[FFmpeg-user] To convert or not to convert

[Roger Pack]

On 12/15/12, Cecil Westerhof <Cecil at decebal.nl> wrote:
> I already send this email, but with the wrong title. I was composing
> my email and found out that the problem was that my (old) system could
> not keep up with the high def video. So I went a resolution lower and
> there was no problem with the audio, but saw the warning. I rewrote
> the message, but not the title. :-(
>
> I just bought a Canon SX240 HS. I made a short video for testing
> purposes. When looking at the input file with:
>     ffmpeg -i MVI_0019.MOV
>
> I get:
>     ffmpeg version 0.9.1, Copyright (c) 2000-2012 the FFmpeg developers
>       built on Jan  6 2012 11:01:08 with gcc 4.6.2
>       configuration: --shlibdir=/usr/lib --prefix=/usr
> --mandir=/usr/share/man --libdir=/usr/lib --enable-shared --disable-static
> --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    51. 32. 0 / 51. 32. 0
>       libavcodec   53. 42. 4 / 53. 42. 4
>       libavformat  53. 24. 2 / 53. 24. 2
>       libavdevice  53.  4. 0 / 53.  4. 0
>       libavfilter   2. 53. 0 /  2. 53. 0
>       libswscale    2.  1. 0 /  2.  1. 0
>       libpostproc  51.  2. 0 / 51.  2. 0
>
>     Seems stream 0 codec frame rate differs from container frame rate:
> 60000.00 (60000/1) -> 29.97 (30000/1001)
>     Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MVI_0019.MOV':
>       Metadata:
>         major_brand     : qt
>         minor_version   : 537331968
>         compatible_brands: qt  CAEP
>         creation_time   : 2012-12-15 14:16:51
>       Duration: 00:01:11.80, start: 0.000000, bitrate: 25145 kb/s
>         Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 /
> 0x31637661), yuvj420p, 1280x720, 23599 kb/s, 29.97 fps, 29.97 tbr, 30k tbn,
> 60k tbc
>         Metadata:
>           creation_time   : 2012-12-15 14:16:51
>           handler_name    :
>         Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz,
> stereo, s16, 1536 kb/s
>         Metadata:
>           creation_time   : 2012-12-15 14:16:51
>           handler_name    :
>     At least one output file must be specified
>
> Why do I get the frame rate differs message?
>
> I need to cut the start and the end from the video. That is not a
> problem. I was just wondering: should I do just a copy, or convert it
> to another format? I now have a warning,

Which warning are you referring to?