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• Windows : can't generate libx264.dll because MinGW : not c compiler found

  21 avril 2015, par Sandie C

  It’s my first post in a forum ever (and in english...) Any suggestion is welcomed.

  So let’s started !

  My global goal is to recorder/transcoding and dispay an IP Camera stream from a .bat whitch calling vlc. (I tried before doing it with VLC interface and it’s going well. I don’t understand why the encoder is missing using that way)

  I want an asf container containing h264 and aac.

  ---

  .bat :

  cd C :\Program Files (x86)\VideoLAN\VLC

  vlc rtsp ://root:root@ip_adresse/media.amp —sout "#transcode vcodec=x264, vb=112 , acodec==aac, fps=25:duplicatedst=display,dst=standardaccess=file,mux = asf,dst=flux.asf" -v

  ---

  when I first execute this, VLC told me that H264 encoder was not found, so I decided to compile x264.

  I used this link

  http://www.ayobamiadewole.com/Blog/How-to-build-x264-or-libx264.dll-in-Windows

  I succeed to make the .exe but and when I got to

  ./configure —disable-cli —enable-shared —extra-ldflags=-Wl,—output-def=libx264.def

  minGW shell indicates : not working c compiler found

  I tried to find some answer, but i didn’t found a good one.

  Does anyone have an idea of what i’m doing wrong ?

  Is it possible that my gcc (4.6) is not the good one ? What should I do ?

  Need another advice :
  When I would have this libx264.ddl where should I put it to make my script working ?

  Early thanks for your answers.

• Synchronize raspicam video and arecord for ffmpeg rtmp streaming

  6 mars 2017, par Роман Мальцев

  I’m trying to synchronize video and audio from my raspicam and arecord and make rtmp stream with ffmpeg and 3g modem, but don’t know how to do that. I have tried with this code :

  raspivid -t 0 -w 1024 -h 768 -fps 25 -vf -hf -b 1000000 -v -o temp.v & arecord -f cd -D plughw:0 | ffmpeg -i temp.v -itsoffset 13.5 -i - -c:v copy -c:a libmp3lame -b:a 64k -vsync 0 -f flv rtmp://ipofmynginxserver/myapp/mystream

  and

  raspivid -t 0 -w 1024 -h 768 -fps 25 -g 60 -vf -hf -b 1000000 -v -o temp.v & arecord -f cd -D plughw:0 | ffmpeg -r 25.37 -i temp.v -itsoffset 13.5 -i - -c:v copy -c:a libmp3lame -b:a 64k -vsync 0 -async 1 -f flv rtmp://ipofmynginxserver/myapp/mystream

  At first everything is fine (because of the offset) But after connection lost for 2-4 seconds audio and video starting to play asynchronus (audio first)
  I have tried to change options vsync and async but it didn’t make sense. If I’m trying to get alsa microphone with ffmpeg I’m getting alsa buffer xrun and it doesn’t work, the only way for me is to use raspivid and arecord, how can I solve my problem ? Thanks and sorry for my English.

• ffmpeg how to convert pgs subtitles to srt

  20 mai 2015, par 8ofspades

  I’m having an issue with extracting subtitles from ffmpeg 2.6.2. I have an mkv file with 6 subtitle streams, and I would like to generate srt files for all of them. My ffprobe output for the streams is below.

      Stream #0:0(eng): Video: h264 (High), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc (default)
  
  Stream #0:1(ita): Audio: ac3, 48000 Hz, stereo, fltp, 448 kb/s (default)
  
  Stream #0:2(ita): Audio: dts (DTS), 48000 Hz, 5.0(side), fltp, 1536 kb/s
  
  Metadata:
  
    title           : Italian
  
  Stream #0:3(rus): Subtitle: subrip (default)
  
  Metadata:
  
    title           : Russian
  
  Stream #0:4(ita): Subtitle: hdmv_pgs_subtitle
  
  Metadata:
  
    title           : Italian
  
  Stream #0:5(eng): Subtitle: hdmv_pgs_subtitle
  
  Metadata:
  
    title           : English
  
  Stream #0:6(fre): Subtitle: hdmv_pgs_subtitle
  
  Metadata:
  
    title           : French
  
  Stream #0:7(ger): Subtitle: hdmv_pgs_subtitle
  
  Metadata:
  
    title           : German
  
  Stream #0:8(spa): Subtitle: hdmv_pgs_subtitle
  
  Metadata:
  
    title           : Spanish

  The russian (subrip) subtitles work fine with

  ffmpeg -i input.mkv -c:s:0 copy sub_ru.srt

  however when I try and select and of the other (pgs) subtitle streams, it ignores the stream I selected and outputs the russian (stream 0:3) subtitles.

  I’m not sure if this an issue with my ffmpeg command or the fact that the other streams are pgs.

  Thanks