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lavd/x11grab: add an option to disable MIT-SHM. 

With remote displays supporting the MIT-SHM extension,
the extension is detected and used, but attaching fails
asynchronously.
This commit is contained in:
Nicolas George 2014-07-15 11:37:47 +02:00
parent 16c6795465
commit 1d12df1ad7
2 changed files with 8 additions and 1 deletions
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4
doc/indevs.texi
View File

@ -895,6 +895,10 @@ ffmpeg -f x11grab -follow_mouse centered -show_region 1 -framerate 25 -video_siz
@item video_size
Set the video frame size. Default value is @code{vga}.
@item use_shm
Use the MIT-SHM extension for shared memory. Default value is @code{1}.
It may be necessary to disable it for remote displays.
@end table
@c man end INPUT DEVICES

5
libavdevice/x11grab.c
View File

@ -166,7 +166,7 @@ x11grab_read_header(AVFormatContext *s1)
int x_off = 0;
int y_off = 0;
int screen;
int use_shm;
int use_shm = 0;
char *dpyname, *offset;
int ret = 0;
Colormap color_map;
@ -223,8 +223,10 @@ x11grab_read_header(AVFormatContext *s1)
av_log(s1, AV_LOG_INFO, "followmouse is enabled, resetting grabbing region to x: %d y: %d\n", x_off, y_off);
}
if (x11grab->use_shm) {
use_shm = XShmQueryExtension(dpy);
av_log(s1, AV_LOG_INFO, "shared memory extension%s found\n", use_shm ? "" : " not");
}
if(use_shm) {
int scr = XDefaultScreen(dpy);
@ -641,6 +643,7 @@ static const AVOption options[] = {
{ "framerate", "set video frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "ntsc"}, 0, 0, DEC },
{ "show_region", "show the grabbing region", OFFSET(show_region), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC },
{ "video_size", "set video frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = "vga"}, 0, 0, DEC },
{ "use_shm", "use MIT-SHM extension", OFFSET(use_shm), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, DEC },
{ NULL },
};