По мотивам бага https://github.com/danielgtaylor/arista/issues/138 $ gst-launch videotestsrc num-buffers=90 ! x264enc profile=baseline ! mp4mux ! filesink location=test.mp4 produces High-profile mp4, while $ gst-launch videotestsrc num-buffers=90 ! x264enc profile=baseline ! ffmux_mp4 ! filesink location=test.mp4 produces Baseline. У апстрима те же проблемы?
не актуально