[FFmpeg-user] Sound or Video - but I can't get both to work...

[Bradley D. Thornton]

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On 06/12/2011 06:58 PM, Reindl Harald wrote:
> 
> 
> Am 13.06.2011 03:54, schrieb Bradley D. Thornton:
> 
>> I get video but no sound when I do this:
>>
>> ffmpeg -f alsa -i plughw:0,0 -f x11grab -r 25 -s 1440x900 -i :0.0
>> -acodec pcm_s16le -vcodec huffyuv -sameq screencast.avi
>>
>> or this:
>>
>> ffmpeg -f alsa -ac 2 -i plughw:0,0 -f x11grab -r 25 -s 1440x900 -i :0.0
>> -acodec pcm_s16le -vcodec libx264 -vpre lossless_ultrafast -threads 0
>> output.mkv
>>
>> -f oss (gives an error - no device) and I do not have pulse.
> 
> why do you specifiy params before "-i"?
> these are normally for the input-file and i guess
> ffmpeg will in most cases know better what the input is


That's what the tutorial here:
http://verb3k.wordpress.com/2010/01/26/how-to-do-proper-screencasts-on-linux/
gave as examples, and also what other people were offering up.

I get the following errors when I try your suggestion with the
corresponding command:

<snip>

ffmpeg -i plughw:0 -f x11grab -r 25 -s 1440x900 -i :0.0 -acodec
pcm_s16le -vcodec huffyuv -sameq screencast.avi

FFmpeg version 0.6.1, Copyright (c) 2000-2010 the FFmpeg developers
  built on Feb  3 2011 00:17:04 with gcc 4.4.4
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64
- --mandir=/usr/man --enable-libmp3lame --enable-libfaac --enable-nonfree
- --enable-gpl --enable-version3 --enable-postproc --enable-avfilter
- --enable-libdc1394 --enable-libfaad --enable-libgsm
- --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp
- --enable-libschroedinger --enable-libspeex --enable-libtheora
- --enable-libvpx --enable-libx264 --enable-runtime-cpudetect
- --enable-vaapi --disable-vdpau --enable-memalign-hack --enable-pthreads
- --enable-x11grab --enable-bzlib --enable-zlib --enable-shared
- --enable-static --disable-debug --arch=x86_64 --enable-pic
- --extra-cflags='-I/tmp/build/tmp-ffmpeg/ffmpegdeps/usr/include
- -DRUNTIME_CPUDETECT'
- --extra-ldflags='-L/tmp/build/tmp-ffmpeg/ffmpegdeps/usr/lib64 -lssl
- -lcrypto -lz -lusb'
  libavutil     50.15. 1 / 50.15. 1
  libavcodec    52.73. 2 / 52.73. 2
  libavformat   52.64. 2 / 52.64. 2
  libavdevice   52. 2. 0 / 52. 2. 0
  libavfilter    1.19. 0 /  1.19. 0
  libswscale     0.11. 0 /  0.11. 0
  libpostproc   51. 2. 0 / 51. 2. 0
plughw:0,0: No such file or directory


</snip>

And I only removed the first -f for the audio device. I get the same
error when I remove both -f parameters, although it doesn't make sense
to me why I would not have them there anyway, and even if they were
optional to specify, why it would be better not to?

> 
> 
> 
> 
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- -- 
Bradley D. Thornton
Manager Network Services
NorthTech Computer
TEL: +1.760.666.2703  (US)
TEL: +44.203.318.2755 (UK)
http://NorthTech.US

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