From nobody Sat Apr 30 19:23:40 2022 X-Original-To: multimedia@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 173D41ABC329 for ; Sat, 30 Apr 2022 19:23:50 +0000 (UTC) (envelope-from mason@blisses.org) Received: from yangtze.blisses.org (yangtze.blisses.org [144.202.50.44]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4KrK5x19gZz3q8W for ; Sat, 30 Apr 2022 19:23:49 +0000 (UTC) (envelope-from mason@blisses.org) Received: from contoocook.blisses.org (contoocook.blisses.org [68.238.57.52]) by yangtze.blisses.org (Postfix) with ESMTP id 33CD7177131 for ; Sat, 30 Apr 2022 15:23:42 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=blisses.org; s=default; t=1651346621; bh=WxwTLcwJvi20R7HmjzPTo5+k4kZ5bF3b/4ZeT45hDn4=; h=Date:From:To:Subject:From; b=Y/b+Rq7rOFbPWkI5qH8gUw8Oc3tzQui/20EWTHS2l/01W1b5bPekHoL+dKX5OblSW gietCJKXnoxCF2UKIKYxBNqnYFr4eYFJUWCxQooXBnzSP2T7MdJB91bta1rtbmkUmd knQAbt25LvfuNu3P5kIdDrFKRLWvHcU1u8sgsAvb2Wa0FwLmCsskC1ols0yrzGGUlk 7bvxlqoiACnmVQnzKZQjDNArtRrcOm6SYwS/njxOtVBYkDNrqvUBVn3X3JZfXsig3k 3CrQEEwYlQW4pJSaamHwVyqDufTDQzdxQOYpApEQav95K6cQcZPmscJrwni44Q7eOX 2BJdRTR7t3q9A== Date: Sat, 30 Apr 2022 15:23:40 -0400 From: Mason Loring Bliss To: multimedia@freebsd.org Subject: How to do audio with ffmpeg/v4l2/oss? Message-ID: List-Id: Multimedia discussions List-Archive: https://lists.freebsd.org/archives/freebsd-multimedia List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-multimedia@freebsd.org MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="E8hkDDHykvTS8Qor" Content-Disposition: inline X-Rspamd-Queue-Id: 4KrK5x19gZz3q8W X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=blisses.org header.s=default header.b="Y/b+Rq7r"; dmarc=pass (policy=quarantine) header.from=blisses.org; spf=pass (mx1.freebsd.org: domain of mason@blisses.org designates 144.202.50.44 as permitted sender) smtp.mailfrom=mason@blisses.org X-Spamd-Result: default: False [-3.87 / 15.00]; RCVD_TLS_LAST(0.00)[]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[blisses.org:s=default]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; R_SPF_ALLOW(-0.20)[+mx]; MIME_GOOD(-0.20)[multipart/signed,text/plain]; TO_DN_NONE(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[multimedia@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_SPAM_SHORT(0.23)[0.231]; DKIM_TRACE(0.00)[blisses.org:+]; DMARC_POLICY_ALLOW(-0.50)[blisses.org,quarantine]; MLMMJ_DEST(0.00)[multimedia]; SIGNED_PGP(-2.00)[]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:~]; SUBJECT_ENDS_QUESTION(1.00)[]; ASN(0.00)[asn:20473, ipnet:144.202.48.0/20, country:US]; RCVD_COUNT_TWO(0.00)[2]; MID_RHS_MATCH_FROM(0.00)[] X-ThisMailContainsUnwantedMimeParts: N --E8hkDDHykvTS8Qor Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi all! I do this on Debian to present a video with audio over Jitsi: ffmpeg -re -ss 00:00:00 -i foo.mp4 \ -map 0:0 -f v4l2 -c:v rawvideo /dev/video100 \ -map 0:1 -f alsa hw:aloop100,1 & I'd like to do the equivalent on FreeBSD, and on my first pass I got video working, but not audio. I see the oss filter built into ffmpeg, but I'm not sure how to point it to a device or what that device might then be. It's been a while since I tried and this might not be the right video syntax, but I'm mostly curious about what the right thing to do is for the audio: ffmpeg -re -ss 00:00:00 -i foo.mp4 \ -map 0:0 -f v4l2 -c:v rawvideo /dev/video100 \ -map 0:1 -f oss [INSERT MAGIC HERE] Note that I'm not tied to the idea of using ffmpeg for this - it's just what works on GNU/Linux, and it seems to at least mostly work here. I'd be grateful for advice. --=20 Mason Loring Bliss mason@blisses.org Ewige Blumenkraft! awake ? sleep : random() & 2 ? dream : sleep; -- Hamlet, Act III, Scene I --E8hkDDHykvTS8Qor Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEEXtBZz1axB5rEDCEnrJXcHbvJVUFAmJtjLoACgkQnrJXcHbv JVWn6g//YFNkejkpO5oekGLJhnd6L1XUsVqHuessm/3MrcD5u5kKhaik93PmjdtJ zQYlGCbiINpUYf589vh9wIvIIyUSkWMrpEtdG48oE3/Akx+0lDuveb0nJGj8hlVc nwAgyK1RQRgYIU13ZVu6+xIUL1bcJyZMPqQr/VKaPJJ2KViNA94p/lrChgAVeHqX QiU85//Imkz4UTU/wx17LiUymFx7TrSN8Ri/sXoqXSFIT1limPwHSHYgLe63YYFi loUev4fQPlTL1E+qiujXR0yRLB1kYs9BUNHkmYbXPOP3t81+yprDA57+PsYdmfDl UWyPYwTYGYD888ppF1bhHrxpADuDfzjFHZ/6tJKWa2GHIRf9hbsL20yY11Pe1zKp sXADOtr12Dk2A6wpuEcRaIVJy0hirK1AJaXshpyWtNlSK7AQ7Febd/kH2l1ygWmK CyqdK37EsTTqxHsivNXH9L/GI/JgcM5UZq/iT0IrRyXgPMAb5ua7dzVAD5HvAwgt ZaO97SE8e9S4uwm468cdwEbYwYfL17KPl84ZCt5/P4SM2UBpe1sdoatjdoYB2zoY dDEtnj2unvCzLbUxqXRdRGkKnGuqJlRqw8sDuH6rcbBIJfi0CVDf2V6tGkM3FNfp uYMr0S8SkascluS+D0s/KzWfDozaa52CB81X8uZqm7LlWfgvscc= =Z1jB -----END PGP SIGNATURE----- --E8hkDDHykvTS8Qor--