[Libav-user] Convert MP4 1280x720 to MPG 1280x720

[Thomas H]

Hello Carl.

Not sure.
Tried everything in the Docs and FAQ.
I searched everywhere and found it on a forum.
When I run:
ffmpeg -i MyKitty.mp4 -vf scale=1280:720 -idct h264 -sameq -target
ntsc-dvd MyKitty.mpg
The ouput file reports 1280x720 however compared to the original
viewed with VLC, the mpg file looks pixilated.

Regards
Thomas
*********************************************************************************************************************************************************
C:\Users\Thomas\Documents\Blender\cgboorman>ffmpeg -i MyKitty.mp4 -vf
scale=1280:720 -idct h264 -sameq -target ntsc-dvd
MyKitty.mpg
ffmpeg version N-40824-g31dfe20 Copyright (c) 2000-2012 the FFmpeg developers
  built on May 19 2012 00:45:59 with gcc 4.6.3
  configuration: --enable-gpl --enable-version3 --disable-w32threads
--enable-runtime-cpudetect --enable-avisynth --enab
le-bzlib --enable-frei0r --enable-libass --enable-libcelt
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable
-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut
--enable-libopenjpeg --enable-librtmp --enable-libschro
edinger --enable-libspeex --enable-libtheora --enable-libutvideo
--enable-libvo-aacenc --enable-libvo-amrwbenc --enable-
libvorbis --enable-libvpx --enable-libx264 --enable-libxavs
--enable-libxvid --enable-zlib
  libavutil      51. 53.100 / 51. 53.100
  libavcodec     54. 21.101 / 54. 21.101
  libavformat    54.  5.100 / 54.  5.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 74.101 /  2. 74.101
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 12.100 /  0. 12.100
  libpostproc    52.  0.100 / 52.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MyKitty.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2011-11-05 01:52:31
  Duration: 00:07:17.10, start: 0.000000, bitrate: 1086 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
1280x720, 944 kb/s, 30 fps, 30 tbr, 60 tbn, 60 tb
c
    Metadata:
      creation_time   : 1970-01-01 00:00:00
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz,
stereo, s16, 139 kb/s
    Metadata:
      creation_time   : 2011-11-05 01:52:32
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
[buffer @ 0036d020] w:1280 h:720 pixfmt:yuv420p tb:1/1000000 sar:0/1
sws_param:flags=2
[buffersink @ 0036d060] No opaque field provided
[scale @ 0036d0c0] w:1280 h:720 fmt:yuv420p sar:0/1 -> w:720 h:480
fmt:yuv420p sar:0/1 flags:0x4
[scale @ 0036d180] w:720 h:480 fmt:yuv420p sar:0/1 -> w:1280 h:720
fmt:yuv420p sar:0/1 flags:0x4
[abuffer @ 0036d3e0] format:s16 layout:stereo rate:44100
[aformat @ 0036d480] auto-inserting filter 'auto-inserted resampler 0'
between the filter 'src' and the filter 'aformat'

[aresample @ 0036d4e0] r:44100Hz -> r:48000Hz
Output #0, dvd, to 'MyKitty.mpg':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2011-11-05 01:52:31
    encoder         : Lavf54.5.100
    Stream #0:0(und): Video: mpeg2video, yuv420p, 1280x720, q=2-31,
6000 kb/s, 90k tbn, 29.97 tbc
    Metadata:
      creation_time   : 1970-01-01 00:00:00
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: ac3, 48000 Hz, stereo, flt, 448 kb/s
    Metadata:
      creation_time   : 2011-11-05 01:52:32
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> mpeg2video)
  Stream #0:1 -> #0:1 (aac -> ac3)
Press [q] to stop, [?] for help
*********************************************************************************************************************************************************
On Tue, May 29, 2012 at 3:48 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
> Thomas H <thom1948 at ...> writes:
>
>> ffmpeg -i MyKitty.mp4 -vf scale=1280:720 -idct h264 -sameq -target
>> ntsc-dvd MyKitty.mpg
>
> (Complete, uncut console output missing.)
>
> Are you sure you want to produce a "HD" "DVD"?
> Please explain what "-idct h264" does, I am curious.
>
> And please note that -sameq does not mean "same quality".
> (Especially not for h264 -> mpeg1 conversion.)
>
> Carl Eugen
>
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