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• Using FFMPEG I get an error when trying to insert a fade after about 35 mins in a long video - is this possible ?

  8 avril 2019, par Matt Gardiner

  I have a source video that is an hour long from which I want to extract a couple of minutes towards the end and add a video fade in at the start of the cropped section.

  Using FFMPEG, I’m specifying the following command :

  ffmpeg -i MyLongVideo.mp4 -q:v 0 -y -ss 00:50:00.000 -to 00:52:00.000 -vf "fade=t=in:st=3000.0:d=1.0, scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih),pad=1280:720:(1280-iw)/2:(720-ih)/2" ./testoutput.ts

  This is intended to crop from the source video from 50:00.000 to 52:00.00 and fade in from the 50th minute for 0.5 seconds (so at 3000 seconds in - st=3000.0).

  This command that we build programmatically, works on shorter videos or when you crop from before about 35 minutes. For this longer video though I get an error that says :

  [fade @ 0000025399981e80] Value 3000.000000 for parameter 'st' out of range [0 - 2147.48]

  The 2147.48 is around the 35 minutes in seconds which explains why this command works for shorter videos or on crops earlier than 35 minutes.

  I’ve seen a number of other issues with FFMPEG talking about this ’magic’ 2147.48 number with parameter values. Is this some sort of hard limit ?

  Is there a way to do what I want to do ? I could do this in two passes - extract the section of video and then add the fade, but I’d rather do it in one command if possible - and it works for shorter/earlier crops.

• How to force ffmpeg to refresh overlay image more often ?

  30 avril 2019, par Alex Fomin

  I am trying to do sports live-streaming using ffmpeg. Score of a streaming match is being fetched from server and converted to png. This png must appear on top of the video.

  ffmpeg allows to put an overlay over a video stream using image2 demuxer. If I use -loop1, this overlay updates approximately every 5 seconds. How can I force ffmpeg to read it from disk more often ?

  My current attempt with overlay updating once in 5 seconds(mp4 video for testing purposes) :

  nice -n -19 ffmpeg \
  
          -re -y \
  
          -i s.mp4 \
  
          -f image2 -loop 1 -i http://127.0.0.1:3000/img \
  
          -filter_complex "[0:v][1:v]overlay" \
  
          -threads 4 \
  
          -v 0 -f mpegts -preset ultrafast udp://127.0.0.1:23000 \
  
          &

  P.S
  I know, that I can make youtube streaming widget on the website and put score on top of it just using html/css/js. But unfortunately it must be done directly in the video stream.

  P.P.S
  I know, that I can use ffmpeg drawtext. But it is not what I want. I have specially designed png, which must be updated as frequently, as possible ( once in 1-2 seconds would be just great )

• ffmpeg error SSL routines:ssl3_write_pending:bad write retry

  6 mai 2019, par boygiandi

  Recently, I see this error very often. Does anyone know what the error is and how to fix ? Please check full ffmpeg output here ( I already update openssl latest version from yum )

  ffmpeg version N-93715-gd0e4d04 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-36)
  
    configuration: --prefix= ....
  
  Input #0, mpegts, from '/tmp/4028813_video_0.ts':
  
    Duration: 00:04:08.19, start: 1.410111, bitrate: 1504 kb/s
  
    Program 1
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, progressive), 608x1080 [SAR 1:1 DAR 76:135], 30 fps, 30 tbr, 90k tbn, 60 tbc
  
      Stream #0:1[0x101](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 121 kb/s
  
  [ sh: 2019-05-06  9:39:46 ]
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, flv, to 'rtmps://live-api-s.facebook.com:443/rtmp/289693778580218?s_bl=1&s_sw=0&s_vt=api-s&a=Abxj1aU9OTqh0RtS':
  
    Metadata:
  
      comment         : gs4028813
  
      encoder         : Lavf58.27.103
  
      Stream #0:0: Video: h264 (High) ([7][0][0][0] / 0x0007), yuv420p(tv, bt709, progressive), 608x1080 [SAR 1:1 DAR 76:135], q=2-31, 3000 kb/s, 30 fps, 30 tbr, 1k tbn, 30 tbc
  
      Stream #0:1(eng): Audio: aac (LC) ([10][0][0][0] / 0x000A), 44100 Hz, stereo, fltp, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc58.52.100 aac
  
  [ sh: 2019-05-06  9:39:47 ]size=     169kB time=00:00:00.52 bitrate=2643.9kbits/s speed=1.03x
  
  ......
  
  [ sh: 2019-05-06  9:40:10 ]size=    3386kB time=00:00:22.72 bitrate=1220.7kbits/s speed=0.999x
  
  [ sh: 2019-05-06  9:40:11 ]size=    3842kB time=00:00:25.32 bitrate=1242.9kbits/s speed=   1x
  
  [tls @ 0x30ab3c0] error:00000000:lib(0):func(0):reason(0)82 bitrate=1247.3kbits/s speed=   1x
  
  av_interleaved_write_frame(): Input/output error
  
  [flv @ 0x3030f80] Failed to update header with correct duration.
  
  [flv @ 0x3030f80] Failed to update header with correct filesize.
  
  Error writing trailer of rtmps://live-api-s.facebook.com:443/rtmp/289693778580218?s_bl=1&s_sw=0&s_vt=api-s&a=Abxj1aU9OTqh0RtS: Input/output error
  
  frame=  776 fps= 30 q=-1.0 Lsize=    3932kB time=00:00:25.82 bitrate=1247.3kbits/s speed=   1x
  
  video:3530kB audio:406kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  [tls @ 0x30ab3c0] error:1409F07F:SSL routines:ssl3_write_pending:bad write retry