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• ffmpeg setpts filter not applied to output

  29 avril 2019, par joe5

  Learning to speed up and slow down video using the ffmpeg setpts filter, but I am struggling to get a simple expression to work.

  ffmpeg -i .\F5-ff.mp4 -filter:v "setpts=0.25*PTS" ff-test3.mp4

  I get the output file, but it is not any faster than the original.

  I’m sorry if this has already been addressed. Most related post I’ve found were trouble shooting more complex operations past this step. Im working in a powershell terminal fyi.

• Revision c7acd6db5e : Added unit test for vp8_post_proc_down_and_across This is a unit test for the p

  19 juin 2012, par Adrian Grange

  Changed Paths : Add /test/pp_filter_test.cc Modify /test/test.mk Added unit test for vp8_post_proc_down_and_across This is a unit test for the post-processing functions : - vp8_post_proc_down_and_across_c - vp8_post_proc_down_and_across_mmx - vp8_post_proc_down_and_across_xmm Change-Id : (...)

• How to add new video files to HLS ?

  3 décembre 2022, par Nori

  I'm having trouble live streaming a video file that is constantly updated using HLS.

  


  Video files recorded by POST from the client are sent to the server.

  


  The server converts the received video to HLS (.m3u8 .ts).

  


  You can convert to .m3u8 and .ts with the following code.

  


  def to_m3u8(movie_path: Path):
    """
    Convert mp4 to m3u8.
    :param movie_path:
    :return: m3u8 file path
    """
    m3u8_path = movie_path.parent/f"{movie_path.stem}.m3u8"
    command = f"ffmpeg -i {movie_path} " \
              f"-c copy " \
              f"-f segment -segment_time_delta 0 " \
              f"-segment_list_type hls " \
              f"-movflags +faststart " \
              f"-preset ultrafast " \
              f"-hls_playlist_type event " \
              f"-hls_flags append_list " \
              f"-hls_list_size 10 " \
              f"-segment_list_size 0 " \
              f"-segment_list {m3u8_path} " \
              f"-segment_format mpegts " \
              f"{movie_path.parent}/segment_%03d.ts"

    logger.info(f"command: {command}")
    subprocess.run(command, shell=True)
    return m3u8_path


  


  I can see the .m3u8 .ts file being overwritten every time I receive POST data.

  


  But when I open the .m3u8 in VLC it plays a few seconds of video and then stops.

  


  .m3u8 file is like this.

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-ALLOW-CACHE:YES
#EXT-X-TARGETDURATION:5
#EXTINF:4.660000,
segment_000.ts
#EXTINF:4.120000,
segment_001.ts
#EXTINF:0.160000,
segment_002.ts
#EXT-X-ENDLIST


  


  I thought #EXT-X-ENDLIST is don't need. So I remove the line. Below code.

  


      with open(m3u8_path, "r") as f:
        lines = f.readlines()
    with open(m3u8_path, "w") as f:
        for line in lines:
            if line.startswith("#EXT-X-ENDLIST") is False:
                f.write(line)


  


  How ever it can't streaming. It's behave like a movie file.

  


  How can I read the newly added files at any time ?

  


  Can it be handled by changing FFmpege options ?