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• ffmpeg - Incompatible sample format '(null)'

  17 juin 2012, par abrahab

  I convert videos from different sources with ffmpeg to mp4 with libx264 codec. After conversation time to time I got incorrect format error when trying to load already converted video with ffmpeg : Incompatible sample format '(null)' for codec 'aac', auto-selecting format 's16'

  Seems, it is audio stream problem with aac codec ? How to fix or how to convert videos to mp4 to be sure that I will not get the following error ? Maybe somehow need to specify audio format at the ffmpeg convert command ?

  ps. Video must work at Iphone/Ipad.
  pps. the main problem, that such videos with the following error can not be pseudo-streamed with nginx (got 500 Error)
  ppps. and sorry for my bad english, please, correct my text if need. thanks.

  Some additional info from file :

    Duration: 00:00:10.30, start: 0.000000, bitrate: 614 kb/s
  
      Stream #0.0(rus): Video: h264 (High), yuv420p, 1024x576, 567 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
      Stream #0.1(rus): Audio: aac, 22050 Hz, stereo, s16, 57 kb/s
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00

• how to encode mp4 for wowza streaming ?

  29 août 2014, par lng0415

  i want to encode to mp4(h.264 codec) from avi,mpg..... for wowza streaming.

  encode mp4 using ffmpeg, jave.

  encode is success, but wowza streaming is not work on android and iphone OS.
  (it’s play successfully on my PC)

  please help me.

  thank you.

  ps. i’m sorry. i’m poor at english.

  [using jave]

  File source = new File("D://temp/20140704_163504.mp4");
  
  File target = new File("D://temp/jave.mp4");
  
  
  
  AudioAttributes audio = new AudioAttributes();
  
  audio.setCodec("libmp3lame");
  
  audio.setBitRate(new Integer(64000));
  
  audio.setChannels(new Integer(1));
  
  audio.setSamplingRate(new Integer(22050));
  
  
  
  VideoAttributes video = new VideoAttributes();
  
  video.setCodec("h263");
  
  video.setBitRate(new Integer(320000));
  
  video.setFrameRate(new Integer(15));
  
  video.setSize(new VideoSize(400, 300));
  
  
  
  EncodingAttributes attrs = new EncodingAttributes();
  
  attrs.setFormat("mp4");
  
  attrs.setAudioAttributes(audio);
  
  attrs.setVideoAttributes(video);
  
  Encoder encoder = new Encoder();
  
  encoder.encode(source, target, attrs);

• 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