[FFmpeg-user] How to drop every Nth frame?

[Andrey Aleksandrovich]

On 9/29/13, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
> Andrey Aleksandrovich writes:
>
>> After all experiments I've got synced a-v at the start
>> and at the end, but not at the middle.
>
> Please provide your command line together with the
> complete, uncut console output.
>
> Carl Eugen
>
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E:\Media\test>ffmpeg -i Original.avi -c:v copy -b:a 128K -filter:a
atempo=0.99741 -ar 48000 sync4.avi
ffmpeg version N-56704-g3e0c78b Copyright (c) 2000-2013 the FFmpeg developers
  built on Sep 27 2013 18:01:57 with gcc 4.8.1 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads
--enable-avisynth --enable-bzlib --enable-fontconfig --enable
-frei0r --enable-gnutls --enable-iconv --enable-libass
--enable-libbluray --enable-libcaca --enable-libfreetype
--enable-libgsm --
enable-libilbc --enable-libmodplug --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libopenjpeg
--enable-libopus --enable-librtmp --enable-libschroedinger
--enable-libsoxr --enable-libspeex --enable-libtheora
--enable-libtwola
me --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
--enable-libvorbis --enable-libvpx --enable-libwavpack --enab
le-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      52. 46.100 / 52. 46.100
  libavcodec     55. 33.101 / 55. 33.101
  libavformat    55. 18.104 / 55. 18.104
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 87.100 /  3. 87.100
  libswscale      2.  5.100 /  2.  5.100
  libswresample   0. 17.103 /  0. 17.103
  libpostproc    52.  3.100 / 52.  3.100
Guessed Channel Layout for  Input Stream #0.1 : stereo
Input #0, avi, from 'Original.avi':
  Duration: 01:33:34.40, start: 0.000000, bitrate: 287 kb/s
    Stream #0:0: Video: msmpeg4v3 (DIV3 / 0x33564944), yuv420p,
320x240, 20 tbr, 20 tbn, 20 tbc
    Stream #0:1: Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, stereo,
fltp, 160 kb/s
Output #0, avi, to 'sync4.avi':
  Metadata:
    ISFT            : Lavf55.18.104
    Stream #0:0: Video: msmpeg4v3 (DIV3 / 0x33564944), yuv420p,
320x240, q=2-31, 20 tbn, 20 tbc
    Stream #0:1: Audio: mp3 (libmp3lame) (U[0][0][0] / 0x0055), 48000
Hz, stereo, s16p, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (wmav2 -> libmp3lame)
Press [q] to stop, [?] for help
[wmav2 @ 024428a0] nb_frames is 0    630kB time=00:00:13.63 bitrate=
378.8kbits/s
Error while decoding stream #0:1: Invalid data found when processing input
[wmav2 @ 024428a0] overflow in spectral RLE, ignoring
[wmav2 @ 024428a0] nb_frames is 0   1595kB time=00:00:40.12 bitrate=
325.7kbits/s
Error while decoding stream #0:1: Invalid data found when processing input
[wmav2 @ 024428a0] overflow in spectral RLE, ignoring

*  *  * [very long list of warnings] *  *  *