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• To convert audio file from .wav to .mp3 using ffmpeg flutter

  19 septembre 2022, par Akhil

  I needed to convert an audio file from .wav to .mp3, i have used this package for converting.But its returning with code 1.

  


   FFmpegKit.execute('-i $url output.mp3').then((session) async {
                                                        final returnCode = await session.getReturnCode();

                                                        if (ReturnCode.isSuccess(returnCode)) {


                                                          // SUCCESS

                                                        } else if (ReturnCode.isCancel(returnCode)) {

                                                          // CANCEL

                                                        } else {


                                                          // ERROR

                                                        }
                                                      })


  


  conversion no

  


• FFMPEG : how to change framerate KEEPING the same duration ?

  19 mars 2016, par Camillo Gatto

  please consider C0003.MXF have a framerate different from 25fps

  I have try this :

  ffmpeg.exe -r 25 -i C0003.MXF -vcodec mpeg2video -g 0 -intra -pix_fmt yuv422p -q:v 0 -flags +ildct+ilme -an output25fps.mkv

  I need to change the framerate so that the final framerate is fixed to 25fps but also keep the same duration of the original C0003.MXF file, and the maximum video quality (using frame interpolation ?) plase how can I do ? thanks

• FFMPEG combining many files and filters at once

  7 août 2018, par Vadim

  I need to make 1 video from 5 different pieces (mp4,mp3,png) :

  [0] input.mp4 (120fps 4 sec)

  1 sequence of .png (2 sec and its looped)

  [2] sound.mp3 (3 minutes, but i only need the same time as input.mp4)

  [3] Title1.mp4 (30fps its sets in begining)

  [4] Title2.mp4 (30 fps its sets in the end)

  ---

  I tried to explain in picture below :
  

  Its too hard for me to understand the filtergraph syntex as i thinks my steps must be like this :

  ---

  1. I need slow Input.mp4 to 30 frames "setpts=PTS*10,fps=30"and " boxblur=luma_radius=2:luma_power=1 boxblur=2:1" ill get outMain.mp4 [outMain]
  2. Then i overlay .png and .mp3 there is i have a problem, maybe "overlay=shorters=1" and "-loop 1"
     ill get outMain2.mp4[outMain2]
  3. And the final ill need to Concat it all in order "[3][outMain2][4]concat=n=3 out output.mp4"

  How to make it in one action and add a -ultrafast preset, speed is important for me ?
  Thanks

  I understood how to use filtegraph a bit :
  But it appears another question in comments with looping overlay after slowing video in one action...

  In first i slow video :

  ffmpeg -i input.mp4  -r 24 -vf "setpts=(10/1)*PTS" -c:v libx264 -preset ultrafast -crf 26 -c:a copy output.mp4

  Then Overlay png and add .mp3 :

  ffmpeg -i input.mp4 -i alpha.png -i dorn.mp3 -filter_complex "[0:v][1:v]overlay" -c:v libx264 -preset ultrafast -crf 26 -c:a copy -y -map 2:a -shortest out.mp4

  Add begin title and final title :

  ffmpeg -i input.mp4 -i preroll.mp4 -filter_complex "[1][0][1]concat=n=3" -preset ultrafast -crf 26 -c:a copy output.mp4

  But it freezes with "Buffer queue overflow, dropping" Will try to resolve problem.
  The key to the freeze was simple. If i want to paste [0] video in the begining and in the end i must specify one more "-i" for example :

  ffmpeg -i 0.mp4 -i 1.mp4 -i 0.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]" -map "[v]" -map "[a]" -c:v libx264 -preset ultrafast -crf 26 output_video.mp4