NetBSD Problem Report #48399
From www@NetBSD.org Sat Nov 23 04:26:54 2013
Return-Path: <www@NetBSD.org>
Received: from mail.netbsd.org (mail.netbsd.org [149.20.53.66])
(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
(Client CN "mail.NetBSD.org", Issuer "Postmaster NetBSD.org" (verified OK))
by mollari.NetBSD.org (Postfix) with ESMTPS id 6B075A628D
for <gnats-bugs@gnats.NetBSD.org>; Sat, 23 Nov 2013 04:26:54 +0000 (UTC)
Message-Id: <20131123042652.9EE6CA6291@mollari.NetBSD.org>
Date: Sat, 23 Nov 2013 04:26:52 +0000 (UTC)
From: nathanialsloss@yahoo.com.au
Reply-To: nathanialsloss@yahoo.com.au
To: gnats-bugs@NetBSD.org
Subject: multimedia/ffmpeg cannot capture video from /dev/video*
X-Send-Pr-Version: www-1.0
>Number: 48399
>Category: pkg
>Synopsis: multimedia/ffmpeg cannot capture video from /dev/video*
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: pkg-manager
>State: closed
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Sat Nov 23 04:30:00 +0000 2013
>Closed-Date: Sat Jan 16 13:47:22 +0000 2021
>Last-Modified: Sat Jan 16 13:47:22 +0000 2021
>Originator: Nat Sloss
>Release: pkgsrc-2013Q2
>Organization:
>Environment:
NetBSD beast 6.1.1_PATCH NetBSD 6.1.1_PATCH (PCIPAE) #22: Thu Nov 21 23:13:25 EST 2013 build@microrusty:/usr/src/sys/arch/i386/compile/obj/PCIPAE i386
>Description:
Ffmpeg cannot capture video from webcam as ioctl G_PARM is unsupported also if the webcam supplies an empty frame the encoding exits.
>How-To-Repeat:
Try the following:
ffmpeg -f v4l2 -s 640x480 -r 25 -i /dev/video0 test.avi
You will find that is exits with an error instead of capturing video.
>Fix:
Apply this patch:
$NetBSD$
--- libavdevice/v4l2.c.orig 2013-05-10 00:16:06.000000000 +0000
+++ libavdevice/v4l2.c
@@ -585,6 +585,13 @@ static int mmap_read_frame(AVFormatConte
/* FIXME: Some special treatment might be needed in case of loss of signal... */
while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
+
+ if (buf.bytesused == 0) {
+ if (buf.m.userptr)
+ enqueue_buffer(s->fd, buf.index);
+ return AVERROR(EAGAIN);
+ }
+
if (res < 0) {
if (errno == EAGAIN)
return AVERROR(EAGAIN);
@@ -771,6 +778,7 @@ static int v4l2_set_parameters(AVFormatC
tpf = &streamparm.parm.capture.timeperframe;
}
+#ifndef __NetBSD__
streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) < 0) {
ret = AVERROR(errno);
@@ -806,6 +814,7 @@ static int v4l2_set_parameters(AVFormatC
"The driver does not allow to change time per frame\n");
}
}
+#endif
s1->streams[0]->avg_frame_rate.num = tpf->denominator;
s1->streams[0]->avg_frame_rate.den = tpf->numerator;
s1->streams[0]->r_frame_rate = s1->streams[0]->avg_frame_rate;
Regards,
Nat.
>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->closed
State-Changed-By: nia@NetBSD.org
State-Changed-When: Sat, 16 Jan 2021 13:47:22 +0000
State-Changed-Why:
appears fixed in the modern versions of ffmpeg available in pkgsrc today,
at least in netbsd-current (and likely 9 with usb2)
>Unformatted:
(Contact us)
$NetBSD: query-full-pr,v 1.46 2020/01/03 16:35:01 leot Exp $
$NetBSD: gnats_config.sh,v 1.9 2014/08/02 14:16:04 spz Exp $
Copyright © 1994-2020
The NetBSD Foundation, Inc. ALL RIGHTS RESERVED.