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• Merge selected separate video's and put the variable into a ffmpeg merge command

  28 juin 2017, par Fearhunter

  I am using the following method to cut a stream in pieces and save mp4 files on my harddisk.

  Method :

   public Process SliceStream()
  
          {
  
              var url = model.Url;
  
              var cuttime = model.Cuttime;
  
              var output = model.OutputPath;
  
  
  
              return Process.Start(new ProcessStartInfo
  
                  {
  
                      FileName = "ffmpeg.exe",
  
                      Arguments = $"-i \"{url}\" -c copy -flags +global_header -f segment -segment_time \"{cuttime}\" -segment_format_options movflags=+faststart -reset_timestamps 1 \"{output}\"",
  
                      UseShellExecute = false,
  
                      RedirectStandardOutput = true
  
                  }); 
  
  
  
          }

  The var variables are the user’s inputs on the front-end. This method is working fine.

  Now I have the separate video files loaded in a list on the front end. I want to merge this videos files into one. I was looking to the following link :

  Concatenate two mp4 files using ffmpeg

  I see there a 3 ways to merge my seperate video files. What is the best way to merge my video’s ? I was thinking about to this scenario :

  1 : the user select te video’s he wants to merge
  2 : the user click on the button merge
  3 : this array variable I can use into the ffmpeg command in reverse order

  ffmpeg -i '{reversed array input}' -codec copy output

• FFMPEG - Merge multiple video in to one video, the output video has no audio

  26 octobre 2018, par Tan Pham

  My input file has 5 video and 1 picture. I want to merge all video to one video, play video at the same time.
  The layout of the output video like this :
  

  Im using ffmpeg to merge video. this is my ffmpeg command :

  ffmpeg 
  
  -i C:\VID\test1.mp4 
  
  -i C:\VID\test2.mp4 
  
  -i C:\VID\test3.mp4 
  
  -i C:\VID\test4.mp4 
  
  -i C:\VID\test5.mp4 
  
  -i C:\VID\background.jpg 
  
  -filter_complex 
  
  " nullsrc=size=1280x720 [base]; 
  
  [0] setpts=PTS-STARTPTS, scale=560x360 [video0];
  
   [1] setpts=PTS-STARTPTS, scale=280x180 [video1]; 
  
  [2] setpts=PTS-STARTPTS, scale=280x180 [video2];
  
   [3] setpts=PTS-STARTPTS, scale=280x180 [video3];
  
   [4] setpts=PTS-STARTPTS, scale=280x180 [video4]; 
  
  [5:v] scale=700x700 [image]; 
  
  [base][video0] overlay=shortest=1 [tmp1]; 
  
  [tmp1][video1] overlay=shortest=1:y=360 [tmp2];
  
   [tmp2][video2] overlay=shortest=1:x=280:y=360 [tmp3]; 
  
  [tmp3][video3] overlay=shortest=1:y=540 [tmp4]; 
  
  [tmp4][video4] overlay=shortest=1:x=280:y=540 [tmp5];
  
   [tmp5][image] overlay=570:10:enable='between(t,0,30)'"
  
   -t 30 -c:v libx264 output.mkv

  The output video layout is working fine but no audio in the output video.
  I want all audio off each video will be keep on the output video. play audio at the same time together.
  I’m using tutorial on this link : Create a mosaic out of several input videos
  Thanks for reading

• Undefined reference to av_log

  12 novembre 2017, par Dana Prakoso

  I am cross-compiling FFMPEG source in Linux for Windows using i686-w64-mingw32 using this script :

  ../ffmpeg/configure --disable-ffmpeg --disable-ffprobe --disable-ffplay --disable-shared --enable-static --arch=x86 --target-os=mingw32 --cross-prefix=i686-w64-mingw32- --enable-cross-compile

  And it generates all static library files with extension *.a inside "lib" folder. Then I try to link those libraries with my own source, with this script :

  i686-w64-mingw32-gcc -m32 -c videoplayer.c -o videoplayer.o -w $(INCLUDEDIR) -Wl,--add-stdcall-alias
  
  i686-w64-mingw32-gcc -static -m32 -o libvideoplayer.dll videoplayer.o -Wl,--out-implib,libvideoplayer_dll.lib -Wl,--add-stdcall-alias -L../../ffmpeg/lib -lavdevice -lavformat -lavcodec -lavutil -lwsock32 -lswresample ../../ffmpeg/lib/libWs2_32.lib

  And I got this bunch of error messages :

  ../../ffmpeg/lib/libavformat.a(rtpproto.o): In function `rtp_resolve_host':
  
  /home/dana/Sources/build-ffmpeg/src/libavformat/rtpproto.c:140: undefined reference to `_imp__getaddrinfo@16'
  
  ../../ffmpeg/lib/libavformat.a(rtpproto.o): In function `rtp_parse_addr_list':
  
  /home/dana/Sources/build-ffmpeg/src/libavformat/rtpproto.c:282: undefined reference to `_imp__freeaddrinfo@4'
  
  /home/dana/Sources/build-ffmpeg/src/libavformat/rtpproto.c:277: undefined reference to `_imp__freeaddrinfo@4'
  
  ../../ffmpeg/lib/libavformat.a(tcp.o): In function `tcp_open':
  
  /home/dana/Sources/build-ffmpeg/src/libavformat/tcp.c:112: undefined reference to `_imp__getaddrinfo@16'
  
  /home/dana/Sources/build-ffmpeg/src/libavformat/tcp.c:114: undefined reference to `_imp__getaddrinfo@16'
  
  /home/dana/Sources/build-ffmpeg/src/libavformat/tcp.c:177: undefined reference to `_imp__freeaddrinfo@4'
  
  /home/dana/Sources/build-ffmpeg/src/libavformat/tcp.c:192: undefined reference to `_imp__freeaddrinfo@4'

  How do I resolve this ? Do I miss something in my script ? Big thanks for someone replying.