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• Illegal instruction : 4 in ffmpeg

  3 mars 2015, par rs41

  I tried brew installed ffmpeg, i am also tried to compile ffmpeg but in all cases i have the error

  Illegal instruction : 4

  I run something like this :

  ./ffmpeg -i /Users/ruslan/Torrents/Weird\ smiling\ dog.3gp -codec:v libx264 -b:v 360k -maxrate 360k -bufsize 720k -movflags +faststart -vprofile high -preset slow -vf 'scale=trunc(iw/2)*2:360' -threads 0 -codec:a libfdk_aac -b:a 96k -ac 2 -f mp4 -threads 0 -y /dev/null >> /Users/ruslan/erosite/log/ffmpeg_convertation.log 2>&1
  
  Illegal instruction: 4

  Or only ffmpeg with options when used homebrews installed version

  Additional info :

  OS X Yosemite 10.10.2

  MacBook Pro (15-inch, Mid 2009)

• Why is ffmpeg creating extra files ?

  11 mai 2020, par Christian

  I'm trying to convert files from url with ffmpeg, and most of the time, I get exactly what I'm looking for :

  



  $video = "tmpVideos/".$img->image_id.$randNum.".mov";
$largeURL = uniqid();
$command = "ffmpeg -i $video -filter:v scale=720:-2:force_original_aspect_ratio=decrease -c:v libx264 -x264-params crf=23 -an large/$largeURL.mp4";
shell_exec($command);


  



  But when the input file is larger than about 2GB, weird things start to happen. Most of the time, it just makes extra files. The file I asked for will be created, and then several more (sometimes 1, sometimes 3) will be made with the same resolution, but with slightly (about 20%) larger filesizes.

  



  Why does this happen ? Is there any way to kill ffmpeg when the file I want is created ?

  


• how to read partial fragmented mp4 from buffer or stdin

  1er mars 2023, par poush

  I am facing a weird challenge. I am still wondering if there's something wrong in my understanding of fragmented mp4 concepts.

  


  I have a buffer stream of a video file, that I am streaming from AWS. Subsequently I am passing it to stdin and using ffmpeg to encode it.

  


  What I want to achieve is if I skip 10000 initial bytes (say) from the source (which is S3 here), I still want to be able to encode the rest of the video in the buffer.

  


  I tried to create a fragmented mp4 (10s) and split the file into chunks of 20MB and now if I try to play any of the chunks except the first one, it doesn't work. I am trying to understand how HLS or Dash uses fragments to jump directly to a part of the video.

  


  I want to mimic basically the HLS player behaviour. Say, if I want to start streaming from S3 bucket from 200000 bytes, then I want to be able encode the video from there.