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• ffmpeg cut flv but resulting video cannot be processed on youtube

  20 avril 2017, par user1017674

  I am using a simple ffmpeg command to cut some videos.

  The command i ran is

  ffmpeg -i test.flv -ss 0 -to 60 -c copy output.flv

  The output.flv turns out is not processable on youtube, but I am able to play this file locally using a random flv player that I downloaded.

  This is the log when cutting the video.

  The original file test.flv can be found here.
  https://drive.google.com/open?id=0B5eHJIAbpaIYaW95ZlFTMTUzNGc

  The output file output.flv can be found here.
  https://drive.google.com/open?id=0B5eHJIAbpaIYejk5dGJTOEo1UU0

  ./ffmpeg -i test.flv -ss 0 -to 60 -c copy diablo.flv
  
  ffmpeg version 3.3 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  
    configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --enable-libvidstab --enable-libx265 --disable-doc --arch=x86_64 --enable-runtime-cpudetect
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  Input #0, flv, from 'test.flv':
  
    Metadata:
  
      creator         : Coded
  
      metadatacreator : Yet Another Metadata Injector for FLV - Version 1.9
  
      hasKeyframes    : true
  
      hasVideo        : true
  
      hasAudio        : true
  
      hasMetadata     : true
  
      canSeekToEnd    : true
  
      datasize        : 69602014
  
      videosize       : 63600961
  
      audiosize       : 5917165
  
      lasttimestamp   : 292
  
      lastkeyframetimestamp: 292
  
      lastkeyframelocation: 69603218
  
    Duration: 00:04:51.68, start: 0.080000, bitrate: 1909 kb/s
  
      Stream #0:0: Video: h264 (High), yuv420p(progressive), 1280x720, 1742 kb/s, 25 fps, 25 tbr, 1k tbn, 50 tbc
  
      Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp, 158 kb/s
  
  Output #0, flv, to 'diablo.flv':
  
    Metadata:
  
      creator         : Coded
  
      metadatacreator : Yet Another Metadata Injector for FLV - Version 1.9
  
      hasKeyframes    : true
  
      hasVideo        : true
  
      hasAudio        : true
  
      hasMetadata     : true
  
      canSeekToEnd    : true
  
      datasize        : 69602014
  
      videosize       : 63600961
  
      audiosize       : 5917165
  
      lasttimestamp   : 292
  
      lastkeyframetimestamp: 292
  
      lastkeyframelocation: 69603218
  
      encoder         : Lavf57.71.100
  
      Stream #0:0: Video: h264 (High) ([7][0][0][0] / 0x0007), yuv420p(progressive), 1280x720, q=2-31, 1742 kb/s, 25 fps, 25 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: aac (LC) ([10][0][0][0] / 0x000A), 48000 Hz, stereo, fltp, 158 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame= 1252 fps=0.0 q=-1.0 Lsize=   12074kB time=00:00:59.98 bitrate=1648.8kbits/s speed=1.21e+03x    
  
  video:10849kB audio:1153kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.598021%

• Trim with transition/fade using FFMPEG given a list of timestamps

  19 janvier 2024, par realsarm

  I have a video and a list of timestamps that I want to filter.

  


  [
  {
    "timestamp": [10, 20],
    "state": true
  },
  {
    "timestamp": [30, 40],
    "state": false
  },
  {
    "timestamp": [50, 60],
    "state": true
  },
  {
    "timestamp": [70, 80],
    "state": true
  }
]


  


  I have a script like this to trim based on state.

  


      video_path = Path(video_in.name)
    video_file_name = video_path.stem

    timestamps_to_cut = [
        (timestamps_var[i]['timestamp'][0], timestamps_var[i]['timestamp'][1])
        for i in range(len(timestamps_var)) if timestamps_var[i]['state']]

    between_str = '+'.join(
        map(lambda t: f'between(t,{t[0]},{t[1]})', timestamps_to_cut))

    if timestamps_to_cut:
        video_file = ffmpeg.input(video_path)
        video = video_file.video.filter(
            "select", f'({between_str})').filter("setpts", "N/FRAME_RATE/TB")
        audio = video_file.audio.filter(
            "aselect", f'({between_str})').filter("asetpts", "N/SR/TB")

        output_video = f'./videos_out/{video_file_name}.mp4'
        ffmpeg.concat(video, audio, v=1, a=1).output(
            output_video).overwrite_output().global_args('-loglevel', 'quiet').run()


  


  How can I smooth out this trimming like adding a fade or smoothing transition each time state is false ?

  


• Reading RTMP streams using FFMPEG returns AVERROR_EOF randomly

  9 octobre 2013, par user2628781

  I am using FFMpeg to receive RTMP streams. This logic is placed in a custom video player I am building.

  I managed to successfully connect to the RTMP stream and display the video correctly. However, after a period in time, the stream terminates prematurely with an AVERROR_EOF when I perform av_read_frame().

  This indicates to me that the file has ended so my demux, video and audio threads terminates thinking that the video has ended.
  However, the video playback hasn't yet reached its end (in the case of a file streamed through rtmp) or from a live stream (which runs forever). The EOFs are received very randomly so it may run for say 7 min before this occurs or after 3 mins.

  Is this a characteristic behaviour of RTMP or am I doing something incorrectly ?
  I am also having a similar problem with Http Live Streams using FFMpeg.

  A small snippet of the code is provided below :

   AVPacket packet;
  
  //start timeout timer and timeout
  
  __interrupt_timer.start();
  
  
  
  int ret = av_read_frame(format_context, &packet); //0: ok, <0: error/end
  
  
  
  
  
  //invalidate the timer
  
  __interrupt_timer.invalidate();
  
  
  
  if (ret != 0) {
  
      if (ret == AVERROR_EOF) { //end of file. FIXME: why no eof if replaying by seek(0)?            
  
          if (!eof) {
  
              eof = true;
  
              started_ = false;
  
              pkt->data = QByteArray(); //flush
  
              pkt->markEnd();
  
              qDebug("End of file. %s %d", __FUNCTION__, __LINE__);
  
              emit finished();
  
              return true;
  
          }
  
          pkt->data = QByteArray(); //flush
  
          //return true;
  
          return false; //frames after eof are eof frames
  
      } else if (ret == AVERROR_INVALIDDATA) {
  
          qWarning("AVERROR_INVALIDDATA");
  
      } else if (ret == AVERROR(EAGAIN)) {
  
          return true;
  
      }
  
      qWarning("[AVDemuxer] error: %s", av_err2str(ret));
  
      return false;
  
  }