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• How to use ffmpeg to overlay waveforms on xstack mosaics and specify specific audio for playback

  1er mai 2022, par kellib

  I would like to make a mosaic of multiple titled streams, 1) specifying which of the audio streams to play and 2) overlay waveforms at the bottom of each of the video tiles for the audio that they belong to.

  


  I'm successfully able to create the titled mosaic of streams with the code below.

  


  However :

  


  

  1. I'm having a hard time figuring out how to specify just one of the specific audio sources. I found amix, but I don't really want to mix them, I just want to specify audio [a0], or [a1], or [a2], etc.

  


  


  and

  


  

  2. I'm having a hard time figuring out how to overlay the wave forms at the bottom of the video for each of the tiles. I struggled trying to figure out putting showwaves into the mix. Is it possible ?

  


  


  I want each tile to look like this, but since these are rtmp streams, they need to play-out the matching waveforms dynamically with each stream. https://dragonquest64.blogspot.com/2020/01/ffmpeg-audio-waveform.html

  


  If someone could point me in the right direction, that would be great. I'm getting close, but I'm pretty new to all of this, and have already spent way more time than I should have, so would love a little help.

  


  ffmpeg \
-i rtmp://my.cdn.com/srcEncoders/STREAM-1 \
-i rtmp://my.cdn.com/srcEncoders/STREAM-2 \
-i rtmp://my.cdn.com/srcEncoders/STREAM-3 \
-i rtmp://my.cdn.com/srcEncoders/STREAM-4 \
  -filter_complex " \
      [0:v] setpts=PTS-STARTPTS, scale=qvga \
    , drawtext=text=STREAM-1:fontsize=20:x=10:y=10:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5 [a0]; \
      [1:v] setpts=PTS-STARTPTS, scale=qvga \
    , drawtext=text=STREAM-2:fontsize=20:x=10:y=10:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5 [a1]; \
      [2:v] setpts=PTS-STARTPTS, scale=qvga \
    , drawtext=text=STREAM-3:fontsize=20:x=10:y=10:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5 [a2]; \
      [3:v] setpts=PTS-STARTPTS, scale=qvga \ 
    , drawtext=text=STREAM-4:fontsize=20:x=10:y=10:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5 [a3]; \
      [a0][a1][a2][a3]xstack=inputs=4:layout=0_0|0_h0|w0_0|w0_h0[out]; \
    amix=inputs=1
      " \
  -map "[out]" \
 -c:v libx264 -b:v 1000k -g 30 -keyint_min 120 -profile:v baseline -preset veryfast -f mpegts "udp://127.0.0.1:1234?pkt_size=1316"


  


• Add Padding to video

  26 juin 2023, par Akari

  I have a video which size is 576 x 1024, my screen phone is 576 x 2044. I want to make the height of video is 2044 (full screen) and add padding black background both top and bottom. What can I do ? I currently use FFmpeg library.

  


  I want to process video in android kotlin, and I use some commands but it it doesn't work.

  


  Example :

  


  fun makeVideoFullScreen(
    context: Context,
    inputVideoPath: String,
    screenWidth: Int,
    screenHeight: Int,
    listener : (outputPath: String, returnCode: Int) -> Unit
){
    val fileName = Utility.getCurrentTime()
    val externalDir = context.getExternalFilesDir(null)
    val file = File(externalDir, "temp_video${fileName}.mp4")
    val outputPath = file.absolutePath

    val cmd = arrayOf(
        "-i", inputVideoPath,
        "-vf", "scale=-1:$screenHeight, pad=$screenWidth:$screenHeight:(ow-iw)/2:(oh-ih)/2:black",
        "-c:v", "libx264",
        "-preset", "ultrafast",
        "-c:a", "copy",
        outputPath
    )

    FFmpeg.executeAsync(cmd
    ) { _, returnCode ->
        listener(outputPath, returnCode)
    }
}


  


• FFMPEG How to trim last 2 seconds of multiple files ?

  28 août 2022, par user10784270

  I have over 200 video clips each exactly 5 seconds long, however, the last 2 seconds of each are just a black screen so I want to have this trimmed out. How would I do this ?