[FFmpeg-user] To convert or not to convert

[Cecil Westerhof]

Op zaterdag 15 dec 2012 20:41 CET schreef 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?

The first line after showing all the used libraries:
    Seems stream 0 codec frame rate differs from container frame rate: 60000.00 (60000/1) -> 29.97 (30000/1001)

-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof