[Cin] webm svt-av1 profile.

[Andrew Randrianasulu]

it _nearly_ works after I recompiled ffmpeg locally.

but end of file sadly black frames?

FFStream::encode_frame: encode failed.
file: /data/data/com.termux/files/home/av1_.webm
  err: Try again
FFMPEG::mux_video  err: Operation not permitted
FFStream::encode_frame: encode failed.
file: /data/data/com.termux/files/home/av1_.webm
  err: Try again
            FFStream::flush failed
:file:/data/data/com.termux/files/home/av1_.webm      err: Operation not
permitted                                                Svt[error]: deinit
called without sending EOS!                  Render::render_single: Session
finished.                          ** rendered 336 frames in 149.076 secs,
2.254 fps
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