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• ffmpeg cannot generate thumbnail

  8 mai 2018, par rabbit

  In Windows to make a thumbnail with ffmpeg I use :

  ./ffmpeg -i 1.mp4 -ss 00:00:01 -f image2 1.jpg

  or :

  ./ffmpeg -ss 00:00:01 -i 1.mp4 -f image2 1.jpg

  But none can generate a thumbnail, it displays :

  ffmpeg -i input.mp4 -ss 1 -frames:v 1 output.jpg
  
  ffmpeg version N-91013-g8007a86363 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7.3.1 (GCC) 20180406
  
    configuration: 
  
    libavutil      56. 18.100 / 56. 18.100
  
    libavcodec     58. 19.101 / 58. 19.101
  
    libavformat    58. 13.102 / 58. 13.102
  
    libavdevice    58.  4.100 / 58.  4.100
  
    libavfilter     7. 21.100 /  7. 21.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 1
  
      compatible_brands: isom
  
      creation_time   : 2017-01-11T08:30:55.000000Z
  
      encoder         : My MP4Box GUI 0.6.0.6 /my-mp4box-gui.zymichost.com>
  
    Duration: 00:03:27.93, start: 0.000000, bitrate: 9345 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 2560x1440 [SAR 1:1 DAR 16:9], 9216 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc (default)
  
      Metadata:
  
        creation_time   : 2016-10-14T14:16:02.000000Z
  
        handler_name    : videoplayback.mp4
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-01-11T08:30:56.000000Z
  
        handler_name    : videoplayback (1).m4a
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0x55ad99ffe1c0] deprecated pixel format used, make sure you did set range correctly
  
  Output #0, image2, to 'output.jpg':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 1
  
      compatible_brands: isom
  
      encoder         : Lavf58.13.102
  
      Stream #0:0(und): Video: mjpeg, yuvj420p(pc), 2560x1440 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 30 fps, 30 tbn, 30 tbc (default)
  
      Metadata:
  
        creation_time   : 2016-10-14T14:16:02.000000Z
  
        handler_name    : videoplayback.mp4
  
        encoder         : Lavc58.19.101 mjpeg
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  frame=    0 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.00 bitrate=N/A speed=   0x    
  
  video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)

  and I find that the video which encoder is

   My MP4Box GUI 0.6.0.6 /my-mp4box-gui.zymichost.com>

  the ffmpeg cannot generate thumbnail. And how can I generate the thumbnail ?

• ffplay subscription to rtmp stream fails on first try

  2 janvier 2018, par ehouse

  I have an Electron application that does some video streaming through ffmpeg. It works fine on Windows, but I am having a small problem with it on Mac. I stream the desktop with ffmpeg, and try to subscribe to the rtmp stream. I know the rtmp stream is live because I can successfully grab a frame from it.

  The problem is, when I subscribe with ffplay, it does not work, the output looks like this :
  2018/01/01 20:57:25:618 [web]     nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0

  When I subscribe again (while the previous process is still ongoing), it works : 2018/01/01 20:57:25:828 [web]  340.93 M-V:  0.001 fd=   0 aq=    0KB vq=  131KB sq=    0B f=0/0

  The only difference in output to the command line is this :

  Input #0, live_flv, from 'rtmp:{stream-url-here}':=0/0   
  
  2018/01/01 20:57:15:427 [web]   Metadata:
  
  2018/01/01 20:57:15:427 [web]     Server          : NGINX RTMP 
  
  (github.com/sergey-dryabzhinsky/nginx-rtmp-module)
  
  2018/01/01 20:57:15:427 [web]     displayWidth    : 1024
  
  2018/01/01 20:57:15:428 [web]     displayHeight   : 640
  
  2018/01/01 20:57:15:429 [web]     fps             : 20
  
  2018/01/01 20:57:15:429 [web]     profile         : 
  
  2018/01/01 20:57:15:430 [web]     level           : 
  
  2018/01/01 20:57:15:430 [web]   Duration: 00:00:00.00, start: 
  
  316.500000, bitrate: N/A
  
  2018/01/01 20:57:15:430 [web]     Stream #0:0: Video: h264 (Constrained 
  
  Baseline), yuv420p(progressive), 1024x640, 20 fps, 20 tbr, 1k tbn, 40 
  
  tbc

  I am trying to figure out why it only works on the second time subscribing, and this is the difference, which I assumes signals the it successfully received the streams info, but I am trying to figure out why it only works the second time.

  Thanks !!

• Making a video from arbitrary named files using ffmpeg

  6 février 2018, par moo

  I have image files from a webcam, they are named in the format : 2018-02-06-16-40-05.jpg
  Is it possible to make a video out of these images without having to rename them in a format similar to image%04d.jpg, etc.