Recherche avancée

Sur d’autres sites (10861)

• How to change mp4 aspect ratio to 16:9 using ffmpeg ?

  20 février 2023, par user1788736

  I got an mp4 video that I copy 4 minute of it using ffmpeg. After uploading to YouTube I noticed the uploaded video has black bars on both side of video(right and left side) !After searching for a way to remove those black bars I found that I need to use yt:stretch=16:9 !However,using yt:stretch=16.9 tag will not remove the black bars on iPhone and Samsung smart tv YouTube app !

  



  could an expert help me change the aspect ratio of original mp4 video to 16:9 using ffmpeg (without losing video quality) for re uploading to YouTube ? Thanks in advance ?

  



  I got two types of source with following information :

  



  1)Resolution:720x576 ,Frame rate:25 . Codec:H264 - MPEG-4 AVC(part 10)(avc1),
2)Resolution:848x480 , Frame rate:24.804393,Codec:H264 - MPEG-4 AVC(part 10)(avc1)


  



  ffmpeg code used to trim the original video :

  



     ffmpeg -i orginalVideo.mp4 -ss 00:25:55 -t 00:04:02 -acodec copy -vcodec copy videoForYoutube.mp4


  


• FFmpeg 16:9 Aspect ratio

  29 mai 2020, par Satish Kumar

  Find the Image attachedI have a video of resolution 1920 x 1080, but it is cropped with black in all sides. I found the crop values as 1440:720:240:208.

  



  But when i apply crop with (1440:720:240:208.), the output video loses some portion of videos along the four sides, which is actually present in original input video.

  



  I want to remove only the black border on all sides, but the output video should cover the 16:9 aspect ratio without losing the actual play area as in input (original) video

  



  pl let provide the ffmpeg syntax for the same.

  


• Running a FFMPEG in background not working (it stops after less than 1 second)

  19 mars 2021, par Jintor

  I'm trying to start a ffmpeg but in background because it's in a php triggered by a webhook event.

  


  Scenario :
1- a user start a chat session
2- the user hit a button to stream
3- the server that runs coturn (webrtc server) does a webhook event
4- the server that receives the webhook then enter some values in a database and have the ffmpeg

  


  in this actual scenario : all is working except ffmpeg... the values is entered in mysql

  


  I tried to run ffmpeg in background with nohup or php > /dev/null & like those lines

  


  exec('/usr/bin/nohup /usr/local/bin/php path-to-.php > /dev/null 2>&1 &');

exec('/usr/local/bin/php '.$ffmpeg_cmd." > /dev/null &");

exec('/usr/bin/nohup /usr/local/bin/php '.$ffmpeg_cmd." > /dev/null &");


  


  also added

  


  ignore_user_abort(1);
set_time_limit(0);


  


  Everything I try, it stops after 1 second :( but the ffmpeg have -re attribute to read at input framerate in order to stream live.

  


  when I run the ffmpeg command in a regular shell, all is working fine.

  


  Is there an other way to run a ffmpeg in background ?