Recherche avancée

Sur d’autres sites (10344)

• how to merge audio and video using ffmpeg in android

  2 août 2016, par sundaralaxman.S.P

  Actually i am going on with the split and merge of audio and video file using ffmpeg in android using below library.

  https://github.com/WritingMinds/ffmpeg-android-java

  I had splitted the audio and video each separately successfully,futher going with the process to merge of audio and video file together got stuck.Here is the link http://www.labnol.org/internet/useful-ffmpeg-commands/28490/. which i followed to merge from

  merge command :

  ffmpeg -i video.mp4 -i audio.mp3 -c:v copy -c:a aac -strict experimental -shortest output.mp4

  Below faced problem :

  The error is :

  At least one output file must be specified.

• FFMPEG GIF without loop, without transparency

  4 janvier 2019, par Wallie

  I use the following bash file in Terminal to transcode video files to high quality gifs.

  #!/bin/sh
  
  
  
  palette="/tmp/palette.png"
  
  
  
  filters="fps=25,scale=576:-1.78:flags=lanczos"
  
  
  
  ffmpeg -v warning -i $1 -vf "$filters,palettegen" -y $palette
  
  ffmpeg -v warning -i $1 -i $palette -lavfi "$filters [x]; [x][1:v] 
  
  paletteuse" -y $2

  Right now a 6 second video ends up as a 10 second gif. Which is a bit odd since the framerate matches. I guess it’s due to looping.

  Is it possible to add a simple filter that prevents looping.

  And also a filter that prevents transparency ?

  Source is a prores422 file.

• ffmpeg drops time delay on last frame of animated GIF

  13 août 2014, par Austin

  I am trying to convert animated GIFs to MP4 files using ffmpeg and x264. However, I seem be suffering from the effects of this bug in ffmpeg that causes the delay time of the last frame of the GIF to be ignored. For very short GIFs, this is quite a problem.

  As a work around, I was thinking that I should be able to manually tell ffmpeg to freeze on the last frame for a certain amount of time, specifically the proper duration of that frame (which I can extract from the GIF). However, I can’t seem to find a good way to do this. Any suggestions ? I would really like to be able to do this without having to split to the GIF into frames before putting it into ffmpeg since that will mess up GIFs with a non-constant framerate (in addition to being much slower).

  I am using ffmpeg version 2.3, though I have also tried this with the latest git code without any improvement. The full ffmpeg commands I’m using look like this :

  ffmpeg -i animation.gif -vf "scale=trunc(in_w/2)*2:trunc(in_h/2)*2" -c:v libx264 -b:v 2000k -y -pix_fmt yuv420p -f mp4 animation.mp4

  Here is some console output :

  ffmpeg version 2.3 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Aug 11 2014 21:19:46 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --enable-gpl --enable-libass --enable-libfreetype --enable-libtheora --enable-libvorbis --enable-libx264
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 48.100 / 55. 48.100
  
    libavdevice    55. 13.102 / 55. 13.102
  
    libavfilter     4. 11.100 /  4. 11.100
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, gif, from 'animation.gif':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: gif, bgra, 500x375, 100 tbr, 100 tbn, 100 tbc
  
  [libx264 @ 0x239ea00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x239ea00] profile High, level 3.1
  
  [libx264 @ 0x239ea00] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=2000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'animation.mp4':
  
    Metadata:
  
      encoder         : Lavf55.48.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 500x374, q=-1--1, 2000 kb/s, 100 fps, 12800 tbn, 100 tbc
  
      Metadata:
  
        encoder         : Lavc55.69.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (gif (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame=    7 fps=0.0 q=-1.0 Lsize=       7kB time=00:00:00.05 bitrate=1222.1kbits/s dup=5 drop=0    
  
  video:7kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 13.542441%
  
  [libx264 @ 0x239ea00] frame I:1     Avg QP:34.86  size:  3657
  
  [libx264 @ 0x239ea00] frame P:3     Avg QP:30.86  size:   744
  
  [libx264 @ 0x239ea00] frame B:3     Avg QP:33.33  size:    49
  
  [libx264 @ 0x239ea00] consecutive B-frames: 42.9%  0.0%  0.0% 57.1%
  
  [libx264 @ 0x239ea00] mb I  I16..4: 10.2% 78.3% 11.6%
  
  [libx264 @ 0x239ea00] mb P  I16..4:  1.2%  5.0%  0.8%  P16..4: 11.7%  3.3%  1.2%  0.0%  0.0%    skip:76.8%
  
  [libx264 @ 0x239ea00] mb B  I16..4:  0.0%  0.1%  0.0%  B16..8:  3.7%  0.0%  0.0%  direct: 0.0%  skip:96.2%  L0:23.5% L1:76.5% BI: 0.0%
  
  [libx264 @ 0x239ea00] final ratefactor: 20.31
  
  [libx264 @ 0x239ea00] 8x8 transform intra:77.0% inter:79.4%
  
  [libx264 @ 0x239ea00] coded y,uvDC,uvAC intra: 39.5% 0.0% 0.0% inter: 2.7% 0.0% 0.0%
  
  [libx264 @ 0x239ea00] i16 v,h,dc,p: 38% 27%  7% 28%
  
  [libx264 @ 0x239ea00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 35% 12% 13%  7%  6% 10%  4%  8%  5%
  
  [libx264 @ 0x239ea00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 38% 11% 14%  5%  8% 10%  5%  7%  2%
  
  [libx264 @ 0x239ea00] i8c dc,h,v,p: 100%  0%  0%  0%
  
  [libx264 @ 0x239ea00] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x239ea00] ref P L0: 99.1%  0.7%  0.3%
  
  [libx264 @ 0x239ea00] ref B L0: 85.0% 15.0%
  
  [libx264 @ 0x239ea00] ref B L1: 95.4%  4.6%
  
  [libx264 @ 0x239ea00] kb/s:689.83