[QUESTION] Installing gst-plugin-closedcaption & invalid datetime '1970-01-01'

I have tried to install gst-plugins-rs following instructions from README.md on macOS, with an aim to use the gst-plugin-closedcaption plugin with gst-launch-1.0. My use case is just for command-line file conversion.

• gst-plugin-scanner recognizes that libgstrsclosedcaption exists.
• gst-plugin-scanner displays a warning about invalid datetime)
• gst-inspect-1.0 is not recognizing any of the plugins within gst-plugin-closedcaption.

Here is the install workflow...

Installing rust etc.

$ brew install rust
$ cargo --version
cargo 1.57.0
$ cargo install cargo-c

$ echo $(rustc --version --verbose | sed -n 's/^host:[[:space:]]*//p')
x86_64-apple-darwin

Running cinstall from the cargo repository...

$ locate gst-plugin-closedcaption
$ cat $HOME/.cargo/registry/src/github.com-1ecc6299db9ec823/gst-plugin-closedcaption-0.7.2/Cargo.toml | grep -e "name = " | head -n1
name = "gst-plugin-closedcaption"

$ cd ~/.cargo/registry/src/github.com-1ecc6299db9ec823/gst-plugin-closedcaption-0.7.2
$ cargo cinstall -p gst-plugin-closedcaption --prefix=/usr/local
   Compiling gst-plugin-closedcaption v0.7.2 (/Users/REDACTED/.cargo/registry/src/github.com-1ecc6299db9ec823/gst-plugin-closedcaption-0.7.2)
    Finished release [optimized] target(s) in 39.32s
    Building pkg-config files
  Installing pkg-config file
  Installing static library
  Installing shared library

Install appears to be successful, but the new plugins do not seem to be available to gst-inspect-1.0.

$ file /usr/local/lib/gstreamer-1.0/libgstrsclosedcaption.dylib
/usr/local/lib/gstreamer-1.0/libgstrsclosedcaption.dylib: Mach-O 64-bit dynamically linked shared library x86_64

$ gst-inspect-1.0 | grep -ie subtitle -ie caption -ie 608 -ie 708

(gst-plugin-scanner:90027): GStreamer-WARNING **: 11:41:46.335: GstPluginDesc for '/usr/local/lib/gstreamer-1.0/libgstrsclosedcaption.dylib' has invalid datetime '1970-01-01'
avi:  avisubtitle: Avi subtitle parser
dvbsuboverlay:  dvbsuboverlay: DVB Subtitles Overlay
typefindfunctions: subtitle/x-kate: no extensions
typefindfunctions: application/x-subtitle-vtt: vtt
inter:  intersubsrc: Internal subtitle source
inter:  intersubsink: Internal subtitle sink
dvdsub:  dvdsubdec: DVD subtitle decoder
dvdsub:  dvdsubparse: DVD subtitle parser
ttmlsubs:  ttmlparse: TTML subtitle parser
ttmlsubs:  ttmlrender: TTML subtitle renderer
subparse:  subparse: Subtitle parser
subparse:  ssaparse: SSA Subtitle Parser
dvbsubenc:  dvbsubenc: DVB subtitle encoder
closedcaption:  cccombiner: Closed Caption Combiner
closedcaption:  ccconverter: Closed Caption Converter
closedcaption:  ccextractor: Closed Caption Extractor
closedcaption:  line21decoder: Line 21 CC Decoder
closedcaption:  cc708overlay: Closed Caption overlay
closedcaption:  line21encoder: Line 21 CC Encoder
playback:  subtitleoverlay: Subtitle Overlay

Since I am using cinstall and installing to /usr/local and gst-plugin-scanner is already generating an warning, I believe cinstall has placed /usr/local/lib/gstreamer-1.0/libgstrsclosedcaption.dylib in the default place, avoiding the need for ${GST_PLUGIN_PATH} environment variable at runtime.

I assume that gst-inspect-1.0 should list the plugins within gst-plugin-closedcaption, such as:

ccdetect
cea608overlay
cea608tojson
cea608tott
jsontovtt
mcc_enc
mcc_parse
scc_enc
scc_parse
transcriberbin
tttocea608
tttojson

Although it is only a WARNING rather than ERROR, would the following message prevent the plugins from working with gst-inspect-1.0 and gst-launch-1.0?

(gst-plugin-scanner:90027): GStreamer-WARNING **: 11:41:46.335: GstPluginDesc for '/usr/local/lib/gstreamer-1.0/libgstrsclosedcaption.dylib' has invalid datetime '1970-01-01'

Thanks. The new rust caption plugins look really interesting, and I appreciate that a lot of work has gone into developing them.