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• ffmpeg : consider increasing probesize error, but it is never satisfied

  27 janvier 2021, par Jaz

  I was trying to use an Arch solution for streaming to twitch today through FFMPEG, but all of my attempts were in vain because of one simple thing on FFMPEG. it says that the probesize is not large enough, so I instinctively increased the probesize value more and more... and now it is -probesize "500M" yet it is still saying it is not enough. here is the code snippet

  


  [x11grab @ 0x5631f846cd00] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, x11grab, from ':0.0':
  Duration: N/A, start: 1603397505.341400, bitrate: 1007124 kb/s
    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1366x768, 1007124 kb/s, 30 fps, 1000k tbr, 1000k tbn, 1000k tbc
0: Input/output error


  


  and the code

  


  #!/bin/bash
     INRES="1366x768" # input resolution
     OUTRES="1366x768" # output resolution
     FPS="30" # target FPS
     GOP="60" # i-frame interval, should be double of FPS,
     GOPMIN="30" # min i-frame interval, should be equal to fps,
     THREADS="2" # max 6
     CBR="1000k" # constant bitrate (should be between 1000k - 3000k)
     QUALITY="ultrafast"  # one of the many FFMPEG preset
     AUDIO_RATE="44100"
     PROBESZ="500M" # specify a size for the ffmpeg tool to assess frames
     STREAM_KEY="$1" # paste the stream key after calling stream_now
     SERVER="live-mia" # twitch server in miami Florida, see https://stream.twitch.tv/ingests/ for list

     ffmpeg -f x11grab -s "$INRES" -r "$FPS" -i :0.0 -f pulse -i 0 -f flv -ac 2 -ar $AUDIO_RATE \
       -vcodec libx264 -g $GOP -keyint_min $GOPMIN -b:v $CBR -minrate $CBR -maxrate $CBR -pix_fmt yuv420p\
       -s $OUTRES -preset $QUALITY -tune film -acodec aac -threads $THREADS -strict normal \
       -bufsize $CBR -probesize $PROBESZ "rtmp://$SERVER.twitch.tv/app/$STREAM_KEY"


  


  even though it was a solution to store in .bashrc, I stored it in a script to call manually.

  


  and if this is helpful, here is the fancy banner ffmpeg shows before the error

  


  ffmpeg version n4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.1.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvdec --enable-nvenc --enable-omx --enable-shared --enable-version3
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100


  


• Looking for a multimedia SDK (open source or paid) which can play audio (.mp3, .aac) and video (.mp4 etc.)

  8 avril 2022, par AhmadH

  I would like to embed audio (and video) files in my cross platform application.
Searching for an SDK with below functionality :

  


  

  1. Play audio - .mp3,.aac (are must) & other common formats

  


  2. Play video - .mp4 & other common formats

  


  3. Audio recording would be an added advantage.

  


  4. Open source or affordable price

  


  


  [ Note : FFmpeg is not an option due to some License restriction]

  


  **Anything that has all FFmpeg properties would be ideal.

  


  Looking online but haven't found any suitable option.
Please help.

  


• Multiple applications to access the same DeckLink device (openCV and rtmp pushing) ? What options do I have ?

  7 septembre 2020, par Giorgi Aptsiauri

  Description :

  


  I have a requirement that I must do two things to a single camera stream from a DeckLink device - OpenCV processing and RTMP live streaming. If it is relevant, the device is DeckLink 8K Pro.

  


  The DeckLink device (one particular port) does not allow more than one application to access the video stream. My two applications are :

  


  

  • C++ OpenCV application which must run image processing algorithms on the video stream.

  


  • Unreal Media Server which must RTMP push the stream to a remote endpoint, which should redistribute the stream to clients.

  


  


  Both applications must be running on the same Windows workstation.

  


  Problem :

  


  If either application is running, it has exclusive access to the video stream and the other application cannot read the stream, and there seems to be no solution to this problem.

  


  So, I am really looking for a smart solution some of you may have implemented before or have an idea which might work for me.

  


  My solution so far :

  


  In this solution, Unreal Media Server is replaced with FFMPEG.

  


  Since OP's effort must be put into the solution before posting here, I have been browsing through possible solutions the past week. I came up with an FFMPEG-based solution which is the only application which reads the DeckLink video stream and does exactly two things in a single command - pushes video packets via RTMP and creates a local UDP stream. And, OpenCV's VideoCapture class is able to pick up UDP stream. For testing, I have used Twitch as RTMP server and VLC as UDP tester. It works and it seems like a good solution except for the delay introduced in UDP streaming which is about 0.4 seconds. Unfortunately, I am not able to evaluate RTMP delay because Twitch introduces its own >5s delay on its own. But that is not a problem for now.

  


  Here's the FFMPEG solution (Note I am using computer webcam here but same goes for DeckLink).

  


  Steram via :

  


  ffmpeg -threads:v 2 -threads:a 8 -filter_threads 2 -thread_queue_size 512 -y -f dshow -video_size 640x480 -pixel_format yuyv422 -framerate 30 -rtbufsize 100M -i video="HD WebCam" -f dshow -rtbufsize 100M -i audio="Microphone Array (Realtek High Definition Audio(SST))" -preset ultrafast -vcodec libx264 -tune zerolatency -b 900k -map 0:v:0 -f mpegts udp://127.0.0.1:5555 -pix_fmt yuv420p -c:v libx264 -qp:v 19 -profile:v high -rc:v cbr_ld_hq -level:v 4.2 -r:v 60 -g:v 120 -bf:v 3 -refs:v 16 -f flv rtmp://live-fra05.twitch.tv/app/stream_key


  


  Play via :

  


  ffplay -probesize 32 -sync ext udp://127.0.0.1:5555


  


  I want to hear how you would improve my own solution to better fit the problem (e.g. less latency) or if you have a better solution than mine.

  


  Thanks in advance.