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• ffmpeg I want to combine the three command in one command

  12 janvier 2019, par Abdulwahed AbuAbed

  hello I’m new here I want to marge many command in one, like add subtitle file , image (watermark) and write word in top right in video .
  without effecting video Quality and size , and if it possible make it fast like a single command .

  ffmpeg -i input.mkv -vf subtitles=subtitle.srt -sn out.mkv  
  
  ffmpeg -i input.mkv -vf "movie=image.png [watermark]; [in][watermark] overlay=10:10 [out]" out.mkv  
  
  ffmpeg -i input.mkv -vf drawtext=text='Hallo':x=10:y=H-th-10:fontfile=/path/to/font.ttf:fontsize=12:fontcolor=white:shadowcolor=black:shadowx=5:shadowy=5" out.mkv

• Should libavcodec handle non-packed/non-byte-aligned mp3 packets ?

  27 août 2015, par Rhythmic Fistman

  I’m transcoding shoutcast streams using libavcodec and I noticed that during the day I get a few 10s’ of packets that it cannot decode without some help :

  1. Leading zero bytes before a packet sync word, e.g. 0x0000fffa

  2. non-byte aligned syncword, e.g 0x82a0fffa

  In the first case I have to toss out the zero bytes and in the second I have to shift the data up by an odd number of nibbles.

  I don’t have a watertight knowledge of the mp3 spec (is there one ?), but my impression was that the packet format was a bit oriented, not byte, so both types of packets look right to me.

  So who is in the wrong here ?

  Is it libavcodec for not parsing valid packets ?

  Or the stream encoder for producing non-standard packets ?

• ffmpeg : Time information does not match video duration

  8 novembre 2017, par Harry Developer

  I’m using tvheadend to record broadcasts to disc (running ubuntu). Later, I’m playing the files using players like MX Videoplayer or IJK player. Sometimes, the time information of the media files is weired. E.g., using

  ffprobe -i some-file.ts

  shows a lenght of 10 hours or even 20 hours, although the recording is only 2 hours long. Is this a ffmpeg bug ? What can be done to get the correct media length ?

  Here is the ffprobe output of the original file after recording it on disc :

  ffprobe version N-85175-ga434657 Copyright (c) 2007-2017 the FFmpeg developers
  
    built with gcc 4.9.2 (Raspbian 4.9.2-10)
  
    configuration:
  
    libavutil      55. 59.100 / 55. 59.100
  
    libavcodec     57. 90.100 / 57. 90.100
  
    libavformat    57. 72.100 / 57. 72.100
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 83.100 /  6. 83.100
  
    libswscale      4.  7.100 /  4.  7.100
  
    libswresample   2.  8.100 /  2.  8.100
  
  [mp3 @ 0x24caef0] Header missing
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 1 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
      Last message repeated 3 times
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 1 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
      Last message repeated 1 times
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 1 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
      Last message repeated 1 times
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 1 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 9 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
      Last message repeated 1 times
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 1 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 11 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 318 times
  
  [mpegts @ 0x247cd40] decoding for stream 4 failed
  
  [mpegts @ 0x247cd40] start time for stream 3 is not set in estimate_timings_from_pts
  
  [mpegts @ 0x247cd40] PES packet size mismatch
  
      Last message repeated 2 times
  
  [mpegts @ 0x247cd40] Could not find codec parameters for stream 4 (Audio: mp3, 0 channels, s16p): unspecified frame size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, mpegts, from '30d0b11f21ce831b56cc306d9c4a18c0.backup':
  
    Duration: 10:03:33.54, start: 60774.296367, bitrate: 1883 kb/s
  
    Program 12101
  
      Metadata:
  
        service_name    : ?RTL Television
  
        service_provider: ?Unitymedia
  
      Stream #0:0[0x20b]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
  Stream #0:1[0x20c](ger): Audio: mp2 ([4][0][0][0] / 0x0004), 48000 Hz, stereo, s16p, 192 kb/s
  
  Stream #0:2[0x20d](ger): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, fltp, 384 kb/s
  
  Stream #0:3[0x60f](ger): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
  
    No Program
  
  Stream #0:4[0x210]: Audio: mp3, 0 channels, s16p

  Here is the output of ffprobe somefile -show_entries stream=index,start_time,duration -of compact -v 0 :

  program|stream|index=0|start_time=88858.718567|duration=8129.120000
  
  stream|index=1|start_time=88858.104267|duration=8129.496000
  
  stream|index=2|start_time=88858.104289|duration=8129.498833
  
  stream|index=3|start_time=60774.296367|duration=36213.542200
  
  
  
  stream|index=0|start_time=88858.718567|duration=8129.120000
  
  stream|index=1|start_time=88858.104267|duration=8129.496000
  
  stream|index=2|start_time=88858.104289|duration=8129.498833
  
  stream|index=3|start_time=60774.296367|duration=36213.542200
  
  stream|index=4|start_time=60774.296367|duration=8129.520000