GV-HUVC/4Kの後継機GV-HUVC/4KVの発売もあってか
GV-HUVC/4Kが値崩れしていたので買ってみました。
いつものごとくffmpegを使用して動作確認をしてみます。
・接続デバイスの確認について
「 ffmpeg -list_devices true -f dshow -i dummy 」を実行
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[dshow @ -] "I-O DATA GV-HUVC 4K, Video Capture USB"
[dshow @ -] "デジタル オーディオ インターフェイス (I-O DATA GV-HUVC 4K, Audio Capture USB)"
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・ビデオデバイスの入力仕様
※GV-HUVC/4Kは入力ソース毎に固定出力を行うようで以下のようになりました。
（手持ちの機器で出力できる解像度のみテスト）
「 ffmpeg -list_options true -f dshow -i video="I-O DATA GV-HUVC 4K, Video Capture USB" 」を実行
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【480pの入力】
[dshow @ -] pixel_format=yuyv422 min s=720x480 fps=59.9402 max s=720x480 fps=59.9402
[dshow @ -] pixel_format=yuyv422 min s=720x480 fps=59.9402 max s=720x480 fps=59.9402
[dshow @ -] pixel_format=yuyv422 min s=720x480 fps=59.9402 max s=720x480 fps=59.9402
[dshow @ -] pixel_format=yuyv422 min s=720x480 fps=59.9402 max s=720x480 fps=59.9402
[dshow @ -] pixel_format=yuyv422 min s=720x480 fps=59.9402 max s=720x480 fps=59.9402
[dshow @ -] pixel_format=yuyv422 min s=720x480 fps=59.9402 max s=720x480 fps=59.9402
【720pの入力】
[dshow @ -] pixel_format=yuyv422 min s=1280x720 fps=59.9402 max s=1280x720 fps=59.9402
[dshow @ -] pixel_format=yuyv422 min s=1280x720 fps=59.9402 max s=1280x720 fps=59.9402
[dshow @ -] pixel_format=nv12 min s=1280x720 fps=59.9402 max s=1280x720 fps=59.9402
[dshow @ -] pixel_format=nv12 min s=1280x720 fps=59.9402 max s=1280x720 fps=59.9402
[dshow @ -] pixel_format=yuv420p min s=1280x720 fps=59.9402 max s=1280x720 fps=59.9402
[dshow @ -] pixel_format=yuv420p min s=1280x720 fps=59.9402 max s=1280x720 fps=59.9402
【1080iの入力】（仕様の通りインターレスは強制プログレッシブ化されているようです。）
[dshow @ -] pixel_format=yuyv422 min s=1920x1080 fps=29.97 max s=1920x1080 fps=29.97
[dshow @ -] pixel_format=yuyv422 min s=1920x1080 fps=29.97 max s=1920x1080 fps=29.97
[dshow @ -] pixel_format=yuyv422 min s=1920x1080 fps=29.97 max s=1920x1080 fps=29.97
[dshow @ -] pixel_format=yuyv422 min s=1920x1080 fps=29.97 max s=1920x1080 fps=29.97
[dshow @ -] pixel_format=yuyv422 min s=1920x1080 fps=29.97 max s=1920x1080 fps=29.97
[dshow @ -] pixel_format=yuyv422 min s=1920x1080 fps=29.97 max s=1920x1080 fps=29.97
【1080p】
[dshow @ -] pixel_format=yuyv422 min s=1920x1080 fps=59.9402 max s=1920x1080 fps=59.9402
[dshow @ -] pixel_format=yuyv422 min s=1920x1080 fps=59.9402 max s=1920x1080 fps=59.9402
[dshow @ -] pixel_format=nv12 min s=1920x1080 fps=59.9402 max s=1920x1080 fps=59.9402
[dshow @ -] pixel_format=nv12 min s=1920x1080 fps=59.9402 max s=1920x1080 fps=59.9402
[dshow @ -] pixel_format=yuv420p min s=1920x1080 fps=59.9402 max s=1920x1080 fps=59.9402
[dshow @ -] pixel_format=yuv420p min s=1920x1080 fps=59.9402 max s=1920x1080 fps=59.9402
【1080 24p】
[dshow @ -] pixel_format=yuyv422 min s=1920x1080 fps=23.98 max s=1920x1080 fps=23.98
[dshow @ -] pixel_format=yuyv422 min s=1920x1080 fps=23.98 max s=1920x1080 fps=23.98
[dshow @ -] pixel_format=nv12 min s=1920x1080 fps=23.98 max s=1920x1080 fps=23.98
[dshow @ -] pixel_format=nv12 min s=1920x1080 fps=23.98 max s=1920x1080 fps=23.98
[dshow @ -] pixel_format=yuv420p min s=1920x1080 fps=23.98 max s=1920x1080 fps=23.98
[dshow @ -] pixel_format=yuv420p min s=1920x1080 fps=23.98 max s=1920x1080 fps=23.98
【4K 24p】
[dshow @ -] pixel_format=nv12 min s=3840x2160 fps=23.98 max s=3840x2160 fps=23.98
[dshow @ -] pixel_format=nv12 min s=3840x2160 fps=23.98 max s=3840x2160 fps=23.98
[dshow @ -] pixel_format=nv12 min s=3840x2160 fps=23.98 max s=3840x2160 fps=23.98
[dshow @ -] pixel_format=nv12 min s=3840x2160 fps=23.98 max s=3840x2160 fps=23.98
[dshow @ -] pixel_format=yuv420p min s=3840x2160 fps=23.98 max s=3840x2160 fps=23.98
[dshow @ -] pixel_format=yuv420p min s=3840x2160 fps=23.98 max s=3840x2160 fps=23.98
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・オーディオデバイスの入力仕様
「 ffmpeg -list_options true -f dshow -i audio="デジタル オーディオ インターフェイス (I-O DATA GV-HUVC 4K, Audio Capture USB)" 」を実行
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[dshow @ -] min ch=1 bits=8 rate= 11025 max ch=2 bits=16 rate= 44100
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通常のGV-HUVCと比べて出力時の解像度やフレームレートの自由度が無く、固定となっています。
後継機のGV-HUVC/4KVでは出力する解像度とフレームレートを調整するソフト
「StreamChanger(Windowsのみ)」が使用可能になっているようで改善されているようです。
現在は7千円台で購入できるので、4K(30pまで)に対応したい・入力ソース毎の固定出力でも構わないなら買いかも？
ただ、GV-HUVCの方が出力自由度が高いですし、USB(C to A , C to C)の延長ケーブルも入ってるので使いやすいかもしれないですね。
以上。