[FFmpeg-user] down sampling

[Carl Eugen Hoyos]

> Am 29.12.2018 um 20:41 schrieb Michael Koch <astroelectronic at t-online.de>:
> 
>> 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 -

Why did you add the caret?
And even more important, why did you not post your actual command line when we asked?

Works fine here (unless I add funny characters) here with Windows cmd, both with and without using a batch file.

Carl Eugen