The dongle creates a V4L2<\/i> device for video and is detected by Pulseaudio<\/i> for audio. As I want to see what I am converting live I need to tee<\/i> both audio and video to the corresponding sinks and the other part would go to to the encoders, muxer and filesink. The command line for that would be:<\/p>\n
As you can see I convert to WebM<\/i> with VP9<\/i> and Vorbis<\/i>. Something interesting can be passing You can see the pipeline, which is beatiful, here:<\/p>\n As you can see, we’re using vaapivp9enc<\/i> here which is hardware enabled and having this pipeline running in my computer was consuming more or less 20% of CPU with the CPU absolutely relaxed, leaving me the necessary computing power for my daily work<\/a>. This would not be possible without GStreamer and GStreamer VAAPI plugins, which is what happens with other solutions whose instructions you can find online.<\/p>\n If for some reason you can’t find vaapivp9enc<\/i> in Debian, you should know there are a couple of packages for the intel drivers and that the one you should install is intel-media-va-driver<\/i>. Thanks go to my colleague at Igalia<\/a> V\u00edctor J\u00e1quez<\/a>, who maintains gstreamer-vaapi<\/a> and helped me solving this problem.<\/p>\n My workflow for this was converting all tapes into WebM<\/i> and then cutting them in the different relevant pieces with PiTiVi<\/a> running GStreamer Editing Services<\/a> both co-maintained by my colleague at Igalia<\/a>, Thibault Saunier<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":" My family had bought many years ago a Panasonic VHS video camera and we had recorded quite a lot of things, holidays, some local shows, etc. I even got paid 5000 pesetas (30\u20ac more than 20 years ago) a couple … Continue reading gst-launch-1.0 matroskamux name=mux ! filesink location=\/tmp\/test.webm \\
\nv4l2src device=\/dev\/video2 norm=255 io-mode=mmap ! queue ! vaapipostproc ! tee name=video_t ! \\
\n queue ! vaapivp9enc rate-control=4 bitrate=1536 ! mux.video_0 \\
\n video_t. ! queue ! xvimagesink \\
\npulsesrc device=alsa_input.usb-MACROSIL_AV_TO_USB2.0-02.analog-stereo ! 'audio\/x-raw,rate=48000,channels=2' ! tee name=audio_t ! \\
\n queue ! pulsesink \\
\n audio_t. ! queue ! vorbisenc ! mux.audio_0<\/code><\/p>\nnorm=255<\/code> to the v4l2src<\/i> element so it’s capturing PAL and the rate-control=4<\/code> for VBR<\/i> to the vaapivp9enc<\/i> element, otherwise it will use cqp<\/i> as default and file size would end up being huge.<\/p>\n![](\"\/xrcalvar\/files\/2019\/10\/pipeline.png\")
<\/a><\/p>\n