This fixes writing of the seek table header. gst_audio_encoder_get_audio_info() will still return old/unset audio info until set_format() has actually returned, which then results in query_total_samples() to always return 0. Thanks to Jacob Kauffmann for debugging this and finding the main cause. Fixes https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/issues/756 Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/661>