>> My goal is for ffmpeg to be running and listening on a network port, then
>> from another machine to send the PNG sequence over the network directly into
>> ffmpeg, and have the resulting video file saved.
>> So I need to work out how to configure ffmpeg to listen on the network for a
>> sequence of PNG files, and I need to work out how to, from another machine,
>> connect to ffmpeg, tell it what the output filename should be, and then
>> transmit the PNG files.
>> Is there any way to do this? Despite many hours research I can’t see if
>> this is actually possible or not.
I’ll answer my own question as I worked it out eventually - maybe it will help
someone else in the future.
The following command sets up ffmpeg to listen on a socket on port 8000, and
when PNG images arrive, ffmpeg processes them.
ffmpeg -loglevel debug -framerate 60 -f image2pipe -i
tcp://127.0.0.1:8000?listen=1 -c:v libvpx-vp9 -pix_fmt yuva420p ffmpeg.webm
You can test it with this Python script which reads all the png files from a
directory and sends them to the socket, resulting in ffmpeg running its render
and exiting.
import glob
path = '/home/ubuntu/tmp/*.png'
files=glob.glob(path)
import socket
TCP_IP = '127.0.0.1'
TCP_PORT =8000
BUFFER_SIZE = 1024
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((TCP_IP, TCP_PORT))
print('connection closed')
for file in files:
f = open(file, 'rb')
s.send(f.read())
f.close()
s.close()
With the resulting output:
ubuntu@ip-10-0-0-196:~$ ffmpeg -y -framerate 60 -f image2pipe -i
tcp://127.0.0.1:8000?listen=1 -c:v libvpx-vp9 -pix_fmt yuva420p ffmpeg.webm
ffmpeg version 2.8.14-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg
developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1
--build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
--incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl
--enable-shared --disable-stripping --disable-decoder=libopenjpeg
--disable-decoder=libschroedinger --enable-avresample --enable-avisynth
--enable-gnutls --enable-ladspa --enable-libass --enable-libbluray
--enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite
--enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme
--enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg
--enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger
--enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex
--enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis
--enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265
--enable-libxvid --enable-libzvbi --enable-openal --enable-opengl
--enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq
--enable-frei0r --enable-libx264 --enable-libopencv
libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
libpostproc 53. 3.100 / 53. 3.100
Input #0, image2pipe, from 'tcp://127.0.0.1:8000?listen=1':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: png, rgba(pc), 800x600, 60 fps, 60 tbr, 60 tbn, 60 tbc
Incompatible pixel format 'yuva420p' for codec 'libvpx-vp9', auto-selecting
format 'yuv420p'
[libvpx-vp9 @ 0x2428e00] v1.5.0
Output #0, webm, to 'ffmpeg.webm':
Metadata:
encoder : Lavf56.40.101
Stream #0:0: Video: vp9 (libvpx-vp9), yuv420p, 800x600, q=-1--1, 200 kb/s,
60 fps, 1k tbn, 60 tbc
Metadata:
encoder : Lavc56.60.100 libvpx-vp9
Stream mapping:
Stream #0:0 -> #0:0 (png (native) -> vp9 (libvpx-vp9))
Press [q] to stop, [?] for help
[png @ 0x237e840] Invalid PNG signature 0xBA775E7E29DE8950.bitrate= 247.0kbits/s
Error while decoding stream #0:0: Invalid data found when processing input
frame= 98 fps= 18 q=0.0 Lsize= 42kB time=00:00:01.64 bitrate=
208.8kbits/s
video:41kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: 2.742833%
ubuntu@ip-10-0-0-196:~$
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