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• Concat multiple (self-generated) videos using ffmpeg on raspbian linux

  25 février 2016, par Thomas Kekeisen

  I am a very talented sleep talker, so I decided to write a solution that records the things I talk at night to make funny videos with subtitles of it. The project is nearly done, but I got a big problem with concating videos I generated before.

  The video parts are generated from single png frames using this command :

  ffmpeg -y -framerate 15 -i "${images_file_path}" -c:v libx264 -r 30 -pix_fmt yuv420p "${video_file_path}"

  Then the sound is added using this command (got this from #9049970 and #11779490) :

  ffmpeg -y -i "${video_file_path}" -i "${mp3_file_path}" -map 0:v -map 1:a -vcodec copy -acodec copy -shortest "${final_video_file_path}"

  All this is causing no problems so far, but I think it may be relevant to know how the videos are generated. I can watch all this and get valid video and sound - the full source code of this first part can be found here.

  Now I added a feature that is able to generate "full videos" containing a title and a various number of previously generated "video parts" using this command :

  ffmpeg -f concat -i "${video_list_path}" -filter_complex "${filter_string} concat=n=${input_file_counter}:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" "${full_video_path}"

  But something is wrong with it and I get this error :

  Invalid file index 1 in filtergraph description [0:v:0] [1:v:0] [2:v:0] [2:a:0] [3:v:0] [4:v:0] [4:a:0] [5:v:0] [6:v:0] [6:a:0] [7:v:0] concat=n=8:v=1:a=1 [v] [a].

  The full output is :

  ffmpeg version N-77213-g7c1c453 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (Raspbian 4.9.2-10)
  
    configuration: --enable-shared --enable-gpl --prefix=/usr --enable-nonfree --enable-libmp3lame --enable-libfaac --enable-libx264 --enable-version3 --disable-mmx
  
    libavutil      55. 10.100 / 55. 10.100
  
    libavcodec     57. 17.100 / 57. 17.100
  
    libavformat    57. 20.100 / 57. 20.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 20.100 /  6. 20.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0xc2e900] Auto-inserting h264_mp4toannexb bitstream filter
  
  Input #0, concat, from '/usr/sleeptalk/records-rendered/3enguzpuu2gw0ogk8wkko/videos.txt':
  
    Duration: N/A, start: 0.000000, bitrate: 61 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 58 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Invalid file index 1 in filtergraph description [0:v:0] [1:v:0] [2:v:0] [2:a:0] [3:v:0] [4:v:0] [4:a:0] [5:v:0] [6:v:0] [6:a:0] [7:v:0] concat=n=8:v=1:a=1 [v] [a].

  I also wrote a test case so you can reproduce this on your local machine. Download the files from my dropbox. Also, the full script that renders the "final move" can be found here.

  Would be great to get an Idea, got struggle to fix this the last two days.

• ffmepg Low latency destkop mirroring with quicksync

  21 février 2016, par Alan Aasmaa

  I have tried to figure out long time how can i stream my Main PC to Secondary PC.

  I’d like to use QuickSync or NVENC
  https://github.com/illuspas/ffmpeg-hw-win32 ?

  I found something like this.
  ffmpeg \
  -f x11grab -s 1280x720 -framerate 60 -i :0.0 \
  -c:v mpeg2video -q:v 20 -pix_fmt yuv420p -g 1 -threads 2 \
  -f mpegts - | nc -l -p 9000

  I know x11grab is for linux so i should use dshow ?

  What would be best client to watch this ? I need also low CPU usage.

  Right now i got best latency 0.5sec by Streaming with action and reciving with vMix (I use vMix becose i stream back into OBS).

  My purpose is to Get CSGO from one PC to another and do a PiP stream. I don’t have capturecard and i dont have streaming PC. Also i don’t have money to buy neither of these.

• SWAY at RFWS using Coviu

  14 février 2016, par silvia

  A SWAY session by Joanne of Royal Far West School. http://sway.org.au/ via https://coviu.com/ SWAY is an oral language and literacy program based on Aboriginal knowledge, culture and stories. It has been developed by Educators, Aboriginal Education Officers and Speech Pathologists at the Royal Far West School in Manly, NSW.

  Category : Array
  Uploaded by : Silvia Pfeiffer
  Hosted : youtube