[Bug 778750] For vaapih264enc without h264parse, using the adaptive 8x8 DCT encoding tool breaks 720p 30 fps clips

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=778750

--- Comment #7 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 348152
  --> https://bugzilla.gnome.org/attachment.cgi?id=348152&action=edit
libs: utils: h26x: implements gst_vaapi_utils_h26x_write_nal_unit

Implements gst_vaapi_utils_h26x_write_nal_unit, which does
write nal unit's length and data to bitwriter.

Note that this applies EPB(Emulation Prevention Bytes).
Otherwise produced codec_data might be broken when decoder/parser
considering EPB, starts parsing.

See also Annex B of H264, which describes EPB.

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