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New imagesequencesrc element

Submitted by César Fabián Orccón Chipana

Assigned to Tim Müller @tpm

Link to original bug (#731890)

Description

Created attachment 278728
It is an example of how to use GstImageSequenceSrc

Hello guys. I've written an element in gst-plugins-bad which I called as GstImageSequenceSrc. It works very similar to GstMultiFileSrc, but there are some differences.

Differences with GstMultiFileSrc.

  • Handles a list of filenames instead of a printf pattern as GstMultiFileSrc does.

    • Having a list of filenames is useful because you can set the filenames you want,
      in the order you want. For example, you can add more filenames or sort the list.
    • There are two ways to create this list:
      a) Setting a location propertie. This value could look like:
      1) "/some/folder/with/images/ or ."
      2) "/a/path/img.jpg,/other/path/img2.jpg" or "img1.png,img2.png"
      3) "/a/path/.JPEG" or ".png"
      b) Setting the filename-list (GList) directly.

  • Creates an "imagesequence://" protocol which allows the playbin to play this element. It handles a 'fake' uri but it is useful finally.
    gst-launch-1.0 playbin uri="imagesequencesrc:///some/path/*.jpg?framerate=20/1&loop=1"

  • It "detects" the mimetype of the images. You only have to worry about the framerate.

  • It calculates the duration.

Things to improve:

  • Seeking: it seeks to the wrong image sometimes (actually, after many seeks).
  • The way duration is calculated.

PD: stormer was telling me to support png and jpeg files (both at the same time) but I don't see a usecase.

You can see the most-stable version of this element in
https://github.com/cfoch/gst-plugins-bad/tree/sequences/gst/sequences

Develop:
https://github.com/cfoch/gst-plugins-bad/tree/sequences-develop/gst/sequences

Attachment 278728, "It is an example of how to use GstImageSequenceSrc":
test.c