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• ffmpeg Muxing Recovered Files - Audio dropping

  7 avril 2020, par Chris McL

  A few years ago, we accidentally deleted all our home movies. We recovered the files from the camera. They have lost their headers and are not playable. I have used a recovery program (recover_mp4) to get an h264 and aac file.

  



  When I try to mux these together, the audio drops off from the stream. It also crackles badly at times. If I play the AAC file by itself, it sounds fine. For some movies, the audio works for a while, on others it drops out quickly.

  



  One thing I noticed is that the resulting muxed mp4 file is often shorter than the audio.

  



  I've tried various ffmpeg commands that look generally like this :

  



  ffmpeg -r 30000/1001 -i recovered_video.h264 -i recovered_audio -bsf:a aac_adtstoasc -c:v copy -c:a copy output.mp4

  



  Any ideas on how to marry the two files together ?

  


• How to convert images to a video by the time they have been taken/saved and not by name ?

  26 avril 2019, par Xester Menia

  I have a Livestream that takes pictures every one or two seconds. Then I have a folder in which the pictures are being saved.
  Usually I would just simply take ffmpeg -start_number -i IMG_%d.JPG video.webm (I need the end format in .webm). I want to use the saved pictures to form a time-lapse to put up next to the stream. So people can see the last 24h/ 7d and 90d. So I wondered if I could code that all the pics of that time period are used and only them.
  I later want it to happen automatic, so i dont have to write the code new every day.

  Thanks for your help

• Java : How to merge and cut H.264 mp4 files with ffmpeg

  15 novembre 2016, par Nico

  I wrote an java application to handle my GoPro video data. Recording for a couple of hours the GoPro produces several chapters (mp4-files). Now the program is able to cut out a sequence no matter if it is in just one chapter or it touches more. I execute the outstanding tool ffmpeg.exe with the Processbuilder.
  First the program exports the mp4-files to *.ts-files and then it merges it togehter to one only mp4-file. At least a sequence will be cut out of this merged mp4-file using ffmpeg.exe for the second time. It works quite reliable and quickly.

  But : I do not have one application in its entirely, but also I have two files (jar-Application and ffmpeg.exe). I think there is are java-libraries of ffmpeg but I do not know how to include and how to use them. I am just searching for a one-file-solution.

  Do you know which library I need and where I can download it ? How may I have to use it ? If that is not possible, do you know some other user-friendly libraries doing the same job with less lines of code ? How to use them ?

  I am very grateful about your help and the examples you will give !