Hi,
video(1) fails to read files that were previously recorded with -o
somefile, unless -g (to select read(2) as the input method) is also
specified:
$ video -o foo
^C
$ video -i foo
video: ioctl VIDIOC_REQBUFS: Bad file descriptor
$ video -g -i foo
[ plays the file ]
mmap-mode doesn't work here because it uses a few v4l2-specific ioctls
to talk to the video device.
The patch below fixes that by always using read(2) when the -i option is
used.
--
Gregor
Index: video.1
===================================================================
RCS file: /mnt/media/cvs/xenocara/app/video/video.1,v
retrieving revision 1.13
diff -u -p -r1.13 video.1
--- video.1 4 Jun 2016 07:44:32 -0000 1.13
+++ video.1 14 Sep 2016 19:47:52 -0000
@@ -113,6 +113,10 @@ If
is
.Ql - ,
frames will be read from standard input.
+This will use
+.Xr read 2
+to grab frames instead of
+.Xr mmap 2 .
.It Fl O Ar output
File to which frames will be written.
If
Index: video.c
===================================================================
RCS file: /mnt/media/cvs/xenocara/app/video/video.c,v
retrieving revision 1.19
diff -u -p -r1.19 video.c
--- video.c 6 Jun 2016 19:31:22 -0000 1.19
+++ video.c 14 Sep 2016 19:46:39 -0000
@@ -1805,6 +1805,7 @@ main(int argc, char *argv[])
err++;
} else {
vid.mode = (vid.mode & ~M_IN_DEV) | M_IN_FILE;
+ vid.mmap_on = 0; /* mmap mode does not work for
files */
snprintf(vid.iofile, sizeof(vid.iofile),
optarg);
}
