Re: [PATCH v2 0/1] MR8532: winegstreamer: Force h264parse to output 'au' aligned byte-stream.

[Brendan McGrath (＠redmcg)]

On Mon Aug  4 17:21:31 2025 +0000, Tim Clem wrote:
> No, that doesn't get it working. It looks like there's a caps mismatch
> before we even get around to making the capsfilter:
> ```
> 0:00:00.017267666 17294 0x600003423b40 INFO                    WINE
> wg_transform.c:683:wg_transform_create: transform 0x7fec778130a0 input
> caps video/x-h264, stream-format=(string)byte-stream
> 0:00:00.017561208 17294 0x600003423b40 ERROR                   WINE
> wg_transform.c:522:transform_create_decoder_elements: !!! input_mime=video/x-h264
> 0:00:00.017566333 17294 0x600003423b40 ERROR                   WINE
> wg_transform.c:501:transform_get_parsed_caps: !!! forcing byte-stream
> 0:00:00.023404625 17294 0x600003423b40 WARN                    WINE
> unixlib.c:126:find_element_factories: Failed to find any element factory
> matching type 1x, caps video/x-h264, stream-format=(string)byte-stream,
> alignment=(string)au, parsed=(boolean)true / video/x-raw.
> 0:00:00.023408750 17294 0x600003423b40 ERROR                   WINE
> wg_transform.c:562:transform_create_decoder_elements: !!! couldn't find decoder
> 0:00:00.024156416 17294 0x600003423b40 ERROR                   WINE
> wg_transform.c:785:wg_transform_create: Failed to create winegstreamer transform.
> 1033289.659:0520:0524:warn:quartz:wg_transform_create_mf Failed to
> create transform, status 0xc0000001
> 1033289.659:0520:0524:err:winediag:h264_decoder_create GStreamer doesn't
> support H.264 decoding, please install appropriate plugins
> ```
> transform_create_decoder_elements calls transform_get_parsed_caps early,
> and since this is video/x-h264, it returns caps with byte-stream.
> Shortly thereafter when transform_create_decoder_elements does
> `find_element(GST_ELEMENT_FACTORY_TYPE_DECODER)`, vtdec doesn't pass
> muster because of that.
> Sorry @tclem, of course. I just updated the MR. I've moved the `stream-format` and `alignment` caps out of `transform_get_parsed_caps` and directly to where we create the capsfilter.

-- 
https://gitlab.winehq.org/wine/wine/-/merge_requests/8532#note_112075