The implementation will use some default in this case. The empty string
is not a meaningful device for any existing hardware type, and indeed
OpenCL treats it identically to no device already to work around the lack
of this setting on the command line.
---
fftools/ffmpeg_hw.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/fftools/ffmpeg_hw.c b/fftools/ffmpeg_hw.c
index d454ae7179..962d8f7d5a 100644
--- a/fftools/ffmpeg_hw.c
+++ b/fftools/ffmpeg_hw.c
@@ -155,10 +155,12 @@ int hw_device_init_from_string(const char *arg, HWDevice
**dev_out)
++p;
q = strchr(p, ',');
if (q) {
- device = av_strndup(p, q - p);
- if (!device) {
- err = AVERROR(ENOMEM);
- goto fail;
+ if (q - p > 0) {
+ device = av_strndup(p, q - p);
+ if (!device) {
+ err = AVERROR(ENOMEM);
+ goto fail;
+ }
}
err = av_dict_parse_string(&options, q + 1, "=", ",", 0);
if (err < 0) {
@@ -168,7 +170,8 @@ int hw_device_init_from_string(const char *arg, HWDevice
**dev_out)
}
err = av_hwdevice_ctx_create(&device_ref, type,
- device ? device : p, options, 0);
+ q ? device : p[0] ? p : NULL,
+ options, 0);
if (err < 0)
goto fail;
--
2.20.1
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