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Sur d’autres sites (6444)

  • FFmpeg extracting current frame time stamp

    23 juillet 2015, par 2di

    I need to extract frames in certain interval of the video, (eg from 40 sec to 50 sec).
    Working in c++.
    First I am getting position where I need to start reading

    static double t = 10 ;//time in seconds
    
int64_t timestamp = t * AV_TIME_BASE; //destination time
    
av_seek_frame( pFormatContext , -1 ,  timestamp + pFormatContext->start_time ,AVSEEK_FLAG_BACKWARD );

    Then I using av_read_frame to get all sequential frames.
    The problem that I have is that I dont know when to stop. How can I check that I reached my end interval (eg 50 sec) ?

    Thanks.

  • How to get 4 video frames on the specified time [on hold]

    28 décembre 2015, par Plush

    I want to receive 4 video frames of the JPEG format, with the specified time.
    How it is possible to execute request in one command ?

  • FFmpeg C API HLS real time timestamps

    7 septembre 2022, par Robin

    I'm using the FFmpeg C API in C++ to read from a HLS stream. I need to know the real time of each AVPacket. I can extract the pts using AVPacket::pts but that is relative to the start of the stream.

    


    This is how the .m3u8 file looks :

    


    #EXTM3U
#EXT-X-VERSION:3
#EXT-X-ALLOW-CACHE:NO
#EXT-X-TARGETDURATION:10
#EXT-X-MEDIA-SEQUENCE:0

#EXT-X-PROGRAM-DATE-TIME:2022-09-07T14:01:56.612+02:00
#EXTINF:10.322561783,
1662552116.ts
#EXT-X-PROGRAM-DATE-TIME:2022-09-07T14:02:06.935+02:00
#EXTINF:10.320075936,
1662552126.ts

...


    


    The .m3u8 file contains an accurate EXT-X-PROGRAM-DATE-TIME, but how can I extract the one of the currently playing segment ?

    


    Alternatively, the file name of each .ts file is the unix timestamp in seconds. Can I extract that somehow ?

    


    If none of those are possibly, is it possible to control the exact number of preloaded segments ? I know the (approximate) segment length is 10 seconds so I could just do the following when receiving the first AVPacket :

    


    start_time = current_time - segment_count * segment_length`
start_pts = first_av_packet.pts


    


    And then to get the time of a later AVPacket, I could do :

    


    packet_time = start_time + new_packet.pts - start_pts


    


    This wouldn't give the same accuracy since the segments are not exactly the same length, but that is okay.

    


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