[MEncoder-users] duplicate frames - shortening video?

[hans at netupgrades.com]

Hi Steven and thanks for the help!

Steven Miller <srmj.ml at gmail.com> wrote:

> Have you tested the source? Is all well on that end?

Yes - the source scrolls fine.

>  Couple of things,
> 
>      What is the source video codec?

Ogg vorbis?

>      Is the video  and or audio cbr or vbr or a mix (if mixing the
> two is even possible).

I am not sure on this. I have posted info from mencoder below.

>      Are you sure on the frame rate?

I am not sure, but I have tried different frame rates w/ no difference.

>      Is it telecene? If so I believe there are instances where
> attempting to set the frame rate could be ignored during encoding
> without addressing the telecine.
>      If it were telecine, a filter combo something like '-vf
> pullup,softskip,harddup' would be needed.

I dont think it is telecine.

> I see your recompressing audio. Going from mp3 to mp3. Perhaps you
> can use '-oac copy' for the encoding portion. Then using mplayer go
> back to the original source file, '-ao pcm:waveheader:file=foo.wav'.
> Once you have your wav file, use lame to rencode the audio.
> 
> Demux the video using the tool(s) of choice. Then remux the video and
> audio.
> 
> A very round about way to do it, but it's worked for me a number of
> times.
> 
> Either way I'm betting '-ofps' will most likely be needed to address
> the 'Duplicate Frame' messages.

Yes - I have just tried that, too.

> Again, I apologize if I've missed a resolution or am asking already
> answered questions.

No problem - Here is what I wrote to Lobster answering his questions.

Ive included the source files.

Thank you very much for helping Steven! :)  --Hans

From: <hans at netupgrades.com>
To: Lobster <lobo at lobs.sytes.net>
Subject: Re: [MEncoder-users] duplicate frames - shortening video?
Date: Wed, 6 Jun 2012 00:13:21 -0500
X-Mailer: Claws Mail 3.8.0 (GTK+ 2.24.10; i486-pc-linux-gnu)

Hey Lobster,

Thanks for the help. Big thanks! :)

I just did a new test from a different, but similar out.ogv and got the
same sort of shortening frames effect when processed through mencoder.

Below I have pasted the command you just asked me to try > dev/null

Below that I have pasted the results of the mencoder command you
initially gave to me w/ the ofps flag.

Also, I have posted both the source and the mencoded test.avi online.

[...]

Here are the vids online:

http://nukene.ws/sites/nukene.ws/files/out.ogv
http://nukene.ws/sites/nukene.ws/files/test.avi
http://nukene.ws/sites/nukene.ws/files/breathe-out_alpha.mp3

Very kind of you and much appreciated, Lobster. 

I like mencoder a lot! :)   --Hans


mencoder -ovc copy -nosound -o /dev/null out.ogv
MEncoder svn r34540 (Debian), built with gcc-4.7 (C) 2000-2012 MPlayer
Team success: format: 0  data: 0x0 - 0x4d725c
libavformat version 53.21.0 (external)
Mismatching header version 53.19.0
libavformat file format detected.
[ogg @ 0xb6b8efa0]max_analyze_duration reached
[lavf] stream 1: video (theora), -vid 0
VIDEO:  [theo]  1376x816  0bpp  15.000 fps    0.0 kbps ( 0.0 kbyte/s)
[V] filefmt:44  fourcc:0x6F656874  size:1376x816  fps:15.000
ftime:=0.0667 videocodec: framecopy (1376x816 0bpp fourcc=6f656874)
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:  24.3s    365f (100%)  0.00fps Trem:   0min
4mb  A-V:0.000 [1663:0] Writing index...
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not
writing vprp header.

Video stream: 1659.014 kbit/s  (207376 B/s)  size: 5046167 bytes
24.333 secs  365 frames

====
Command line logging of original mencoder run:

mencoder out.ogv -audiofile audio/breathe-out_alpha.mp3 -ovc lavc -oac
mp3lame -vf harddup -ofps 15 -o test.avi MEncoder svn r34540 (Debian),
built with gcc-4.7 (C) 2000-2012 MPlayer Team success: format: 0  data:
0x0 - 0x4d725c libavformat version 53.21.0 (external)
Mismatching header version 53.19.0
libavformat file format detected.
[ogg @ 0xb6b73fa0]max_analyze_duration reached
[lavf] stream 1: video (theora), -vid 0
VIDEO:  [theo]  1376x816  0bpp  15.000 fps    0.0 kbps ( 0.0 kbyte/s)
Audio only file format detected.
BUG! Invalid demuxer type in new_demuxer(), big troubles ahead.[V]
filefmt:65536  fourcc:0x6F656874  size:1376x816  fps:15.000
ftime:=0.0667
==========================================================================
Requested audio codec family [mpg123] (afm=mpg123) not available.
Enable it at compilation. Opening audio decoder: [ffmpeg]
FFmpeg/libavcodec audio decoders libavcodec version 53.35.0 (external)
Mismatching header version 53.32.2 AUDIO: 44100 Hz, 2 ch, floatle,
192.0 kbit/6.80% (ratio: 24000->352800) Selected audio codec:
[ffmp3float] afm: ffmpeg (FFmpeg MPEG layer-3 audio)
==========================================================================
Opening video filter: [expand osd=1] Expand: -1 x -1, -1 ; -1, osd: 1,
aspect: 0.000000, round: 1 Opening video filter: [harddup]
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [fftheora] vfm: ffmpeg (FFmpeg Theora)
==========================================================================
MP3 audio selected.
Movie-Aspect is 1.69:1 - prescaling to correct movie aspect.
videocodec: libavcodec (1376x816 fourcc=34504d46 [FMP4])
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:   0.1s      2f (17%)  0.00fps Trem:   0min
0mb  A-V:0.007 [0:0] [VD_FFMPEG] DRI failure.
Pos:   5.1s     76f (17%)  6.45fps Trem:   0min   7mb  A-V:-0.138
[1967:205]

1 duplicate frame(s)!
Pos:   5.8s     86f (20%)  6.07fps Trem:   0min   7mb  A-V:-0.138
[2020:207]

1 duplicate frame(s)!
Pos:   6.5s     96f (23%)  5.85fps Trem:   0min   7mb  A-V:-0.138
[1918:210]

1 duplicate frame(s)!
Pos:   7.3s    106f (26%)  5.76fps Trem:   0min   6mb  A-V:-0.138
[1763:211]

1 duplicate frame(s)!
Pos:   8.0s    116f (28%)  5.63fps Trem:   0min   6mb  A-V:-0.138
[1646:213]

1 duplicate frame(s)!
Pos:   8.7s    126f (30%)  5.60fps Trem:   0min   6mb  A-V:-0.138
[1571:213]

1 duplicate frame(s)!
Pos:   9.5s    136f (34%)  5.62fps Trem:   0min   5mb  A-V:-0.138
[1504:214]

1 duplicate frame(s)!
Pos:  10.2s    146f (36%)  5.74fps Trem:   0min   5mb  A-V:-0.138
[1448:212]

1 duplicate frame(s)!
Pos:  10.9s    156f (37%)  5.88fps Trem:   0min   5mb  A-V:-0.138
[1392:210]

1 duplicate frame(s)!
Pos:  11.7s    166f (40%)  5.88fps Trem:   0min   5mb  A-V:-0.138
[1345:208]

1 duplicate frame(s)!
Pos:  12.4s    176f (43%)  5.81fps Trem:   0min   5mb  A-V:-0.138
[1313:207]

1 duplicate frame(s)!
Pos:  13.1s    186f (44%)  5.79fps Trem:   0min   5mb  A-V:-0.138
[1266:205]

1 duplicate frame(s)!
Pos:  13.9s    196f (44%)  5.80fps Trem:   0min   5mb  A-V:-0.138
[1207:204]

1 duplicate frame(s)!
Pos:  14.6s    206f (44%)  5.93fps Trem:   0min   5mb  A-V:-0.138
[1153:202]

1 duplicate frame(s)!
Pos:  15.3s    216f (45%)  5.93fps Trem:   0min   5mb  A-V:-0.138
[1120:201]

1 duplicate frame(s)!
Pos:  16.1s    226f (46%)  5.98fps Trem:   0min   5mb  A-V:-0.138
[1104:201]

1 duplicate frame(s)!
Pos:  16.8s    236f (49%)  6.09fps Trem:   0min   5mb  A-V:-0.138
[1143:202]

1 duplicate frame(s)!
Pos:  17.5s    246f (53%)  6.08fps Trem:   0min   5mb  A-V:-0.138
[1147:203]

1 duplicate frame(s)!
Pos:  18.3s    256f (58%)  6.08fps Trem:   0min   5mb  A-V:-0.138
[1175:203]

1 duplicate frame(s)!
Pos:  19.0s    266f (62%)  6.14fps Trem:   0min   5mb  A-V:-0.138
[1168:203]

1 duplicate frame(s)!
Pos:  19.7s    276f (67%)  6.17fps Trem:   0min   4mb  A-V:-0.138
[1177:202]

1 duplicate frame(s)!
Pos:  20.5s    286f (70%)  6.17fps Trem:   0min   4mb  A-V:-0.138
[1146:202]

1 duplicate frame(s)!
Pos:  21.2s    296f (76%)  6.12fps Trem:   0min   4mb  A-V:-0.138
[1146:201]

1 duplicate frame(s)!
Pos:  21.9s    306f (80%)  6.11fps Trem:   0min   4mb  A-V:-0.138
[1125:201]

1 duplicate frame(s)!
Pos:  22.7s    316f (86%)  6.03fps Trem:   0min   4mb  A-V:-0.138
[1124:201]

1 duplicate frame(s)!
Pos:  23.4s    326f (87%)  6.02fps Trem:   0min   4mb  A-V:-0.138
[1093:201]

1 duplicate frame(s)!
Pos:  24.1s    336f (91%)  5.97fps Trem:   0min   4mb  A-V:-0.138
[1083:202]

1 duplicate frame(s)!
Pos:  24.9s    346f (93%)  5.94fps Trem:   0min   4mb  A-V:-0.138
[1068:203]

1 duplicate frame(s)!
Pos:  25.6s    356f (97%)  5.90fps Trem:   0min   4mb  A-V:-0.138
[1067:203]

1 duplicate frame(s)!
Pos:  26.3s    365f (100%)  5.87fps Trem:   0min   3mb  A-V:-0.131
[1059:203]

Flushing video frames.
Writing index...
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not
writing vprp header.

Video stream: 1059.505 kbit/s  (132438 B/s)  size: 3478709 bytes
26.267 secs  365 frames

Audio stream:  204.025 kbit/s  (25503 B/s)  size: 682858 bytes  26.776
secs

> Steve
> On Jun 4, 2012 11:24 PM, <hans at netupgrades.com> wrote:
> 
> > Thanks Lobster.
> >
> > Still I am getting a video of very fast scrolling down the page as
> > if mencoder has discarded these long scroll pauses as duplicates and
> > optimized the video by removing the duplicates.
> >
> > Anything else to try to preserve all the frames in the source vid?
> >
> > Thanks! :)
> >
> > Lobster <lobo at lobs.sytes.net> wrote:
> >
> > > On 5/06/2012 11:01 a.m., hans at netupgrades.com wrote:
> > > > Hi -
> > > >
> > > > Videos are being shortened (losing frames?).
> > > >
> > > > My source video is a desktop recording of me scrolling down a
> > > > web page, and I wait for a few seconds each time before I
> > > > scroll down further.
> > > >
> > > > I think mencoder is optimizing these "similar" frames and drops
> > > > them.
> > > >
> > > >
> > > > I have tried many variations to keep my long scroll pauses
> > > > intact:
> > > >
> > > > mencoder out.ogv -audiofile myfile.mp3 -ovc lavc -oac mp3lame
> > > > -fps 5 -o test.avi
> > > >
> > > > mencoder out.ogv -audiofile myfile.mp3 -ovc lavc -oac mp3lame
> > > > -fps 15 -o test.avi
> > > >
> > > > mencoder out.ogv -audiofile myfile.mp3 -ovc lavc -oac mp3lame
> > > > -fps 15 -vf harddup -o test.avi
> > > >
> > > > mencoder out.ogv -audiofile myfile.mp3 -ovc lavc -oac mp3lame
> > > > -vf harddup -o test.avi
> > > >
> > > > These are the type of messages I see:
> > > >
> > > > 1 duplicate frame(s)!
> > > > Pos:  10.9s    151f (93%) 16.10fps Trem:   0min   2mb
> > > > A-V:-0.133 [1406:210]
> > > >
> > > >
> > > > Each time, I see duplicate frames being dropped, and my video
> > > > is a very fast scrolling down the web page.
> > > >
> > > > I thought -vf harddup made it not lose frames?
> > > >
> > > > How do I keep the same video length as my source file?
> > >
> > > use -ofps to force the output frame rate.
> > > I.E `mencoder out.ogv -audiofile myfile.mp3 -ovc lavc -oac mp3lame
> > > -vf harddup -ofps 15 -o test.avi`
> > >
> > >
> > > _______________________________________________
> > > MEncoder-users mailing list
> > > MEncoder-users at mplayerhq.hu
> > > https://lists.mplayerhq.hu/mailman/listinfo/mencoder-users
> >
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> >
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