Queries the peer pad of a given sink pad to convert src_val in src_format to dest_format.
| this |
a Pad, on whose peer pad to invoke the convert query on. Must be a sink pad. |
| src_format |
a Format to convert from. |
| src_val |
a value to convert. |
| dest_format |
the Format to convert to. |
| dest_val |
a pointer to the result. |
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