Pipeline generates empty ogg video

[Noe Nieto-2]

I wrote a script in python to generate a OGG video from a set of PNG files.

======================= >8 =======================

#!/usr/bin/env python3
import os
import argparse

import gi; gi.require_version('Gst', '1.0')
from gi.repository import GObject, Gst


def pipeline(png_path, ogg_path):
    """
    Builds the pipeline
    png_path is a directory path to the images, like '/home/fulano/images/'
    ogg_path is the file path for the video, including the name, like '/home/fulano/video.ogg'
    """
    pipeline = Gst.Pipeline.new("pipeline")

    multifilesrc = Gst.ElementFactory.make('multifilesrc')
    multifilesrc.set_properties(
        location=os.path.join(png_path,'%03d.png'),
        index=0,
        caps=Gst.Caps.from_string("image/png,framerate=(fraction)12/1")
    )
    pipeline.add(multifilesrc)

    pngdec = Gst.ElementFactory.make('pngdec')
    pipeline.add(pngdec)
    multifilesrc.link(pngdec)

    videoconvert = Gst.ElementFactory.make('videoconvert', None)
    pipeline.add(videoconvert)
    pngdec.link(videoconvert)

    videorate = Gst.ElementFactory.make('videorate', None)
    pipeline.add(videorate)
    videoconvert.link(videorate)

    theoraenc = Gst.ElementFactory.make('theoraenc', None)
    pipeline.add(theoraenc)
    videorate.link(theoraenc)

    oggmux = Gst.ElementFactory.make('oggmux', None)
    pipeline.add(oggmux)
    theoraenc.link(oggmux)

    filesink = Gst.ElementFactory.make('filesink', None)
    filesink.set_property('location', ogg_path)
    pipeline.add(filesink)
    oggmux.link(filesink)

    return pipeline

if __name__=="__main__":
    Gst.init(None)
    pipe = pipeline('img', 'video.ogg')
    pipe.set_state(Gst.State.PLAYING)
    GObject.MainLoop()

======================= >8 =======================

When running the script I get the following information:

$ GST_DEBUG=3 ./ogg_tool
0:00:00.037269747 11891 0x55adbcd1ec00 FIXME                default gstutils.c:3902:gst_pad_create_stream_id_internal:<multifilesrc0:src> Creating random stream-id, consider implementing a deterministic way of creating a stream-id
0:00:00.037337706 11891 0x55adbcd1ec00 FIXME           videodecoder gstvideodecoder.c:928:gst_video_decoder_drain_out:<pngdec0> Sub-class should implement drain()
0:00:00.039960129 11891 0x55adbcd1ec00 WARN            videodecoder gstvideodecoder.c:2438:gst_video_decoder_chain:<pngdec0> Received buffer without a new-segment. Assuming timestamps start from 0.
0:00:00.040000881 11891 0x55adbcd1ec00 FIXME           videodecoder gstvideodecoder.c:928:gst_video_decoder_drain_out:<pngdec0> Sub-class should implement drain()
0:00:00.047336315 11891 0x55adbcd1ec00 WARN               videopool gstvideopool.c:219:video_buffer_pool_set_config:<videobufferpool1> no caps in config

$ ll
total 12
drwxrwxr-x. 2 nnieto nnieto 4096 nov 30 15:00 img
-rwxrwxr-x. 1 nnieto nnieto 1959 nov 30 15:50 ogg_tool
-rw-rw-r--. 1 nnieto nnieto    0 nov 30 15:55 video.ogg

video.ogg is 0 bytes long

I tried with gst-launch and it works:

$ gst-launch-1.0 multifilesrc location="img/%03d.png" index=0 caps="image/png,framerate=\(fraction\)12/1" ! pngdec ! videoconvert ! videorate ! theoraenc ! oggmux ! filesink location="video_gstlaunch.ogg"
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
Got EOS from element "pipeline0".
Execution ended after 0:00:01.932992495
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...

$ ll
total 444
drwxrwxr-x. 2 nnieto nnieto   4096 nov 30 15:00 img
-rwxrwxr-x. 1 nnieto nnieto   1959 nov 30 15:50 ogg_tool
-rw-rw-r--. 1 nnieto nnieto 438882 nov 30 15:57 video_gstlaunch.ogg
-rw-rw-r--. 1 nnieto nnieto      0 nov 30 15:55 video.ogg

Any idea what I'm doing wrong?

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