<div dir="ltr"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
> I use the `av_sdp_create()` to generate my SDP file but I<br>
> think somethings is wrong.<br>
<br>
Did you test if it works with ffmpeg (the application)?<br><br></blockquote><div><br></div><div>I did the following: </div><div><br></div><div><div>+>ffmpeg -re -f lavfi -i aevalsrc="sin(400*2*PI*t)" -c:a libvorbis -ac 2 -f rtp rtp://<a href="http://127.0.0.1:8554">127.0.0.1:8554</a></div><div>ffmpeg version N-78598-g98a0053 Copyright (c) 2000-2016 the FFmpeg developers</div><div> built with gcc 5.3.0 (GCC)</div><div> configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib</div><div> libavutil 55. 18.100 / 55. 18.100</div><div> libavcodec 57. 24.103 / 57. 24.103</div><div> libavformat 57. 25.101 / 57. 25.101</div><div> libavdevice 57. 0.101 / 57. 0.101</div><div> libavfilter 6. 34.100 / 6. 34.100</div><div> libswscale 4. 0.100 / 4. 0.100</div><div> libswresample 2. 0.101 / 2. 0.101</div><div> libpostproc 54. 0.100 / 54. 0.100</div><div>Input #0, lavfi, from 'aevalsrc=sin(400*2*PI*t)':</div><div> Duration: N/A, start: 0.000000, bitrate: 2822 kb/s</div><div> Stream #0:0: Audio: pcm_f64le, 44100 Hz, mono, dbl, 2822 kb/s</div><div>Output #0, rtp, to 'rtp://<a href="http://127.0.0.1:8554">127.0.0.1:8554</a>':</div><div> Metadata:</div><div> encoder : Lavf57.25.101</div><div> Stream #0:0: Audio: vorbis (libvorbis), 44100 Hz, stereo, fltp</div><div> Metadata:</div><div> encoder : Lavc57.24.103 libvorbis</div><div>Stream mapping:</div><div> Stream #0:0 -> #0:0 (pcm_f64le (native) -> vorbis (libvorbis))</div><div>SDP:</div><div>v=0</div><div>o=- 0 0 IN IP4 127.0.0.1</div><div>s=No Name</div><div>c=IN IP4 127.0.0.1</div><div>t=0 0</div><div>a=tool:libavformat 57.25.101</div><div>m=audio 8554 RTP/AVP 97</div><div>a=rtpmap:97 vorbis/44100/2</div><div>a=fmtp:97 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can then read it with no problems using </div><div>+> ffplay -i test.sdp -protocol_whitelist file,udp,rtp<br></div><div><br></div><div>I realised that the text dump is much larger than the buffer I prepared so I have increased the buffer size.. Now my application generates exactly the same blob of text, but the payload id changes from 97 to 96.<span style="line-height:1.5"> </span></div><div><span style="line-height:1.5"><br></span></div><div><span style="line-height:1.5">I replaced the SDP contents accordingly, but ffplay seems to wait indefinitely instead of playing the stream. </span></div><div><span style="line-height:1.5"><br></span></div><div><div>+>ffplay -i test_vorbis_stereo.sdp -protocol_whitelist file,udp,rtp</div><div>ffplay version N-78598-g98a0053 Copyright (c) 2003-2016 the FFmpeg developers</div><div> built with gcc 5.3.0 (GCC)</div><div> configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib</div><div> libavutil 55. 18.100 / 55. 18.100</div><div> libavcodec 57. 24.103 / 57. 24.103</div><div> libavformat 57. 25.101 / 57. 25.101</div><div> libavdevice 57. 0.101 / 57. 0.101</div><div> libavfilter 6. 34.100 / 6. 34.100</div><div> libswscale 4. 0.100 / 4. 0.100</div><div> libswresample 2. 0.101 / 2. 0.101</div><div> libpostproc 54. 0.100 / 54. 0.100</div><div> nan : 0.000 fd= 0 aq= 0KB vq= 0KB sq= 0B f=0/0</div></div><div>(...stays here indefinitely)</div><div><br></div><div>Does the difference in dynamic payload ids 96 and 97 make any difference? </div><div><br></div><div><br></div><div>ytan</div></div></div>