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• How to replace the video track of a part of a video file ?

  17 juin 2019, par yukashima huksay

  I have an mp4 file like this(same format but longer) :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'N1.2.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2018-10-31T13:44:21.000000Z
  
    Duration: 00:28:54.21, start: 0.000000, bitrate: 10295 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 9972 kb/s, 50 fps, 50 tbr, 50k tbn, 100 tbc (default)
  
      Metadata:
  
        creation_time   : 2018-10-31T13:44:21.000000Z
  
        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   : 2018-10-31T13:44:21.000000Z
  
        handler_name    : #Mainconcept MP4 Sound Media Handler

  I also have another video file that is 3 minutes long. and has no audio. What is the fastest way to encode the other video in a way that it is encoded like my main video and then replace the last three minutes of the video track of my original video with this ?

  In other words.
  I have video A that is 1 hour long. With the encoding shown above.

  I have video B that is 3 minutes long with no audio. with a random encoding.

  I want to have video C with the same encoding and same audio as A. But it’s video track would be the first 57 minutes of A + B(which is 3 minutes).

  I want to do this as fast as possible so I would like to not re encode A.

  I know how to concatenate two videos, I use this command :

  ffmpeg -f concat -i files.txt -c copy res.mp4

• Video file is hanging after concatenating video files and drawtext to output

  12 avril 2019, par elzix88

  I’m trying to concat 3 video files and add text to output using ffmpeg.
  Each part is 10 sec long.

  I’ve end up with this code :

  ffmpeg -i output3.mp4 -i output2.mp4 -i output1.mp4 -filter_complex "[0:v:0][0:a:0][1:v:0][1:a:0][2:v:0][2:a:0]concat=n=3:v=1:a=1[v][a]; [0:v:0]drawtext=fontfile=tahoma.ttf:text=Sample text:fontcolor=white:fontsize=40:box=1:boxcolor=black@0.7:boxborderw=5:x=100:y=100" -map "[v]" -map "[a]" output.mp4

  The result video has 30 seconds but it hangs after 1st part (10s). When I remove drawtext filter part (just concat), then video is fine, but without text...
  Anyone can help ?

• How to extract a video segment from a video using FFMPEG ?

  7 février 2013, par Wajih

  I am a newbie to FFMPEG, I am stuck at using FFMPEG to extract a segment of video. Since I am using the direct command line interface.
  What would be the command line arguments if I am to extract say, video from frame 0 to frame 100000 or if I wanted to extract a video segment of 1 hour from a video that is 5 hours long ?

  Thanks !