<div dir="ltr">Hi, I am trying to setup a pipeline that will accept mp3 input to convert to raw, using the <code>appsrc</code> source, and the python bindings. In the command line, either of these work fine:<code> </code><pre class="" style=""><code> $ gst-launch-1.0 -v -m filesrc location=test/1-dual-30s.l.mp3 \ ! decodebin ! audioconvert ! audioresample \ ! audio/x-raw,format=S16LE,rate=8000,channels=1 \ ! filesink location=out.raw </code></pre>or <code> </code><pre class="" style=""><code>$ cat test/1-dual-30s.l.mp3 | gst-launch-1.0 -v -m fdsrc fd=0 \ ! decodebin ! audioconvert ! audioresample \ ! audio/x-raw,format=S16LE,rate=8000,channels=1 \ ! filesink location=out.raw </code></pre><pre class="" style=""><code>however, when I try to replicate this with 'appsrc' and the python bindings: -----------------------------</code> <code><code>class DecodeToHTTPStreamPipeline () : def __init__ (self, http_conf, blocksize, loop) : self.HTTPClient = self._InitClient (http_conf, blocksize) self.blocksize = blocksize self.pipeline = gst.Pipeline () self.bus = self.pipeline.get_bus () self.bus.add_signal_watch () self.bus.enable_sync_message_emission () self.bus.connect ('message::eos', self._OnEOS) self.bus.connect ('message::tag', self._OnTag) self.bus.connect ('message::error', self._OnError) self.audiosource = gst.ElementFactory.make ('appsrc', 'appsrc') self.audiosource.set_property ("is-live", True) self.decodebin = gst.ElementFactory.make ('decodebin', 'decodebin') self.decodebin.connect ('pad-added', self._OnNewDecodedPad) self.audioconvert = gst.ElementFactory.make ('audioconvert', 'audioconvert') self.audioresample = gst.ElementFactory.make ('audioresample', 'audioresample') self.capsfilter = gst.ElementFactory.make ('capsfilter', 'audio/x-raw,format=S16LE,rate=8000,channels=1') self.audiosink = gst.ElementFactory.make ('appsink', 'appsink') self.audiosink.set_property ("emit-signals", True) self.audiosink.set_property ('drop', True) self.audiosink.set_property ('sync', False) self.audiosink.connect ('new-sample', self._OnNewBuffer, self.audiosink) if (not (self.pipeline and self.audiosource and self.decodebin and \ self.audioconvert and self.audioresample and self.audiosink)) : print "Error with configuration. Quitting." sys.exit (-1) self.pipeline.add (self.audiosource) self.pipeline.add (self.decodebin) self.pipeline.add (self.audioconvert) self.pipeline.add (self.audioresample) self.pipeline.add (self.capsfilter) self.pipeline.add (self.audiosink) #self.SetOutLocation (outlocation) self.audiosource.link (self.decodebin) self.decodebin.link (self.audioconvert) self.audioconvert.link (self.audioresample) self.audioresample.link (self.capsfilter) self.capsfilter.link (self.audiosink) self.loop = loop self.pipeline.set_state (gst.State.PLAYING) </code>----------------------------- </code></pre><pre class="" style=""><code>I end up with a pipeline that works fine for a range of codecs: .wav, .flac, etc, but it fails with .mp3 files in the sense that </code></pre><pre class="" style=""><code>it does not seem to detect them as .mp3 files, and the output is junk. </code></pre><pre class="" style=""><code>I noted that even on yakkety, gst-inspect lists avdec_mp3 is ranked as 'marginal', is it possible that this is the problem? -------------------- $ gst-inspect-1.0 avdec_mp3 Factory Details: Rank marginal (64) Long-name libav MP3 (MPEG audio layer 3) decoder </code></pre><pre class="" style=""><code></code>---------------------- </pre><pre class="" style="">Is there a work around or reconfiguration for the python bindings that does not involve recompiling everything from source? </pre><pre class="" style="">A different combination of elements for .mp3 would be no problem, but I could not find any that worked (including 'mad' or 'mpg123'). </pre><pre class="" style="">Best regards </pre><pre class="" style=""> -Joe </pre></div>