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• FFMpeg - Merge multiple rtmp stream inputs to a single rtmp output

  5 septembre 2013, par Paulo Miguel Almeida

  I'm trying to combine/merge two rtmp streams and then publish 'em to another stream

  Ex. :

  ffmpeg -i rtmp://ip:1935/live/micMyStream7 -i rtmp://ip:1935/live/MyStream7  -strict -2  -f flv rtmp://ip:1935/live/bcove7

  The scenario is the following, I got a stream which comes from an user's microphone that
  is the first one (micMyStream7) and I also got a stream from another user but this one has audio and video(MyStream7).

  As they are talking to each other when a user is speaking, the other one would only be listening to and vice versa.

  My idea is to set up a third stream called (bcove) which would "merge" both of them so that I could have spectators who would only be listening to the entire conversation between them.

  This is the log that ffmpeg printed although I couldn't recognize any message which helped me out.

  paulo@paulo-desktop:~$ ffmpeg -re -i rtmp://ip:1935/live/micMyStream7 -i rtmp://ip:1935/live/MyStream7  -strict -2  -f flv rtmp://ip:1935/live/bcove7
  
  ffmpeg version N-56029-g2ffead9 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Sep  4 2013 11:05:57 with gcc 4.7 (Ubuntu/Linaro 4.7.3-1ubuntu1)
  
    configuration: 
  
    libavutil      52. 43.100 / 52. 43.100
  
    libavcodec     55. 31.100 / 55. 31.100
  
    libavformat    55. 16.100 / 55. 16.100
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 83.102 /  3. 83.102
  
    libswscale      2.  5.100 /  2.  5.100
  
    libswresample   0. 17.103 /  0. 17.103
  
  Input #0, flv, from 'rtmp://ip:1935/live/micMyStream7':
  
    Metadata:
  
      author          : 
  
      copyright       : 
  
      description     : 
  
      keywords        : 
  
      rating          : 
  
      title           : 
  
      presetname      : Medium Bandwidth (300 Kbps) - VP6
  
      creationdate    : Wed Sep  4 16:41:52 2013
  
                      : 
  
      videodevice     : Built-in iSight
  
      videokeyframe_frequency: 5
  
      audiodevice     : External microphone
  
      audiochannels   : 1
  
      audioinputvolume: 75
  
    Duration: N/A, start: 0.000000, bitrate: 253 kb/s
  
      Stream #0:0: Video: vp6f, yuv420p, 320x240, 204 kb/s, 44.83 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: mp3, 22050 Hz, mono, s16p, 49 kb/s
  
  Input #1, flv, from 'rtmp://ip:1935/live/MyStream7':
  
    Metadata:
  
      author          : 
  
      copyright       : 
  
      description     : 
  
      keywords        : 
  
      rating          : 
  
      title           : 
  
      presetname      : Custom
  
      creationdate    : Wed Sep  4 12:02:24 2013
  
                      : 
  
      videodevice     : FaceTime HD Camera (Built-in)
  
      videokeyframe_frequency: 5
  
      audiodevice     : Internal microphone
  
      audiochannels   : 1
  
      audioinputvolume: 75
  
    Duration: N/A, start: 0.000000, bitrate: 253 kb/s
  
      Stream #1:0: Video: vp6f, yuv420p, 320x240, 204 kb/s, 45.08 tbr, 1k tbn, 1k tbc
  
      Stream #1:1: Audio: mp3, 22050 Hz, mono, s16p, 49 kb/s
  
  Output #0, flv, to 'rtmp://ip:1935/live/bcove7':
  
    Metadata:
  
      author          : 
  
      copyright       : 
  
      description     : 
  
      keywords        : 
  
      rating          : 
  
      title           : 
  
      presetname      : Medium Bandwidth (300 Kbps) - VP6
  
      creationdate    : Wed Sep  4 16:41:52 2013
  
                      : 
  
      videodevice     : Built-in iSight
  
      videokeyframe_frequency: 5
  
      audiodevice     : External microphone
  
      audiochannels   : 1
  
      audioinputvolume: 75
  
      encoder         : Lavf55.16.100
  
      Stream #0:0: Video: flv1 (flv) ([2][0][0][0] / 0x0002), yuv420p, 320x240, q=2-31, 200 kb/s, 1k tbn, 44.83 tbc
  
      Stream #0:1: Audio: adpcm_swf ([1][0][0][0] / 0x0001), 22050 Hz, mono, s16, 88 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (vp6f -> flv)
  
    Stream #0:1 -> #0:1 (mp3 -> adpcm_swf)
  
  Press [q] to stop, [?] for help
  
  [mp3 @ 0x3625ec0] overread, skip -9 enddists: -3 -300:14.44 bitrate= 224.0kbits/s    
  
  [mp3 @ 0x3625ec0] overread, skip -7 enddists: -3 -30:26.39 bitrate= 203.5kbits/s  

  Thanks in advance

• ffmpeg trim and fade audio in single command line

  27 février 2015, par Chandra Nakka

  How can i crop and fade out audio with ffmpeg at single command line.

  I’m using this command line :

  ffmpeg -i input.mp3 -y -af "atrim=start=10,afade=t=in:ss=0:d=15" output.mp3

  It just crop audio file. But I can’t get fade out effect.

  How to solve this problem ?

• How can I merge all the videos in a folder to make a single video file using FFMPEG

  10 juin 2016, par X_1

  I have a folder with 20+ video files and I need to merge them to make one long video file. How can I achieve this using FFMPEG in Python ?

  I know the following command

  ffmpeg -vcodec copy -isync -i \ "concat:file1.mp4|file2.mp4|...|fileN.mp4" \

  outputfile.mp4

  But I’d rather not type all the names of the 20+ files.