# Recording problem with SVT Client

**URL:** <https://casparcgforum.org/t/recording-problem-with-svt-client/5387>\
**Category:** FAQ\
**Created:** [January 26, 2023, 7:00am UTC](https://casparcgforum.org/t/recording-problem-with-svt-client/5387 "2023-01-26T07:00:15Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![markusnygard](https://casparcgforum.org/user_avatar/casparcgforum.org/markusnygard/32/8_2.png) [@markusnygard](https://casparcgforum.org/u/markusnygard)\
**Post date:** [January 26, 2023, 7:00am UTC](https://casparcgforum.org/t/recording-problem-with-svt-client/5387/1 "2023-01-26T07:00:15Z")

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Hi  
Im trying to record with the SVT client a MXF with alpha using the default codec “dnxhd” and preset  
“-codec:v dnxhd -b:v 120M -flags:v +ilme+ildct -threads:v 4 -filter:v format=yuv422p,interlace” and tick the alpha-box  
My Davinci Resolve doesnt seem to understand that there is any alpha, and I think it is right. At least Mediainfo doesnt say anything about alpha  
Any suggestions?

br markus

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**Author:** ![didikunz](https://casparcgforum.org/user_avatar/casparcgforum.org/didikunz/32/7_2.png) [@didikunz](https://casparcgforum.org/u/didikunz)\
**Post date:** [January 26, 2023, 9:35am UTC](https://casparcgforum.org/t/recording-problem-with-svt-client/5387/2 "2023-01-26T09:35:51Z")

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I am not sure, but I think that `format=yuv422p` does make it to not have an alpha channel. And by the way: Have you checked if there is a second file with an `_A` appended to the filename?

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**Author:** ![markusnygard](https://casparcgforum.org/user_avatar/casparcgforum.org/markusnygard/32/8_2.png) [@markusnygard](https://casparcgforum.org/u/markusnygard)\
**Post date:** [January 26, 2023, 9:38am UTC](https://casparcgforum.org/t/recording-problem-with-svt-client/5387/3 "2023-01-26T09:38:41Z")

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No alpha-file.  
Should I try format=yuv=444p ?

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**Author:** ![didikunz](https://casparcgforum.org/user_avatar/casparcgforum.org/didikunz/32/7_2.png) [@didikunz](https://casparcgforum.org/u/didikunz)\
**Post date:** [January 26, 2023, 9:40am UTC](https://casparcgforum.org/t/recording-problem-with-svt-client/5387/4 "2023-01-26T09:40:30Z")

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Is there something like `yuv4224p` or `yuv4444p`? Maybe not…

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<div class="post-metadata">

**Author:** ![markusnygard](https://casparcgforum.org/user_avatar/casparcgforum.org/markusnygard/32/8_2.png) [@markusnygard](https://casparcgforum.org/u/markusnygard)\
**Post date:** [January 26, 2023, 9:42am UTC](https://casparcgforum.org/t/recording-problem-with-svt-client/5387/5 "2023-01-26T09:42:41Z")

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> [@didikunz](#):
>
> `yuv4224p`

at least yuv444p didnt work

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<div class="post-metadata">

**Author:** ![didikunz](https://casparcgforum.org/user_avatar/casparcgforum.org/didikunz/32/7_2.png) [@didikunz](https://casparcgforum.org/u/didikunz)\
**Post date:** [January 26, 2023, 9:43am UTC](https://casparcgforum.org/t/recording-problem-with-svt-client/5387/6 "2023-01-26T09:43:49Z")

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Maybe a google search about FFMPEG command line arguments may help.

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<div class="post-metadata">

**Author:** ![markusnygard](https://casparcgforum.org/user_avatar/casparcgforum.org/markusnygard/32/8_2.png) [@markusnygard](https://casparcgforum.org/u/markusnygard)\
**Post date:** [January 26, 2023, 9:47am UTC](https://casparcgforum.org/t/recording-problem-with-svt-client/5387/7 "2023-01-26T09:47:23Z")

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trying that right now. I think one problem could be that the file is 8-bit