouldn't work though, we
currently don't support SSA/ASS subtitles from external files. See
https://bugzilla.gnome.org/show_bug.cgi?id=625113

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[bcxa sz]

Hi Sebastian,

yes, you are right.

I just saw gstssaparse.c. And in gst_ssa_parse_setcaps(), I found that
GST_ERROR ("Only SSA subtitles embedded in containers are supported");

It means that ssaparse is only used for ssa subtitle embedded in the container.

I think external .ssa or .ass are popular. Let me know if I am wrong.

best regards

BCXA

2011/8/24 Sebastian Dröge <[hidden email]>:

> On Wed, 2011-08-24 at 13:22 +0800, bcxa sz wrote:
>> Hi Developer,
>>
>> Just tried one avi file with .ass subtitle and found that there is no
>> approprate subtitle element picked up by playbin2 because the type
>> found is 'text/x-ssa'.
>>
>> And the caps of ssaparse is 'application/x-ssa' or
>> 'application/x-ass'. So it seemed that the gstreamer had issue to
>> playback .ass/.ssa subtitle.
>
> Hi,
> this happens because there's no real typefinder for SSA subtitles and
> the XDG typefinder uses the "official" mimetype for SSA subtitles.
>
> Even if both caps would be the same this wouldn't work though, we
> currently don't support SSA/ASS subtitles from external files. See
> https://bugzilla.gnome.org/show_bug.cgi?id=625113
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>

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