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• How to Merge Multiple video files with different resolution, make padding for the low resolution video in android FFMPEG

  12 février 2021, par Osama aman

  I want to merge multiple videos with different resolutions. if the resolution is low than any other video, it should make a black padding around the low resolution video.

  


  I tried this command

  


      var highestVideoWidth: Int = 0&#xA;    var highestVideoHeight: Int = 0&#xA;&#xA;    val mlisst: MutableList<string> = ArrayList()&#xA;    mlisst.clear()&#xA;    mlisst.add("-i")&#xA;    for (i in trimmedPaths.indices) {&#xA;        if (highestVideoWidth &lt; editedVideosList[i].videoWidth &amp;&amp; highestVideoHeight &lt; editedVideosList[i].videoHeight) {&#xA;            highestVideoWidth = editedVideosList[i].videoWidth&#xA;            highestVideoHeight = editedVideosList[i].videoHeight&#xA;        }&#xA;&#xA;        mlisst.add(trimmedPaths[i])&#xA;        if (i &lt; trimmedPaths.size - 1)&#xA;            mlisst.add("-i")&#xA;    }&#xA;    mlisst.add("-filter_complex")&#xA;    val fc = StringBuilder()&#xA;&#xA;    for (i in trimmedPaths.indices) {&#xA;&#xA;        if (editedVideosList[i].videoWidth == highestVideoWidth &amp;&amp; editedVideosList[i].videoHeight == highestVideoHeight){&#xA;            fc.append("[$i:v]scale=${editedVideosList[i].videoWidth}x${editedVideosList[i].videoHeight},setsar=1:1[v$i];")&#xA;        }else{&#xA;            fc.append("[$i:v]scale=iw*min($highestVideoWidth/iw,${highestVideoHeight}/ih):ih*min(${highestVideoWidth}/iw,${highestVideoHeight}/ih),")&#xA;            fc.append("pad=${highestVideoWidth}:${highestVideoHeight}")&#xA;            fc.append(":(${highestVideoWidth}-iw*min(${highestVideoWidth}/iw,${highestVideoHeight}/ih))/2")&#xA;            fc.append(":(${highestVideoHeight}-ih*min(${highestVideoWidth}/iw,${highestVideoHeight}/ih))/2,setsar1:1[v$i];")&#xA;        }&#xA;    }&#xA;&#xA;    for (i in trimmedPaths.indices) {&#xA;        fc.append("[v$i][$i:a]")&#xA;    }&#xA;    fc.append("concat=unsafe=1:n=${trimmedPaths.size}:v=1:a=1")&#xA;    mlisst.add(fc.toString())&#xA;    mlisst.add("-r")&#xA;    mlisst.add("50")&#xA;    mlisst.add("-preset")&#xA;    mlisst.add("ultrafast")&#xA;    mlisst.add(finalMergedVideoPath)&#xA;</string>

  


  but this gives me this error

  


  Invalid size 'iw*min(1074/iw'
I found the command some where i modified it to my use but now i am not sure. Here is the command : complexCommand = new String[]{"-y", "-i", file1.toString(), "-i", file2.toString(), "-strict", "experimental", "-filter_complex","[0:v]scale=1920x1080,setsar=1:1[v0];[1:v] scale=iw*min(1920/iw\\,1080/ih):ih*min(1920/iw\\,1080/ih), pad=1920:1080:(1920-iw*min(1920/iw\\,1080/ih))/2:(1080-ih*min(1920/iw\\,1080/ih))/2,setsar=1:1[v1];[v0][0:a][v1][1:a] concat=n=2:v=1:a=1","-ab", "48000", "-ac", "2", "-ar", "22050", "-s", "1920x1080", "-vcodec", "libx264","-crf","27","-q","4","-preset", "ultrafast", rootPath + "/output.mp4"};

  


  If anyone can help thanks in advance.
Here is the link to the question i followed

  


• FFmpeg : Batch convert all audio (mp3) in folder to video (mp4) with album artwork (but it down scales my resolution)

  9 février 2021, par unknownman

  I followed this source (FFmpeg : Batch convert all audio (mp3) in folder to video (mp4) with album artwork) and it works, but it down scales my album cover from 1425 x 1406 dimension to 400 x 396.

  


  My Batch code is

  


  echo off
for %%a in ("*.mp3") do (
  ffmpeg -i "%%a" -an -vcodec copy "C:\mp4\%%~na.jpg"
  "C:\ffmpeg\bin\ffmpeg" -loop 1 -i  "C:\mp4\%%~na.jpg" -i "%%a" -c:v libx264 -vf pad="width=ceil(iw/2)*2:height=ceil(ih/2)*2" -preset veryslow -tune stillimage -crf 18 -pix_fmt yuv420p -c:a aac -shortest -strict experimental -b:a 192k -shortest "C:\mp4\%%~na.mp4" )
pause


  


  Problem is I don't know how to fix "down scaling" thing, and I am sorry for stupid questions but I need to know it. I watched other errors or tried to understand codes from others but I am not doing it well.

  


• avutils/vulkan : hwmap, respect src frame resolution

  21 janvier 2021, par Xu Guangxin

  avutils/vulkan : hwmap, respect src frame resolution
  fixes http://trac.ffmpeg.org/ticket/9055
  The hw decoder may allocate a large frame from AVHWFramesContext, and adjust width and height based on bitstream.
  
  We need to use resolution from src frame instead of AVHWFramesContext.
  test command :
  
  ffmpeg -loglevel debug -hide_banner -hwaccel vaapi -init_hw_device vaapi=va :/dev/dri/renderD128 -hwaccel_device va -hwaccel_output_format vaapi -init_hw_device vulkan=vulk -filter_hw_device vulk -i 1920x1080.264 -c:v libx264 -r:v 30 -profile:v high -preset veryfast -vf "hwmap,chromaber_vulkan=0:0,hwdownload,format=nv12" -map 0 -y vaapiouts.mkv
  expected :
  
  No green bar at bottom.
  

  • [DH] libavutil/hwcontext_vulkan.c