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• FFMPEG problems with real-time buffer

  27 juin 2024, par Charles Kiel

  I'm trying to use FFMPEG (Windows) to encode a stream from a video capture card via dshow and send to a RTMP server. THis is my command line ;

  



      ffmpeg -f dshow -i video="AVerMedia BDA Analog Capture Secondary":audio="Microphone (6- C-Media USB Audi" -vf scale=1280:720 -vcodec libx264 -r 30 -rtbufsize 702000k -acodec mp3 -ac 2 -ar 44100 -ab 128k -pix_fmt yuv420p -tune zerolatency -preset ultrafast -f flv "rtmp://xxx.xxx.xxx.xxx/stream/key"        ffmpeg version N-86950-g1bef008 Copyright (c) 2000-2017 the FFmpeg developers
    built with gcc 7.1.0 (GCC)
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable
    -libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspe
    ex --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-zlib
    libavutil      55. 70.100 / 55. 70.100
    libavcodec     57.102.100 / 57.102.100
    libavformat    57. 76.100 / 57. 76.100
    libavdevice    57.  7.100 / 57.  7.100
    libavfilter     6. 98.100 /  6. 98.100
    libswscale      4.  7.102 /  4.  7.102
    libswresample   2.  8.100 /  2.  8.100
    libpostproc    54.  6.100 / 54.  6.100
    Guessed Channel Layout for Input Stream #0.1 : stereo
    Input #0, dshow, from 'video=AVerMedia BDA Analog Capture Secondary:audio=Microphone (6- C-Media USB Audi':
    Duration: N/A, start: 2035.202000, bitrate: N/A
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 720x480, 29.97 fps, 29.97 tbr, 10000k tbn, 10000k tbc
    Stream #0:1: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
    [dshow @ 00000000005f90e0] real-time buffer [AVerMedia BDA Analog Capture Secondary] [video input] too full or near too full (68% of size: 3041280 [rtbufsize parameter])! frame dropped!
    [dshow @ 00000000005f90e0] real-time buffer [AVerMedia BDA Analog Capture Secondary] [video input] too full or near too full (90% of size: 3041280 [rtbufsize parameter])! frame dropped!
    [dshow @ 00000000005f90e0] real-time buffer [AVerMedia BDA Analog Capture Secondary] [video input] too full or near too full (113% of size: 3041280 [rtbufsize parameter])! frame dropped!
    Last message repeated 46 times
    Stream mapping:
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
    Stream #0:1 -> #0:1 (pcm_s16le (native) -> mp3 (libmp3lame))
    Press [q] to stop, [?] for help
    [dshow @ 00000000005f90e0] real-time buffer [AVerMedia BDA Analog Capture Secondary] [video input] too full or near too full (113% of size: 3041280 [rtbufsize parameter])! frame dropped!
    [libx264 @ 0000000005b16640] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
    [libx264 @ 0000000005b16640] profile Constrained Baseline, level 3.1
    [libx264 @ 0000000005b16640] 264 - core 152 r2851 ba24899 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=2
    1,11 fast_pskip=1 chroma_qp_offset=0 threads=11 lookahead_threads=11 sliced_threads=1 slices=11 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ra
    tio=1.40 aq=0
    [dshow @ 00000000005f90e0] real-time buffer [AVerMedia BDA Analog Capture Secondary] [video input] too full or near too full (113% of size: 3041280 [rtbufsize parameter])! frame dropped!
    Past duration 0.999992 too large


  



  The buffer too full message are non-stop. I can use Open Broadcast Software (OBS) and stream with no problem (I'm pretty sure it also uses ffmpeg), so I'm doing something wrong.

  


• FFmpeg audio problems

  9 juin 2017, par temp account

  Main question is, im not getting audio when the bat file first downloads the video, it only gets the video and not the audio

  Here is my code for my bat file that gets a youtube video URL from their servers via youtube-dl.exe

  It then moves that URL to FFmpeg.exe to download the video.

  @ECHO off
  
  
  
  :Input
  
  ECHO.
  
  SET url=
  
  ECHO Enter Youtube-url:
  
  SET /P url=
  
  IF "%url%" EQU "" GOTO End
  
  IF "%url: =%" NEQ "%url%" GOTO Input
  
  ECHO Enter start time (in seconds, or in hh:mm:ss[.xxx] form):
  
  SET /P start=
  
  ECHO Enter duration (in seconds, or in hh:mm:ss[.xxx] form):
  
  SET /P dur=
  
  ECHO.
  
  FOR /F "delims==" %%A IN ('youtube-dl.exe --no-warnings --get-filename "%url%"') DO SET filename=%%A
  
  FOR /F %%B IN ('youtube-dl.exe -g "%url%"') DO (
  
  ffmpeg.exe -hide_banner -ss "%start%" -i "%%B" -c:v copy -c:a aac -strict experimental -t "%dur%" "%filename%"
  
  )
  
  GOTO Input
  
  
  
  :End

  This is the main part of the bat file thats probably responsible for my audio problem

  ffmpeg.exe -hide_banner -ss "%start%" -i "%%B" -c:v copy -c:a aac -strict experimental -t "%dur%" "%filename%"

  When the video is done downloading, it will ask me

  File 'whatever_video_is_called.mp4' already exists. Overwrite ? [y/N]

  and then it will overwrite the video I just downloaded with its audio file.

• compilation problems of lightspark with ffmpeg

  5 février 2017, par user846940

  I tried to compile latest version of lighstspark from github but did not work.
  I get error related to avcodec. I tried different version of ffmpeg but did not work. Can anybody suggest me what version of ffmpeg version should I use.
  Tried latest ffmpeg from github. few older versions from
  http://ffmpeg.org/releases/

  lihtspark source code available in githib.

  error log :
  https://github.com/lightspark/lightspark/issues/279

  few lines from error log :
  /usr/include/libavutil/channel_layout.h:152:55 : error : declaration of C function ‘uint64_t av_get_default_channel_layout(int)’ conflicts with
  uint64_t av_get_default_channel_layout(int nb_channels) ;
  ^
  In file included from /usr/local/include/libavcodec/avcodec.h:457:0,
  ...................
  decoder.cpp:939:92 : error : ‘avcodec_decode_audio2’ was not declared in this scope

  master/src/backends/decoder.cpp:1079:13 : error : ‘AVProbeData’ has no member named ‘mime_type’
  probeData.mime_type=NULL ;
  ^
  /home/usertest/lightspark-master/src/backends/decoder.cpp:1100:10 : warning : ‘int av_open_input_stream(AVFormatContext**, AVIOContext*, const char*, AVInputFormat*, AVFormatParameters*)’ is deprecated (declared at /usr/local/include/libavformat/avformat.h:1462) [-Wdeprecated-declarations]
  int ret=av_open_input_stream(&formatCtx, avioContext, "lightspark_stream", fmt, NULL) ;
  ^