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• creating illusion of live streaming (internet radio) using ffmpeg

  29 décembre 2014, par user259060

  I am working on a project that involves live streaming but without seeking (just like internet radio). I am using ffmpeg and ffserver.

  • I could just send the song to ffserver feed using ffmpeg but the problem is that the whole song / file is getting dumped. I don’t want that to happen.

  • First I segmented the song using ffmpeg -threads 1 -i INPUT.mp3 -ar 24000 -acodec libmp3lame -ac 1 -aq 1 -ab 64k -map 0:0 -f segment -segment_time 2 -segment_list /PATH/TO/LIST/outputlist.m3u8 -segment_format mpegts /OUTPUT/PATH/output%05d.mp3 (this is just an example) .

  • As you can see that the segment time is 2 seconds. What I’m actually planning to achieve is that I want to send first segmented file say output00001.mp3 to ffserver feed and wait for 1 second then send the the second segmented files say output00002.mp3 to ffserver feed and so on till the end of the song. This creates an illusion of radio live streaming. I was able to implement this without a problem using python.

  PROBLEM :

  The problem I faced while listening to song (htttp ://foo:port/test1.mp3) is that after 2nd second I hear a few millisecond pause and then the song continues to play which is very irritating. This happens after every segmented song completes playing. Is there any solution to eradicate the pause ? Is there a technique to make song play live (that means if my server shuts down, the song should stop immediately) ?

• Splitting up a variable in bash

  17 décembre 2015, par bs7280

  I have a bunch of songs that I have downloaded that I am trying to convert to .mp3 and rename. After converting the .m4a file to mp3 with ffmpeg, they are all in the format of Artist Name - Song Name.mp3. I want to be able to separate the Song name and Artist name into their own variables, so I can rename the file and tag the songs with the song name and artist name.

  So, How can I separate a variable into two variables, each respectively containing the artist name and song name, where the two pieces of information is separated by a ’ - ’ in bash ?

• How to make ffmpeg respect the "start_time" variable when combining cdg and mp3 ?

  5 juillet 2020, par Steffen Poulsen

  I'm trying to combine two .cdg and .mp3 files because I want to make a single .mkv file out of them.

  



  When I do it I get a .mkv file alright, but the audio is unfortunately not synced with the video.

  



  So, I was wondering why this is ? Apparently I must be missing a parameter on my command or something.

  



  What I do is this :

  



  ffmpeg -y -i song.cdg -i song.mp3 -pix_fmt yuv420p -vcodec libx264 -acodec copy song.mkv


  



  It works fine, but in this particular case the result is out of sync by 1.2 seconds. This varies per song, from 0 to a couple of seconds.

  



  However, if I do a ffprobe on the .cdg file I notice that this number is already present, as the "start_time" variable :

  



  ffprobe -v error -show_format -show_streams song.cdg
...
start_time=1.186667
...


  



  So, if I just use this number directly as this for the -itsoffset parameter :

  



  ffmpeg -y -itsoffset 1.186667 -i song.cdg -i song.mp3 -pix_fmt yuv420p -vcodec libx264 -acodec copy song.mkv


  



  Then the video and audio is in perfect sync.

  



  So, I am wondering - what parameter do I need to add to my command to have ffmpeg respect this variable ?