~jmaibaum/gst-ltcsrc - Linear/Longitudinal Time Code Source for GStreamer using x42's libltc

d2df52a5 — Johannes Maibaum 2 years ago

README: Update instructions for Debian 11

a50a8acb — Johannes Maibaum 2 years ago

Add GUI test app

f1fb7232 — Johannes Maibaum 3 years ago

README: Document Fedora dev-dependencies

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#gst-ltcsrc

CAUTION: This is still pre-alpha code.

A gstreamer source element creating LTC timecode based on libltc by Robin Gareus (x42).

#Dependencies

gstreamer development headers
libltc >= 1.3.1 (will be built as a meson subproject, if not found)
meson >=0.55
ninja (needed by meson)

#Fedora 34

sudo dnf install \
    meson \
    gstreamer1-plugins-base-devel \
    libltc-devel

#Debian 11

sudo apt install \
    meson \
    libgstreamer-plugins-base1.0-dev \
    libltc-dev

#Building

meson build && ninja -C build

If you want to force building libltc as a subproject, you can tell meson to do so:

meson build --force-fallback-for=ltc && ninja -C build

#Manual Tests

Use --gst-plugin-path to specify the path to the compiled, but still uninstalled plugin.

#Play LTC timecode to a video file, mute original audio

gst-launch-1.0 --gst-plugin-path=./build/src \
    filesrc location=/path/to/video-file.mp4 ! decodebin name=dec \
        dec. ! queue ! videoconvert ! autovideosink \
        dec. ! queue ! audioconvert ! audiomixer name=mix sink_0::mute=true ! autoaudiosink \
            ltcsrc volume=0.2 userbits=291 ! mix.

#Play LTC timecode to a video file, TC on the left, original audio panned to the right channel

To swap channels, change signs of the two panorama= parameters.

gst-launch-1.0 --gst-plugin-path=./build/src \
    filesrc location=/path/to/video-file.mp4 ! decodebin name=dec \
        dec. ! queue ! videoconvert ! autovideosink \
        dec. ! queue ! audioconvert ! audiopanorama panorama=1.0 ! audiomixer name=mix ! autoaudiosink \
            ltcsrc volume=0.2 userbits=291 ! audioconvert ! audiopanorama panorama=-1.0 ! mix.