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• ffmpeg : images to 29.97fps mpeg2, audio not sync [migrated]

  21 novembre 2011, par Andy Le

  I have spent a lot of time on this issue. Hope someone can help.

  I want to convert 3147 images + ac3 audio file into an mpeg2 video at 29.97fps (about 1m45s). My command :

  ~/ffmpeg/ffmpeg/ffmpeg -loop_input -t 105 -i v%4d.tga -i final.ac3 -vcodec mpeg2video -qscale 1 -s 400x400 -r 30000/1001 -acodec copy -y out.mpeg 2> out.txt

  However, the audio file ends before the frame sequence. Which means the video is slower then audio.

  I checked the output file with imageinfo and see :

  General
  
  Complete name                    : out.mpeg
  
  Format                           : MPEG-PS
  
  File size                        : 7.18 MiB
  
  Duration                         : 1mn 44s
  
  Overall bit rate                 : 574 Kbps
  
  
  
  Video
  
  ID                               : 224 (0xE0)
  
  Format                           : MPEG Video
  
  Format version                   : Version 2
  
  Format profile                   : Main@Main
  
  Format settings, BVOP            : No
  
  Format settings, Matrix          : Default
  
  Format_Settings_GOP              : M=1, N=12
  
  Duration                         : 1mn 44s
  
  Bit rate mode                    : Variable
  
  Bit rate                         : 103 Kbps
  
  Width                            : 400 pixels
  
  Height                           : 400 pixels
  
  Display aspect ratio             : 1.000
  
  Frame rate                       : 29.970 fps
  
  Resolution                       : 8 bits
  
  Colorimetry                      : 4:2:0
  
  Scan type                        : Progressive
  
  Bits/(Pixel*Frame)               : 0.021
  
  Stream size                      : 1.29 MiB (18%)
  
  
  
  Audio
  
  ID                               : 128 (0x80)
  
  Format                           : AC-3
  
  Format/Info                      : Audio Coding 3
  
  Duration                         : 1mn 44s
  
  Bit rate mode                    : Constant
  
  Bit rate                         : 448 Kbps
  
  Channel(s)                       : 6 channels
  
  Channel positions                : Front: L C R, Side: L R, LFE
  
  Sampling rate                    : 44.1 KHz
  
  Stream size                      : 5.61 MiB (78%)

  The log from ffmpeg shows many duplicate frames. But I don't know how to get rid of that.

  -loop_input is deprecated, use -loop 1
  
  [image2 @ 0x9c17a80] max_analyze_duration 5000000 reached at 5000000
  
  Input #0, image2, from 'v%4d.tga':
  
    Duration: 00:02:05.88, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: targa, bgr24, 400x400, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  -loop_input is deprecated, use -loop 1
  
  [ac3 @ 0x9ca5420] max_analyze_duration 5000000 reached at 5014400
  
  [ac3 @ 0x9ca5420] Estimating duration from bitrate, this may be inaccurate
  
  Input #1, ac3, from 'Final.ac3':
  
    Duration: 00:20:10.68, start: 0.000000, bitrate: 447 kb/s
  
      Stream #1:0: Audio: ac3, 44100 Hz, 5.1(side), s16, 448 kb/s
  
  Incompatible pixel format 'bgr24' for codec 'mpeg2video', auto-selecting format 'yuv420p'
  
  [buffer @ 0x9c1e060] w:400 h:400 pixfmt:bgr24 tb:1/1000000 sar:0/1 sws_param:
  
  [buffersink @ 0x9dd56c0] auto-inserting filter 'auto-inserted scale 0' between the filter 'src' and the filter 'out'
  
  [scale @ 0x9c178e0] w:400 h:400 fmt:bgr24 -> w:400 h:400 fmt:yuv420p flags:0x4
  
  [mpeg @ 0x9d58060] VBV buffer size not set, muxing may fail
  
  Output #0, mpeg, to 'out.mpeg':
  
    Metadata:
  
      encoder         : Lavf53.21.0
  
      Stream #0:0: Video: mpeg2video, yuv420p, 400x400, q=2-31, 200 kb/s, 90k tbn, 29.97 tbc
  
      Stream #0:1: Audio: ac3, 44100 Hz, 5.1(side), 448 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (targa -> mpeg2video)
  
    Stream #1:0 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=  267 fps=  0 q=1.0 size=     564kB time=00:00:08.87 bitrate= 520.6kbits/s dup=43 drop=0    
  
  frame=  544 fps=542 q=1.0 size=    1186kB time=00:00:18.11 bitrate= 536.2kbits/s dup=89 drop=0    
  
  frame=  821 fps=546 q=1.0 size=    1818kB time=00:00:27.36 bitrate= 544.3kbits/s dup=135 drop=0    
  
  frame= 1098 fps=548 q=1.0 size=    2444kB time=00:00:36.60 bitrate= 547.0kbits/s dup=181 drop=0    
  
  frame= 1376 fps=549 q=1.0 size=    3072kB time=00:00:45.87 bitrate= 548.5kbits/s dup=227 drop=0    
  
  frame= 1653 fps=550 q=1.0 size=    3700kB time=00:00:55.12 bitrate= 549.9kbits/s dup=273 drop=0    
  
  frame= 1930 fps=550 q=1.0 size=    4326kB time=00:01:04.36 bitrate= 550.6kbits/s dup=319 drop=0    
  
  frame= 2208 fps=551 q=1.0 size=    4960kB time=00:01:13.64 bitrate= 551.8kbits/s dup=365 drop=0    
  
  frame= 2462 fps=546 q=1.0 size=    5746kB time=00:01:22.11 bitrate= 573.2kbits/s dup=407 drop=0    
  
  frame= 2728 fps=544 q=1.0 size=    6354kB time=00:01:30.99 bitrate= 572.1kbits/s dup=451 drop=0    
  
  frame= 3007 fps=545 q=1.0 size=    6980kB time=00:01:40.28 bitrate= 570.2kbits/s dup=498 drop=0    
  
  frame= 3146 fps=546 q=1.0 Lsize=    7352kB time=00:01:44.93 bitrate= 573.9kbits/s dup=521 drop=0    
  
  
  
  video:1518kB audio:5745kB global headers:0kB muxing overhead 1.230493%

• Use ffmpeg to watermark and scale an image on video

  11 mai 2015, par Ae.

  I want to be able to watermark videos with a logo image, which contains a website url.
  The videos can be of different formats and dimension.
  I’m trying to figure out a generic ffmpeg command to achieve it, so that i don’t have to tweak the command depending on the video i have to process.
  So far i got :

  ffmpeg -i sample.mov -sameq -acodec copy -vf 'movie=logo.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:main_h-overlay_h-10 [out]' sample2.mov

  In this way though the logo will look too big or too small with video of different size.
  I’ve seen there is a scale option for avfilter, but I haven’t figure out whether it’s possible to resize the image logo based on the dimension of the input video, so that I can say to scale the logo to 1/3 of the video length for example, and keep the image ratio.

  Any idea ? doesn’t need to be done in a single command, could even be a script.
  thanks in advance.

• ffmpeg resize down larger video to fit desired size and add padding

  5 février 2017, par misterjinx

  I’m trying to resize a larger video to fit an area that I have. In order to achieve this I calculate first the dimensions of the resized video so That it fits my area, and then I try to add padding to this video so that the final result will have the desired dimension, keeping the aspect ratio as well.

  So let’s say that I have the original video dimensions of 1280x720 and to fit my area of 405x320 I need first to resize the video to 405x227. I do that. Everything is fine at this point. I do some math and I find out that I have to add 46 pixels of padding at the top and the bottom.

  So the padding parameter of the command for that would be -vf "pad=405:320:0:46:black". But each time I run the command I get an error like Input area 0:46:405:273 not within the padded area 0:0:404:226.

  The only docs for padding that I found is this http://ffmpeg.org/libavfilter.html#pad.

  I don’t know what I’m doing wrong. Anyone had this problem before ? Do you have any suggestions ?