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• How do the ffmpeg SAP and SDP demuxer interact actually ?

  13 mars 2015, par πάντα ῥεῖ

  I’m about creating a simple (demon) application using the libav*(libavformat) API that is supposed to capture the SAP announcements, and cache the according SDP records payload information into a file based services record list.

  I’m pretty new to ffmpeg, and don’t quite understand how the SAP and SDP demuxer actually interact.

  All of the uses and examples I could find in the ffmpeg environment, are about the standard behavior, that ffmpeg services just try to open the first associated AV stream, as described in the received announcements. But I don’t need to open the AV stream announced with the SDP record, but just to parse the information and add/remove it to/from my cached list of available AV streams.

  I have a (VLC) MiniSAP server running, that broadcasts the SAP/SDP packets in my network. Using the

  AVFormatContext *s = NULL;
  
  int ret = avformat_open_input(&s, "sap://", NULL, NULL);
  
  if (ret < 0)
  
      abort();

  works so far for me, as long I have the MiniSAP server running.

  I just don’t have any clue, how to get an AVFormatContext* for the SDP demuxer in the next step and decode the payload info. I’d be happy even using a decoding callback, since the SDP payload is a pretty simple section/key value pair text format anyway.

  Can anyone point me into the right direction, what to do ?

• When I use ffprobe to check a video stream，I get the error below [closed]

  21 mai 2024, par dongrixinyu

  I came across with a problem when ffprobe and decoding video stream .

  


  Here is the log :

  


  ffprobe version 6.1.1 Copyright (c) 2007-2023 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.2)
  configuration: --enable-gpl --enable-version3 --enable-shared --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-libsnappy --enable-zlib --enable-libsrt --enable-libssh --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libdavs2 --enable-libzvbi --enable-libwebp --enable-libx264 --enable-libx265 --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libmfx --enable-opencl --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libmysofa --enable-librubberband --enable-libsoxr
  libavutil      58. 29.100 / 58. 29.100
  libavcodec     60. 31.102 / 60. 31.102
  libavformat    60. 16.100 / 60. 16.100
  libavdevice    60.  3.100 / 60.  3.100
  libavfilter     9. 12.100 /  9. 12.100
  libswscale      7.  5.100 /  7.  5.100
  libswresample   4. 12.100 /  4. 12.100
  libpostproc    57.  3.100 / 57.  3.100
[NULL @ 0x5595d3e72040] illegal reordering_of_pic_nums_idc 7
[h264 @ 0x5595d3e72040] illegal modification_of_pic_nums_idc 7
[h264 @ 0x5595d3e72040] decode_slice_header error
[h264 @ 0x5595d3e72040] no frame!
[h264 @ 0x5595d3e72040] decode_slice_header error
[h264 @ 0x5595d3e72040] no frame!
[h264 @ 0x5595d3e72040] reference overflow 66 > 15 or 0 > 15
    Last message repeated 1 times
[h264 @ 0x5595d3e72040] decode_slice_header error
[h264 @ 0x5595d3e72040] no frame!
[h264 @ 0x5595d3e72040] chroma_log2_weight_denom 27 is out of range
    Last message repeated 1 times
[h264 @ 0x5595d3e72040] Missing reference picture, default is 4
[h264 @ 0x5595d3e72040] concealing 8144 DC, 8144 AC, 8144 MV errors in P frame
[h264 @ 0x5595d3e72040] top block unavailable for requested intra mode
[h264 @ 0x5595d3e72040] error while decoding MB 4 0, bytestream 12113
[h264 @ 0x5595d3e72040] concealing 8160 DC, 8160 AC, 8160 MV errors in P frame
[h264 @ 0x5595d3e72040] illegal short term buffer state detected
[h264 @ 0x5595d3e72040] top block unavailable for requested intra mode -1
[h264 @ 0x5595d3e72040] error while decoding MB 1 0, bytestream 9617
[h264 @ 0x5595d3e72040] concealing 8160 DC, 8160 AC, 8160 MV errors in P frame
[h264 @ 0x5595d3e72040] illegal short term buffer state detected
[h264 @ 0x5595d3e72040] luma_log2_weight_denom 15 is out of range
    Last message repeated 1 times
[h264 @ 0x5595d3e72040] top block unavailable for requested intra mode
[h264 @ 0x5595d3e72040] error while decoding MB 4 0, bytestream 12323
[h264 @ 0x5595d3e72040] concealing 8160 DC, 8160 AC, 8160 MV errors in P frame
[h264 @ 0x5595d3e72040] illegal short term buffer state detected
[h264 @ 0x5595d3e72040] top block unavailable for requested intra mode -1
[h264 @ 0x5595d3e72040] error while decoding MB 27 0, bytestream 12229
[h264 @ 0x5595d3e72040] concealing 8160 DC, 8160 AC, 8160 MV errors in P frame
[h264 @ 0x5595d3e72040] illegal short term buffer state detected
[h264 @ 0x5595d3e72040] illegal reordering_of_pic_nums_idc 15 
[h264 @ 0x5595d3e72040] illegal modification_of_pic_nums_idc 15
[h264 @ 0x5595d3e72040] decode_slice_header error 
[h264 @ 0x5595d3e72040] no frame!
[h264 @ 0x5595d3e72040] reference count 1 overflow
[h264 @ 0x5595d3e72040] reference count overflow
[h264 @ 0x5595d3e72040] decode_slice_header error 
[h264 @ 0x5595d3e72040] no frame!
[h264 @ 0x5595d3e72040] luma_log2_weight_denom 31 is out of range
[h264 @ 0x5595d3e72040] illegal memory management control operation 21
[h264 @ 0x5595d3e72040] luma_log2_weight_denom 31 is out of range
[h264 @ 0x5595d3e72040] illegal memory management control operation 21
[h264 @ 0x5595d3e72040] deblocking filter parameters -7 0 out of range
[h264 @ 0x5595d3e72040] decode_slice_header error 
[h264 @ 0x5595d3e72040] no frame!
[h264 @ 0x5595d3e72040] Reference 6 >= 3
[h264 @ 0x5595d3e72040] error while decoding MB 29 0, bytestream 8581
[h264 @ 0x5595d3e72040] concealing 8160 DC, 8160 AC, 8160 MV errors in P frame
[h264 @ 0x5595d3e72040] number of reference frames (0+4) exceeds max (3; probably corrupt input), discarding one
[h264 @ 0x5595d3e72040] chroma_log2_weight_denom 15 is out of range
    Last message repeated 1 times
[h264 @ 0x5595d3e72040] deblocking_filter_idc 13 out of range
[h264 @ 0x5595d3e72040] decode_slice_header error 
[h264 @ 0x5595d3e72040] no frame!
[h264 @ 0x5595d3e72040] deblocking_filter_idc 32 out of range
[h264 @ 0x5595d3e72040] decode_slice_header error
[h264 @ 0x5595d3e72040] no frame!
[h264 @ 0x5595d3e72040] illegal reordering_of_pic_nums_idc 31
[h264 @ 0x5595d3e72040] illegal modification_of_pic_nums_idc 31
[h264 @ 0x5595d3e72040] decode_slice_header error 
[h264 @ 0x5595d3e72040] no frame!
[h264 @ 0x5595d3e72040] illegal reordering_of_pic_nums_idc 6
[h264 @ 0x5595d3e72040] illegal modification_of_pic_nums_idc 6
[h264 @ 0x5595d3e72040] decode_slice_header error 



  


  I executed both ffprobe xxxx.mp4 and avcodec receive frame functions to decode one frame. reproduced the same error log.

  


  But when I open it using VLC or OBS it worked well. So,

  


  

  • does any error when I configure the options of ffmpeg ?

  


  • how to fix this problem ?

  


  


  the mp4 file I upload a piece in mp4 link

  


• FFmpeg concat audio with video or gif looping

  30 juillet 2017, par Evandro Klimpel Balmant

  I’m looking for a solution in FFmpeg to merge audio (mp3) with a short video loop, or gif.

  I’ve already been able to generate a video from an image by joining with audio, but the video stays static frame for the audio duration, the command to make this :

  ffmpeg -loop 1 -i imagem.jpg -i audio.mp3 -vcodec h264 -tune stillimage -acodec aac -b:a 64k -pix_fmt yuv420p -shortest video.mp4

  I need video that has the duration of the audio, but that uses a loop of another mp4 or a gif. To keep repeating for the duration of the audio.