Changes between Version 5 and Version 6 of EncodingForStreamingSites

Timestamp:

Jan 26, 2017, 6:35:17 PM (9 years ago)

Author:

llogan

Comment:

added tee example. removed useless mp3 info: use aac instead.

EncodingForStreamingSites

@@ -34 +34 @@
 Use a 2 second GOP (Group of Pictures), so simply multiply your output frame rate * 2. For example, if your input is `-framerate 30`, then use `-g 60`.
 
-== MP3 or AAC ==
-
-If you compiled `ffmpeg` with support for `libfdk_aac`, then you can use that for your audio. If not, then use `-acodec libmp3lame -ar 44100` as shown in many of these examples. MP3 in FLV is limited to specific audio rates, but you can omit `-ar` if you are encoding to AAC. See the [[AACEncodingGuide|FFmpeg and AAC Encoding Guide]] for more information.
-
 ----
 
@@ -48 +44 @@
 {{{
 $ ffmpeg -f alsa -ac 2 -i hw:0,0 -f x11grab -framerate 30 -video_size 1280x720 \
--i :0.0+0,0 -vcodec libx264 -preset veryfast -maxrate 1984k -bufsize 3968k \
+-i :0.0+0,0 -c:v libx264 -preset veryfast -maxrate 1984k -bufsize 3968k \
 -vf "format=yuv420p" -g 60 -c:a aac -b:a 128k -ar 44100 \
 -f flv rtmp://live.twitch.tv/app/<stream key>
@@ -59 +55 @@
 {{{
 $ ffmpeg -f alsa -ac 2 -i hw:0,0 -f x11grab -framerate 30 -video_size 1680x1050 \
--i :0.0+0,0 -vcodec libx264 -preset veryfast -maxrate 3000k -bufsize 3000k \
+-i :0.0+0,0 -c:v libx264 -preset veryfast -maxrate 3000k -bufsize 3000k \
 -vf "scale=1280:-1,format=yuv420p" -g 60 -c:a aac -b:a 128k -ar 44100 \
 -f flv rtmp://live.twitch.tv/app/<stream key>
@@ -77 +73 @@
  [1:v]scale=120:-1,setpts=PTS-STARTPTS[fg]; \
  [bg][fg]overlay=W-w-10:10,format=yuv420p[out]"
--map "[out]" -map 2:a -vcodec libx264 -preset veryfast \
+-map "[out]" -map 2:a -c:v libx264 -preset veryfast \
 -maxrate 3000k -bufsize 4000k -c:a aac -b:a 160k -ar 44100 \
 -f flv rtmp://live.twitch.tv/app/<stream key>
@@ -98 +94 @@
  [bg][fg]overlay=W-w-10:10[bg2]; \
  [bg2][3:v]overlay=W-w-10:H-h-10,format=yuv420p[out]"
--map "[out]" -map 2:a -vcodec libx264 -preset veryfast \
+-map "[out]" -map 2:a -c:v libx264 -preset veryfast \
 -maxrate 3000k -bufsize 4000k -c:a aac -b:a 160k -ar 44100 -b:a 128k \
 -f flv rtmp://live.twitch.tv/app/<stream key>
@@ -108 +104 @@
 
 {{{
-$ ffmpeg -re -i input.mkv -vcodec libx264 -preset veryfast -maxrate 3000k \
+$ ffmpeg -re -i input.mkv -c:v libx264 -preset veryfast -maxrate 3000k \
 -bufsize 6000k -pix_fmt yuv420p -g 50 -c:a aac -b:a 160k -ac 2 \
 -ar 44100 -f flv rtmp://live.twitch.tv/app/<stream key>
@@ -118 +114 @@
 
 {{{
-$ ffmpeg -i input.mkv -vcodec libx264 -preset medium -maxrate 3000k -bufsize 6000k \
--vf "scale=1280:-1,format=yuv420p" -g 50 -acodec libmp3lame -b:a 128k -ac 2 -ar 44100 file.flv
+$ ffmpeg -i input.mkv -c:v libx264 -preset medium -maxrate 3000k -bufsize 6000k \
+-vf "scale=1280:-1,format=yuv420p" -g 50 -c:a aac -b:a 128k -ac 2 -ar 44100 file.flv
 }}}
 
 Then [http://ffmpeg.org/ffmpeg.html#Stream-copy stream copy] it to the streaming service:
 {{{
-$ ffmpeg -re -i file.flv -codec copy -f flv rtmp://live.twitch.tv/app/<stream key>
+$ ffmpeg -re -i file.flv -c copy -f flv rtmp://live.twitch.tv/app/<stream key>
+}}}
+
+=== Outputting to multiple streaming services & local file ===
+
+You can use the [https://ffmpeg.org/ffmpeg-formats.html#tee-1 tee muxer] to efficiently stream to multiple sites and save a local copy if desired. Using tee will allow you to encode only once and send the same data to multiple outputs. Using the `onfail` option will allow the other streams to continue if one fails.
+
+{{{
+$ ffmpeg -i input -map 0 -c:v libx264 -c:a aac -muxrate 1000k -bufsize 2000k -g 50 -f tee \
+"[f=flv:onfail=ignore]rtmp://facebook|[f=flv:onfail=ignore]rtmp://youtube|local_file.mkv"
 }}}
 
@@ -131 +136 @@
 == Notes ==
 
-* You can use `xwininfo | grep geometry` to select the target window and get placement coordinates. For example, an output of  `-geometry 800x600+284+175` would result in using `-video_size 800x600 -i :0.0+284,175`. You can also use it to automatically enter the input screen size: `-video_size $(xwininfo -root | awk '/-geo/{print $2}')`.
+* Linux users can use `xwininfo | grep geometry` to select the target window and get placement coordinates. For example, an output of  `-geometry 800x600+284+175` would result in using `-video_size 800x600 -i :0.0+284,175`. You can also use it to automatically enter the input screen size: `-video_size $(xwininfo -root | awk '/-geo/{print $2}')`.
 
 * The [http://ffmpeg.org/ffmpeg-devices.html#pulse-1 pulse input device] (requires `--enable-libpulse`) can be an alternative to the [http://ffmpeg.org/ffmpeg-devices.html#alsa-1 ALSA input device], as in: `-f pulse -i default`.