diff options
Diffstat (limited to 'docs/design/draft-metadata.txt')
| -rw-r--r-- | docs/design/draft-metadata.txt | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/docs/design/draft-metadata.txt b/docs/design/draft-metadata.txt index 68d28142b3..ffc4df659d 100644 --- a/docs/design/draft-metadata.txt +++ b/docs/design/draft-metadata.txt @@ -6,7 +6,7 @@ additions. Supported Metadata standards ----------------------------- +~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The paragraphs below list supported native metadata standards sorted by type and then in alphabetical order. Some standards have been extended to support @@ -94,7 +94,7 @@ http://wiki.creativecommons.org/Tracker_CC_Indexing Current Metadata handling -------------------------- +~~~~~~~~~~~~~~~~~~~~~~~~~ When reading files, demuxers or parsers extract the metadata. It will be sent as a GST_MESSAGE_TAG to the GstBus and GST_EVENT_TAG to downstream elements. @@ -130,10 +130,11 @@ metadata. Issues ------- +~~~~~~ Unknown/Unmapped metadata -- - - - - - - - - - - - - +^^^^^^^^^^^^^^^^^^^^^^^^^ + Right now GStreamer can lose metadata when transcoding, remuxing content. This can happend as we don't map all metadata fields to generic ones. @@ -159,7 +160,8 @@ We would basically need this for each container format. See also https://bugzilla.gnome.org/show_bug.cgi?id=345352 Lost metadata -- - - - - - - +^^^^^^^^^^^^^ + A case slighly different from the previous is that when an application sets a GstTagList on a pipeline. Right elements consuming tags do not report which tags have been consumed. Especially when using elements that make metadata @@ -181,7 +183,8 @@ of elements and their tags. As a convenience we could flatten the list of tags for the top-level element (if the query was sent to a bin) and add that. Tags are per Element -- - - - - - - - - - +^^^^^^^^^^^^^^^^^^^^ + In many cases we want tags per stream. Even metadata standards like mp4/3gp metadata supports that. Right now GST_MESSAGE_SRC(tags) is the element. We tried changing that to the pad, but that broke applications. @@ -189,7 +192,7 @@ Also we miss the symmetric functionality in GstTagSetter. This interface is usually implemented by elements. Open bugs -- - - - - +^^^^^^^^^ https://bugzilla.gnome.org/buglist.cgi?query_format=advanced;short_desc=tag;bug_status=UNCONFIRMED;bug_status=NEW;bug_status=ASSIGNED;bug_status=REOPENED;bug_status=NEEDINFO;short_desc_type=allwordssubstr;product=GStreamer |