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• How to burn subtitles using ffmpeg using a subtitles stream directly

  19 mars 2014, par Filimindji

  Let say I have an MKV with a video stream, an audio stream and a subtitles stream.

  I would like to burn this subtitle into my video directly from the subtitle stream.

  so far, this is my command line :

  ffmpeg.exe -i "MyMovie.mkv" -map 0:0 -map 0:1 -vf subtitles=sub.srt out.mkv

  So far so good. But, my subtitles are inside the movie and I need to extract them before. I used this :

  ffmpeg.exe -i "MyMovie.mkv" -f srt sub.srt

  But this operation is too long : 25 sec on my PC for a 2.5Go MKV. I need something faster because I need to start streaming the output to an app as soon as possible. (I did not mentioned the others command line arguments I used to achieve this streaming properly because my question is not about that.)

  I know it is not possible to get the stream directly like this :

  ffmpeg.exe -i "MyMovie.mkv" -map 0:0 -map 0:1 -vf subtitles=[0:s:0] out.mkv

  But this is something I would love.

  Do you think there is a workaround ?
  Or should I start writing my own filter ? No idea how to start.

  Can anyone help me with this ?

• avconv streaming to local server

  31 décembre 2012, par nonlinearmind

  I'm trying to stream my webcam and it's audio, but can't figure it out. I have managed to stream it successfully to bambuser.com using the following, but need to be able to view it locally. What am I doing wrong ?

  This successfully posts it to babuser :

  ffmpeg -v debug -f alsa -ac 1 -i hw:1,0 -acodec libmp3lame -itsoffset 00:00:00  
  
  -f video4linux2 -s 360x240 -i /dev/video0 -r 15 -f flv -ar 44100 
  
  rtmp://522f4133d0.fme.bambuser.com/b-fme/0bacf5bb634dbbbd52bdd99d71406dc6f362c

  I've tried the following, but get "RTMP_Connect0, failed to connect socket. 111 (Connection refused)
  rtmp ://localhost:8090/ : Operation not permitted"

  ffmpeg  -v debug  -f alsa -ac 1 -i hw:1,0 -acodec libmp3lame -itsoffset 00:00:00
  
  -f video4linux2 -s 360x240 -i /dev/video0 -r 15 -f flv -ar 44100 
  
  rtmp://localhost:8090/

  How would I change this to be able to view it from localhost ?

• ffprobe output video : png

  10 avril 2020, par mofei

  ffprobe is telling me that my video file is a png.

  



  [png_pipe @ 0x7f9ece003c00] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, png_pipe, from '1.ts':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: png, rgb24(pc), 1x1 [SAR 3779:3779 DAR 1:1], 25 tbr, 25 tbn, 25 tbc


  



  

  



  I'm a little bit confused, as it plays fine as a ts or mpeg file. But when I run ffmpeg -y -i in.ts -acodec copy -vcodec copy out.mp4 the command completes fine, but I end up with a file that can't be played. I get an alert that says "The operation could not be completed" from Quicktime, and I can't open it in Chrome or Firefox either so I know it's not an issue with Quicktime.

  



  So, this probably has to do with the video being a png video. I always thought that png was a format for images only, but here I am. Can someone give me some info on this, and how can I convert it to an mp4 ?