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• Streaming H.264 over UDP using FFmpeg, and "dimensions not set" error

  3 septembre 2015, par Baris Demiray

  I’m trying to stream H.264 over UDP with no luck so far. Here is a minimal code that you can reproduce the problem.

  To compile,

  g++ -o test -lavcodec -lavformat -lavutil test.cpp

  Extra information, I start ffplay as follows. Currently it’s of no use.

  ffplay -i udp://127.0.0.1:8554/live.sdp

  Output of my code (see avio_open() call),

  [libx264 @ 0x6a26c0] using mv_range_thread = 24
  
  [libx264 @ 0x6a26c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1 Cache64
  
  [libx264 @ 0x6a26c0] profile High, level 3.1
  
  Output #0, h264, to 'udp://127.0.0.1:8554/live.sdp':
  
      Stream #0:0, 0, 0/0: Video: h264 (libx264), -1 reference frame, none, q=-1--1
  
  [h264 @ 0x6a2020] dimensions not set
  
  Cannot write header to stream: Success

  And the code,

  extern "C" {
  
      #include <libavcodec></libavcodec>avcodec.h>
  
      #include <libavformat></libavformat>avformat.h>
  
      #include <libavutil></libavutil>avutil.h>
  
  }
  
  
  
  #include <iostream>
  
  using namespace std;
  
  
  
  int main() {
  
      AVCodecContext* m_codecContext;
  
      AVCodec* m_codec;
  
      AVFormatContext* m_formatContext;
  
      AVStream* m_stream;
  
  
  
      unsigned m_outWidth = 768;
  
      unsigned m_outHeight = 608;
  
  
  
      av_register_all();
  
      avcodec_register_all();
  
      avformat_network_init();
  
  
  
      int errorStatus = 0;
  
      char errorLog[128] = { 0 };
  
      av_log_set_level(AV_LOG_TRACE);
  
  
  
      string m_output("udp://127.0.0.1:8554/live.sdp");
  
  
  
      if (avformat_alloc_output_context2(&amp;m_formatContext, NULL, "h264", m_output.c_str()) &lt; 0) {
  
          cerr &lt;&lt; "Cannot allocate output context: "
  
               &lt;&lt; av_make_error_string(errorLog, 128, errorStatus) &lt;&lt; endl;
  
          return -1;
  
      }
  
  
  
      AVOutputFormat *m_outputFormat = m_formatContext->oformat;
  
  
  
      m_codec = avcodec_find_encoder(AV_CODEC_ID_H264);
  
      if (!m_codec) {
  
          cerr &lt;&lt; "Cannot find an encoder: "
  
               &lt;&lt; av_make_error_string(errorLog, 128, errorStatus) &lt;&lt; endl;
  
          return -1;
  
      }
  
  
  
      m_codecContext = avcodec_alloc_context3(m_codec);
  
      if (!m_codecContext) {
  
          cerr &lt;&lt; "Cannot allocate a codec context: "
  
               &lt;&lt; av_make_error_string(errorLog, 128, errorStatus) &lt;&lt; endl;
  
          return -1;
  
      }
  
  
  
      m_codecContext->pix_fmt = AV_PIX_FMT_YUV420P;
  
      m_codecContext->width = m_outWidth;
  
      m_codecContext->height = m_outHeight;
  
  
  
      if (avcodec_open2(m_codecContext, m_codec, NULL) &lt; 0) {
  
          cerr &lt;&lt; "Cannot open codec: "
  
               &lt;&lt; av_make_error_string(errorLog, 128, errorStatus) &lt;&lt; endl;
  
          return -1;
  
      }
  
  
  
      m_stream = avformat_new_stream(m_formatContext, m_codec);
  
      if (!m_stream) {
  
          cerr &lt;&lt; "Cannot create a new stream: "
  
               &lt;&lt; av_make_error_string(errorLog, 128, errorStatus) &lt;&lt; endl;
  
          return -1;
  
      }
  
  
  
      av_dump_format(m_formatContext, 0, m_output.c_str(), 1);
  
  
  
      if ((errorStatus = avio_open(&amp;m_formatContext->pb, m_output.c_str(), AVIO_FLAG_WRITE)) &lt; 0) {
  
          cerr &lt;&lt; "Cannot open output: "
  
               &lt;&lt; av_make_error_string(errorLog, 128, errorStatus) &lt;&lt; endl;
  
          return -1;
  
      }
  
  
  
      if (avformat_write_header(m_formatContext, NULL) &lt; 0) {
  
          cerr &lt;&lt; "Cannot write header to stream: "
  
               &lt;&lt; av_make_error_string(errorLog, 128, errorStatus) &lt;&lt; endl;
  
          return -1;
  
      }
  
  
  
      cout &lt;&lt; "All done." &lt;&lt; endl;
  
  
  
      return 0;
  
  }
  
  </iostream>

  For those who has even more time to spare on my problem, when I change m_output to rtsp://127.0.0.1:8554/live.sdp, and ffplay command to ffplay -rtsp_flags listen -i rtsp://127.0.0.1:8554/live.sdp I get the error,

  [libx264 @ 0x1e056c0] using mv_range_thread = 24
  
  [libx264 @ 0x1e056c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1 Cache64
  
  [libx264 @ 0x1e056c0] profile High, level 3.1
  
  Output #0, h264, to 'rtsp://127.0.0.1:8554/live.sdp':
  
      Stream #0:0, 0, 0/0: Video: h264 (libx264), -1 reference frame, none, q=-1--1
  
  Cannot open output: Protocol not found

  Am I naive to expect that streaming protocol will be changed like this ?

• How to deal with "Buffer queue overflow, dropping." (ffmpeg)

  1er mai 2015, par whitesiroi

  Sometimes it works great and sometimes I’m getting this message
  [Parsed_overlay_0 @ 0x7f9520518800] [framesync @ 0x7f9521021e28] Buffer queue overflow, dropping.

  by running this command
  ffmpeg -i a1.mp4 -i watermark150x125.png -filter_complex 'overlay=10:10' output.mp4

  I tried different variation of "overlay" like overlay=W-w-5:H-h-5, overlay=10:main_h-overlay_h-10, overlay=main_w-overlay_w-10:main_h-overlay_h-10 - getting the same result.

  Here is the output of the ffmpeg command.

  ffmpeg version 2.6.2 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with Apple LLVM version 6.1.0 (clang-602.0.49) (based on LLVM 3.6.0svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.6.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda
  
    libavutil      54. 20.100 / 54. 20.100
  
    libavcodec     56. 26.100 / 56. 26.100
  
    libavformat    56. 25.101 / 56. 25.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.102 /  5. 11.102
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f952101d200] stream 0, timescale not set
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'a1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      artist          : a1
  
      album           :
  
      comment         : 
  
      date            : 0
  
      genre           :
  
      title           : a1
  
      encoder         : Lavf56.4.101
  
    Duration: 00:01:41.51, start: 0.000000, bitrate: 227 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 426x240 [SAR 1:1 DAR 71:40], 97 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:2: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 120x90 [SAR 1:1 DAR 4:3], 90k tbr, 90k tbn, 90k tbc
  
  Input #1, png_pipe, from 'watermark150x125.png':
  
    Duration: N/A, bitrate: N/A
  
      Stream #1:0: Video: png, rgba, 150x125 [SAR 2835:2835 DAR 6:5], 25 tbr, 25 tbn, 25 tbc
  
  [swscaler @ 0x7f9521013e00] deprecated pixel format used, make sure you did set range correctly
  
  [libx264 @ 0x7f9521030e00] using SAR=1/1
  
  [libx264 @ 0x7f9521030e00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x7f9521030e00] profile High, level 2.1
  
  [libx264 @ 0x7f9521030e00] 264 - core 144 r2533 c8a773e - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=-2 threads=6 lookahead_threads=1 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=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      artist          : a1
  
      album           :
  
      comment         : 
  
      date            : 0
  
      genre           :
  
      title           : a1
  
      encoder         : Lavf56.25.101
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 426x240 [SAR 1:1 DAR 71:40], q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)
  
      Metadata:
  
        encoder         : Lavc56.26.100 libx264
  
      Stream #0:1(und): Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, s16, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
        encoder         : Lavc56.26.100 libvo_aacenc
  
  Stream mapping:
  
    Stream #0:0 (h264) -> overlay:main (graph 0)
  
    Stream #0:2 (mjpeg) -> overlay:overlay (graph 0)
  
    overlay (graph 0) -> Stream #0:0 (libx264)
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (libvo_aacenc))
  
  Press [q] to stop, [?] for help
  
  [Parsed_overlay_0 @ 0x7f9520518800] [framesync @ 0x7f9521021e28] Buffer queue overflow, dropping.
  
      Last message repeated 385 times
  
  [Parsed_overlay_0 @ 0x7f9520518800] [framesync @ 0x7f9521021e28] Buffer queue overflow, dropping.
  
      Last message repeated 564 times
  
  [Parsed_overlay_0 @ 0x7f9520518800] [framesync @ 0x7f9521021e28] Buffer queue overflow, dropping.
  
      Last message repeated 546 times
  
  [Parsed_overlay_0 @ 0x7f9520518800] [framesync @ 0x7f9521021e28] Buffer queue overflow, dropping.
  
      Last message repeated 569 times
  
  [Parsed_overlay_0 @ 0x7f9520518800] [framesync @ 0x7f9521021e28] Buffer queue overflow, dropping.
  
      Last message repeated 593 times
  
  [Parsed_overlay_0 @ 0x7f9520518800] [framesync @ 0x7f9521021e28] Buffer queue overflow, dropping.
  
      Last message repeated 312 times
  
  frame= 3041 fps=645 q=-1.0 Lsize=    1800kB time=00:01:41.52 bitrate= 145.3kbits/s dup=2975 drop=0
  
  video:149kB audio:1587kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.700745%
  
  [libx264 @ 0x7f9521030e00] frame I:14    Avg QP:19.91  size:  6947
  
  [libx264 @ 0x7f9521030e00] frame P:768   Avg QP:10.30  size:    27
  
  [libx264 @ 0x7f9521030e00] frame B:2259  Avg QP:13.67  size:    15
  
  [libx264 @ 0x7f9521030e00] consecutive B-frames:  0.9%  0.1%  0.1% 98.9%
  
  [libx264 @ 0x7f9521030e00] mb I  I16..4: 18.7% 59.0% 22.3%
  
  [libx264 @ 0x7f9521030e00] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.1%  0.0%  0.0%  0.0%  0.0%    skip:99.9%
  
  [libx264 @ 0x7f9521030e00] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.1%  0.0%  0.0%  direct: 0.0%  skip:99.9%  L0:50.7% L1:49.3% BI: 0.0%
  
  [libx264 @ 0x7f9521030e00] 8x8 transform intra:59.1% inter:31.9%
  
  [libx264 @ 0x7f9521030e00] coded y,uvDC,uvAC intra: 21.4% 12.4% 7.4% inter: 0.0% 0.0% 0.0%
  
  [libx264 @ 0x7f9521030e00] i16 v,h,dc,p: 39% 30% 30%  0%
  
  [libx264 @ 0x7f9521030e00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 34% 47% 16%  1%  0%  0%  1%  0%  1%
  
  [libx264 @ 0x7f9521030e00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 38% 15%  3%  3%  3%  6%  4%  7%
  
  [libx264 @ 0x7f9521030e00] i8c dc,h,v,p: 80% 15%  4%  1%
  
  [libx264 @ 0x7f9521030e00] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x7f9521030e00] ref P L0: 96.5%  1.2%  2.3%
  
  [libx264 @ 0x7f9521030e00] ref B L0: 51.5% 48.5%
  
  [libx264 @ 0x7f9521030e00] ref B L1: 99.6%  0.4%
  
  [libx264 @ 0x7f9521030e00] kb/s:11.97

• ffmpeg "Option preset not found."

  2 février 2015, par PiTheNumber

  I am trying to convert a .mpg to .flv with ffmpeg. On other servers I got it working but here with the ffmpeg clone (avconv) it just does not do it.

  Originally I was working with libfaac and preset fastfirstpass but thats not available in this build so I switched to the experimental acc and preset libx264-fast_firstpass :

  $ /usr/bin/ffmpeg -i /data/upload/videos/original/150128_Test_731_9d5b83.mpg
  
    -strict experimental -acodec aac -ab 128k -ar 44100 -vcodec libx264 -pass 1 
  
    -pre libx264-fast_firstpass -b 512k -s 360x204 
  
    -f flv /data/upload/videos/encoded/150129_Test_731_54f06a.flv
  
  
  
  avconv version 9.16-6:9.16-0ubuntu0.14.04.1, Copyright (c) 2000-2014 the Libav developers
  
    built on Aug 10 2014 18:16:02 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
  [mpeg @ 0xc87de0] max_analyze_duration reached
  
  Guessed Channel Layout for  Input Stream #0.1 : stereo
  
  Input #0, mpeg, from '/data/upload/videos/original/150128_Test_731_9d5b83.mpg':
  
    Duration: 00:01:00.12, start: 0.989978, bitrate: 4814 kb/s
  
      Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x406 [PAR 406:405 DAR 16:9], 104857 kb/s, 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
  
      Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16p, 224 kb/s
  
  [libx264 @ 0xc8b4c0] using SAR=136/135
  
  [libx264 @ 0xc8b4c0] MB rate (26910000) > level limit (2073600)
  
  [libx264 @ 0xc8b4c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  [libx264 @ 0xc8b4c0] profile Main, level 5.2
  
  [libx264 @ 0xc8b4c0] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x1:0 me=dia subme=2 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=3 lookahead_threads=1 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=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=30 rc=abr mbtree=1 bitrate=512 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.25 aq=1:1.00
  
  Option preset not found.

  What does the error in the last line mean ?

  I already made sure the preset libx264-fast_firstpass.avpreset exists in /usr/share/avconv/ and if I change it to invalid ffmpeg complains with Preset invalid specified for stream 0:0, but could not be opened., so the preset is correct.

  Google does provide two results for this error. This chatlog and it’s pastebin about live streaming with the solution to add -f flv and some russian page. Nothing helped.

  Any advice ?