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ffmpeg_hw: make hardware selection for filters more user friendly

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When a device is derived from a source device, there are at least 2
devices, and usually the derived device is the expected device, so let's
pick the last device if user doesn't specify the filter device with
filter_hw_device option

After applying this patch, the command below can work:

$> ffmpeg -init_hw_device vaapi=va:/dev/dri/renderD128 -init_hw_device
qsv=hw@va -f lavfi -i yuvtestsrc  -vf
format=nv12,hwupload=extra_hw_frames=64 -c:v h264_qsv -y out.h264

Reviewed-by: Soft Works <softworkz@hotmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
Haihao Xiang 2021-06-29 09:45:38 +08:00 committed by James Almer
parent cd4e6e404b
commit 6803d8b440
1 changed files with 13 additions and 7 deletions
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20
fftools/ffmpeg_hw.c
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@ -553,15 +553,21 @@ int hw_device_setup_for_filter(FilterGraph *fg)
HWDevice *dev;
int i;
// If the user has supplied exactly one hardware device then just
// give it straight to every filter for convenience. If more than
// one device is available then the user needs to pick one explcitly
// with the filter_hw_device option.
// Pick the last hardware device if the user doesn't pick the device for
// filters explicitly with the filter_hw_device option.
if (filter_hw_device)
dev = filter_hw_device;
else if (nb_hw_devices == 1)
dev = hw_devices[0];
else
else if (nb_hw_devices > 0) {
dev = hw_devices[nb_hw_devices - 1];
if (nb_hw_devices > 1)
av_log(NULL, AV_LOG_WARNING, "There are %d hardware devices. device "
"%s of type %s is picked for filters by default. Set hardware "
"device explicitly with the filter_hw_device option if device "
"%s is not usable for filters.\n",
nb_hw_devices, dev->name,
av_hwdevice_get_type_name(dev->type), dev->name);
} else
dev = NULL;
if (dev) {