I am trying to record audio into adpcm format using gst-launch and ffenc_g726 encoder. <div style="font-family: arial;">I have tried following:</div> <div style="font-family: arial; font-size: 10pt;"> </div> <div><pre class="bz_comment_text" style="white-space: pre-wrap; width: 50em; color: rgb(51, 51, 51); background-color: rgb(255, 255, 255);">gst-launch autoaudiosrc ! ffenc_g726 bitrate=16000 ! filesink location="recg726.wav" File (recg726.wav) recorded fine (size >0bytes). But when I tried to Playback; gst-launch filesrc location=recg726.wav ! ffdec_g726 ! alsasink </pre><pre class="bz_comment_text" style="white-space: pre-wrap; width: 50em; color: rgb(51, 51, 51); background-color: rgb(255, 255, 255);">I am getting following error:</pre><pre class="bz_comment_text" style="white-space: pre-wrap; width: 50em; color: rgb(51, 51, 51); background-color: rgb(255, 255, 255);">Setting pipeline to PAUSED ... Pipeline is PREROLLING ... ERROR: from element /GstPipeline:pipeline0/ffdec_g726:ffdec_g7260: Internal GStreamer error: negotiation problem. Please file a bug at <a href="http://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer" style="font-family: arial; color: rgb(102, 51, 102);">http://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer</a>. Additional debug info: gstffmpegdec.c(2804): gst_ffmpegdec_chain (): /GstPipeline:pipeline0/ffdec_g726:ffdec_g7260: ffdec_g726: input format was not set before data start ERROR: pipeline doesn't want to preroll. Setting pipeline to NULL ... Freeing pipeline ... For Playback, I also tried following and see that the error is about type of the stream not found into the recorded file. Is anyone can help me here?</pre><pre class="bz_comment_text" style="white-space: pre-wrap; width: 50em; color: rgb(51, 51, 51); background-color: rgb(255, 255, 255);">gst-launch playbin uri=file:///home/root/recg726.wav </pre><pre class="bz_comment_text" style="white-space: pre-wrap; width: 50em; color: rgb(51, 51, 51); background-color: rgb(255, 255, 255);">Setting pipeline to PAUSED ... ERROR: Pipeline doesn't want to pause. ERROR: from element /GstPlayBin:playbin0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind: Could not determine type of stream. Additional debug info: gsttypefindelement.c(996): gst_type_find_element_activate (): /GstPlayBin:playbin0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind Setting pipeline to NULL ... Freeing pipeline ...</pre></div>