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• Using ffmpeg create an android playable music slide show

  22 avril 2014, par user2637966

  I am now creating a music slide mp4 video and going to play it in android device with ffmpeg.

  I used the following command to accomplish this mission.

  The first one is to inputting a batch of jpg files and convert it to a mp4 file.

  1.)C:/xampp/htdocs/bin/ffmpeg -y -r 1/5 -i C:/xampp/htdocs/bin/%03d.jpg -c:v libx264 -profile:v baseline -level 3.0 -r 30 -pix_fmt yuv420p C:/xampp/htdocs/bin/out.mp4

  The second one is to putting the audio to the previous created video.

  2.)C:/xampp/htdocs/bin/ffmpeg -i C:/xampp/htdocs/bin/out.mp4 -i C:/xampp/htdocs/upload/1.mp3 -y -map 0 -map 1 -codec copy -shortest C:/xampp/htdocs/bin/haha.mp4"

  Both of the command are correct and created the mp4 file. However only out.mp4 can be played in android deivce while haha.mp4 cannot.

  So it seems the audio track violate the android mp4 requirement. What should the second command be so that i can play the mp4 file in android device.

• iOS/Safari MediaRecorder Extremely Big File sizes with FFMPEG Or issue with MediaRecorder

  13 janvier 2021, par Dean Van Greunen

  Having an issue where the output video size of the converted video is 0.

  


  however i believe that the issue is with the mediarecorder code :

  


  recorder = new MediaRecorder(this.stream, { mimeType: "video/webm;codecs=vp9" });
recorder.ondataavailable = async (e) => {
  const payload = e.data;
  let y = blob2base64(payload);
  // take y and transfer to server, (on server decode base64 string and append that to the video file)
}


  


  I have the MediaRecorder API Enabled via the safari and iOS settings.

  


  for example after processing and saving the data chunks for the video that has been captured. Weird is that the video is blank but when using ffprobe, all the info is correct. so i'm stuffed.

  


  Here is the Captured Video (Before conversion)

  


  after conversion, the new file is 0 bytes big

  


  Note :
this works fine on windows and linux.
issue is only with iOS or MacOS

  


  Not sure what i am doing long.

  


• ffmpeg concat two videos with different sizes encounter "do not match" error

  1er juillet 2019, par baojieqh

  I’m trying to concat 4 mp4 files. I’m using the command below but not able to concat

  ffmpeg -i L00.mp4 -i L01.mp4 \
  
    -filter_complex "[0:v] [0:a] [1:v] [1:a] concat=n=2:v=1:a=1 [v] [a]" \
  
    -map "[v]" -map "[a]" output.mp4

  Getting this error :

  Input link in1:v0 parameters (size 1150x722, SAR 1:1) do not match the corresponding output link in0:v0 parameters (1158x690, SAR 1:1)

  This command from this post

  ffmpeg -i L00.mp4 -i L01.mp4 -filter_complex \
  
  "[0:v]scale=1158:722:force_original_aspect_ratio=decrease,pad=1158:722:(ow-iw)/2:(oh-ih)/2[v0]; \
  
   [1:v]scale=1158:722:force_original_aspect_ratio=decrease,pad=1158:722:(ow-iw)/2:(oh-ih)/2[v1]; \
  
   [v0][0:a][1:v][1:a]concat=n=2:v=1:a=1[v][a]" \
  
  -map "[v]" -map "[a]" -c:v libx264 -c:a aac -movflags +faststart output.mp4

  getting this error :

  Filter pad has an unconnected output

  the dimensions of L00.mp4 is 1158 × 690, L01.mp4 is 1150 × 722.

  how to fix this ?