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Support for transparent video #180

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woniu163 opened this issue Mar 14, 2022 · 5 comments
Open

Support for transparent video #180

woniu163 opened this issue Mar 14, 2022 · 5 comments

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@woniu163
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support for transparent video by libvpx, like webm
@izzytwosheds
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Technically we should already support this. VPx support is available on many devices via MediaCodec API which LiTr uses. The trick is to figure out correct MediaMuxerMediaTarget and MediaCodecDecoder parameters. I will try to take a quick look at this.

@izzytwosheds
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Can you describe your use case? Are you trying to transcode a WEBM with transparent video into MP4 with some effects? Or are you trying to create a WEBM with transparency?

@woniu163
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Yes, we tried to combine a webm and a mp4 video into a new mp4 file, but it didn't work

@izzytwosheds
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Did you try to draw webm frames onto mp4 frames? And alpha channel didn't work, I presume?

@woniu163
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yes，the alpha channel didn't work

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@izzytwosheds @woniu163