[FFmpeg-user] Bitrate won't change

[Michael Murphy]

Fairly new user here trying to stream an IP camera from a Rasberry Pi3 (Debian) to Youtube for live view.

This works but crashes as the audio and video bitrate do not change and are too high.

Here's my command line:

ffmpeg -f lavfi -i anullsrc -rtsp_transport tcp -thread_queue_size 512 -i rtsp://admin:***@xx.xx.xx.xxx/544/h264/ch1/main/av_stream -tune zerolatency -vcodec libx264 -preset slower -x264opts bitrate=2500:vbv-maxrate=2500:vbv-bufsize=166 -g 120 -pix_fmt yuv420p+ -c:v copy -c:a aac -strict experimental -b:a 128k -f flv rtmp://a.rtmp.youtube.com/live2/my_youtube_key


Once launched terminal shows stream as
Frame= 69 fps= 68 q=-1.0 size= 1043kb time=00:00:02.09 bitrate=4086.9kbits/


Youtube reports:
The audio stream's current bitrate (2.00 Kbps) is lower than the recommended bitrate. We recommend that you use an audio stream bitrate of 128 Kbps.
The stream's current bitrate (4001.00 Kbps) is higher than the recommended bitrate. We recommend that you use a stream bitrate of 2500 Kbps.

Mike Murphy - Supervisor
uOttawa Science Electronics Shop
009-140 Louis Pasteur Priv
Ottawa, ON K1N 6N5
[phone] ext.6745
***@uottawa.ca<mailto:***@uottawa.ca>
[uOttawa]

[Simon Brown]

Post by Michael Murphy
ffmpeg -f lavfi -i anullsrc -rtsp_transport tcp -thread_queue_size 512 -i
zerolatency -vcodec libx264 -preset slower -x264opts
bitrate=2500:vbv-maxrate=2500:vbv-bufsize=166 -g 120 -pix_fmt yuv420p+
-c:v copy -c:a aac -strict experimental -b:a 128k -f flv rtmp://
a.rtmp.youtube.com/live2/my_youtube_key
Unless I'm much mistaken you have -c:v copy which implies it's not going

to change the video bit rate at all - it's just copying the video stream.
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[Michael Murphy]

Worse!

ffmpeg -f lavfi -i anullsrc -rtsp_transport tcp -thread_queue_size 512 -i rtsp:// admin:***@xx.xx.xx.xxx /544/h264/ch1/main/av_stream -tune zerolatency -vcodec libx264 -preset slower -x264opts bitrate=4000:vbv-maxrate=4000:vbv-bufsize=166 -g 120 -c:a aac -b:a 128k -f flv rtmp://a.rtmp.youtube.com/live2/ my_youtube_key


Mike Murphy - Supervisor
uOttawa Science Electronics Shop
009-140 Louis Pasteur Priv
Ottawa, ON K1N 6N5
[phone] ext.6745
***@uottawa.ca



-----Original Message-----
From: ffmpeg-user [mailto:ffmpeg-user-***@ffmpeg.org] On Behalf Of Simon Brown
Sent: December-18-17 12:10 PM
To: FFmpeg user questions
Subject: Re: [FFmpeg-user] Bitrate won't change

Post by Michael Murphy
ffmpeg -f lavfi -i anullsrc -rtsp_transport tcp -thread_queue_size 512
-tune zerolatency -vcodec libx264 -preset slower -x264opts
bitrate=2500:vbv-maxrate=2500:vbv-bufsize=166 -g 120 -pix_fmt
yuv420p+ -c:v copy -c:a aac -strict experimental -b:a 128k -f flv
rtmp:// a.rtmp.youtube.com/live2/my_youtube_key
Unless I'm much mistaken you have -c:v copy which implies it's not going

to change the video bit rate at all - it's just copying the video stream.
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[Carl Eugen Hoyos]

Complete, uncut console output missing.

Post by Michael Murphy
The audio stream's current bitrate (2.00 Kbps) is lower than the recommended
bitrate. We recommend that you use an audio stream bitrate of 128 Kbps.

FFmpeg aac encoder does not support cbr, silence always uses a low bitrate.

Post by Michael Murphy
The stream's current bitrate (4001.00 Kbps) is higher than the recommended
bitrate. We recommend that you use a stream bitrate of 2500 Kbps.

Isn't this what you requested?

Consider using file input and file output to make
reproducing your use case easier.

Remember not to top-post here, Carl Eugen
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