Hi guys!
I have made a working pipeline for playing video with audio. It looks like.
# Video with audio
gst-launch-1.0 filesrc location=speaker.MTS ! decodebin name=demuxer demuxer. ! \
queue ! audioconvert ! audioresample ! autoaudiosink demuxer. ! \
queue ! videoscale ! videoconvert ! videobox ! videomixer ! xvimagesink
The video file is with audio
I have real struggle to parse this to Python.
So far with best effors I get.
(Source: https://brettviren.github.io/pygst-tutorial-org/pygst-tutorial.html)#!/usr/bin/env python
import os
import gi
gi.require_version('Gst', '1.0')
from gi.repository import Gst, GObject, Gtk
class GTK_Main(object):
def __init__(self):
window = Gtk.Window(Gtk.WindowType.TOPLEVEL)
window.set_title("Mpeg2-Player")
window.set_default_size(500, 400)
window.connect("destroy", Gtk.main_quit, "WM destroy")
vbox = Gtk.VBox()
window.add(vbox)
hbox = Gtk.HBox()
vbox.pack_start(hbox, False, False, 0)
self.entry = Gtk.Entry()
hbox.add(self.entry)
self.button = Gtk.Button("Start")
hbox.pack_start(self.button, False, False, 0)
self.button.connect("clicked", self.start_stop)
self.movie_window = Gtk.DrawingArea()
vbox.add(self.movie_window)
window.show_all()
self.player = Gst.Pipeline.new("player")
source = Gst.ElementFactory.make("filesrc", "file-source")
demuxer = Gst.ElementFactory.make("mpegpsdemux", "demuxer")
demuxer.connect("pad-added", self.demuxer_callback)
self.video_decoder = Gst.ElementFactory.make("mpeg2dec", "video-decoder")
self.audio_decoder = Gst.ElementFactory.make("mad", "audio-decoder")
audioconv = Gst.ElementFactory.make("audioconvert", "converter")
audiosink = Gst.ElementFactory.make("autoaudiosink", "audio-output")
videosink = Gst.ElementFactory.make("autovideosink", "video-output")
self.queuea = Gst.ElementFactory.make("queue", "queuea")
self.queuev = Gst.ElementFactory.make("queue", "queuev")
colorspace = Gst.ElementFactory.make("videoconvert", "colorspace")
self.player.add(source)
self.player.add(demuxer)
self.player.add(self.video_decoder)
self.player.add(self.audio_decoder)
self.player.add(audioconv)
self.player.add(audiosink)
self.player.add(videosink)
self.player.add(self.queuea)
self.player.add(self.queuev)
self.player.add(colorspace)
source.link(demuxer)
self.queuev.link(self.video_decoder)
self.video_decoder.link(colorspace)
colorspace.link(videosink)
self.queuea.link(self.audio_decoder)
self.audio_decoder.link(audioconv)
audioconv.link(audiosink)
bus = self.player.get_bus()
bus.add_signal_watch()
bus.enable_sync_message_emission()
bus.connect("message", self.on_message)
bus.connect("sync-message::element", self.on_sync_message)
def start_stop(self, w):
if self.button.get_label() == "Start":
filepath = self.entry.get_text().strip()
if os.path.isfile(filepath):
filepath = os.path.realpath(filepath)
self.button.set_label("Stop")
self.player.get_by_name("file-source").set_property("location", filepath)
self.player.set_state(Gst.State.PLAYING)
else:
self.player.set_state(Gst.State.NULL)
self.button.set_label("Start")
def on_message(self, bus, message):
t = message.type
if t == Gst.MessageType.EOS:
self.player.set_state(Gst.State.NULL)
self.button.set_label("Start")
elif t == Gst.MessageType.ERROR:
err, debug = message.parse_error()
print ("Error: %s" % err, debug)
self.player.set_state(Gst.State.NULL)
self.button.set_label("Start")
def on_sync_message(self, bus, message):
if message.get_structure().get_name() == 'prepare-window-handle':
imagesink = message.src
imagesink.set_property("force-aspect-ratio", True)
xid = self.movie_window.get_property('window').get_xid()
imagesink.set_window_handle(xid)
def demuxer_callback(self, demuxer, pad):
if pad.get_property("template").name_template == "video_%02x":
qv_pad = self.queuev.get_static_pad("sink")
pad.link(qv_pad)
elif pad.get_property("template").name_template == "audio_%02x":
qa_pad = self.queuea.get_static_pad("sink")
pad.link(qa_pad)
Gst.init(None)
GTK_Main()
GObject.threads_init()
Gtk.main()But I have ultimate error, where I can't move further
Error: gst-stream-error-quark: Internal data stream error. (1) gstmpegdemux.c(2945): gst_ps_demux_loop (): /GstPipeline:player/GstMpegPSDemux:demuxer:
streaming stopped, reason not-negotiated (-4)
Does anybody have any idea what I can improve or do you have some other (more update) tutorials?
My further idea is use this for making video streams from Python conferences in Czech Republic, I mean parse to one screen 2 video streams, with sound from one video and some picture next to videos with info.
Thanks a lot
Ormi
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