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• FFmpeg downmuxing multiple tracks with custom "af"s

  26 août 2020, par CasualDemon

  I am trying to do a custom downmix conversion, that is the rough equivalent of :

  


  ffmpeg -y -i "file.mkv" \
 -map 0:1 -c:0 flac -ac:0 4 \
 -map 0:3 -c:1 flac -ac:1 3 \
 -map 0:3 -c:2 flac -ac:2 3 \
 audio.mkv


  


  I tried using the command :

  


  ffmpeg -y -i "file.mkv" \
 -map 0:1 -c:0 flac -af:0 "pan=3.1| FL < FL + 0.6*BL + 0.6*SL | FR < FR + 0.6*BR + 0.6*SR | FC = FC | LFE = LFE" \
 -map 0:3 -c:1 flac -af:1 "pan=2.1| FL < FL + 0.6*BL + 0.6*SL + 0.5*FC | FR < FR + 0.6*BR + 0.6*SR + 0.5*FC | LFE = LFE" \
 -map 0:3 -c:2 flac -af:2 "pan=2.1| FL < FL + 0.6*BL + 0.6*SL + 0.5*FC + 0.5*LFE | FR < FR + 0.6*BR + 0.6*SR + 0.5*FC  + 0.5*LFE" \
 audio.mkv


  


  But it gave an error that only 1 "af" is supported, unlike "ac" :

  


  Only '-af pan=2.1| FL < FL + 0.6*BL + 0.6*SL + 0.5*FC + 0.5*LFE | FR < FR + 0.6*BR + 0.6*SR + 0.5*FC  + 0.5*LFE | LFE = FC' read, ignoring remaining -af options: Use ',' to separate filters


  


  So I tried doing as it said, and separated them with a comma :

  


  ffmpeg -y -i "file.mkv" \
 -map 0:1 -c:0 flac \
 -map 0:3 -c:1 flac \
 -map 0:3 -c:2 flac \
 -af "pan=3.1| FL < FL + 0.6*BL + 0.6*SL | FR < FR + 0.6*BR + 0.6*SR | FC = FC | LFE = LFE,pan=2.1| FL < FL + 0.6*BL + 0.6*SL + 0.5*FC | FR < FR + 0.6*BR + 0.6*SR + 0.5*FC | LFE = LFE,pan=2.1| FL < FL + 0.6*BL + 0.6*SL + 0.5*FC + 0.5*LFE | FR < FR + 0.6*BR + 0.6*SR + 0.5*FC  + 0.5*LFE | LFE = LFE" \
 audio.mkv


  


  Which started the encoding, but I noticed that it was only applying the last pan, and all three tracks were being downmixed to the last 2.1 !

  


  According to the documentation, https://ffmpeg.org/ffmpeg-filters.html#Filtergraph-syntax-1 adding a "," is creating a "filterchain" which I don't think I want, as I am doing the same filter on three different tracks. So I am at a loss of what I am supposed to do from there.

  


  Thanks for any help !

  


• How to bybass any site that restrict multiple live streaming broadcast on a single account ? [closed]

  4 août 2024, par kino pizdec

  I am looking for a working way to use 1 video.mp4 input for 1 site, for 1 account, but broadcast in several output, for example, to different rtmp servers or stream keys. Something similar is seen on YouTube, where 1 channel has many live streams.

  


  I want to do the same, but for another site that offers the following connection options :

  


  

  • rtmp server and stream key

  


  • Real webcam

  


  • OBS Virtual webcam

  


  


  I've seen it's possible. People stream up to 4 streams simultaneously on 1 account with 1 video. The question is how.

  


  I have been tormenting the chat GPT for several days and trying different options for writing code for ffmpeg, but I have not been able to achieve more than 2 streams at the same time. I have already managed to make 2 streams at the same time twice, but I have completely forgotten how to do this, because I am constantly trying new code configurations in ffmpeg.

  


  Here is code that I use to attempt to solve my issue.

  


  @echo off
setlocal EnableDelayedExpansion

set "VIDEO_FILE=E:\MegaStream\VIDEO.mp4"

set "streams="
for /f "delims=" %%a in (stream_config.txt) do (
    set "streams=!streams! -f flv %%a"
)

:loop
start /b ffmpeg.exe ^
-re ^
-stream_loop -1 ^
-i "!VIDEO_FILE!" ^
-c:v libx264 ^
-preset veryfast ^
-tune zerolatency ^
-b:v 4000k ^
-maxrate 4400k ^
-bufsize 8000k ^
-pix_fmt yuv420p ^
-g 60 ^
-keyint_min 60 ^
-sc_threshold 0 ^
-r 30 ^
-c:a aac ^
-b:a 96k ^
-ar 44100 ^
-threads 4 ^
-x264opts "nal-hrd=cbr:force-cfr=1" ^
-max_muxing_queue_size 1024 ^
-map 0:v:0 -map 0:a:0 !streams!
-loglevel debug

echo Streaming... Press 'Q' to quit or 'R' to restart.
:input
choice /c QR /n >nul
if errorlevel 2 (
    taskkill /F /IM ffmpeg.exe >nul 2>&1
    echo Restarting stream...
    goto loop
) else if errorlevel 1 (
    taskkill /F /IM ffmpeg.exe >nul 2>&1
    echo Quitting...
    exit /b
)
goto input 


  


  Plus config file with 2 separate lines :
rtmp server 1 / stream key 1
rtmp server 2/ stream key 1

  


  I play a lot with config file and code. I edited them differently so many times so once it worked and site played my 2 stream simultaneously but now I struggle with consistent solution. Would love to hear any guesses on how to bypass these rules.
P.s.
I'm already advised many times on ethitcs and usage of this method, so I'm concerned thanks.

  


  What does not work :

  


  

  • Launching 2 copies of OBS with different servers and stream keys gives an error

  


  • Plugin for multistreaming OBS

  


  • Using 2 devices, site says "You already have a streaming sesssion" and offers to finish first to start second

  


  


• Compile FFmpeg with x264 for MacOS and Windows on Linux

  9 mars 2023, par RobinFrcd

  I successfully managed to compile a minimal standalone FFmpeg binary to create MP4 videos from JPG images encoded with x264. The binary is 100% functional and is 5.2MB.

  


  To do that, I used :

  


  ./configure \
--disable-everything \
--enable-decoder=mjpeg \
--enable-encoder=libx264 \
--enable-protocol=concat,file \
--enable-demuxer=image2 \
--enable-muxer=mp4 \
--enable-filter=scale \
--enable-gpl \
--enable-libx264 \
--extra-ldexeflags="-static" \
--pkg-config="pkg-config --static"


  


  I now would like to build the macOS and windows binaries directly from my Linux machine. I tried this repo and replaced the config args with mine, but the output exe is 30MB+. And I don't find anything about building for MacOS.

  


  Is there a solution to make this minimal build cross-platform compatible ?