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• GStreamer qtdemux issue when start time is set

  17 décembre 2019, par user3157892

  I am using GStreamer to stream videos to RTSP and have problems with many of the videos I was given. I have thousands of videos that were recorded with FFMPEG to mp4. I can’t play any of the videos back as qtdemux reports the following error :

  qtdemux qtdemux.c:9129:qtdemux_parse_segments:<qtdemux0> Segment 0  extends to 4:57:00.937000000 past the end of the file duration 0:00:59.544000000 it will be truncated
qtdemux qtdemux.c:9129:qtdemux_parse_segments:<qtdemux0> Segment 1  extends to 4:58:00.481000000 past the end of the file duration 4:57:00.937000000 it will be truncated</qtdemux0></qtdemux0>

  From what I can tell this is related to the start_pts of the video. Here is the output of ffprobe for the same video :

    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      title           : libRtspServer
  
      encoder         : Lavf58.20.100
  
    Duration: 00:00:59.07, start: 5461.268000, bitrate: 2749 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 2748 kb/s, 15.02 fps, 15 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  [STREAM]
  
  index=0
  
  codec_name=h264
  
  codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  profile=Main
  
  codec_type=video
  
  codec_time_base=29533/887000
  
  codec_tag_string=avc1
  
  codec_tag=0x31637661
  
  width=1920
  
  height=1080
  
  coded_width=1920
  
  coded_height=1080
  
  has_b_frames=0
  
  sample_aspect_ratio=1:1
  
  display_aspect_ratio=16:9
  
  pix_fmt=yuvj420p
  
  level=41
  
  color_range=pc
  
  color_space=bt709
  
  color_transfer=bt709
  
  color_primaries=bt709
  
  chroma_location=center
  
  field_order=unknown
  
  timecode=N/A
  
  refs=1
  
  is_avc=true
  
  nal_length_size=4
  
  id=N/A
  
  r_frame_rate=15/1
  
  avg_frame_rate=443500/29533
  
  time_base=1/90000
  
  start_pts=491514120
  
  start_time=5461.268000
  
  duration_ts=496830060
  
  duration=5520.334000
  
  bit_rate=2748339
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=8
  
  nb_frames=887
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=1
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  TAG:language=und
  
  TAG:handler_name=VideoHandler
  
  [/STREAM]

  Note the start time - start_time=5461.268000

  One possible solution is to remux all of the videos to have a start time of 0.00. This doesn’t really seem like the ideal solution.

  Is there a way to manipulate GStreamer into playing the video from time 0 instead of trying to seek to the start time ? It could be possible that the videos are just not written correctly.

• Why is FFProbe (using fluent-ffmpeg) returning incomplete and inaccurate metadata ?

  18 avril 2024, par volume one

  I am returning metadata about a file using ffprobe. The file can be found here.

  


  I am using fluent-ffmpeg in Node.js which shouldn't make any difference. Its just nicer to use than a command-line.

  


  The code goes like this :

  


  ffmpeg.ffprobe('https://devxxx001.s3.amazonaws.com/vertical-hd_720_1280_30fps.mp4'), function (err, metadata) {
 console.log(JSON.stringify(metadata));
});


  


  The metadata output I receive is this :

  


  {
  "streams": [
    {
      "index": 0,
      "codec_name": "h264",
      "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
      "profile": "High",
      "codec_type": "video",
      "codec_tag_string": "avc1",
      "codec_tag": "0x31637661",
      "width": 720,
      "height": 1280,
      "coded_width": 720,
      "coded_height": 1280,
      "closed_captions": 0,
      "film_grain": 0,
      "has_b_frames": 2,
      "sample_aspect_ratio": "N/A",
      "display_aspect_ratio": "N/A",
      "pix_fmt": "yuv420p",
      "level": 32,
      "color_range": "tv",
      "color_space": "bt709",
      "color_transfer": "bt709",
      "color_primaries": "bt709",
      "chroma_location": "left",
      "field_order": "progressive",
      "refs": 1,
      "is_avc": "true",
      "nal_length_size": 4,
      "id": "0x1",
      "r_frame_rate": "30/1",
      "avg_frame_rate": "30/1",
      "time_base": "1/30",
      "start_pts": 0,
      "start_time": 0,
      "duration_ts": 267,
      "duration": 8.9,
      "bit_rate": 2382497,
      "max_bit_rate": "N/A",
      "bits_per_raw_sample": 8,
      "nb_frames": 267,
      "nb_read_frames": "N/A",
      "nb_read_packets": "N/A",
      "extradata_size": 47,
      "tags": {
        "creation_time": "2020-05-19T10:09:46.000000Z",
        "language": "und",
        "handler_name": "L-SMASH Video Handler",
        "vendor_id": "[0][0][0][0]",
        "encoder": "AVC Coding"
      },
      "disposition": {
        "default": 1,
        "dub": 0,
        "original": 0,
        "comment": 0,
        "lyrics": 0,
        "karaoke": 0,
        "forced": 0,
        "hearing_impaired": 0,
        "visual_impaired": 0,
        "clean_effects": 0,
        "attached_pic": 0,
        "timed_thumbnails": 0,
        "captions": 0,
        "descriptions": 0,
        "metadata": 0,
        "dependent": 0,
        "still_image": 0
      }
    }
  ],
  "format": {
    "filename": "https:/devxxx001.s3.amazonaws.com/vertical-hd_720_1280_30fps.mp4",
    "nb_streams": 1,
    "nb_programs": 0,
    "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
    "format_long_name": "QuickTime / MOV",
    "start_time": 0,
    "duration": 8.9,
    "size": 2654719,
    "bit_rate": 2386264,
    "probe_score": 100,
    "tags": {
      "major_brand": "mp42",
      "minor_version": "0",
      "compatible_brands": "mp42mp41isomavc1",
      "creation_time": "2020-05-19T10:09:46.000000Z"
    }
  },
  "chapters": []
}


  


  I need to know the aspect ratio of the video so that I can display it properly but ffprobe is returning "N/A" :

  


   "sample_aspect_ratio": "N/A",
 "display_aspect_ratio": "N/A",


  


  In addition, if I want to know the video container format (mp4 in this case), it is showing multiple formats instead of just one :

  


   "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
 "format_long_name": "QuickTime / MOV",


  


  I believe it may be an issue with the ffprobe command but I am unable to pass it options like on the command-line. Even then I don't know what options need to be passed to get the correct metadata.

  


• recording live stream video from tv card using ffmpeg at window [on hold]

  6 décembre 2013, par user2688423

  I want to record live stream every 1 second from tv card(tv signal) using ffmpeg in window.

  first of all, to record live video from tv card, I tried below.

  1. First I tried this.

  ffmpeg -list_devices true -f dshow -i dummy

  then the result is

  " [dshow @ 000000000024e6fe0] DirectShow video devices
  [dshow @000000000024e6fe0] "SKYTV HD USB Maxx Video Capture"
  [dshow @
  000000000024e6fe0] DirectShow audio devices
  [dshow @
  000000000024e6fe0] "Analog Audio In(SKYTV HD USB Ma" "

  so I tried

  ffmpeg -f dshow -i video="SKYTV HD USB Maxx Video Capture" -r 20
  -threads 0 D ://test.mkv

  But it didn't work. the Error message is

  "[dshow@000000000034d920] Could not run filter
  video=SKYTV HD USB
  Maxx Video Capture : Input/output error"

  I use the device called 'SKYTV HD USB Maxx Video Capture' for getting tv signal(TV card).

  1. The First way deosn't work, I tried different way.

  ffmpeg -y -f vfwcap -i list

  then the result is
  "

  [dshow @ 00000000003fd760] Driver 0

  [dshow @ 00000000003fd760] Microsoft WDM Image Capture (Win32)
  [dshow @ 00000000003fd760] Version : 6.1.7601.17514 list : Input/output error

  "

  so I tried

  ffmpeg -y -f vfwcap -r 25 -i 0 D ://out.mp4

  then, there is some out.mp4 file in D drive but the file is nothing.
  (I think it is not TV signal)

  what should i do to record live video every 1 second from tv card(tv signal) using ffmpeg in window ? And How can I set channel at tvcard(Because I want to get tv signal, there are many channels).

  Please help..!