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  • How to save video as memory stream to .m4s freagments ?

    13 septembre 2019, par Yehor Chankov

    Summary

    I have a video streaming application, that processes videos uploaded by a user and serves it back to the user. Previously a user had to wait until the whole video had been processed and could only access it after that. Now I want my users to be able to start watching a video as soon as the first fragment is processed.

    The main idea is that I have an mp4 file, that I upload in memory using python and store as a 4d numpy array. Then I divide it into separate chunks and process each chunk.

    Solutions so far

    All solutions that I found so far are based on the idea that a complete mp4 video file exists, so that m4s fragments can be created by dividing it.

    Expected result

    What I want to achieve is that after each chunk is processed, it gets saved from memory to disk as m4s fragment, that can be served to a user immediately via MPEG dash .mpd playlist that links to all these fragments on disk.

  • How to save video from memory stream to .m4s freagments ?

    13 septembre 2019, par Yehor Chankov

    Summary

    I have a video streaming application, that processes videos uploaded by a user and serves it back to the user. Previously a user had to wait until the whole video had been processed and could only access it after that. Now I want my users to be able to start watching a video as soon as the first fragment is processed.

    The main idea is that I have an mp4 file, that I upload in memory using python and store as a 4d numpy array. Then I divide it into separate chunks and process each chunk.

    Solutions so far

    All solutions that I found so far are based on the idea that a complete mp4 video file exists, so that m4s fragments can be created by dividing it.

    Expected result

    What I want to achieve is that after each chunk is processed, it gets saved from memory to disk as m4s fragment, that can be served to a user immediately via MPEG dash .mpd playlist that links to all these fragments on disk.

  • Programmatically convert flv to mp4 on iOS

    13 août 2018, par Amitg2k12

    In our iOS app, we will receive flv**(Container)** file having video and audio streaming something like this

    Input #0, flv, from 'test.flv':
    

    
  Metadata:
    
    streamName      : flvLiveStream
    
    encoder         : Lavf55.12.100
    
  Duration: 00:00:48.00, start: 66064.401000, bitrate: 632 kb/s
    
    Stream #0:0, 41, 1/1000: **Video: h264 (Baseline)**, 1 reference frame, yuv420p(progressive, left), 1280x720, 0/1, 15 fps, 1k tbr, 1k tbn
    
    Stream #0:1, 14, 1/1000: **Audio: pcm_alaw,** 8000 Hz, mono, s16, 64 kb/s

    and this needs to be converted to mp4 container and format as well, I am trying using ffmpeg, I believe thats only the way , using transcoding.c file but failed at this stage

    Impossible to convert between the formats supported by the filter 'in' and the filter 'auto_scaler_0'

    I am trying to learn from OSX command like ffmpeg -I test.flv test.mp4 ,

    is that feasible to port to iOS
    will it work in all different scenarios,

    In Summary

    --- What is the best possible way to convert flv to mp4 on the iOS device
    where video will be in h264 and audio will be in swf codec ?

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