[vlc] [VLC 2.0.3]

[Petar Koretić]

Yes, VLC uses libraries but no the ffmpeg itself.
It's not about faster, it's about memory and cpu usage which was properly
tested.
I'm  now just curious what is the right way to set this in vlc.

On Wed, Dec 5, 2012 at 3:37 PM, dE . <de.techno at gmail.com> wrote:

>  On 12/03/12 03:06, Petar Koretić wrote:
>
> I wrote that on the line above. In this case, with mpeg2 codec ffmpeg uses
> more resources per one stream, and since we have 50-100 live channels
> transcoding this ends up being pretty big difference.
> On the other hand, If there is an obvious option, why is not working?
> Maybe I should file a  bug report?
>
> On Sun, Dec 2, 2012 at 1:45 PM, dE . <de.techno at gmail.com> wrote:
>
>> I'm not a webserver expert and I think I don't understand your
>> requirements, but you can use ffmpeg for this.
>>
>> ---------------------------------
>> Support software for non profit, buy Android phones.
>>  On Dec 2, 2012 12:13 AM, "Petar Koretić" <petar.koretic at gmail.com>
>> wrote:
>>
>>> I'm doing real time transcoding on our servers. Gui is not an option.
>>> There is already web gui fronted for transcoding.
>>>
>>> On Sat, Dec 1, 2012 at 7:01 PM, dE . <de.techno at gmail.com> wrote:
>>>
>>>> Why dont you use the force aspect ratio line in vlc GUI settings?
>>>> ---------------------------------
>>>> Support software for non profit, buy Android phones.
>>>>  On Nov 30, 2012 3:23 AM, "Petar Koretić" <petar.koretic at gmail.com>
>>>> wrote:
>>>>
>>>>>  This is ffmpeg line ( I have removed other parameters as it would be
>>>>> too long) which works, it sets aspect ratio to what I want (checked with
>>>>> mediainfo, and seen on the system)
>>>>>
>>>>> ffmpeg -i $1 -vcodec mpeg2video -aspect "16:9" -vf
>>>>> scale=$width:$height -an -f mpegts udp://@$2
>>>>>
>>>>> for vlc I use this
>>>>>
>>>>> vlc -I dummy -vvv $1 --sout
>>>>> "#transcode{vcodec=mpeg2v,width=$width,height=$height,acodec=none}
>>>>>
>>>>> Here I tried putting aspect ratio settings on four different places
>>>>> with different names as found over the internet and vlc wiki (aspect,
>>>>> canvas-aspect, canvas-ratio,aspect-ratio) but I just cannot get it to work.
>>>>>
>>>>> In vlc help I can see
>>>>> --aspect-ratio <string> Source aspect ratio
>>>>>
>>>>> but setting that (--aspect-ratio="16:9") haven't changed output aspect
>>>>> ratio.
>>>>>
>>>>> I wan't to have it over vlc since cpu usage with 20 channels
>>>>> transcoded and streamed over the network in realtime is 20% difference on
>>>>> the server.
>>>>>
>>>>>  Thanks in advance.
>>>>>
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>
>
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>
> But VLC uses ffmpeg libraries itself, so the inefficiency of the codec
> will persist. Also it may 'appear' to be faster cause the aspect ratio is
> not enforced.
>
> I'd suggest you compile ffmpeg from GIT and use custom CFLAGS optimised
> for your server.
>
> Constant bitrate also helps, and maybe you can you filters instead of
> -aspect to improve performance.
>
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