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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%
  

• WebM Encoded file plays in Chrome but not FFv6 HTML5-Video

  21 novembre 2011, par Austin S

  I'm trying to use the new fancy html5 video player element and I was wondering: I encoded a high resolution .mov container in VLC v1.1.9 to WebM format (although an FFMPEG command line would be extremely valuable if you have one handy) and it plays just fine in Chrome, but it won't open in Firefox. Would anyone have any ideas or in what direction I should be looking?

• ffmpeg assert - throw exception instead of abort

  21 novembre 2011, par ronag

  I'm using ffmpeg in my C++ application.

  When trying to play certain files an assertion inside of ffmpeg fails, which causes it to call abort() which terminates my application. I do not want this behavior, rather I want to get the chance to recover, preferably through an exception.

  Anyone got any ideas as to how I can get around the problem with ffmpeg/assert potentially terminating my application?

  EDIT:

  The only way I can think of right now is to change the ffmpeg assert macro so that it causes an access violation which I can catch through SEH exceptions. Ugly and potentially bad solution?

• error:initializer element is not constant [closed]

  21 novembre 2011, par lqf

  I have downloaded ffmpeg's source code from 'www.ffmpeg.org' and created am empty project with ubuntu.Then I'm copied and added the ffmpeg's source code to the project.There are some errors when I compile it.

  The errors are:xxx error:initializer element is not constant xxx error:(near initializer for 'ff_eightbps_decoder.long_name') and appeared at ".long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),"

• How to convert .mov videos to iPhone playable mp4 videos [migrated]

  21 novembre 2011, par Rinto George

  I am trying to convert .mov videos to mp4(should be playable in iPhone) using ffmpeg.I am using Linux CLI. I have tried the following command:

  -i source.MOV -s qvga -b 384k -vcodec libx264 -r 23.976 -acodec libfaac -ac 2 -ar 44100 -ab 64k -vpre baseline -crf 22 -deinterlace -o output.mp4 
  

  I get the output

  ffmpeg: unrecognized option '-o'