the goal:

use ffmpeg to stream audio from shoutcast and a video loop to ustream.tv, justin.tv, twitch.tv, youtube, wowza, flash media server, etc

because ffmpeg -loop 1 seems to only support images, export your loop video file as an image sequence (jpeg,png,etc)

so lets get started. in this example lets output to wowza (mpegts)

ffmpeg -i http://shoutcast.domain.com:port -re -loop 1 -pattern_type glob -i 'live/*.jpg' -c:v libx264 -b:v 3000k -pix_fmt yuvj420p -bsf h264_mp4toannexb -profile:v main -level 41 -g 20 -c:a libfdk_aac -b:a 192k -f mpegts udp://IP:10000?pkt_size=1316


-r 30 will read the image sequence at 30 fps
-loop 1 loops a single image or image sequence
-pattern_type glob allows usage of *
-i '/path/to/loop00*.jpg' path to your image(s) sequence
-i http://shoutcast.domain.com:port host and port of shoutcast server
-f flv use filetype flv for output
rtmp://ustream.tv/url/key stream url and key provided by ustream.tv, justin.tv, twitch.tv, youtube, wowza, flash media server, etc

console output

ffmpeg version 2.1.3 Copyright (c) 2000-2013 the FFmpeg developers
built on Jan 21 2014 17:05:51 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
configuration: --prefix=/usr/local --extra-ldflags=-L/usr/local/lib --enable-openssl --enable-openal --enable-libxvid --enable-libx264 --enable-libwavpack --enable-libvorbis --enable-libvo-aacenc --enable-libtheora --enable-libssh --enable-librtmp --enable-libopenjpeg --enable-libopencv --enable-libmp3lame --enable-avisynth --enable-libaacplus --enable-libbluray --enable-libfaac --enable-libfdk-aac --enable-avresample --enable-gray --enable-nonfree --enable-version3 --enable-gpl
libavutil 52. 48.101 / 52. 48.101
libavcodec 55. 39.101 / 55. 39.101
libavformat 55. 19.104 / 55. 19.104
libavdevice 55. 5.100 / 55. 5.100
libavfilter 3. 90.100 / 3. 90.100
libavresample 1. 1. 0 / 1. 1. 0
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
libpostproc 52. 3.100 / 52. 3.100
Input #0, mp3, from 'http://relay1.dubstep.fm:80':
Duration: N/A, start: 0.000000, bitrate: 192 kb/s
Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 192 kb/s
Input #1, image2, from 'live/*.jpg':
Duration: 00:00:24.00, start: 0.000000, bitrate: N/A
Stream #1:0: Video: mjpeg, yuvj420p(pc), 1280x720 [SAR 72:72 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
[libx264 @ 0xa0b2960] using SAR=1/1
[libx264 @ 0xa0b2960] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0xa0b2960] profile Main, level 4.1
Output #0, mpegts, to 'udp://IP:10000?pkt_size=1316':
encoder : Lavf55.19.104
Stream #0:0: Video: h264 (libx264), yuvj420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 3000 kb/s, 90k tbn, 25 tbc
Stream #0:1: Audio: aac (libfdk_aac), 44100 Hz, stereo, s16, 192 kb/s
Stream mapping:
Stream #1:0 -> #0:0 (mjpeg -> libx264)
Stream #0:0 -> #0:1 (mp3 -> libfdk_aac)
Press [q] to stop, [?] for help
frame= 7482 fps= 25 q=12.0 size= 127133kB time=00:05:10.12 bitrate=3358.2kbits/s

to stream to ustream.tv just change to -f flv rtmp://ustream.tv/url/key and so on for the other services.

you may use any encoder you like as long as its supported by ustream.tv, justin.tv, twitch.tv, youtube, wowza, flash media server, etc

and for a little fun

when -loop 1 is set ffmpeg seems to read the file on every loop cycle, which means once ffmpeg is running and looping your image sequence, you can edit any of the individual image files and ffmpeg will stream the updated frames/images on the next loop cycle. this means you can edit/change individual frames in real time. (fight club lol)

if you want to use a single image file, for example -loop 1 -i image.png, you can then open with photoshop and make changes to layers, opacity, etc. just save the file and ffmpeg will stream it out!

note that if your using glob *.jpg for an image sequence, you can only make changes to files that were present at the time ffmpeg was executed. so just dropping another 100 images in the same directory and hoping that *.jpg will pick them up wont work, sorry :/

from what i can tell ffmpeg really hasnt been utilized in this particular way, but is good for radio station owners that want to take advantage of all available delivery methods.

(edit 04.19.14 – i have since bagged the still image, or looping video for something a bit sexier)


cheers =]