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• 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 !

• use java-ffmpeg wrapper, or simply use java runtime to execute ffmpeg ?

  12 mars 2017, par user156153

  I’m pretty new to Java, need to write a program that listen to video conversion instructions and convert the video once an new instruction arrives (instructions is stored in Amazon SQS, but it’s irrelevant to my question)

  I’m facing a choice, either use Java RunTime to exec ’ffmpeg’ conversion (like from command line), or I can use a ffmpeg wrapper written inJava http://fmj-sf.net/ffmpeg-java/getting_started.php

  I’d much prefer using Java Runtime to exec ffmpeg directly, and avoid using java-ffmpeg wrapper as I have to learn the library. so my question is are there any benefits using java-ffmpeg wrapper over exec ffmpeg directly using Runtime ? I don’t need ffmpeg to play videos, just convert videos

  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 !