<div dir="ltr"><div><div><div><div><div><div>Hi. </div>I'm generating an AV stream on one machine and trying to play the stream on another machine namely a Raspberry PI. However sometimes GStreamer can't find the H.264 decoder. Is this a well known problem? Pipelines and results are shown further down in this email. </div>It appears that the higher the bandwidth or the higher the video resolution, the more often the decoder is not found subsequently the stream is not played. If I use 320x240 @1000kbps, the stream is played more than half the time the stream is started. If I increase bandwidth and geometry, the fail rate grow. At 640x480 @2000kbps it almost never works. When it doesn't play, the pipeline reports 'Missing element: H.264 decoder'. The Raspberry pi has the latest Raspian installed and the GStreamer elements are installed following the information on this page: <a href="http://wiki.matthiasbock.net/index.php/Hardware-accelerated_video_playback_on_the_Raspberry_P">http://wiki.matthiasbock.net/index.php/Hardware-accelerated_video_playback_on_the_Raspberry_P</a>i </div> This is the pipeline used to generate the stream: #!/bin/sh AUDIO='audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)16, depth=(int)16, rate=(int)44100, channels=(int)2' VIDEO='video/x-raw-yuv, width=(int)320, height=(int)180, framerate=(fraction)25/1, pixel-aspect-ratio=(fraction)1/1' audioencoder='faac bitrate=128000 profile=LC outputformat=0' videoencoder='x264enc tune=zerolatency bitrate=4000 profile=baseline' ENCAUDIO='audio/mpeg,mpegversion=4, stream-format=raw' ENCVIDEO='video/x-h264, alignment=au, stream-format=byte-stream' gst-launch-0.10 -v \ audiotestsrc is-live=true !\ queue !\ $AUDIO !\ audioconvert !\ $audioencoder !\ $ENCAUDIO !\ queue !\ muxer. videotestsrc is-live=true !\ $VIDEO !\ queue !\ $videoencoder !\ $ENCVIDEO !\ h264parse !\ queue !\ mpegtsmux name=muxer !\ mpegtsparse !\ queue !\ tcpserversink host=0.0.0.0 port=5012 sync-method=2 </div>This is the pipeline used to play the stream on the Rasp-pi gst-launch-1.0 -v --gst-debug=decodebin:4 \ tcpclientsrc host=81.7.134.69 port=5012 !\ queue max-size-buffers=0 !\ decodebin name=decoder max-size-bytes=0 !\ queue max-size-bytes=000000 !\ videoconvert !\ autovideosink decoder. !\ queue max-size-bytes=000000 !\ audioconvert ! alsasink </div>This is part of the output, when the stream is NOT playing (please note the missing element statement): Setting pipeline to PAUSED ... Pipeline is PREROLLING ... /GstPipeline:pipeline0/GstDecodeBin:decoder/GstTypeFindElement:typefind.GstPad:src: caps = video/mpegts, systemstream=(boolean)true, packetsize=(int)188 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstTSDemux:tsdemux0.GstPad:sink: caps = video/mpegts, systemstream=(boolean)true, packetsize=(int)188 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0.GstPad:src_0: caps = audio/mpeg, mpegversion=(int)2, stream-format=(string)adts /GstPipeline:pipeline0/GstDecodeBin:decoder/GstAacParse:aacparse0.GstPad:sink: caps = audio/mpeg, mpegversion=(int)2, stream-format=(string)adts /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0.GstPad:sink_0: caps = audio/mpeg, mpegversion=(int)2, stream-format=(string)adts /GstPipeline:pipeline0/GstDecodeBin:decoder/GstAacParse:aacparse0.GstPad:src: caps = audio/mpeg, framed=(boolean)true, mpegversion=(int)4, rate=(int)44100, channels=(int)2, stream-format=(string)adts /GstPipeline:pipeline0/GstDecodeBin:decoder/GstFaad:faad0.GstPad:sink: caps = audio/mpeg, framed=(boolean)true, mpegversion=(int)4, rate=(int)44100, channels=(int)2, stream-format=(string)adts /GstPipeline:pipeline0/GstDecodeBin:decoder/GstFaad:faad0.GstPad:src: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)44100, channels=(int)2, channel-mask=(bitmask)0x0000000000000003 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0: max-size-buffers = 5 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0: max-size-time = 0 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0: max-size-bytes = 2097152 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0.GstPad:src_1: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)nal /GstPipeline:pipeline0/GstDecodeBin:decoder/GstH264Parse:h264parse0.GstPad:sink: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)nal /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0.GstPad:sink_1: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)nal /GstPipeline:pipeline0/GstDecodeBin:decoder/GstH264Parse:h264parse0.GstPad:src: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, parsed=(boolean)true Missing element: H.264 decoder /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0: max-size-buffers = 5 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0: max-size-time = 0 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0: max-size-bytes = 2097152 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0: max-size-buffers = 5 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0: max-size-time = 0 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0: max-size-bytes = 2097152 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstCapsFilter:capsfilter0.GstPad:src: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, parsed=(boolean)true /GstPipeline:pipeline0/GstDecodeBin:decoder/GstCapsFilter:capsfilter0.GstPad:sink: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, parsed=(boolean)true /GstPipeline:pipeline0/GstDecodeBin:decoder/GstCapsFilter:capsfilter0.GstPad:src: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, parsed=(boolean)true /GstPipeline:pipeline0/GstQueue:queue2.GstPad:src: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)44100, channels=(int)2, channel-mask=(bitmask)0x0000000000000003 /GstPipeline:pipeline0/GstQueue:queue2.GstPad:sink: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)44100, channels=(int)2, channel-mask=(bitmask)0x0000000000000003 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstFaad:faad0.GstPad:src: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)44100, channels=(int)2, channel-mask=(bitmask)0x0000000000000003 ......... </div>This is part of the output when playing Setting pipeline to PAUSED ... Pipeline is PREROLLING ... /GstPipeline:pipeline0/GstDecodeBin:decoder/GstTypeFindElement:typefind.GstPad:src: caps = video/mpegts, systemstream=(boolean)true, packetsize=(int)188 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstTSDemux:tsdemux0.GstPad:sink: caps = video/mpegts, systemstream=(boolean)true, packetsize=(int)188 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0.GstPad:src_0: caps = audio/mpeg, mpegversion=(int)2, stream-format=(string)adts /GstPipeline:pipeline0/GstDecodeBin:decoder/GstAacParse:aacparse0.GstPad:sink: caps = audio/mpeg, mpegversion=(int)2, stream-format=(string)adts /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0.GstPad:sink_0: caps = audio/mpeg, mpegversion=(int)2, stream-format=(string)adts /GstPipeline:pipeline0/GstDecodeBin:decoder/GstAacParse:aacparse0.GstPad:src: caps = audio/mpeg, framed=(boolean)true, mpegversion=(int)4, rate=(int)44100, channels=(int)2, stream-format=(string)adts /GstPipeline:pipeline0/GstDecodeBin:decoder/GstFaad:faad0.GstPad:sink: caps = audio/mpeg, framed=(boolean)true, mpegversion=(int)4, rate=(int)44100, channels=(int)2, stream-format=(string)adts /GstPipeline:pipeline0/GstDecodeBin:decoder/GstFaad:faad0.GstPad:src: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)44100, channels=(int)2, channel-mask=(bitmask)0x0000000000000003 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0: max-size-buffers = 5 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0: max-size-time = 0 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0: max-size-bytes = 2097152 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0.GstPad:src_1: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)nal /GstPipeline:pipeline0/GstDecodeBin:decoder/GstH264Parse:h264parse0.GstPad:sink: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)nal /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0.GstPad:sink_1: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)nal /GstPipeline:pipeline0/GstDecodeBin:decoder/GstH264Parse:h264parse0.GstPad:src: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, width=(int)320, height=(int)180, framerate=(fraction)25/1, parsed=(boolean)true, pixel-aspect-ratio=(fraction)1/1 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstCapsFilter:capsfilter0.GstPad:src: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, width=(int)320, height=(int)180, framerate=(fraction)25/1, parsed=(boolean)true, pixel-aspect-ratio=(fraction)1/1 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstOMXH264Dec-omxh264dec:omxh264dec-omxh264dec0.GstPad:sink: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, width=(int)320, height=(int)180, framerate=(fraction)25/1, parsed=(boolean)true, pixel-aspect-ratio=(fraction)1/1 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstCapsFilter:capsfilter0.GstPad:sink: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, width=(int)320, height=(int)180, framerate=(fraction)25/1, parsed=(boolean)true, pixel-aspect-ratio=(fraction)1/1 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstCapsFilter:capsfilter0.GstPad:src: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, width=(int)320, height=(int)180, framerate=(fraction)25/1, parsed=(boolean)true, pixel-aspect-ratio=(fraction)1/1 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstOMXH264Dec-omxh264dec:omxh264dec-omxh264dec0.GstPad:sink: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, width=(int)320, height=(int)180, framerate=(fraction)25/1, parsed=(boolean)true, pixel-aspect-ratio=(fraction)1/1 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstOMXH264Dec-omxh264dec:omxh264dec-omxh264dec0.GstPad:src: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0: max-size-buffers = 5 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0: max-size-time = 0 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstMultiQueue:multiqueue0: max-size-bytes = 2097152 /GstPipeline:pipeline0/GstDecodeBin:decoder.GstDecodePad:src_0: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstDecodeBin:decoder.GstDecodePad:src_0: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstDecodeBin:decoder.GstDecodePad:src_1: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)44100, channels=(int)2, channel-mask=(bitmask)0x0000000000000003 /GstPipeline:pipeline0/GstQueue:queue1.GstPad:src: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstQueue:queue1.GstPad:sink: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstDecodeBin:decoder.GstDecodePad:src_0.GstProxyPad:proxypad10: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstQueue:queue2.GstPad:sink: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)44100, channels=(int)2, channel-mask=(bitmask)0x0000000000000003 /GstPipeline:pipeline0/GstDecodeBin:decoder.GstDecodePad:src_1.GstProxyPad:proxypad7: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)44100, channels=(int)2, channel-mask=(bitmask)0x0000000000000003 /GstPipeline:pipeline0/GstAudioConvert:audioconvert0.GstPad:src: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)44100, channels=(int)2, channel-mask=(bitmask)0x0000000000000003 /GstPipeline:pipeline0/GstAlsaSink:alsasink0.GstPad:sink: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)44100, channels=(int)2, channel-mask=(bitmask)0x0000000000000003 /GstPipeline:pipeline0/GstAudioConvert:audioconvert0.GstPad:sink: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)44100, channels=(int)2, channel-mask=(bitmask)0x0000000000000003 /GstPipeline:pipeline0/GstVideoConvert:videoconvert0.GstPad:src: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstAutoVideoSink:autovideosink0.GstGhostPad:sink.GstProxyPad:proxypad1: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstAutoVideoSink:autovideosink0/GstEglGlesSink:autovideosink0-actual-sink-eglgles.GstPad:sink: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstAutoVideoSink:autovideosink0.GstGhostPad:sink: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstVideoConvert:videoconvert0.GstPad:sink: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstOMXH264Dec-omxh264dec:omxh264dec-omxh264dec0.GstPad:src: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstDecodeBin:decoder.GstDecodePad:src_0: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstQueue:queue1.GstPad:src: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstQueue:queue1.GstPad:sink: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstDecodeBin:decoder.GstDecodePad:src_0.GstProxyPad:proxypad10: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstVideoConvert:videoconvert0.GstPad:src: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstAutoVideoSink:autovideosink0.GstGhostPad:sink.GstProxyPad:proxypad1: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstAutoVideoSink:autovideosink0/GstEglGlesSink:autovideosink0-actual-sink-eglgles.GstPad:sink: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstAutoVideoSink:autovideosink0.GstGhostPad:sink: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstVideoConvert:videoconvert0.GstPad:sink: caps = video/x-raw, format=(string)I420, width=(int)320, height=(int)180, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)bt601, framerate=(fraction)25/1 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstCapsFilter:capsfilter0.GstPad:src: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, width=(int)320, height=(int)180, framerate=(fraction)25/1, parsed=(boolean)true, pixel-aspect-ratio=(fraction)1/1 /GstPipeline:pipeline0/GstDecodeBin:decoder/GstOMXH264Dec-omxh264dec:omxh264dec-omxh264dec0.GstPad:sink: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, width=(int)320, height=(int)180, framerate=(fraction)25/1, parsed=(boolean)true, pixel-aspect-ratio=(fraction)1/1 Pipeline is PREROLLED ... Setting pipeline to PLAYING ... /GstPipeline:pipeline0/GstQueue:queue2.GstPad:src: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)44100, channels=(int)2, channel-mask=(bitmask)0x0000000000000003 New clock: GstAudioSinkClock /GstPipeline:pipeline0/GstAudioConvert:audioconvert0.GstPad:src: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)44100, channels=(int)2, channel-mask=(bitmask)0x0000000000000003 /GstPipeline:pipeline0/GstAlsaSink:alsasink0.GstPad:sink: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)44100, channels=(int)2, channel-mask=(bitmask)0x0000000000000003 /GstPipeline:pipeline0/GstAudioConvert:audioconvert0.GstPad:sink: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)44100, channels=(int)2, channel-mask=(bitmask)0x0000000000000003 </div>