Recherche avancée

Sur d’autres sites (6224)

• how to reencode with ffmpeg (with limited x264)

  26 mai 2012, par sarfraz

  Until now I used this script to reencode my rips for my box (tv decoder) :

  ^_^ ( ~ ) -> cat ~/++/src/convert.sh 
  
  #! /bin/bash
  
  
  
  name=$(path -r "$1") # it gives the file name without the extension
  
  
  
  [ "$1" = *.mp4 ] && ffmpeg -i "$name".mp4 -vcodec copy -acodec copy "$name".mkv
  
  x264 --preset veryfast --tune animation --crf 18 --vf resize:720,576,16:15 -o "$name".tmp.mkv "$name".mkv
  
  mkvmerge -o "$name [freeplayer sd]".mkv "$name".tmp.mkv --no-video "$1"
  
  rm -rf "$name".tmp.mkv
  
  [ "$1" = *.mp4 ] && rm -rf "$name".mkv
  
  exit 0
  
  
  
  #EOF

  It works on my ubuntu and archlinux laptops. But it doesn’t on my desktop witch runs fedora.
  Google says that the x264 package shiped by rpmfusion doesn,t support lavf and ffms2.
  And I cannot unistall it because smplayer (witch i like) needs it.

  Ok, so I have to compile it. Google then says "you have to build ffmpeg, ffms2 tnen x264 ensuring that the flags are correctly refered." Well, didn’t work (ffms2 cannot find LIBAV - even when I am telling where - and x264 does’t configure with lavf...)

  My question is : can I use ffmpeg alone to do what my script does.
  I have ffmpeg version 0.8.11, x264 0.116.2048 59cb2eb and gcc : 4.6.1 20110804 (Red Hat 4.6.1-7)

  Any hint wound be appreciated.

  EDIT : Ok, I found that : ffmpeg -i input file -acodec copy -vcodec libx264 -preset veryfast -tune animation [that part I don’t have] output

  PS : english is not my native, plz forgive any spelling fault.

• Map streams in ffmpeg based on title (to remove language variant)

  16 octobre 2024, par MappaM

  I have a few video files with English audio track and French audio track, because the family wants French and I prefer VO. With ffmpeg I can easily filter all tracks to keep eng and fre, the problem is there are multiple french dialects, one of them being Candian (VFQ).

  


  Therefore, with the following input streams :

  


    Stream #0:1(fre): Audio: eac3, 48000 Hz, 5.1(side), fltp, 768 kb/s (default)
    Metadata:
      title           : E-AC3 VFF
  Stream #0:2(fre): Subtitle: subrip (default) (forced)
    Metadata:
      title           : FORCED VFF
  Stream #0:3(fre): Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s
    Metadata:
      title           : AC3 VFQ
  Stream #0:4(fre): Subtitle: subrip
    Metadata:
      title           : FORCED VFQ
  Stream #0:5(eng): Audio: eac3, 48000 Hz, 5.1(side), fltp, 768 kb/s
    Metadata:
      title           : E-AC3 VO


  


  The command -map 0:v: -map 0:m:language:eng -map 0:m:language:fre does not filter out anything, and I keep both audio which is wasteful. The only metadata that could be used to filter seems to be the title.

  


• ffmpeg video keep ref frame of source

  9 avril 2021, par user3449922

  I like to keep the some ref frame of source (in this case ref =1) :

  


  Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3
Format settings                          : CABAC / 1 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 1 frame
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 6 min 19 s
Bit rate                                 : 388 kb/s
Width                                    : 640 pixels
Height                                   : 480 pixels
Display aspect ratio                     : 4:3
Frame rate mode                          : Variable
Frame rate                               : 9.479 FPS
Minimum frame rate                       : 3.750 FPS
Maximum frame rate                       : 30.030 FPS
Original frame rate                      : 30.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.133
Stream size                              : 17.5 MiB (74%)
Language                                 : English
Codec configuration box                  : avcC


  


  here the output

  


     ID                                       : 1
    Format                                   : AVC
    Format/Info                              : Advanced Video Codec
    Format profile                           : High@L3
    Format settings                          : CABAC  2 Ref Frames
    Format settings, CABAC                   : Yes
    Format settings, Reference frames        : 2 frames
    Codec ID                                 : avc1
    Codec ID/Info                            : Advanced Video Coding
   


  


  the output Ref Frames are 2 , but I like to keep to 1 or directly force to 1.

  


  There is a way to do it ?

  


  Thanks !