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• Encode iOS compatible h264 audio stream with FFMPEG

  11 octobre 2014, par beamformer

  I am using FFMPEG with Python to encode a low bit rate version of videos that I import. I would like the output to be playable on several devices, including Roku and iOS. This link states that Apple supports H264 High profile, level 4.1 and MP3 audio.

  ffmpeg -preset veryslow -y -profile:v high -level 4.0 -movflags +faststart -codec:a libmp3lame -qscale:a 2 -s 1280x720 out.mp4

  The resulting videos play fine in an HTML5 browser on a computer. However, on the iPhone the video appears but the audio stream does not play. Is there an issue with the mp3 settings ?

  From ffprobe :

  [STREAM]
  
  index=1
  
  codec_name=mp3
  
  codec_long_name=MP3 (MPEG audio layer 3)
  
  profile=unknown
  
  codec_type=audio
  
  codec_time_base=1/44100
  
  codec_tag_string=mp4a
  
  codec_tag=0x6134706d
  
  sample_fmt=s16p
  
  sample_rate=44100
  
  channels=1
  
  channel_layout=mono
  
  bits_per_sample=0
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/44100
  
  start_pts=-1105
  
  start_time=-0.025057
  
  duration_ts=2321489
  
  duration=52.641474
  
  bit_rate=94949
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=N/A
  
  nb_frames=2016
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=1
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  TAG:language=und
  
  TAG:handler_name=SoundHandler
  
  [/STREAM]

  I tried using AAC, but did not get good results with the native FFMPEG encoder

• ffmpeg convert any user video file to run on mobiles h264 mp4

  24 octobre 2014, par tobros91

  So, i have kind of accepted this task on work but im really not sure if its possible.

  We are going to build a website where users can upload videos from their computers and mobile phone browsers. The video files can be a large range of aspect ratios, width, height, codex and file formats.

  I will have access to ffmpeg from php exec command on a web server.

  Is it possible to use this to convert the user files to one file format that works on computers, android and iphone.

  The requirements is that we can set a max width, to witch the video will be scaled, dynamically to match height.

  Does anyone know is this can be done, and be done in a reasonable amount of time. Will do project on 2 days. And if so some pointers in the right direction would be nice.

• RTSP Assertion desc failed at libswscale/swscale_internal.h:658

  3 novembre 2014, par Karthik Rao

  In RTSP that I try to play in iPhone 4s(iOS 7.1) I receive following error :

  Assertion desc failed at libswscale/swscale_internal.h:658

  I am using FFmpeg 2.4.2 and built the library using the script

  https://github.com/kewlbear/FFmpeg-iOS-build-script.

  I am using code from DFURTSPPlayer to play RTSP live streaming in iOS 7 devices and above.

  The player will play video for the first time if I reload Video then the app crashes giving the above error.

  The streaming works fine in other iOS 7 devices

  I have found the following thread in github regarding the same issue which is still open.

  Can anyone suggest me to overcome this assertion failed issue.