[FFmpeg-user] From mpeg2 to mpeg4

[Jonathan Isom]

On Sun, Oct 23, 2011 at 9:47 AM, Lorenzo Travaglio
<lorenzo.travaglio at fastwebnet.it> wrote:
> Hi all.
>
> I'm a newbie of ffmpeg
>
> My DTv receiver can record on USB key in mpeg2video format. Since the size
> of the record is about 1Gb/hour I want to reduce it to the size used by avi
> movies but I don't be able to perform this transformation.

Hi
  The first thing just about anybody on this list will tell you is
that you are using  a
very old(2009) version. You should try to install a recent version.
FFmpeg is under
constant development so many options have changed and codecs improved.
 It would
also be beneficial to know the command line you tried. Also are you
wanting just
mpeg4 or mpeg4 AVC(aka h.264)?

Later

Jonathan

> Here is the output of ffmpeg -i for the file obtained by the recorder:
> FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1.2, Copyright (c) 2000-2009
> Fabrice Bellard, et al.
>  configuration: --extra-version=4:0.5.1-1ubuntu1.2 --prefix=/usr
> --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib
> --enable-libgsm --enable-libschroedinger --enable-libspeex
> --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib
> --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl
> --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394
> --enable-shared --disable-static
>  libavutil     49.15. 0 / 49.15. 0
>  libavcodec    52.20. 1 / 52.20. 1
>  libavformat   52.31. 0 / 52.31. 0
>  libavdevice   52. 1. 0 / 52. 1. 0
>  libavfilter    0. 4. 0 /  0. 4. 0
>  libswscale     0. 7. 1 /  0. 7. 1
>  libpostproc   51. 2. 0 / 51. 2. 0
>  built on Sep 16 2011 17:04:18, gcc: 4.4.3
>
> Seems stream 0 codec frame rate differs from container frame rate: 50.00
> (50/1) -> 25.00 (25/1)
> Input #0, mpeg, from 'prova.mpg':
>  Duration: 00:09:03.69, start: 0.180600, bitrate: 5183 kb/s
>    Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720x576 [PAR 64:45 DAR
> 16:9], 4624 kb/s, 25 tbr, 90k tbn, 50 tbc
>    Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16, 192 kb/s
>
> while this is an output from an avi file:
> FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1.2, Copyright (c) 2000-2009
> Fabrice Bellard, et al.
>  configuration: --extra-version=4:0.5.1-1ubuntu1.2 --prefix=/usr
> --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib
> --enable-libgsm --enable-libschroedinger --enable-libspeex
> --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib
> --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl
> --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394
> --enable-shared --disable-static
>  libavutil     49.15. 0 / 49.15. 0
>  libavcodec    52.20. 1 / 52.20. 1
>  libavformat   52.31. 0 / 52.31. 0
>  libavdevice   52. 1. 0 / 52. 1. 0
>  libavfilter    0. 4. 0 /  0. 4. 0
>  libswscale     0. 7. 1 /  0. 7. 1
>  libpostproc   51. 2. 0 / 51. 2. 0
>  built on Sep 16 2011 17:04:18, gcc: 4.4.3
> Input #0, avi, from '.aMuleAdunanzA/Incoming/Cars - Motori ruggenti.avi':
>  Duration: 01:55:19.00, start: 0.000000, bitrate: 845 kb/s
>    Stream #0.0: Video: mpeg4, yuv420p, 576x238 [PAR 1:1 DAR 288:119], 23.98
> tbr, 23.98 tbn, 23.98 tbc
>    Stream #0.1: Audio: mp3, 44100 Hz, stereo, s16, 112 kb/s
>
> May someone help me?
> Many thanks in advance
> Lorenzo
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