[MEncoder-users] Help with mencoder

[Jonathan Busby]

You can't use the text based "cat" command to combine structured binary
video files -- it just doesn't work that way.
You have to re-encode (transcode) your source videos into a new video.

Here is an example that would work for you :

mencoder Zachar*.flv -ovc x264 -x264encopts crf=18 -oac mp3lame -lameopts
preset=insane -o Zach_all.avi


Jonathan



On Sat, Mar 5, 2011 at 3:09 PM, JD <jd1008 at gmail.com> wrote:

> Hi,
> I wanted to combine 12 flash video files (from youtube)
> into a single avi file.
> So I did
>
> cat at Zachar*.flv > Zach_all.flv
>
> $ mencoder Zach_all.flv -o Zach_all.avi -forceidx -ovc copy -oac pcm
>
> The output shows skipping frames, and
> missing aspect information, as you see below.
>
> What do I need to do to fix that, so thet when I am transcoding into .avi,
> I do not get these skips and missing aspect info?
>
>
>
> MEncoder SVN-r31628-4.4.5 (C) 2000-2010 MPlayer Team
> success: format: 0  data: 0x0 - 0x8378f0a
> libavformat file format detected.
> [flv @ 0x92d07a0] Estimating duration from bitrate, this may be inaccurate
> [lavf] stream 0: video (h264), -vid 0
> [lavf] stream 1: audio (aac), -aid 0
> VIDEO:  [H264]  480x270  0bpp  29.917 fps  119.2 kbps (14.5 kbyte/s)
> [V] filefmt:44  fourcc:0x34363248  size:480x270  fps:29.917  ftime:=0.0334
> ==========================================================================
> Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding)
> AUDIO: 44100 Hz, 2 ch, s16le, 49.5 kbit/3.51% (ratio: 6184->176400)
> Selected audio codec: [faad] afm: faad (FAAD AAC (MPEG-2/MPEG-4 Audio))
> ==========================================================================
> videocodec: framecopy (480x270 0bpp fourcc=34363248)
> Writing header...
> ODML: Aspect information not (yet?) available or unspecified, not writing
> vprp header.
> Writing header...
> ODML: Aspect information not (yet?) available or unspecified, not writing
> vprp header.
> Pos:   0.7s     21f ( 0%) 14.38fps Trem:   0min   0mb  A-V:0.067 [0:1411]
> Skipping frame!
> Pos:   1.1s     33f ( 0%) 18.45fps Trem:   0min   0mb  A-V:0.068 [150:1411]
> Skipping frame!
> Pos:   6.0s    182f ( 0%) 38.81fps Trem:  65min 1014mb  A-V:0.067
> [148:1411]
> Skipping frame!
> Pos:  23.5s    706f ( 0%) 43.90fps Trem:  70min 1142mb  A-V:0.067
> [106:1411]
> Skipping frame!
> Pos:  38.4s   1153f ( 0%) 44.83fps Trem:  68min 1147mb  A-V:0.067
> [113:1411]
> Skipping frame!
> Pos:  57.4s   1723f ( 0%) 44.84fps Trem:  66min 1117mb  A-V:0.068
> [124:1411]
> Skipping frame!
> Pos:  76.9s   2306f ( 1%) 44.36fps Trem:  65min 1089mb  A-V:0.067
> [128:1411]
> Skipping frame!
> Pos:  98.4s   2950f ( 1%) 44.17fps Trem:  65min 1092mb  A-V:0.067
> [126:1411]
> Skipping frame!
> Pos: 117.5s   3522f ( 1%) 43.68fps Trem:  65min 1086mb  A-V:0.067
> [128:1411]
> Skipping frame!
> Pos: 132.5s   3972f ( 2%) 43.76fps Trem:  66min 1092mb  A-V:0.067
> [127:1411]
> Skipping frame!
> Pos: 153.7s   4608f ( 2%) 44.14fps Trem:  66min 1104mb  A-V:0.067
> [126:1411]
> Skipping frame!
> Pos: 173.1s   5190f ( 2%) 43.84fps Trem:  68min 1133mb  A-V:0.067
> [120:1411]
> Skipping frame!
> Pos: 190.3s   5705f ( 3%) 44.08fps Trem:  67min 1122mb  A-V:0.067
> [121:1411]
> Skipping frame!
> Pos: 211.7s   6347f ( 3%) 43.80fps Trem:  66min 1114mb  A-V:0.068
> [124:1411]
> Skipping frame!
> Pos: 228.7s   6856f ( 3%) 43.84fps Trem:  66min 1113mb  A-V:0.067
> [124:1411]
> Skipping frame!
> Pos: 248.1s   7436f ( 4%) 44.06fps Trem:  65min 1110mb  A-V:0.067
> [125:1411]
> Skipping frame!
> Pos: 265.3s   7954f ( 4%) 43.82fps Trem:  66min 1120mb  A-V:0.067
> [123:1411]
> Skipping frame!
>
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