A question about the decodebin logic for downstream caps

[William Manley]

On 01/11/12 15:05, dv wrote:
> This, on the other hand, doesn't work:
> gst-launch-1.0 filesrc location=/path/to/song.mp3  ! decodebin !
> "audio/x-raw, format=(string)F32LE" ! fakesink
>
> Looking at the gst-launch -v output, it turns out that the decodebin
> srcpad uses S16LE as the format. The reason is this: mpg123audiodec
> looks at its peer pad, which in the decodebin case, is a ghost pad with
> caps set to "ANY". It then sees if S16LE is allowed by downstream. Since
> downstream essentially says that any format is OK, S16LE is chosen.
>
> An audioconvert element is necessary:
>
> gst-launch-1.0 filesrc location=/path/to/song.mp3  ! decodebin !
> audioconvert ! "audio/x-raw, format=(string)F32LE" ! fakesink
>
> But that defeats the whole purpose of multiple formats in the
> mpg123audiodec srccaps!
>
> Any ideas on how to solve this?

Try:

     gst-launch-1.0 filesrc location=/path/to/song.mp3 \
       ! decodebin caps="audio/x-raw, format=(string)F32LE" \
       ! fakesink

Thanks

Will
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