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Add alpha channel #592

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subof opened this issue Aug 1, 2024 · 4 comments
Closed

Add alpha channel #592

subof opened this issue Aug 1, 2024 · 4 comments
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feature request New idea for project

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@subof
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subof commented Aug 1, 2024

Add a setting for the alpha channel for VP9, AV1 and STV-AV1, please.
@subof subof added the feature request New idea for project label Aug 1, 2024
@cdgriffith
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AV1 spec does not support transparency to my knowledge (AVIF does but not the video encoders), and a quick look at the encoders in ffmpeg they don't support yuva420p like VP9 does.

I have tried several times to pass through transparency from one webm to another encoded vp9 video without luck.
What would we have to do other than ffmpeg -i in.webm -c:v libvpx-vp9 -pix_fmt yuva420p -b:v 0 -crf:v 31 -quality:v good out.webm to get it working?

@subof
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subof commented Aug 6, 2024

Perhaps it should be a separate layer in the format.webm, not in the codec itself.

@cdgriffith cdgriffith mentioned this issue Aug 9, 2024
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@cdgriffith
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I am adding that format to VP9 options just to have it in case it can work for you or others. Currently in beta https://github.com/cdgriffith/FastFlix/releases/tag/5.8.0b0 if you want to test!

cdgriffith added a commit that referenced this issue Aug 9, 2024
@cdgriffith
Version 5.8.0 (#593)
f3cfc88 
* Adding #283 support for experimental DTS (dca) audio by adding -strict -2 (thanks to Sub7)
* Adding #354 M1 support (thanks to Nhunz and Anton)
* Adding #536 Improve Profiles - save advanced options (thanks to CelticTaonga and DCNerds)
* Adding #568 center app on startup (thanks to Viet-Duc Le)
* Adding #589 support for pydantic 2.x (thanks to dmo marillat)
* Adding #592 Add alpha channel for VP9 (thjanks to subof)
* Fixing #185 audio channels not being set properly and resetting on encoder change (thanks to Tupsi)
* Fixing #522 add file fails - fixed as of 5.7.0 (thanks to pcl5x2008)
* Fixing #531 list limitation in readme that FFmpeg must support the software encoders listed (thanks to brunoais)
* Fixing #567 Profiles for WebP did not work (nor GIF dither) (thanks to jpert)
* Fixing #582 BT.2020-10 Color transfer not maintained (thanks to Ryushin)
* Fixing #585 error when trying to return a video from queue that has the video track after audio or subtitiles (thanks to Hankuu)
* Fixing #586 audio channels being set incorrectly (thanks to Hankuu)
* Fixing #588 audio and subtitle dispositions were not set from source (thanks to GeZorTenPlotZ)
@cdgriffith
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Added in 5.8.0! https://github.com/cdgriffith/FastFlix/releases/tag/5.8.0

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@cdgriffith @subof