rmdemux looses tags...

[Andrea-2]

Hi,

I'm trying to convert RealAudio streams to MP3, using a gst-launch
command line like the following one:

$ gst-launch -t filesrc location=ra/ilgattopardo/ilgattopardo1.ra \
! decodebin2 ! lamemp3enc ! id3v2mux \
! filesink location=ilgattopardo1.mp3

It works perfectly, except for the tags, which I told are found by
rmdemux, but are not passed over to id3v2mux. Actually, look at the
following command line and its output:

$ gst-launch -t filesrc location=ra/ilgattopardo/ilgattopardo1.ra \
! decodebin2 ! fakesink
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
FOUND TAG      : found by element "rmdemux0".
           title: Il Gattopardo  -  1 p.ta
          artist: Terzo Anello  -  Ad alta voce
       copyright: Copyright © 1997 2000 Netia Digital Audio
<more output...>

Title and artist are found, but no way to have them in the MP3 file.

Note that if the source is already an MP3 file, the original tags are
copied over even if the file is resampled or such.

This is quite annoying, since I have tons of such files, and many more I
have to download: many have rather useless names, whilst the tags are
much more useful.

Best regards.

--
Andrea <sarkiaponius'at'alice.it>
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[Tim-Philipp Müller-2]

On Fri, 2011-09-02 at 21:40 +0200, andrea wrote:

Hi,

> I'm trying to convert RealAudio streams to MP3, using a gst-launch
> command line like the following one:
>
> $ gst-launch -t filesrc location=ra/ilgattopardo/ilgattopardo1.ra \
> ! decodebin2 ! lamemp3enc ! id3v2mux \
> ! filesink location=ilgattopardo1.mp3
>
> It works perfectly, except for the tags, which I told are found by
> rmdemux, but are not passed over to id3v2mux. Actually, look at the
> following command line and its output:
>
> $ gst-launch -t filesrc location=ra/ilgattopardo/ilgattopardo1.ra \
> ! decodebin2 ! fakesink
> Setting pipeline to PAUSED ...
> Pipeline is PREROLLING ...
> FOUND TAG      : found by element "rmdemux0".
>            title: Il Gattopardo  -  1 p.ta
>           artist: Terzo Anello  -  Ad alta voce
>        copyright: Copyright © 1997 2000 Netia Digital Audio
> <more output...>
>
> Title and artist are found, but no way to have them in the MP3 file.
>
> Note that if the source is already an MP3 file, the original tags are
> copied over even if the file is resampled or such.
>
> This is quite annoying, since I have tons of such files, and many more I
> have to download: many have rather useless names, whilst the tags are
> much more useful.

File a bug in bugzilla please.

The important thing for transcoding is that the tags also get sent
downstream as a tag *event* (the tag message posted on the bus is only
for the app, not downstream elements). However, the code seems to use
the right API (gst_element_found_tags*()), so this should happen
already. Check with gst-launch -v if the tag event makes it to fakesink.

Cheers
 -Tim


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[Andrea-2]

On Sat, 2011-09-03 at 00:16 +0100, Tim-Philipp Müller wrote:

> On Fri, 2011-09-02 at 21:40 +0200, andrea wrote:
>
> Hi,
>
> > I'm trying to convert RealAudio streams to MP3, using a gst-launch
> > command line like the following one:
> >
> > $ gst-launch -t filesrc location=ra/ilgattopardo/ilgattopardo1.ra \
> > ! decodebin2 ! lamemp3enc ! id3v2mux \
> > ! filesink location=ilgattopardo1.mp3
> >
> > It works perfectly, except for the tags, which I told are found by
> > rmdemux, but are not passed over to id3v2mux. Actually, look at the
> > following command line and its output:
> >
> > $ gst-launch -t filesrc location=ra/ilgattopardo/ilgattopardo1.ra \
> > ! decodebin2 ! fakesink
> > Setting pipeline to PAUSED ...
> > Pipeline is PREROLLING ...
> > FOUND TAG      : found by element "rmdemux0".
> >            title: Il Gattopardo  -  1 p.ta
> >           artist: Terzo Anello  -  Ad alta voce
> >        copyright: Copyright © 1997 2000 Netia Digital Audio
> > <more output...>
> >
> > Title and artist are found, but no way to have them in the MP3 file.
> >
> > Note that if the source is already an MP3 file, the original tags are
> > copied over even if the file is resampled or such.
> >
> > This is quite annoying, since I have tons of such files, and many more I
> > have to download: many have rather useless names, whilst the tags are
> > much more useful.
>
> File a bug in bugzilla please.
>
> The important thing for transcoding is that the tags also get sent
> downstream as a tag *event* (the tag message posted on the bus is only
> for the app, not downstream elements). However, the code seems to use
> the right API (gst_element_found_tags*()), so this should happen
> already. Check with gst-launch -v if the tag event makes it to fakesink.
>

Thanks for your kind answer. Here is the output of the same cmd above,
but with the -v option and a "grep -i event" to filter the incredibly
long output:

/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "event
******* E (type: 102, GstEventNewsegment, update=(boolean)false,
rate=(double)1, applied-rate=(double)1,
format=(GstFormat)GST_FORMAT_TIME, start=(gint64)0, stop=(gint64)-1,
position=(gint64)0;) 0x1c509c0"
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "event
******* E (type: 118, taglist, maximum-bitrate=(uint)20689,
bitrate=(uint)20689, audio-codec=(string)\"Real\\ Audio\\ G2\\ \\(Cook\
\)\";) 0x1c50a00"
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "event
******* E (type: 86, ) 0x1c50a40"

I guess the second event, concerning taglist, could mean that tags reach
the fakesink, but they are just stream info tags, not title or such.

Before I file a bug, could you please tell me what you think about the
above lines?

Best regards.

> Cheers
>  -Tim
>
>
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> gstreamer-devel mailing list
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--
Andrea <sarkiaponius'at'alice.it>
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