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• FFmpeg - Concatenate all videos with similar file name ?

  24 décembre 2017, par Pan Hart

  Is there any way to use ffmpeg to concatenate all video files that have the exact same file name for the specified first few characters?

  For example, if I set it to match the first 5 characters, it will match and concatenate video_1.flv, video_2.flv, video_3.flv and so on.

  But, at the same time, it can also match and concatenate tests_1.flv, tests_2.flv, tests_3.flv and so on.

  Any help will be appreciated!

• Play video overlay over video not working in ffmpeg

  24 décembre 2017, par Sumit Marwha

  I am trying to play video over another video using ffmpeg. When i am trying to play video from starting then overlay video plays. But if i try to overlay video from n seconds it doesn't work

  ffmpeg -i input.mp4 -i overlay.mp4
  -filter_complex [1:v]scale=920:920[out],[out][0]overlay=0:0:enable='between(t\,4\,8)'[out]
  -map [out] output.mp4
  

  If i change between(t\,4\,8) to between(t\,0\,4) then overlay video works normally. It is not working for between(t\,4\,8). Please help how to solve it

• Concatenate 2 or more gif files with ffmpeg android

  24 décembre 2017, par Chathu_sm

  Well, I have spent a great deal of time to find a way of combine gif files using ffmpeg library.But none of them seems to work for me.

  What I have tried (I have used ffmpeg android java library):

      String gif1=Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)+"/gif1.gif";
      String gif2=Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)+"/gif2.gif";
  
      String commandStr="-i concat:"+gif1+"|"+gif2+" -c copy "+file.getAbsolutePath()+"/output.gif";
  
      String[]command=commandStr.split(" ");
          ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {
  
              @Override
              public void onStart() {}
  
              @Override
              public void onProgress(String message) {
               //   Toast.makeText(Main.this,"Progress: "+message,Toast.LENGTH_SHORT).show();
                  Log.e("Progress TAG: ",message);
              }
  
              @Override
              public void onFailure(String message) {
                  Toast.makeText(Main.this,"Failed: "+message,Toast.LENGTH_SHORT).show();
                  Log.e("Failure TAG: ",message);
              }
  
              @Override
              public void onSuccess(String message)
              {
                  Toast.makeText(Main.this,"Success: "+message,Toast.LENGTH_SHORT).show();
                  Log.e("Success TAG: ",message);
              }
  
              @Override
              public void onFinish() {}
          });
      } catch (FFmpegCommandAlreadyRunningException e) {
          // Handle if FFmpeg is already running
      }
  

  But above command gives an error like this.

  ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
                                                                            built with gcc 4.8 (GCC)
                                                                            configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
                                                                            libavutil      55. 17.103 / 55. 17.103
                                                                            libavcodec     57. 24.102 / 57. 24.102
                                                                            libavformat    57. 25.100 / 57. 25.100
                                                                            libavdevice    57.  0.101 / 57.  0.101
                                                                            libavfilter     6. 31.100 /  6. 31.100
                                                                            libswscale      4.  0.100 /  4.  0.100
                                                                            libswresample   2.  0.101 /  2.  0.101
                                                                            libpostproc    54.  0.100 / 54.  0.100
                                                                          Input #0, gif, from 'concat:/storage/emulated/0/Pictures/gif1.gif|/storage/emulated/0/Pictures/gif2.gif':
                                                                            Duration: N/A, bitrate: N/A
                                                                              Stream #0:0: Video: gif, bgra, 500x500, 1.70 fps, 10 tbr, 100 tbn, 100 tbc
                                                                          Assertion video_enc->pix_fmt == AV_PIX_FMT_PAL8 failed at libavformat/gif.c:130
  

  Can anyone please suggest me an efficient command to do this.

  P.S: I have a dynamic file list so can't use the demuxing method which uses a text file.

• Make VP9 encoding faster with the best possible quality without picture freezing

  24 décembre 2017, par kostya572

  I am using this code to combine 2 files together (overlay file over original file):

  ffmpeg -r 60 \
          -i originalfile.webm -i overlayfile.mov \
          -filter_complex " \
              [0:v]setpts=PTS-STARTPTS[base]; \
              [1:v]setpts=PTS-STARTPTS+0.5/TB, \
                   format=yuva420p,colorchannelmixer=aa=0.7[overlay]; \
               [base][overlay]overlay=x=(W-w)/2:y=0[v]" -map "[v]" -map 0:a -c:a copy -c:v libvpx-vp9 -lossless 1 -threads 4 -quality realtime -speed 8 -tile-columns 6 -frame-parallel 1 -vsync 1 -shortest resultfile.webm
  

  Encoding speed is not bad and quality output also, but after some time video picture could freeze for several seconds, then again it plays ok and then again could freeze.

  How could I optimize this code to make fast speed with the highest possible quality as original file without picture freezing?

  Thank you

• Is there an ffmpeg flag to not ask for overwrite but add a number at the end ?

  23 décembre 2017, par usbpc102

  I have a script that converts ~8000 files to mp3. I have some files that have a sielar name, where just the extension is diffrent, and they would create all the same .mp3 file with my script at the moment.

  So I just want ffmpeg to add something like (x) at the end of the name befor the extension and not ask me every few files.

  Thank you!