[FFmpeg-user] ffmpeg extremely high consumption

[En Figureo Canal]

On Sat, Jun 13, 2015 at 10:28 PM, Pavel Koshevoy <pkoshevoy at gmail.com>
wrote:

> On 6/13/15 17:49, En Figureo Canal wrote:
>
>> On Sat, Jun 13, 2015 at 8:24 PM, Moritz Barsnick <barsnick at gmx.net>
>> wrote:
>>
>>  On Sat, Jun 13, 2015 at 19:17:51 -0400, En Figureo Canal wrote:
>>>
>>>> Noticed that, after Henk's reply, if I use -vcodec copy then the output
>>>> will "copy" the source video's attribute (-vb, size, etc...), but, if I
>>>> really need to set the video rate (-vb) then I need to specify the codec
>>>> needed to encode the new video.
>>>>
>>> No, it does not copy the attributes (those are very had to duplicate),
>>> it copies the stream without reencoding. You wouldn't even need libx264
>>> for that.
>>>
>>>   <http://ffmpeg.org/mailman/listinfo/ffmpeg-user>
>>>
>>>  I understand I don't need libx264 but, when I tried it like this:
>>
>> ffmpeg -i video.mp4 -vcodec copy -vb 1024k -f flv rtmp://ip/live/test
>>
>> the output rate was the original video rate at 4M
>>
>> But, if I do this:
>>
>> ffmpeg -i video.mp4 -vcodec libx264 -vb 1024k  -f flv rtmp://ip/live/test
>>
>> the output rate is at 1M but video freezes.
>>
>
> You either need a faster computer, or a hardware accelerated encoder
> (nvenc if you have compatible NVIDIA card), or you can use a less demanding
> libx264 preset -- "veryfast" might work, "ultrafast" is most likely to
> work.  I believe the default is "medium".  The cheapest and quickest thing
> you can try is adding -preset ultrafast after libx264.  If you don't like
> the quality try -preset veryfast. If that fails consider using nvenc.
>
> Also, see here -- https://trac.ffmpeg.org/wiki/EncodingForStreamingSites
> -- it appears to be relevant to what you are trying to do.
>
>     Pavel.
>
>
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Pavel thanks for replying.

I'm using ultrafast preset.