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• How to solve Jiiter Buffer problem in receiving audio RTP stream (bad sound quality) in PJSIP ?

  1er août 2019, par Mayur Patel

  I’m a newbie to pjsip and want to build an RTP stream receiver using pjsip.

  Setup :

  I want to use specific L16/16000/1 codec and have also enabled it in "config_site.h" during compiling the pjsip project and checked that its available

  Receiver :

  • BeagleBone
  • CrossCompiled Pjsip and Installed all req. libs and sample apps

  Sender :

  • Another Windows PC in the same Network using FFmpeg to transmit Audio Stream via Multicast

  I got to know about streamutil.c(pjsip sample-apps) which does similar things to send and receive both. Now for the sake of easyness, I’m using the same Cross-Compiled binary streamutil.

  SENDER :

  ..\ffmpeg -re -stream_loop -1 -i test.mp3 -ar 16000 -acodec pcm_s16be -b:a 128k -ac 1 -payload_type 123 -f rtp udp://239.255.255.211:5500?pkt_size=652
  
  
  
  ......
  
  Output #0, rtp, to 'udp://239.255.255.211:5500?pkt_size=652':
  
    Metadata:
  
      title           : -----
  
      artist          : --------
  
      album           : -------
  
      date            : 2019
  
      track           : 1
  
      encoder         : Lavf58.20.100
  
      Stream #0:0: Audio: pcm_s16be, 16000 Hz, mono, s16, 256 kb/s
  
      Metadata:
  
        encoder         : Lavc58.35.100 pcm_s16be
  
  SDP:
  
  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=GREATEST HITS (2) [1 HOUR 20 MINUTES LONG]
  
  c=IN IP4 239.255.255.211/5
  
  t=0 0
  
  a=tool:libavformat 58.26.101
  
  m=audio 5500 RTP/AVP 123
  
  b=AS:256
  
  a=rtpmap:97 L16/16000/1
  
  a=rtpmap:123 L16/16000/1
  
  a=control:streamid=
  
  
  
  size=     833kB time=00:00:25.91 bitrate= 263.4kbits/s speed=   1x

  RECIEVER LOG :

  ./streamutil --mcast-addr=239.255.255.211 --recv-only --codec=L16/16000/1
  
  ...
  
  ...
  
  17:05:05.178     strm0x55dee1537f48  Jitter buffer starts returning normal frames (after 1 empty/lost)
  
  17:05:05.246     strm0x55dee1537f48  Jitter buffer empty (prefetch=0), plc invoked
  
  17:05:05.266     strm0x55dee1537f48  Jitter buffer starts returning normal frames (after 1 empty/lost)
  
  17:05:05.325     strm0x55dee1537f48  Jitter buffer empty (prefetch=0), plc invoked
  
  17:05:05.344     strm0x55dee1537f48  Jitter buffer starts returning normal frames (after 1 empty/lost)
  
  17:05:05.422     strm0x55dee1537f48  Jitter buffer empty (prefetch=0), plc invoked

  Tried So far :

  • set different payload_type
  • set specific codec in streamutil as parameter
  • all other parameters in FFmpeg ex. bitrate, clockrate, channels

  Check working stream

  I am facing no issue, if I use a *.sdp file to receive RTP stream in VLC.

  SDP file :

  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=GREATEST HITS (2) [1 HOUR 20 MINUTES LONG]
  
  c=IN IP4 239.255.255.211/5
  
  t=0 0
  
  a=tool:libavformat 58.26.101
  
  m=audio 5500 RTP/AVP 123
  
  b=AS:256
  
  a=rtpmap:97 PCMU/8000/1
  
  a=rtpmap:123 PCMU/8000/1
  
  a=control:streamid=

  I have googled a lot but stuck now at this problem.
  So finally my question is that,
  How can I get the same Output via Pjsip without this Jitter Buffer logging and dropped sound ?

  Any help would be greatly appreciated.!

• Could not find codec parameters for stream 0 (Video : png, none)

  22 août 2019, par Vipul Solanki

  I’m trying to overlap png over jpg but getting bellow error. I’ve tried in FFMPEG version 3.4.6 and GCC 5.5.0

  ffmpeg -i Emily-Bett-Rickards.jpg -i abc.png -filter_complex "[0:v][1:v] overlay=(W-w)/2:(H-h)/2:enable='between(t,0,20)'" -pix_fmt yuv420p -c:a copy bc38775d-278d-41f0-821f-89917475200b-meta.jpg
  
  ffmpeg version N-94608-gaeae628 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 5.5.0 (Ubuntu 5.5.0-12ubuntu1~16.04) 20171010
  
    configuration: --enable-decoder='mjpeg,png' --enable-demuxer=image2 --enable-protocol=file
  
    libavutil      56. 33.100 / 56. 33.100
  
    libavcodec     58. 55.100 / 58. 55.100
  
    libavformat    58. 31.101 / 58. 31.101
  
    libavdevice    58.  9.100 / 58.  9.100
  
    libavfilter     7. 58.100 /  7. 58.100
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
  Input #0, image2, from 'Emily-Bett-Rickards.jpg':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: 34289 kb/s
  
      Stream #0:0: Video: mjpeg (Progressive), yuvj444p(pc, bt470bg/unknown/unknown), 600x400, 25 tbr, 25 tbn, 25 tbc
  
  [png_pipe @ 0x389fdc0] Could not find codec parameters for stream 0 (Video: png, none): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #1, png_pipe, from 'abc.png':
  
    Duration: N/A, bitrate: N/A
  
      Stream #1:0: Video: png, none, 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 (mjpeg) -> overlay:main
  
    Stream #1:0 (?) -> overlay:overlay
  
    overlay -> Stream #0:0 (mjpeg)
  
  Decoder (codec png) not found for input stream #1:0

  Any help would be appreciated.

• Windows video player cannot play cropped video from ffmpeg

  28 juillet 2019, par Chen Clarence

  I am trying to crop video with ffmpeg, I have encountered three problems.
  First, I used the following code to crop a 1080p video.

  ffmpeg -i 1080vid.avi -vf "crop=1920:1080:0:0" -c:v libx264 -crf 1 -c:a copy output.mp4

  However, in the compression rate argument, it only works if I set -crf to a positive value. If I set it to 0, then the output video cannot be played by my Windows 10 video player. However, since I am pursuing a lossless conversion, this is problematic. The output mp4 is smaller than 5% of the original size.

  The original goal was to cut a 1080*15360 video into 8 1080p videos. However, using the following code, I get unplayable output after playing with all the settings.

  ffmpeg -i sample.avi -vf "crop=1920:1080:0:0" -c:v libx264 -crf 1 -c:a copy output.mp4

  The input sample.avi is a lossless avi with bitrate larger than 1GB/s, and the output is a 70kb unplayable file. When opened, a pop up window displays :

  Choose something else to play. This item is in a format we don't support.
  
  0xc00d36b4

  The following is the command line output.

  ffmpeg version N-94396-g47b6ca0b02 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.1.1 (GCC) 20190716
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  
    libavutil      56. 32.100 / 56. 32.100
  
    libavcodec     58. 55.100 / 58. 55.100
  
    libavformat    58. 30.100 / 58. 30.100
  
    libavdevice    58.  9.100 / 58.  9.100
  
    libavfilter     7. 58.100 /  7. 58.100
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  Input #0, avi, from 'sample.avi':
  
    Metadata:
  
      date            : 2019-07-26T07:09:04.185811
  
    Duration: 00:00:03.00, start: 0.000000, bitrate: 11932176 kb/s
  
      Stream #0:0: Video: rawvideo, bgr24, 15360x1080, 12066071 kb/s, 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc
  
  File 'output.mp4' already exists. Overwrite ? [y/N] y
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 000002a4a910b900] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 000002a4a910b900] profile High 4:4:4 Predictive, level 6.0, 4:4:4, 8-bit
  
  [libx264 @ 000002a4a910b900] 264 - core 157 r2970 5493be8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'output.mp4':
  
    Metadata:
  
      date            : 2019-07-26T07:09:04.185811
  
      encoder         : Lavf58.30.100
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv444p, 15360x1080, q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc
  
      Metadata:
  
        encoder         : Lavc58.55.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  frame=   90 fps=8.0 q=-1.0 Lsize=      65kB time=00:00:02.90 bitrate= 183.7kbits/s speed=0.258x
  
  video:63kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.042484%
  
  [libx264 @ 000002a4a910b900] frame I:1     Avg QP: 0.35  size: 22252
  
  [libx264 @ 000002a4a910b900] frame P:23    Avg QP: 0.09  size:   476
  
  [libx264 @ 000002a4a910b900] frame B:66    Avg QP: 0.00  size:   467
  
  [libx264 @ 000002a4a910b900] consecutive B-frames:  2.2%  0.0%  0.0% 97.8%
  
  [libx264 @ 000002a4a910b900] mb I  I16..4: 92.1%  6.5%  1.5%
  
  [libx264 @ 000002a4a910b900] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.0%  0.0%  0.0%  0.0%  0.0%    skip:100.0%
  
  [libx264 @ 000002a4a910b900] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.0%  0.0%  0.0%  direct: 0.0%  skip:100.0%
  
  [libx264 @ 000002a4a910b900] 8x8 transform intra:6.5% inter:0.0%
  
  [libx264 @ 000002a4a910b900] coded y,u,v intra: 0.4% 0.0% 0.0% inter: 0.0% 0.0% 0.0%
  
  [libx264 @ 000002a4a910b900] i16 v,h,dc,p: 96%  2%  2%  0%
  
  [libx264 @ 000002a4a910b900] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 93%  1%  7%  0%  0%  0%  0%  0%  0%
  
  [libx264 @ 000002a4a910b900] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 42% 25% 31%  0%  0%  0%  0%  0%  0%
  
  [libx264 @ 000002a4a910b900] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 000002a4a910b900] kb/s:170.49