Dropping audio in ffmpeg conversion

Sun Dec 7 00:02:48 UTC 2014

William A. Mahaffey III wrote:
> On 12/06/14 17:17, Waitman Gobble wrote:
>> On Sat, Dec 6, 2014 at 2:43 PM, Polytropon <freebsd at edvax.de> wrote:
>>
>>> I'm searching for a convenient way to drop audio from
>>> an AVI file (video and audio) upon conversion to MP4.
>>> My tool of choice is ffmpeg, which works perfectly fine
>>> with the default options:
>>>
>>>          % ffmpeg -i in.avi out.mp4
>>>
>>> The quality loss, the "pixelated" and "blocky" output
>>> is what I expect, and the result file is small. I just
>>> can't find a way to get rid of audio (which I don't
>>> need). Reading "man ffmeg" told me about "sinks" which
>>> "do nothing", but I'm too stupid to conclude how to use
>>> them properly. What I want to have is a converted video
>>> with no audio track at all (also smaller file size).
>>>
>>> Can ffmpeg do this, or do I have to "preprocess" the
>>> input file with mencoder somehow?
>>>
>>> Does anybody know how to proceed?
>>>
>>>
>>>
>>> -- 
>>> Polytropon
>>> Magdeburg, Germany
>>> Happy FreeBSD user since 4.0
>>> Andra moi ennepe, Mousa, ...
>>> _______________________________________________
>>> freebsd-questions at freebsd.org mailing list
>>> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
>>> To unsubscribe, send any mail to "
>>> freebsd-questions-unsubscribe at freebsd.org"
>>>
>>
>> I think it's -an switch.
>>
>
> Out of curiosity from this thread, I decided to install ffmpeg & 
> possibly play around w/ it. Here's the transcript:
>
> [root at kabini1, /etc, 12:20:50pm] 332 % pkg install -y ffmpeg
> Updating FreeBSD repository catalogue...
> Fetching meta.txz: 100%   968 B   1.0k/s    00:01
> Fetching digests.txz: 100%    2 MB 341.9k/s    00:06
> Fetching packagesite.txz: 100%    5 MB 354.7k/s    00:15
> Removing expired repository entries: 100%
> Processing new repository entries: 100%
> FreeBSD repository update completed. 23602 packages processed:
>   17694 updated, 147 removed and 41 added.
> Updating FreeBSD_new_xorg repository catalogue...
> FreeBSD_new_xorg repository is up-to-date.
>
> nspluginwrapper-1.4.4_4 is locked and may not be modified
> The following 15 packages will be affected (of 0 checked):
>
> New packages to be INSTALLED:
>         ffmpeg: 2.3.5_3,1 [FreeBSD]
>         linux_base-f10: 10_9 [FreeBSD]
>         linux-f10-xorg-libs: 7.4_1 [FreeBSD]
>         linux-f10-fontconfig: 2.6.0_1 [FreeBSD]
>         linux-f10-expat: 2.0.1_1 [FreeBSD]
>         linux-f10-pango: 1.28.3_1 [FreeBSD]
>         linux-f10-png: 1.2.37_2 [FreeBSD]
>         linux-f10-cairo: 1.8.0_3 [FreeBSD]
>         linux-f10-gtk2: 2.14.7_5 [FreeBSD]
>         linux-f10-tiff: 3.8.2 [FreeBSD]
>         linux-f10-jpeg: 6b [FreeBSD]
>         linux-f10-atk: 1.24.0_1 [FreeBSD]
>         schroedinger: 1.0.11_3 [FreeBSD]
>         libx264: 0.142.2455 [FreeBSD]
>         opencv-core: 2.4.9_1 [FreeBSD]
>
> The process will require 209 MB more space.
> 33 MB to be downloaded.
> Fetching ffmpeg-2.3.5_3,1.txz: 100%    8 MB 380.5k/s    00:24
> Fetching linux_base-f10-10_9.txz: 100%   16 MB 366.0k/s    00:48
> Fetching linux-f10-xorg-libs-7.4_1.txz: 100%    1 MB 316.6k/s 00:05
> Fetching linux-f10-fontconfig-2.6.0_1.txz: 100%  118 kB 121.1k/s 00:01
> Fetching linux-f10-expat-2.0.1_1.txz: 100%   65 kB  67.2k/s 00:01
> Fetching linux-f10-pango-1.28.3_1.txz: 100%  274 kB 281.3k/s 00:01
> Fetching linux-f10-png-1.2.37_2.txz: 100%  150 kB 154.2k/s 00:01
> Fetching linux-f10-cairo-1.8.0_3.txz: 100%  353 kB 361.8k/s 00:01
> Fetching linux-f10-gtk2-2.14.7_5.txz: 100%    3 MB 351.0k/s 00:09
> Fetching linux-f10-tiff-3.8.2.txz: 100%  241 kB 247.5k/s    00:01
> Fetching linux-f10-jpeg-6b.txz: 100%  115 kB 118.1k/s    00:01
> Fetching linux-f10-atk-1.24.0_1.txz: 100%  144 kB 148.0k/s 00:01
> Fetching schroedinger-1.0.11_3.txz: 100%  396 kB 405.9k/s 00:01
> Fetching libx264-0.142.2455.txz: 100%  407 kB 208.4k/s    00:02
> Fetching opencv-core-2.4.9_1.txz: 100%    1 MB 401.3k/s    00:04
> Checking integrity... done (11 conflicting)
> Checking integrity... done (0 conflicting)
> Conflicts with the existing packages have been found.
> One more solver iteration is needed to resolve them.
> The following 5 packages will be affected (of 0 checked):
>
> Installed packages to be REMOVED:
>         nspluginwrapper-1.4.4_4
>
> New packages to be INSTALLED:
>         schroedinger: 1.0.11_3 [FreeBSD]
>         libx264: 0.142.2455 [FreeBSD]
>         opencv-core: 2.4.9_1 [FreeBSD]
>         ffmpeg: 2.3.5_3,1 [FreeBSD]
>
> The process will require 49 MB more space.
>
> nspluginwrapper-1.4.4_4 is locked and may not be modified
>  whew !!!! that took (43.233 cpu + 5.569 sys) sec., 2:50.10 elapsed 
> time tot, 28.6% CPU efficiency
>         (207 text, 2549 data, 46500 max) KB, (0+1411) io, 7318 pfs + 0 
> swaps
> [root at kabini1, /etc, 6:03:18pm] 333 %
>
> in short, it tried to install linux-f10, rather than relying on 
> linux-c6 .... pkg bug ? ffmpeg package bug ? pilot error ? TIA for any 
> clarifications ....
>
I also have this problem.