Adding tag information to MP4 encoded video file

rvsw · December 21, 2023, 4:20pm

Hi all,

I am trying to add tag information like to encoded video file contained in MP4 file.

for example adding tags of album & artist fields.

I saw there is a taginject element and I tried to use it to tag the album field:

after running the following:

gst-launch-1.0 -v videotestsrc ! video/x-raw,width=3840,height=2160,framerate=30000/1001 ! vaapipostproc ! video/x-raw,width=1920,height=1080 ! queue ! vaapih264enc ! h264parse ! taginject tags="album=album12345" ! splitmuxsink location=file%003d.mp4 max-size-time=10000000000

I ran the mp4 files created with VLC player but I didnt see anything under the media tab in the VLC.

Am I using the taginject element right?
Can someone add an example of working tagging to an encoded video file in MP$ container?

Thanks

thiou1911 · January 23, 2025, 6:53pm

I’ve got similar issue and had a quick look trough code. What I’ve understand, to succeed with taginject, you must use one of predefined xmp tag:

github.com

GStreamer/gst-plugins-base/blob/master/gst-libs/gst/tag/gstxmptag.c#L951


      
          XmpTag *xmpinfo;
          GstXmpSchema *schema;
          
          __xmp_schemas = g_hash_table_new (g_direct_hash, g_direct_equal);
          
          /* add the maps */
          /* dublic code metadata
           * http://dublincore.org/documents/dces/
           */
          schema = gst_xmp_schema_new ();
          _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_ARTIST,
              "dc:creator", GstXmpTagTypeSeq, NULL, NULL);
          _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_COPYRIGHT,
              "dc:rights", GstXmpTagTypeSimple, NULL, NULL);
          _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_DATE_TIME, "dc:date",
              GstXmpTagTypeSeq, NULL, NULL);
          _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_DESCRIPTION,
              "dc:description", GstXmpTagTypeSimple, NULL, NULL);
          _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_KEYWORDS,
              "dc:subject", GstXmpTagTypeBag, NULL, NULL);
          _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_TITLE, "dc:title",

I’ve also had to set scope=global to tagjnect and faststart=true to muxer (was mp4mux in my case) so header will be at file start