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  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
    Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
    Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
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    All uploaded files are stored online in their original format, so you can (...)

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  • Adding current time as timestamp in H.264 raw stream with few frames

    2 avril 2020, par Michaël

    I have a program that spits out an H.264 raw stream (namely, screenrecord on Android). I'm using FFmpeg to add a PTS (presentation time stamp) on the frames as follows :

    



    $ my-program | ffmpeg -i - -filter:v setpts='(RTCTIME - RTCSTART) / (TB * 1000000)' out.mp4


    



    This filter computes the current time, and puts it as the PTS.

    



    The trouble is that my-program does not produce any output if there isn't any change in the video. Since FFmpeg seems to wait for a bunch of frames before putting them through the setpts filter, the computed PTS won't be correct. In particular, the last frame of a sequence will be timestamped when the next sequence starts.

    



    Is there a way (with FFmpeg or otherwise) to add the current time as PTS to H.264 raw frames, where "current time" is when receiving the frame, rather than outputting it ?

    



    Note : The problem is not from buffering from the pipe.

    


  • ffmpeg read the current segmentation file

    9 août 2018, par Guaronet

    I’m developing a system using ffmpeg to store some ip camera videos.
    i’m using the segmentation command for store each 5 minutes a video for camera.
    I have a wpf view where i can search historycal videos by dates. In this case i use the ffmpeg command concat to generate a video with the desire duration.
    All this work excelent, my question is : it’s possible concatenate the current file of the segmentation ? i need for example, make a serch from the X date to the current time, but the last file is not generated yet by the ffmpeg. when i concatenate the files, the last one is not showing because is not finish the segment.

    I hope someone can give me some guidance on what I can do.

  • avformat/mov : fix frag_index.current out of sync

    30 juillet 2022, par Zhao Zhili
    avformat/mov : fix frag_index.current out of sync

    frag_index.current is used by cenc_filter, and is updated inside
    
mov_read_moof. It can out of sync regarding to mov_read_packet.
    

    Partly fix ticket #9807.
    

    Signed-off-by : Zhao Zhili <zhilizhao@tencent.com>
    • [DH] libavformat/mov.c

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