Fix crackling audio with pipewire and only add empty audio packets until the first packet arrives

TODO

@@ -10,4 +10,5 @@ Nvidia 515.57 supports nvfbc direct capture with mouse capture. Check if driver
 See https://trac.ffmpeg.org/wiki/EncodingForStreamingSites for optimizing streaming.
 Add -ma option to merge all audio tracks into one (muxing?).
 Look at VK_EXT_external_memory_dma_buf.
-Allow setting a different output resolution than the input resolution.
+Allow setting a different output resolution than the input resolution.
+Use mov+faststart.