avdevice/dshow is a realtime device and as such does not support seeking.
Therefore, its demuxer format should define the AVFMT_NOBINSEARCH,
AVFMT_NOGENSEARCH and AVFMT_NO_BYTE_SEEK flags.
With these flags set, attempting to seek (with e.g. avformat_seek_file())
correctly yields -1 (operation not permitted) instead of -22 (invalid argument).
This actually seems to apply to many other devices, at least the gdigrab, v4l2,
vfwcap, x11grab, fbdev, kmsgrab and android_camera devices, from reading the
source.
Signed-off-by: Diederick Niehorster <dcni...@gmail.com>
---
libavdevice/dshow.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavdevice/dshow.c b/libavdevice/dshow.c
index 8d0a6fcc09..135367d7de 100644
--- a/libavdevice/dshow.c
+++ b/libavdevice/dshow.c
@@ -1335,6 +1335,6 @@ const AVInputFormat ff_dshow_demuxer = {
.read_header = dshow_read_header,
.read_packet = dshow_read_packet,
.read_close = dshow_read_close,
- .flags = AVFMT_NOFILE,
+ .flags = AVFMT_NOFILE,// | AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH
| AVFMT_NO_BYTE_SEEK,
.priv_class = &dshow_class,
};
--
2.28.0.windows.1
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