[FFmpeg-user] down sampling

[Michael Koch]

Am 29.12.2018 um 20:19 schrieb Michael Koch:
>
>> I would use the practical nut container, and do:
>>
>> $ ffmpeg -i input -f nut - | ffplay -
>
> F:\Sound\Ultraschall_Konvertierung>c://ffmpeg/ffmpeg -i 699.mp4 -f nut 
> - | c://f
> fmpeg/ffplay -
> ffmpeg version N-91960-g63c69d51c7 Copyright (c) 2000-2018 the FFmpeg 
> developers
>
>   built with gcc 8.2.1 (GCC) 20180813
>   configuration: --enable-gpl --enable-version3 --enable-sdl2 
> --enable-fontconfi
> g --enable-gnutls --enable-iconv --enable-libass --enable-libbluray 
> --enable-lib
> freetype --enable-libmp3lame --enable-libopencore-amrnb 
> --enable-libopencore-amr
> wb --enable-libopenjpeg --enable-libopus --enable-libshine 
> --enable-libsnappy --
> enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx 
> --enable-l
> ibwavpack --enable-libwebp --enable-libx264 --enable-libx265 
> --enable-libxml2 --
> enable-libzimg --enable-lzma --enable-zlib --enable-gmp 
> --enable-libvidstab --en
> able-libvorbis --enable-libvo-amrwbenc --enable-libmysofa 
> --enable-libspeex --en
> able-libxvid --enable-libaom --enable-libmfx --enable-amf 
> --enable-ffnvcodec --e
> nable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec 
> --enable-dxva2 --enab
> le-avisynth
>   libavutil      56. 19.101 / 56. 19.101
>   libavcodec     58. 30.100 / 58. 30.100
>   libavformat    58. 18.101 / 58. 18.101
>   libavdevice    58.  4.103 / 58.  4.103
>   libavfilter     7. 31.100 /  7. 31.100
>   libswscale      5.  2.100 /  5.  2.100
>   libswresample   3.  2.100 /  3.  2.100
>   libpostproc    55.  2.100 / 55.  2.100
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '699.mp4':
>   Metadata:
>     major_brand     : isom
>     minor_version   : 512
>     compatible_brands: isomiso2avc1mp41
>     encoder         : Lavf58.18.101
>   Duration: 00:00:53.02, start: 0.000000, bitrate: 7558 kb/s
>     Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 
> stereo, flt
> p, 128 kb/s (default)
>     Metadata:
>       handler_name    : SoundHandler
>     Stream #0:1(eng): Video: h264 (High) (avc1 / 0x31637661), 
> yuvj420p(pc), 1920
> x1080, 7426 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
>     Metadata:
>       handler_name    : VideoHandler
>       timecode        : 00:00:46:17
>     Stream #0:2(eng): Data: none (tmcd / 0x64636D74)
>     Metadata:
>       handler_name    : TimeCodeHandler
>       timecode        : 00:00:46:17
> [NULL @ 0000000000544dc0] Unable to find a suitable output format for '|'
> |: Invalid argument

Might it be part of the problem that I'm starting ffmpeg from a batch file?
This is the content of the batch file:

c://ffmpeg/ffmpeg -i 699.mp4 -f nut - ^| c://ffmpeg/ffplay -
pause

Michael