On 6/13/15 17:49, En Figureo Canal wrote:
On Sat, Jun 13, 2015 at 8:24 PM, Moritz Barsnick <[email protected]> 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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