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• FFmpeg opening key info file - could not write header for output file

  13 mars 2021, par Hoang Nam

  I want muxer mp4 to m3u8 with key.
I can do this when I put all files in same directory.

  


  

  • File 480.mp4.key

  


  • File video 480.mp4

  


  • File hls info have name : "480.mp4.keyinfo"

  


  


  When I run the command ffmpeg -i 480.mp4 -hls_time 10 -hls_key_info_file 480.mp4.keyinfo output.mp4.m3u8
everything runs normally.

  


  However, I meet a problem when I move file "480.mp4.key" and file "480.mp4.keyinfo" into another directory such as /usr/local/WowzaStreamingEngine/keys/auto_scan/testhh/2/123/480.mp4.keyinfo
I also change key directory in file keyinfo

  


  After that I run

  


  ffmpeg -i 480.mp4 -hls_time 10 -hls_key_info_file 480.mp4.keyinfo output.mp4.m3u8 ffmpeg -i output/testhh/2/123/480.mp4 -hls_time 10 -hls_key_info_file /usr/local/WowzaStreamingEngine/keys/auto_scan/testhh/2/123/480.mp4.keyinfo output/testhh/2/123/480.mp4.m3u8


  


  But I get an error :

  


   error opening key info file /usr/local/WowzaStreamingEngine/keys/auto_scan//testhh/2/123/output/testhh/2/123/480.mp4.keyinfo
Could not write header for output file #0 (incorrect codec parameters ?): No such file or directory
Error initializing output stream 0:0 -- 


  


• automatically show blue screen in ffmpeg when live video source disconnects

  13 janvier 2015, par user1913115

  i’m capturing a live source using ffmpeg :

  ffmpeg -i rtsp://192.168.1.143/source -codec copy output.mp4

  which works great. the ip address is an address of an RTSP proxy server which takes in the camera itself as the source. i.e. my setup :

  camera ->> RTSP proxy ->> ffmpeg(output)

  if camera disconnects (accidentally or on purpose) the recording stops (obviously) and only continues when I re-connect the camera.

  Question : is there a way for ffmpeg to ’fill’ the down time with blue screen or green screen of some sort ?
  i know i can ’play’ a still image of a green screen using ffmpeg to record an mp4 out of it :

  ffmpeg -loop 1 -y -re -i green.jpg -r 30 -vcodec libx264 -an -f h264 greenvideo.mp4

  so i could set it up this way :

  ffmpeg(green) ->> ffmpeg(output)

  but I would need to run the command manually. is there a way for ffmpeg(output) to automatically detect the disconnect and use green.jpg as a ’video’ source ? or i can even create a 5-minute green.mp4 video of just green screen.

  put it another way, is it possible for ffmpeg to automatically switch input sources if one goes down ?

• How can I extract bonus images from a tv show DVD using ffmpeg ?

  5 avril 2020, par Hatem

  I'm using MakeMKVcon to automate episodes extraction. It do the job, expect the metadata. I have to rename files manually. But the problem here is that I want to extract some bonus pictures slideshow from the ISO but no software can detect it. I can only display those images using VLC (using the ISO file).

  



  Do you have any idea how to do that ?

  



  Here's the ffmpeg -i output :

  



  $ ffmpeg -i /path/to/iso/file.ISO
ffmpeg version git-2020-03-24-7239254 Copyright (c) 2000-2020 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.16)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/HEAD-7239254_1 --enable-shared --cc=clang --host-cflags=-fno-stack-check --host-ldflags= --enable-gpl --enable-libaom --enable-libmp3lame --enable-libopus --enable-libsnappy --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --disable-libjack --disable-indev=jack --enable-opencl --enable-videotoolbox --disable-htmlpages --enable-libfdk-aac --enable-nonfree
  libavutil      56. 42.101 / 56. 42.101
  libavcodec     58. 76.100 / 58. 76.100
  libavformat    58. 42.100 / 58. 42.100
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 77.100 /  7. 77.100
  libswscale      5.  6.101 /  5.  6.101
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
[mpeg @ 0x7f8111808200] Packet corrupt (stream = 4, dts = 2097152).
[mpeg @ 0x7f8111808200] stream 4 : no TS found at start of file, duration not set
[mpeg @ 0x7f8111808200] Could not find codec parameters for stream 4 (Audio: mp2, 0 channels): unspecified frame size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mpeg, from '/path/to/iso/file.ISO':
  Duration: 00:24:21.47, start: 0.280000, bitrate: 40817 kb/s
    Stream #0:0[0x1bf]: Data: dvd_nav_packet
    Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, bt470bg, progressive), 720x576 [SAR 16:15 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Side data:
      cpb: bitrate max/min/avg: 8000000/0/0 buffer size: 1835008 vbv_delay: N/A
    Stream #0:2[0x20]: Subtitle: dvd_subtitle
    Stream #0:3[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
    Stream #0:4[0x1d7]: Audio: mp2, 0 channels
At least one output file must be specified