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• Is there any case for a mov and mp4 containers be interchangeable ?

  13 avril 2018, par danielfranca

  The question migh be silly,
  But I got the following situation.

  I have a bunch of MOV video files from some clients, I was going to convert them to MP4 to be able to run on a browser.
  However, when I just tried to open it on the browser it worked fine, both in Firefox and Chrome.

  When I run ffmpeg on one of those files I get fhe following :

  ffmpeg -i MyVideo.mov -hide_banner
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MyVideo.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      creation_time   : 2011-06-27 19:53:07
  
      Duration: 00:10:10.96, start: 0.000000, bitrate: 10234 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720, 10103 kb/s, 25 fps, 25 tbr, 2500 tbn, 5k tbc (default)
  
      Metadata:
  
        creation_time   : 2011-06-27 19:53:07
  
        handler_name    : Apple Alias Data Handler
  
        encoder         : H.264
  
     Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 126 kb/s (default)
  
      Metadata:
  
        creation_time   : 2011-06-27 19:53:07
  
        handler_name    : Apple Alias Data Handler

  When running ffprobe to check the container I get a bunch of outputs :

  [FORMAT]
  
  format_name=mov,mp4,m4a,3gp,3g2,mj2
  
  [/FORMAT]

  What exactly does this means ? All those containers are interchangeable ?
  If not, why browsers are able to read this file ?

  Firefox version : 59.0.2
  Chrome Version 65.0.3325.181

• ffmpeg - How to filter video when record Window Application in the same time

  16 mai 2018, par user3181176

  I have a problem when record Window Application and filter (overlay, audio mixing...) with others filter video.

  This code work perfectly :

  ffmpeg -rtbufsize 1500M -f dshow -i audio="virtual-audio-capturer" -f gdigrab -framerate 30 -draw_mouse 0 -i title="Main" -vf crop=850:480:156:100 -pix_fmt yuv420p -profile:v baseline -y ok.mp4   (With Main is my Application)

  But this code bellow doesn’t :

  ffmpeg  -rtbufsize 1500M -f dshow -y -i audio="virtual-audio-capturer" -f gdigrab -framerate 30 -draw_mouse 0 -i title="Main" -vf crop=850:480:156:100 -pix_fmt yuv420p -profile:v baseline -stream_loop 999 -i "filter/filter.mp4" -filter_complex "[2:v]scale=385:216, setdar=dar=16/9[v1]; [2:v]scale=385:216, setdar=dar=16/9[v2]; [v1][v2]blend=shortest=1:all_opacity=1[v3]; movie=filter/nds_bg.mp4:loop=999,setpts=N/(FRAME_RATE*TB), scale=640:360[v4] ;[v4][v3]overlay=shortest=1:x=20:y=130;[2:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,asetrate=8.5/10*44100,atempo=10/8.5,lowpass=f=2500,highpass=f=400,volume
  
  =3,bass=g=-30,equalizer=f=10.5:width_type=o:width=1:g=-30, equalizer=f=31.5:width_type=o:width=1:g=-
  
  30,equalizer=f=63:width_type=o:width=1:g=-10, equalizer=f=125:width_type=o:width=1:g=-20,equalizer=f=250:width_type=o:width=1:g=-1.5,equalizer=f=500:width_type=o:width=1:g=-20,equalizer=f=1000:width_type=o:width=1:g=-20,equalizer=f=8000:width_type=o:width=3:g=1,equalizer=f=16000:width_type=o:width=3:g=1" -vcodec libx264 -pix_fmt yuv420p -r 26 -g 30 -b:30 
  
  800k -shortest -acodec libmp3lame -b:a 128k -preset:v ultrafast -ar 44100 -f flv -bufsize 3000k -s 640x360 out.mp4

  I think this code need to output to video first

  ffmpeg -rtbufsize 1500M -f dshow -y -i audio="virtual-audio-capturer" -f gdigrab -framerate 30 -draw_mouse 0 -i title="Main" -vf crop=850:480:156:100 -pix_fmt yuv420p -profile:v baseline

  Please show me how to merge these code or any solution. Thank you so much !

• FFmpeg - Multiple videos with 4 areas and different play times

  25 mai 2018, par Robert Smith

  I have videos as follows

  video   time
  
  ======= =========
  
  Area 1:
  
  video1a    0-2000
  
  video1b 2500-3000
  
  video1c 3000-4000
  
  
  
  Area 2:
  
  video2a  300- 400
  
  video2b  800- 900
  
  
  
  Area 3:
  
  video3a  400- 500
  
  video3b  700- 855
  
  
  
  Area 4:
  
  video4a  400- 500
  
  video4b  800- 900

  Basically these are security camera outputs and should display in 4 areas :

  So far I have the following :

  ffmpeg
  
      -i 1.avi -i 2.avi -i 3.avi -i 4.avi
  
      -filter_complex "
  
          nullsrc=size=640x480 [base];
  
          [0:v] setpts=PTS-STARTPTS, scale=320x240 [upperleft];
  
          [1:v] setpts=PTS-STARTPTS, scale=320x240 [upperright];
  
          [2:v] setpts=PTS-STARTPTS, scale=320x240 [lowerleft];
  
          [3:v] setpts=PTS-STARTPTS, scale=320x240 [lowerright];
  
          [base][upperleft] overlay=shortest=1 [tmp1];
  
          [tmp1][upperright] overlay=shortest=1:x=320 [tmp2];
  
          [tmp2][lowerleft] overlay=shortest=1:y=240 [tmp3];
  
          [tmp3][lowerright] overlay=shortest=1:x=320:y=240
  
      "
  
      -c:v libx264 output.mp4

  But there are two things I am missing :

  • The above is only for 4 video files, I need a way to add additional files to each area (for example video1b should play at its corresponding time after video1a in the same area)
  • How do I specify the beginning/ending time as shown above for each file ?