ttmlparse

Parses timed text subtitle files described using Timed Text Markup Language (TTML). Currently, only the EBU-TT-D profile of TTML, designed for distribution of subtitles over IP, is supported.

The parser outputs a GstBuffer for each scene in the input TTML file, a scene being a period of time during which a static set of subtitles should be visible. The parser places each text element within a scene into its own GstMemory within the scene's buffer, and attaches metadata to the buffer describing the styling and layout associated with all the contained text elements. A downstream renderer element uses this information to correctly render the text on top of video frames.

Example launch lines

 gst-launch-1.0 filesrc location=<media file location> ! video/quicktime ! qtdemux name=q ttmlrender name=r q. ! queue ! h264parse ! avdec_h264 ! autovideoconvert ! r.video_sink filesrc location=<subtitle file location> blocksize=16777216 ! queue ! ttmlparse ! r.text_sink r. ! ximagesink q. ! queue ! aacparse ! avdec_aac ! audioconvert ! alsasink

Parse and render TTML subtitles contained in a single XML file over an MP4 stream containing H.264 video and AAC audio.

Hierarchy

GObject
    ╰──GInitiallyUnowned
        ╰──GstObject
            ╰──GstElement
                ╰──ttmlparse

Factory details

Authors: – GStreamer maintainers , Chris Bass

Classification: – Codec/Decoder/Subtitle

Rank – none

Plugin – ttmlsubs

Package – GStreamer Bad Plug-ins

Pad Templates

`sink`

application/ttml+xml:

Presence – always

Direction – sink

Object type – GstPad

`src`

text/x-raw(meta:GstSubtitleMeta):

Presence – always

Direction – src

Object type – GstPad

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