> On Jul 26, 2015, at 3:28 AM, Carl Eugen Hoyos <ceho...@ag.or.at> wrote:
>
> Ricardo Kleemann <ricardo <at> americasnet.com> writes:
>
>> Input #0, avfoundation, from 'none:1':
>> Duration: N/A, start: 28853.224036
>
>> Input #1, decklink, from 'UltraStudio Mini Recorder <at> 9':
>> Duration: N/A, start: 0.000000
>
> The different start times are an issue.
>
> Does it work if you only record audio?
>
I’m not sure where the crazy start time comes from, but yes, the audio works
fine if done separately.
Maybe I need to do something differently to mix the audio and video?
$ ffmpeg -f avfoundation -i "none:1" -ac 2 -vn audio.mp4
ffmpeg version N-73104-g7604358 Copyright (c) 2000-2015 the FFmpeg developers
built with Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
configuration: --prefix=/usr/local --enable-gpl --enable-nonfree
--enable-ffplay --enable-libass --enable-libfdk-aac --enable-libfreetype
--enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis
--enable-libvpx --enable-libx264 --enable-libxvid --enable-decklink
--extra-cflags=-I/Users/ptl/blackmagicsdk/Mac/include
--extra-ldflags=-L/Users/ptl/blackmagicsdk/Mac/include
libavutil 54. 27.100 / 54. 27.100
libavcodec 56. 44.100 / 56. 44.100
libavformat 56. 38.100 / 56. 38.100
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 17.100 / 5. 17.100
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.100 / 1. 2.100
libpostproc 53. 3.100 / 53. 3.100
Input #0, avfoundation, from 'none:1':
Duration: N/A, start: 66610.243492, bitrate: 2822 kb/s
Stream #0:0: Audio: pcm_f32le, 44100 Hz, stereo, flt, 2822 kb/s
Output #0, mp4, to 'audio.mp4':
Metadata:
encoder : Lavf56.38.100
Stream #0:0: Audio: aac (libfdk_aac) ([64][0][0][0] / 0x0040), 44100 Hz,
stereo, s16, 128 kb/s
Metadata:
encoder : Lavc56.44.100 libfdk_aac
Stream mapping:
Stream #0:0 -> #0:0 (pcm_f32le (native) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
size= 330kB time=00:00:20.81 bitrate= 129.9kbits/s
video:0kB audio:326kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: 1.301418%
> Carl Eugen
>
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