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To display an external SRT file over a video with GStreamer, parse it with subparse and connect it to textoverlay’s text pad; connect the decoded video to the overlay’s video pad. The command below follows GStreamer’s documented example. It displays captions during playback—it does not create a permanently captioned output file. YouTube playlist retrieval and advancement are separate steps: the reviewed GStreamer documentation does not establish that a YouTube playlist URL can be used directly.
Burn SRT captions into a GStreamer playback stream
For a local video and matching external .srt file, run this command in a terminal with GStreamer’s command-line tool and the required elements installed:
gst-launch-1.0 textoverlay name=overlay ! videoconvert ! videoscale ! autovideosink
filesrc location=movie.avi ! decodebin3 ! videoconvert ! overlay.video_sink
filesrc location=movie.srt ! subparse ! overlay.text_sinkReplace movie.avi and movie.srt with the paths to your video and subtitle file. The video branch decodes the video and sends it to overlay.video_sink. The subtitle branch reads the SRT file, parses its cues, and sends timestamped text to overlay.text_sink. textoverlay renders the text over the video and matches subtitle and video timestamps to determine when each cue appears. GStreamer describes the element as rendering text on top of a video stream: textoverlay documentation. The full command pattern is in the gst-launch-1.0 documentation.
What you should see
The video should open in an available video sink, with each SRT cue displayed according to its timestamps. Wrapping is enabled by default for textoverlay. Actual file support depends on the codecs, decoders, and sink elements installed on your system; a failure to open a particular format is not necessarily a subtitle-pipeline problem.
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Check the SRT and paths
- Confirm both files exist at the specified paths. If a path contains spaces, quote the property value, for example
filesrc location="my movie.avi". - Check that the SRT is valid and its cue times correspond to the video’s timeline. The overlay uses timestamps, so cues with incorrect timing can be parsed but appear at the wrong moments.
- Use a video format your installed GStreamer plugins can decode. The example uses
decodebin3; the available decoder and sink depend on the local installation.
Why this does not create a permanently captioned file
The example ends in autovideosink, which displays the result. It does not encode or save a new video. In this playback pipeline, “burn in” means the captions are visibly rendered over the picture while it plays, not that the source file has been changed.
To make a durable captioned file, the pipeline needs additional video-encoding, container-muxing, and file-output stages after the overlay. The cited subtitle example does not specify those stages or a suitable codec and container for your needs, so do not treat the playback command as a file-export recipe. GStreamer’s playback tutorials provide broader playback context, but the correct output pipeline depends on the formats and plugins available in your environment.
Use playbin3 when player-managed subtitles are enough
If you do not need to wire the overlay pads yourself, GStreamer documents playbin3 with a media uri and an external subtitle suburi. It is a simpler player-managed option for external subtitles, but it does not show the direct textoverlay graph above or establish a YouTube playlist workflow. See the playbin documentation.
Handle YouTube playlist entries separately
The GStreamer references reviewed document generic URI playback and network playback, but do not document YouTube watch-URL extraction, YouTube playlist resolution, or automatic advancement through a YouTube playlist. Do not assume that putting a playlist URL into a GStreamer uri property will work.
For a playlist-based workflow, treat getting playable media URIs and iterating through entries as an upstream task. Resolve each entry into a URI that GStreamer can read, then pass the entries to the playback or processing pipeline. The resolver, authentication and availability conditions, and present-day compatibility with YouTube are not established by the cited GStreamer material; verify them for your own setup. Once you have a readable media URI, the subtitle-overlay method applies to the video input, provided its timestamps match the SRT.
Troubleshoot common failures
- “No such element” or a missing plugin: The local installation may not include the element named in the graph. Check the installed GStreamer plugins and confirm availability for
textoverlay,subparse,decodebin3, and the selected sink. Availability varies by installation. - The video plays but captions do not appear: Confirm that the subtitle branch uses
filesrc ! subparse ! overlay.text_sink, that the SRT path is correct, and that the cue times overlap the video timeline. - Captions appear at the wrong time: Compare the SRT cue times with the video’s timeline.
textoverlaymatches the timestamps it receives; it cannot correct an SRT file whose timing does not match the video. - The video does not open: Check the filename and whether your GStreamer installation can decode that file’s format. The documented graph’s decoder and playback sink still depend on local plugin availability.
- Characters display incorrectly: For a pipeline using
subtitleoverlay, GStreamer documents asubtitle-encodingproperty. If unset, encoding falls back toGST_SUBTITLE_ENCODING, then ISO-8859-15; this setting belongs tosubtitleoverlay, not the explicittextoverlaygraph above. See the subtitleoverlay documentation. - Network playback pauses: GStreamer’s
playbindocumentation describes buffering-message handling for applications: keep or set the pipeline to PAUSED below 100% buffering, then return it to PLAYING at 100% when playback is desired. This is application-level guidance, not an automatic YouTube-playlist fix.
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