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• Add another audio over a file with mixed audio tracks in ffmpeg

  11 mars 2021, par Real Noob

  I have a file that was formed by concatenating three different files : a.mp4, b.mp4 and c.mp4.

  


  do ffmpeg -f concat -i "concat-file.txt" -map 0:v -map 0:a -c:v libx264 -crf 23 -fflags +genpts joined-file.mp4"


  


  After that I run this command, mentioned here : How to add a new audio (not mixing) into a video using ffmpeg ?

  


  ffmpeg -i joined-file.mp4 -i audio.mp3 -filter_complex "[0:a][1:a]amerge=inputs=2[a]" -map 0:v -map "[a]" -c:v copy -ac 2 -shortest output.mp4


  


  What is causing this issue ?

  


  Thanks. :)

  


  UPDATE :

  


  Here are the commands that I have been running :

  


  ffmpeg -i "middle/b.mp4" -c:v copy -video_track_timescale 30k -c:a aac -ac 6 -ar 44100 -shortest "wrap/b.mp4"
ffmpeg -f concat -i "concat-file.txt" -map 0:v -map 0:a -c:v libx264 -crf 23 -fflags +genpts "joined/abc.mp4"
ffmpeg -i "joined/abc.mp4" -i audio.mp3 -filter_complex "[0:a:0][1:a:0]amerge=inputs=2[a]" -map 0:v -map "[a]" -c:v copy -ac 2 -shortest "final/abc-cmplt.mp4"


  


  Here is the "concat-file.txt" :

  


  file 'bits/a.mp4'
file 'wrap/b.mp4'
file 'bits/c.mp4'


  


  All the video files a.mp4, b.mp4 and c.mp4 have their original audio. After I run the commands above, the joint video abc-cmplt.mp4 has combined audio (audio.mp3 plus their own) for the first (a.mp4) and last parts (c.mp4). However, the middle part only has its own audio and the extra audio I am trying to add does not seem to merge with the audio of b.mp4 in the final joint file.

  


  Output of ffmpeg -i bits/a.mp4 -i wrap/b.mp4 -i bits/c.mp4 :

  


  ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.2.1 (GCC) 20200122
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bits/a.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2021-03-10T08:50:04.000000Z
  Duration: 00:00:01.05, start: 0.000000, bitrate: 1846 kb/s
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1080x1920 [SAR 1:1 DAR 9:16], 1462 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2021-03-10T08:50:04.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      encoder         : AVC Coding
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
    Metadata:
      creation_time   : 2021-03-10T08:50:04.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'wrap/b.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:27.93, start: 0.000000, bitrate: 234 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1080x1920, 231 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'bits/c.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2021-03-10T08:42:52.000000Z
  Duration: 00:00:01.05, start: 0.000000, bitrate: 1829 kb/s
    Stream #2:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1080x1920 [SAR 1:1 DAR 9:16], 1320 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2021-03-10T08:42:52.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      encoder         : AVC Coding
    Stream #2:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
    Metadata:
      creation_time   : 2021-03-10T08:42:52.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler


  


• Mixed Reality WebRTC without Signalling Server

  25 mai 2021, par SilverLife

  I am trying to find a way, which allows me to use Mixed Reality WebRTC (link to git-repo) without a signalling server.
In detail, I want to create a sdp-file from my ffmpeg Video sender and use this sdp-description in my unity-Project to bypass the signaling process and receive the ffmpeg video stream.
Is there a way of doing so with Mixed Reality WebRTC ? I was already searching for the line of code, where the sdp-file is created within MR WebRTC but I didn´t find it.

  


  I am relatively new to this topic and I am not sure if this works at all but since ffmpeg is not directly compatible with webrtc I was thinking that this might be the most promising approach.

  


• Mixed Syntax Windows CMD and FFMPEG Only One File Outputs for Multiple Input

  7 novembre 2022, par James

  My program is reading multiple files into a For In Do loop, the FFMPEG instructions read each file but only output the last read file, and the output file name is always labeled 0001 regardless of how many files were read.

  


  I wrote a simple representative program to solve the problem. It changes the extension name from jpg to jpeg.

  


  Local files to process are :

  


  360_0001.jpg
360_0002.jpg


  


  This is in the local batch file named Loop.bat.

  


  FOR %%G IN (360_*.jpg) DO (
ffmpeg -I %%G -y 360_%%4d.jpeg)

PAUSE


  


  What expected was the writing of to new files locally named :

  


  360_0001.jpeg
360_0002.jpeg


  


  What I get is :

  


  360_0001.jpeg


  


  Which is 360_0002.jpg the last read input file copied and named 360_0001.jpeg.