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Sur d’autres sites (11972)

  • HEVC : Fetching the input width and height from input bin stream

    3 septembre 2014, par Zax

    I have created an elementary bin stream using HM-12.0 reference code. So the out put is an HEVC encoded bin stream (say input.bin).

    I have a task which involves reading the header of this elementary stream. That is i need to fetch information such a the stream width, height etc. from the input.bin file.

    After seeing a lots of streams, i can conclude that all these bin streams starts from the sequence :

    00 00 00 01

    So whenever i see this sequence in any bin stream, i can say that this stream has to be decoded by HEVC decoder.

    Further if i want to fetch the width, height, fps etc. from the input.bin (like ff_raw_video_read_header function in ffmpeg), that are the steps need to be performed to fetch this information ?

    I have gone through the parsing section of the HEVC draft, but its very complicated for my level in video domain. Can anyone suggest a simple way to fetch the required information from the encoded bin file ?

    Any suggestions will be really helpful to me. Thanks in advance.

  • HEVC : Fetching the input width and height from input bin stream

    1er juillet 2022, par Zax

    I have created an elementary bin stream using HM-12.0 reference code. So the out put is an HEVC encoded bin stream (say input.bin).

    



    I have a task which involves reading the header of this elementary stream. That is i need to fetch information such a the stream width, height etc. from the input.bin file.

    



    After seeing a lots of streams, i can conclude that all these bin streams starts from the sequence :

    



    00 00 00 01


    



    So whenever i see this sequence in any bin stream, i can say that this stream has to be decoded by HEVC decoder.

    



    Further if i want to fetch the width, height, fps etc. from the input.bin (like ff_raw_video_read_header function in ffmpeg), that are the steps need to be performed to fetch this information ?

    



    I have gone through the parsing section of the HEVC draft, but its very complicated for my level in video domain. Can anyone suggest a simple way to fetch the required information from the encoded bin file ?

    



    Any suggestions will be really helpful to me. Thanks in advance.

    


  • FFMPEG support for WebVTT subtitle inline cues

    28 janvier 2024, par Cole

    I am trying to "soft" embed webvtt subtitles into my video using FFMPEG. I need to be able to place to the subtitles at a specific location within the video as well.

    


    I have created a webvtt file that goes along with my video however ; when I pass this through FFMPEG and then try to play the video in VLC media player, the positioning seems to be ignored.

    


    When I play the original video in VLC and then load the same webvtt subtitles file, the positioning is correct ?

    


    Does FFMPEG support the webvtt cues ? It is very possible that I am not passing the correct flags to FFMPEG.

    


    VTT EXAMPLE FILE (i.e. subtitle.vtt) :

    


    WEBVTT

00:00:00.000 --> 00:00:03.000 line:-1 align:right
TESTING 1

00:00:04.000 --> 00:00:08.000 line:-1 align:right
TESTING 2


    


    FFMPEG CLI :

    


    ffmpeg -y -i video.mp4 -i subtitle.vtt -c copy -c:s mov_text vttout.mp4


    


    Test Cases :

    


      

    1. Playing MP4 video in VLC and manually loading the webvtt subtitles -> position is correct.

      2. 


    2. Passing MP4 video through FFMPEG to soft embed the subtitles in container and then playing in VLC -> subtitles are present but position is ignored.

      3. 


    


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