[MEncoder-users] Help with mencoder

[JD]

Thank you very very much Jonathan.
I did not concoct the cat method myself.
I googled, and found it in a blog.
Since I know absolutely nothing about audio/video structures and algorithms,
I rely on what I find on the web.


Your suggestion is working (i.e. transcoding) as I type this reply.

BEst regards,

JD

On 03/06/2011 02:11 PM, Jonathan Busby wrote:
> 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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