[FFmpeg-user] Why does this half the filesize

[Reindl Harald]

because the bitrates are different and sameq is useless before input-file

Am 05.05.2011 21:54, schrieb Cecil Westerhof:
> When executing:
>     ffmpeg -y -sameq -i original/resolutie.avi resolutie.avi
> 
> The resulting file is half as big as the original one. Why is this?
> 
> The reason I do this, is that I capture something from XWindows and I
> have to cut the last few seconds.
> 
> If it is useful:
> ffmpeg -i original/resolutie.avi 
> FFmpeg version SVN-r201104161305, Copyright (c) 2000-2011 the FFmpeg developers
>   built on Apr 16 2011 11:36:21 with gcc 4.5.1 20101208 [gcc-4_5-branch revision 167585]
>   configuration: --shlibdir=/usr/lib --prefix=/usr --mandir=/usr/share/man --libdir=/usr/lib --enable-shared --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libxvid --enable-postproc --enable-gpl --enable-x11grab --extra-cflags='-fomit-frame-pointer -fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/gsm' --enable-debug --disable-stripping --enable-libgsm --enable-libschroedinger --enable-libdirac --enable-avfilter --enable-libvpx --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libdc1394 --enable-pthreads --enable-librtmp
>   libavutil    50. 40. 1 / 50. 40. 1
>   libavcodec   52.119. 1 / 52.119. 1
>   libavformat  52.108. 0 / 52.108. 0
>   libavdevice  52.  4. 0 / 52.  4. 0
>   libavfilter   1. 79. 0 /  1. 79. 0
>   libswscale    0. 13. 0 /  0. 13. 0
>   libpostproc  51.  2. 0 / 51.  2. 0
> Input #0, avi, from 'original/resolutie.avi':
>   Metadata:
>     encoder         : Lavf52.108.0
>   Duration: 00:00:53.93, start: 0.000000, bitrate: 2809 kb/s
>     Stream #0.0: Video: mpeg4, yuv420p, 1028x795 [PAR 1:1 DAR 1028:795], 15 tbr, 15 tbn, 15 tbc
>     Stream #0.1: Audio: pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s
> At least one output file must be specified
> 
> 
> 
> ffmpeg -i resolutie.avi 
> FFmpeg version SVN-r201104161305, Copyright (c) 2000-2011 the FFmpeg developers
>   built on Apr 16 2011 11:36:21 with gcc 4.5.1 20101208 [gcc-4_5-branch revision 167585]
>   configuration: --shlibdir=/usr/lib --prefix=/usr --mandir=/usr/share/man --libdir=/usr/lib --enable-shared --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libxvid --enable-postproc --enable-gpl --enable-x11grab --extra-cflags='-fomit-frame-pointer -fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/gsm' --enable-debug --disable-stripping --enable-libgsm --enable-libschroedinger --enable-libdirac --enable-avfilter --enable-libvpx --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libdc1394 --enable-pthreads --enable-librtmp
>   libavutil    50. 40. 1 / 50. 40. 1
>   libavcodec   52.119. 1 / 52.119. 1
>   libavformat  52.108. 0 / 52.108. 0
>   libavdevice  52.  4. 0 / 52.  4. 0
>   libavfilter   1. 79. 0 /  1. 79. 0
>   libswscale    0. 13. 0 /  0. 13. 0
>   libpostproc  51.  2. 0 / 51.  2. 0
> Input #0, avi, from 'resolutie.avi':
>   Metadata:
>     encoder         : Lavf52.108.0
>   Duration: 00:00:53.93, start: 0.000000, bitrate: 1458 kb/s
>     Stream #0.0: Video: mpeg4, yuv420p, 1028x795 [PAR 1:1 DAR 1028:795], 15 tbr, 15 tbn, 15 tbc
>     Stream #0.1: Audio: mp2, 44100 Hz, stereo, s16, 64 kb/s
> At least one output file must be specified
> 

-- 

Mit besten Grüßen, Reindl Harald
the lounge interactive design GmbH
A-1060 Vienna, Hofmühlgasse 17
CTO / software-development / cms-solutions
p: +43 (1) 595 3999 33, m: +43 (676) 40 221 40
icq: 154546673, http://www.thelounge.net/

http://www.thelounge.net/signature.asc.what.htm

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