[FFmpeg-user] need help in reducing the stream start latency in a network enviroment

[Ratheendran R]

Thanks Mortiz for your attending my query.

On Thu, Jun 1, 2017 at 1:43 PM, Moritz Barsnick <barsnick at gmx.net> wrote:

> On Wed, May 31, 2017 at 19:41:00 +0530, Ratheendran R wrote:
> > Also this is an embedded system use case and encoding happens through
> > hardware accelarators on soc fixed properties.I would like to know if we
> > can further  reduce the size of library and bypass redundant task like
> > probe and parsing metadata of mpegts streams.
>
>

> Then please be so kind and show us what you have been doing so far,
> otherwise it's hard to say where to improve. The full command line, and
> complete, uncut console output.
>
> Apologies for my ignorance.I wanted to keep it short.

configuration options used. in busybox source.
BR2_PACKAGE_FFMPEG_EXTRACONF="--disable-encoders --disable-decoders
--enable-decoder=h264  --enable-decoder=aac  --disable-bsfs
--enable-bsf=h264_mp4toannexb --disable-hwaccels --disable-indevs
--disable-outdevs --disable-muxers --enable-muxer=mpegts --disable-parsers
--enable-parser=h264 --enable-parser=aac  --enable-small --disable-network
--disable-demuxers --enable-demuxer=aac --enable-demuxer=h264
--enable-demuxer=mpegts  --disable-filters --disable-filter=aformat
--disable-filter=format --disable-filter=setpts --disable-filter=anull
--disable-filter=null --disable-filter=trim --disable-filter=atrim
--disable-avdevice --enable-network --disable-swscale --disable-swresample
--disable-avfilter --disable-bzlib --disable-openssl --disable-zlib
--enable-protocol=unix --enable-protocol=file --disable-protocol=rtp
--disable-protocol=http --disable-protocol=tcp"

o/p I got on the console.

install prefix            /usr
source path               .
C compiler
/home/hitem/Microskybell/software/source/Buildroot/output/host/usr/bin/arm-linux-gcc
C library                 uclibc
host C compiler           /usr/bin/gcc
host C library            glibc
ARCH                      arm (arm926ej-s)
big-endian                no
runtime cpu detection     yes
ARMv5TE enabled           yes
ARMv6 enabled             no
ARMv6T2 enabled           no
VFP enabled               no
NEON enabled              yes
THUMB enabled             no
debug symbols             yes
strip symbols             no
optimize for size         yes
optimizations             yes
static                    no
shared                    yes
postprocessing support    no
new filter support        no
network support           yes
threading support         pthreads
safe bitstream reader     yes
SDL support               no
opencl enabled            no
texi2html enabled         no
perl enabled              yes
pod2man enabled           yes
makeinfo enabled          no
makeinfo supports HTML    no
Enabled programs:
ffprobe
External libraries:
Enabled decoders:
aac            h264
Enabled encoders:
Enabled hwaccels:
Enabled parsers:
aac            h264
Enabled demuxers:
aac            h264            mpegts
Enabled muxers:
adts            latm            mpegts
Enabled protocols:
file            unix
Enabled filters:

Enabled bsfs:
h264_mp4toannexb
Enabled indevs:
Enabled outdevs:

-> with this library size obtained is

 libavcodec.so.56.60.100 --> 992244 bytes
 libavformat.so.56.40.101 --> 212216 bytes
 libavutil.so.54.31.100 --> 213936 bytes

so ffmpeg lib ~ 1.5 mb

People have already shared a bit:
> https://trac.ffmpeg.org/wiki/StreamingGuide#Latency
>
> I already working on  gop =10  in the encoder.

So please let me know where I can improve upon.


Ratheendran