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• looping a ffmpeg command that joins two files

  27 octobre 2020, par user3428634

  Command ffmpeg -i file-1.mp4 -vf ass=file-1a.ass burned-1.mp4

  


  works to burn file-1a.ass subtitles on file-1.mp4 video.

  


  But each time I have to reiterate the same command on over 40 different videos and subtitles and each time I have to wait for rendering the output.

  


  So perhaps there is a way to automatically reiterate the same command on all the files.

  


  Looking for a reply found the loop command
for f in *; do ffmpeg $f;

  


  But I am confused how to use it with 2 files, the .mp4 and the .ass file, and also the output file which should have the same number

  


  I imagine should put the same name on each couple of files, such as :
1.mp4 1.ass
2.mp4 2.ass
3.mp4 3.ass
etc

  


  and then
for f in *; do ffmpeg -i $f.mp4 -vf ass=$f.ass $f-output.mp4

  


  But I have no clear idea

  


• Mobile Camera live audio/video streaming and encoding

  7 juin 2015, par Strikecounter2

  I know this question has been asked a couple of times, but I still haven’t found the right answer for my question.

  I would like to code an app that is able to live-stream audio and video while the content is being recorded and then uploaded to a server. I’d prefer to have my own back-end using Parse, because I want a high scalability. I know that the video has to be encoded to a h.264 codec and the audio to an AAC codec, but I don’t know how to achieve this. I have heard of the FFmpeg framework, but I am not sure if I would violate their license if I distribute my app or even sell it to somebody else.
  I would then like to receive the stream from the server to open it on the iPhone/android phone.

  They key requirements would be :

  • Low Latency
  • About 24 fps
  • Audio/Video in sync
  • No buffering while watching

  I would like to use Swift as a programming language, but if there is no way to use a swift-wrapper for any frameworks I would focus on Objective-C too.

  I am willing to learn everything that is needed, but I don’t know where to start.

• 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 !