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

[Tim Clem (＠tclem)]

On Mon Aug  4 06:05:13 2025 +0000, Brendan McGrath wrote:
> FYI - I haven't had a chance to investigate this issue further yet, but
> I did come up with a work-around which I think will address your issue
> and the original one:
> https://gitlab.winehq.org/redmcg/wine/-/merge_requests/8
> Let me know if this works for you.
> 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.

-- 
https://gitlab.winehq.org/wine/wine/-/merge_requests/8532#note_112050