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

  21 juillet 2020, 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 zoompan for continuous zoom in/zoom out from start duration

  10 juillet 2020, par Nikhil Solanki

  I am creating continues zoomin/zoomout effect for input image using this command :

  


  ffmpeg -i combine.mp4 -i image1.jpg -filter_complex "[0]split=2[color][alpha]; 
[color]crop=iw/2:ih:0:0[color]; [alpha]crop=iw/2:ih:iw/2:ih[alpha]; [colo][alpha]alphamerge[v1];
[1]scale=540*2:960*2, setsar=1, zoompan=z='if(lte(zoom,1.0),1.02,max(1.001,zoom-0.0015))':d=25*0.25:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':s=540x960[v2]; 
[v2]zoompan=z='if(gte(zoom,1.1),1.0,min(zoom+0.0015,1.1))':d=25*0.25:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':s=540x960[v2];
[v2]curves=vintage, format=yuv444p[v2];
[v2][v1] overlay=1" output_video.mp4 -y


  


  This command will continues zoomin and zoomout input image1.jpg for 1 second and stop after 1 second its OK. But problem is I want perform zoomin zoomout effect after 5 second of video. Video duration is 20s. So, how can I perform zoompan after some duration.

  


• FFMPEG - can you have comments in script files ?

  25 mai, par rossmcm

  Because of batch's poor ability to handle multi-line strings, I'm using FFMPEG script files more and more for filter_complex arguments. I'm wondering if there is any way to include comments in these files. They seem to be quite tolerant of white space and line breaks. I've tried :

  


  #
#   comment
#


  


  and

  


  ;
;   comment
;


  


  and

  


  `
`   comment
`


  


  and

  


  '
'   comment
'


  


  with no success. It doesn't look as if comments are officially supported, but I'm wondering of there is some syntax quirk that allows them ?

  


  *** CLARIFICATION ***

  


  I'm not talking about comments in batch files here, but comments in filter_complex_script files. FFMPEG supports specifying the filter_complex argument string in a separate file. So instead of :

  


  ffmpeg -i "input.mp4" -filter_complex "[0:v] crop=w=100:h=100:x=12:y=34 " "output.mp4"


  


  you can specify :

  


  ffmpeg -i "input.mp4" -filter_complex_script "crop.txt" "output.mp4"


  


  where crop.txt contains

  


  [0:v] crop=w=100:h=100:x=12:y=34


  


  This is really handy when the filter_complex string gets more complicated (I routinely deal with arguments 10,000 characters in length).