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• Why is this video file not supported in mobile safari ?

  30 septembre 2015, par pinkboi

  I’m using libffmpeg to generate my video and it’s playable on desktop browsers and many other places (including android). I looked at this earlier post, and the linked-to Apple guidelines but nothing stuck out at me as wrong about my stream. Are only certain framerates supported ? Here is the output of ffprobe -show_streams on a generated file :

  [STREAM]
  
  index=0
  
  codec_name=aac
  
  codec_long_name=AAC (Advanced Audio Coding)
  
  profile=LC
  
  codec_type=audio
  
  codec_time_base=1/44100
  
  codec_tag_string=mp4a
  
  codec_tag=0x6134706d
  
  sample_fmt=fltp
  
  sample_rate=44100
  
  channels=2
  
  channel_layout=stereo
  
  bits_per_sample=0
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/44100
  
  start_pts=-2048
  
  start_time=-0.046440
  
  duration_ts=419840
  
  duration=9.520181
  
  bit_rate=63999
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=N/A
  
  nb_frames=410
  
  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]
  
  [STREAM]
  
  index=1
  
  codec_name=h264
  
  codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  profile=Constrained Baseline
  
  codec_type=video
  
  codec_time_base=1/48
  
  codec_tag_string=avc1
  
  codec_tag=0x31637661
  
  width=500
  
  height=500
  
  has_b_frames=0
  
  sample_aspect_ratio=0:1
  
  display_aspect_ratio=0:1
  
  pix_fmt=yuv420p
  
  level=30
  
  color_range=N/A
  
  color_space=unknown
  
  color_transfer=unknown
  
  color_primaries=unknown
  
  chroma_location=left
  
  timecode=N/A
  
  is_avc=1
  
  nal_length_size=4
  
  id=N/A
  
  r_frame_rate=24/1
  
  avg_frame_rate=24/1
  
  time_base=1/12288
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=92672
  
  duration=7.541667
  
  bit_rate=24286
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=8
  
  nb_frames=181
  
  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=VideoHandler
  
  [/STREAM]

• After uploading .aab file it is not showing app size based on mobile architecture

  11 septembre 2019, par Mani

  In my project i am using assets ffmpeg static binarie files for both 32 and 64 bit it’s working fine in both mobile architectures but i have problem about .aab file size. The app size is increased to 17mb after adding 64 bit file,I am using .aab file for uploading but the size is same for both the architectures.Please tell me how to reduce app size based on mobile architecture thank you.

• Architecture of video-based service for mobile phones

  27 juin 2015, par David Azar

  I guess this is more of a conceptual question than a technical one.

  I’m trying to figure out the best way to upload short videos to a server and also be able to download them and watch them on both Android and iOS.

  Lets focus on Android for the moment.

  I’ve done some experiments, and my results have been :

  • I’m able to compress 12-14MB video down to 500KB using FFMPEG lib with pretty good results in quality, but it takes about 12 seconds.

  • Next, im uploading those videos to my Parse backend as ParseFile to store them.

  • Finally, i can download them and watch them with no problem using a VideoView widget.

  Now, for the tests i’ve been running, these are great results. But i want to see if there is a better way to manage and scale all of this.

  My questions are :

  • Is there a better, lighter way to compress video ?

  • Is Parse the right way to go ?

  • How can i stream videos instead of downloading them and storing the on local storage before playing them ? i know this will cause my app to use significant space on disk and i dont want that.

  • How do big companies do this kind of tasks ?

  I’ve heard Amazon S3 is a cool thing for projects like this one, also Google Cloud Platform. I want to understand the best approach before building everything so i can do it the right way and also, provide the absolute best user experience for watching these videos.