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-rw-r--r--doc/bitstream_filters.texi8
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diff --git a/doc/bitstream_filters.texi b/doc/bitstream_filters.texi
index fc2c71fc12..50c95f035d 100644
--- a/doc/bitstream_filters.texi
+++ b/doc/bitstream_filters.texi
@@ -695,6 +695,14 @@ for NTSC frame rate using the @option{frame_rate} option.
ffmpeg -f lavfi -i sine=r=48000:d=1 -c pcm_s16le -bsf pcm_rechunk=r=30000/1001 -f framecrc -
@end example
+@section pgs_frame_merge
+
+Merge a sequence of PGS Subtitle segments ending with an "end of display set"
+segment into a single packet.
+
+This is required by some containers that support PGS subtitles
+(muxer @code{matroska}).
+
@section prores_metadata
Modify color property metadata embedded in prores stream.