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codectimestamper: Update document

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Add more description about those elements

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3021>
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Seungha Yang 2022-09-13 23:20:54 +09:00 committed by GStreamer Marge Bot
parent 7a5846d69d
commit a45273aaeb
2 changed files with 48 additions and 2 deletions
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25
subprojects/gst-plugins-bad/gst/codectimestamper/gsth264timestamper.c
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@ -20,8 +20,31 @@
/**
* SECTION:element-h264timestamper
* @title: h264timestamper
* @short_description: A timestamp correction element for H.264 streams
*
* A timestamp correction element for H.264 stream.
* `h264timestamper` updates the DTS (Decoding Time Stamp) of each frame
* based on H.264 SPS codec setup data, specifically the frame reordering
* information written in the SPS indicating the maximum number of B-frames
* allowed.
*
* In order to determine the DTS of each frame, this element may need to hold
* back a few frames in case the codec data indicates that frame reordering is
* allowed for the given stream. That means this element may introduce additional
* latency for the DTS decision.
*
* This element can be useful if downstream elements require correct DTS
* information but upstream elements either do not provide it at all or the
* upstream DTS information is unreliable.
*
* For example, mp4 muxers typically require both DTS and PTS on the input
* buffers, but in case where the input H.264 data comes from Matroska files or
* RTP/RTSP streams DTS timestamps may be absent and this element may need to
* be used to clean up the DTS timestamps before handing it to the mp4 muxer.
*
* This is particularly the case where the H.264 stream contains B-frames
* (i.e. frame reordering is required), as streams without correct DTS information
* will confuse the muxer element and will result in unexpected (or bogus)
* duration/framerate/timestamp values in the muxed container stream.
*
* ## Example launch line
* ```

25
subprojects/gst-plugins-bad/gst/codectimestamper/gsth265timestamper.c
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@ -20,8 +20,31 @@
/**
* SECTION:element-h265timestamper
* @title: h265timestamper
* @short_description: A timestamp correction element for H.265 streams
*
* A timestamp correction element for H.265 stream.
* `h265timestamper` updates the DTS (Decoding Time Stamp) of each frame
* based on H.265 SPS codec setup data, specifically the frame reordering
* information written in the SPS indicating the maximum number of B-frames
* allowed.
*
* In order to determine the DTS of each frame, this element may need to hold
* back a few frames in case the codec data indicates that frame reordering is
* allowed for the given stream. That means this element may introduce additional
* latency for the DTS decision.
*
* This element can be useful if downstream elements require correct DTS
* information but upstream elements either do not provide it at all or the
* upstream DTS information is unreliable.
*
* For example, mp4 muxers typically require both DTS and PTS on the input
* buffers, but in case where the input H.265 data comes from Matroska files or
* RTP/RTSP streams DTS timestamps may be absent and this element may need to
* be used to clean up the DTS timestamps before handing it to the mp4 muxer.
*
* This is particularly the case where the H.265 stream contains B-frames
* (i.e. frame reordering is required), as streams without correct DTS information
* will confuse the muxer element and will result in unexpected (or bogus)
* duration/framerate/timestamp values in the muxed container stream.
*
* ## Example launch line
* ```