[FFmpeg-user] Please streaming over nginx

[Phat Nguyentan]

Hi Moritz Barsnick,
I appreciate your help, I tried with h263, it's not support flv, but nerver
mind, I just want to ask you 1 question about hardware.
Can you recommend 1 development board to good use with ffmpeg? Now I use
linkit 7688 dou, It's not good to use ffmpeg (encoding video).
Thanks

On Wed, Aug 7, 2019 at 7:23 PM Moritz Barsnick <barsnick at gmx.net> wrote:

> On Wed, Aug 07, 2019 at 15:50:32 +0700, Phat Nguyentan wrote:
> > Hi Moritz Barsnick,
> > Thank you so much to help me. Please check this link:
> > https://drive.google.com/open?id=1KpIVkt9WA0O2CDU3E9BjuSxPhcik8gto
>
> A friendly hint: Instead of creating 12 MB of videos, you could have
> just copied the text from the console (after the demonstration) and
> pasted it into the email, or into text documents to attach. It makes
> it much easier for everyone to look at it.
>
> > Clip 1> Run ffmpeg on ubuntu and nginx server on ubuntu:
> > - command: ffmpeg -loglevel verbose -re -i /dev/video0 -vcodec libx264
> > -acodec libmp3lame -ar 44100 -ac 1 -f flv rtmp://
> 192.168.1.11:1935/hls/movie
> > - result: move-01.ts (and movie.m3u8 later),
>
> Understood. This is how we expect it to work.
>
> > Clip 2> Run ffmpeg on openwrt:
> > - command: ffmpeg -loglevel verbose -re -i /dev/video0 -vcodec libx264
> > -acodec libmp3lame -ar 44100 -ac 1 -f flv rtmp://
> 192.168.1.11:1935/hls/movie
> > - result: Unknown encoder 'libx264'
>
> Which is pretty obvious.
>
> > - command: ffmpeg -loglevel verbose -re -i /dev/video0  -acodec
> libmp3lame
> > -ar 44100 -ac 1 -f flv rtmp://192.168.1.11:1935/hls/movie
> > - result: working ( but nginx can not create move-01.ts and movie.m3u8
> > later).
>
> Here, ffmpeg uses the "flv1" codec. Apparently, nginx has a problem
> with that. Doesn't nginx have any log messages? /vog/log/httpd/ or
> /var/log/apache/ or /var/log/nginx/? If it can't produce output from an
> input, it should complain somewhere.
>
> This documentation page:
>
> https://github.com/arut/nginx-rtmp-module/wiki/Getting-started-with-nginx-rtmp#publishing-with-ffmpeg
> says:
>
>     RTMP supports only a limited number of codecs. The most popular
>     RTMP video codecs are H264, Sorenson-H263 (aka flv) and audio
>     codecs AAC, MP3, Nellymoser, Speex. If your video is encoded with
>     these codecs (the most common pair is H264/AAC) then you do not
>     need any conversion. Otherwise you need to convert video to one of
>     supported codecs.
>
> According to that, openwrt's ffmpeg encode to "flv1" should be just
> fine! You could try "-vcodec h263" instead, but that's not quite flv,
> IIUC.
>
> Furthermore, you will notice another issue: ffmpeg on openwrt/mylinkit
> encodes your 640x480 video with 30 fps at a rate of ~5 fps (0.158x).
> That is *much* too slow for streaming. I assume the openwrt processor
> (is this a router? a settop box?) is just not capable of encoding any
> reasonable video. Sometimes, encoding can be tweaked to be faster
> (while less efficient), but I don't see where we can gain a factor of
> 6. (I don't know the FLV1 flags - in x264, we can get it relatively
> fast with a profile.)
>
> > Please help me.
>
> Good luck,
> Moritz
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