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• C# : get web camera name for FFmpeg

  16 avril 2013, par JustLogin

  In my C# app I'm using FFmpeg to stream desktop and it works fine. I also want FFmpeg to publish video from web camera. The problem is, that when I use desktop as input, device name parameter is already known (-i video=UScreenCapture), but it's not when I want to use web camera and microphone. So, my question is, how to get web camera and microphone names using C#.

• ffmpeg metadata, multiline text into comment field

  15 avril 2013, par decss

  my question is next : i use ffmpeg to update metadata tags like this way

  ffmpeg -i "in.m4a" -acodec copy -metadata artist="artist text"
  
  -metadata comment="comment text" "out.m4a"

  Well, "artist text" and "comment text" is usual plain text, but comment field allow to put multiline text. Each line must have new line character to do it. Something like this :

  -metadata comment="source: lastfm \r\n tags: tag1, tag2 \r\n ..."

  But all characters that i use (\r\n, %nl%, ^N) brings no result

  So i have no idea how to put multiline text into a comment field via ffmpeg
  Hope you will help me : ) Thanks !

• Truly live streaming to Android/iPhone

  4 juillet 2012, par Tsaukpaetra

  I have spent quite a while (past week) trying this to little avail. However, what I want seems completely unheard of. So far, I have reviewed recommendations available through google, which include encoding a static file into multiple static files in different formats, creating a playlist that hosts static files in an m3u8 file (files which get added to the playlist as streaming continues).
  I have also seen ideas involving rtmp, rtsp etc which are completely out of the question because of their incompatibility.
  Ideally, I would have one webpage that would link to the stream (http://server/video.mp4) and/or show it in a webpage (via the video tag). With that in mind, the most likely format would be h264+aac in mp4 container.

  Unfortunately, (and probably because the file has no duration metadata) it does not work. I can use a desktop player (such as VLC) to open the stream and play it, but my iPhone and Android both give their respective "Can't be played" messages.

  I don't think the problem is caused by the devices' ability to stream, for I have made a streaming shoutcast server work just fine (mp3 only).

  Currently, the closest I have become is using the following setup on my win32 machine :

  FFMPEG Command: : ffmpeg -f dshow -i video="Logitech Webcam 200":audio="Microphone (Webcam 200)" -b:v 180k -bt 240k -vcodec libx264 -tune zerolatency -profile:v baseline -preset ultrafast -r 10 -strict -2 -acodec aac -ac 2 -ar 48000 -ab 32k -f flv "udp ://127.0.0.1:1234"

  VLC: : Stream from udp ://127.0.0.1:1234 to http:// :8080/video.mp4 (No Transcoding), basically just to convert the UDP stream into an http-accessible stream.

  Any hints or suggestions would be warmly welcomed !