不幸的是,后来我尝试用python和treamer进行流媒体编码。在
我找到了一个简单的音频播放器,效果很好:
import gi
gi.require_version('Gst', '1.0')
from gi.repository import GObject, Gst, Gtk
# Initializing threads used by the Gst various elements
GObject.threads_init()
#Initializes the GStreamer library, setting up internal path lists, registering built-in elements, and loading standard plugins.
Gst.init(None)
class Main:
def __init__(self):
self.mainloop = GObject.MainLoop()
#Creating the gst pipeline we're going to add elements to and use to play the file
self.pipeline = Gst.Pipeline()
#creating the filesrc element, and adding it to the pipeline
self.filesrc = Gst.ElementFactory.make("filesrc", "filesrc")
self.filesrc.set_property("location", "beatles.mp3")
self.pipeline.add(self.filesrc)
#creating and adding the decodebin element , an "automagic" element able to configure itself to decode pretty much anything
self.decode = Gst.ElementFactory.make("decodebin", "decode")
self.pipeline.add(self.decode)
#connecting the decoder's "pad-added" event to a handler: the decoder doesn't yet have an output pad (a source), it's created at runtime when the decoders starts receiving some data
self.decode.connect("pad-added", self.decode_src_created)
#setting up (and adding) the alsasin, which is actually going to "play" the sound it receives
self.sink = Gst.ElementFactory.make("alsasink", "sink")
self.pipeline.add(self.sink)
#linking elements one to another (here it's just the filesrc - > decoder link , the decoder -> sink link's going to be set up later)
self.filesrc.link(self.decode)
#handler taking care of linking the decoder's newly created source pad to the sink
def decode_src_created(self, element, pad):
pad.link(self.sink.get_static_pad("sink"))
#running the shit
def run(self):
self.pipeline.set_state(Gst.State.PLAYING)
self.mainloop.run()
start=Main()
start.run()
然后我尝试在中间添加一个speexnc和一个speexdec元素。见6行“#已添加”和1行“#修改”。我知道在这种特殊情况下,通过speex进行编码和解码是没有实际意义的,但是由于python3.x中缺乏这方面的教程和示例,我想在阅读了基本的gstreamer文档和常见问题解答之后开始尝试。虽然没有错误消息,但最终它什么也不播放,而且演讲者也沉默不语:
^{pr2}$任何使其最终生效的建议都将不胜感激! 先谢谢你!在
编辑:GST的输出\u DEBUG=“*:3”
** (GsTest04.py:2500): WARNING **: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files
0:00:00.310035438 2500 0x25b7290 FIXME id3v2 gstid3tag.c:142:gst_tag_from_id3_tag: Cannot map ID3v2 tag 'PRIV' to GStreamer tag
0:00:00.310425594 2500 0x25b7290 FIXME id3v2 gstid3tag.c:142:gst_tag_from_id3_tag: Cannot map ID3v2 tag 'PRIV' to GStreamer tag
0:00:00.310597677 2500 0x25b7290 FIXME id3v2 gstid3tag.c:142:gst_tag_from_id3_tag: Cannot map ID3v2 tag 'PRIV' to GStreamer tag
0:00:00.310753458 2500 0x25b7290 FIXME id3v2 gstid3tag.c:142:gst_tag_from_id3_tag: Cannot map ID3v2 tag 'PRIV' to GStreamer tag
0:00:00.310931687 2500 0x25b7290 FIXME id3v2 gstid3tag.c:142:gst_tag_from_id3_tag: Cannot map ID3v2 tag 'PRIV' to GStreamer tag
0:00:00.311063614 2500 0x25b7290 FIXME id3v2 gstid3tag.c:142:gst_tag_from_id3_tag: Cannot map ID3v2 tag 'PRIV' to GStreamer tag
0:00:00.311322155 2500 0x25b7290 FIXME id3v2 gstid3tag.c:142:gst_tag_from_id3_tag: Cannot map ID3v2 tag 'PRIV' to GStreamer tag
0:00:00.376435699 2500 0x741014f0 WARN alsa conf.c:4544:parse_args: alsalib error: Unknown parameter AES0
0:00:00.376732365 2500 0x741014f0 WARN alsa conf.c:4704:snd_config_expand: alsalib error: Parse arguments error: No such file or directory
0:00:00.376897261 2500 0x741014f0 WARN alsa pcm.c:2217:snd_pcm_open_noupdate: alsalib error: Unknown PCM default:{AES0 0x02 AES1 0x82 AES2 0x00 AES3 0x02}
0:00:00.378137573 2500 0x741014f0 WARN baseparse gstbaseparse.c:3188:gst_base_parse_loop:<mpegaudioparse0> error: streaming stopped, reason not-linked
我看不出有什么明显的错误。我建议使用GST_DEBUG=“*:3”运行程序,以查看日志中是否有任何警告。您可能还需要再次检查所有api调用是否有效。(例如
未导致
None
。我还要检查返回值连接垫()在解码中创建。如果解码器产生的原始音频不是speexec喜欢的,链接将失败。尝试在speexenc之前添加audioconvert元素。在相关问题 更多 >
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