Re: [FFmpeg-user] Low latency H.264 streaming with ffmpeg

2018-03-26 Thread rameshperumal 
Greger Burman wrote
> Observation:
> x264 codec + mpegts format compared to mjpeg codec + mjpeg format adds
> about 300 ms (10 frames) latency.

Hi,

I just started to transcode the 1-minute input video(mjpeg) from the USB
camera with the below command.

time ~/bin/ffmpeg -benchmark -threads 4 -t 00:01:00.00 -f video4linux2
-input_format mjpeg -framerate 30 -i /dev/video0 -an -c:v libx264 -preset
ultrafast -tune zerolatency -thread_type 1 -r:v 30 -f null - 

Output:
ffmpeg version 3.3 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 6.2.0 (Ubuntu 6.2.0-5ubuntu12) 20161005
  configuration: --prefix=/usr --pkg-config-flags=--static
--extra-cflags=-I/usr/include --extra-ldflags=-L/usr/lib --bindir=/root/bin
--enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype
--enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264
--enable-libx265 --enable-nonfree --enable-vaapi --enable-libopus
--enable-libvpx --enable-hwaccel=h263_vaapi --enable-hwaccel=h264_vaapi
--enable-hwaccel=mpeg2_vaapi --enable-hwaccel=mpeg4_vaapi
--enable-hwaccel=vc1_vaapi --enable-hwaccel=vp8_vaapi
--enable-hwaccel=vp9_vaapi --enable-hwaccel=wmv3_vaapi
--enable-decoder='vp8,vp9'
  libavutil  55. 58.100 / 55. 58.100
  libavcodec 57. 89.100 / 57. 89.100
  libavformat57. 71.100 / 57. 71.100
  libavdevice57.  6.100 / 57.  6.100
  libavfilter 6. 82.100 /  6. 82.100
  libswscale  4.  6.100 /  4.  6.100
  libswresample   2.  7.100 /  2.  7.100
  libpostproc54.  5.100 / 54.  5.100
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 5864.558330, bitrate: N/A
Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown),
640x480, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
No pixel format specified, yuvj422p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
[libx264 @ 0x555b636ea220] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0x555b636ea220] profile High 4:2:2, level 3.0, 4:2:2 8-bit
Output #0, null, to 'pipe:':
  Metadata:
encoder : Lavf57.71.100
Stream #0:0: Video: h264 (libx264), yuvj422p(pc), 640x480, q=-1--1, 30
fps, 30 tbn, 30 tbc
Metadata:
  encoder : Lavc57.89.100 libx264
Side data:
  cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame= 1800 fps= 30 q=-1.0 Lsize=N/A time=00:01:00.00 bitrate=N/A speed=  
1x
video:8981kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
bench: utime=5.746s
bench: maxrss=57952kB
[libx264 @ 0x555b636ea220] frame I:8 Avg QP:19.12  size: 62426
[libx264 @ 0x555b636ea220] frame P:1792  Avg QP:22.09  size:  4853
[libx264 @ 0x555b636ea220] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 0x555b636ea220] mb P  I16..4:  1.5%  0.0%  0.0%  P16..4: 58.3% 
0.0%  0.0%  0.0%  0.0%skip:40.2%
[libx264 @ 0x555b636ea220] coded y,uvDC,uvAC intra: 29.4% 66.3% 13.1% inter:
14.5% 42.2% 8.9%
[libx264 @ 0x555b636ea220] i16 v,h,dc,p: 32% 38% 18% 12%
[libx264 @ 0x555b636ea220] i8c dc,h,v,p: 36% 23% 31% 10%
[libx264 @ 0x555b636ea220] kb/s:1226.19

real1m1.359s
user0m5.772s
sys 0m0.115s


May I know the values (bench: utime=5.746s or user0m5.772s or  sys
0m0.115s) I need to consider to measure the end-to-end transcoding latency?
I am interested in measuring the combined encode and decode latency per
video frame. Please suggest me.



--
Sent from: http://www.ffmpeg-archive.org/
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Re: [FFmpeg-user] Audio Desynchronization When Utilizing Segmentation

2018-03-26 Thread Gabriel Balaich 
> -rtbufsize 2147.48M -i audio="SPDIF/ADAT (1+2) (RME Fireface UC)" -map
> 0:0,1:0 -map 1:0 -c:v h264_nvenc -preset: llhp ^
>
> I believe only options from 19.0 - 19.1 in the ffmpeg documentation can be
> applied on a per segment basis, correct me if I'm
>
wrong.
>

Sorry I don't mean to spam but a few quick corrections to my last sent
message:

I'm not sure where I got 19.0 - 19.1, I was referring to 2.0 - 2.1 in the
formats documentation:
https://www.ffmpeg.org/ffmpeg-formats.html

I am also unsure how I managed to make one line in my block of code purple,
it was an accident, it is of no significance.
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Re: [FFmpeg-user] Audio Desynchronization When Utilizing Segmentation

2018-03-26 Thread Gabriel Balaich 
On Mon, Mar 26, 2018 at 7:27 AM, Jim Shupert 
wrote:

> On 3/25/2018 9:30 PM, Gabriel Balaich wrote:
>
>>
>> -i video="Video (00 Pro Capture HDMI 4K+)"
>>>
>>> a question - what is your capture card?
> ___
>
>
It is the Magewell Pro Capture HDMI 4K Plus:
http://www.magewell.com/pro-capture-hdmi-4k-plus

Also just a few more updates, I assumed it was something to do with
negative time stamps but that doesn't seem to be the
case. After adding -segment_format_options avoid_negative_ts=make_zero the
problem persists:

ffmpeg -y -thread_queue_size  -f dshow -video_size 3440x1440 -rtbufsize
2147.48M -framerate 100 -pixel_format nv12 ^
-itsoffset 00:00:00.015 -i video="Video (00 Pro Capture HDMI 4K+)"
-thread_queue_size  -guess_layout_max 0 -f dshow ^
-rtbufsize 2147.48M -i audio="SPDIF/ADAT (1+2) (RME Fireface UC)" -map
0:0,1:0 -map 1:0 -c:v h264_nvenc -preset: llhp ^
-pix_fmt nv12 -b:v 250M -minrate 250M -maxrate 250M -bufsize 250M -b:a 384k
-ac 2 -r 100 -vsync 1 ^
-max_muxing_queue_size  -f segment -segment_time 300 -segment_wrap 9 ^
-segment_format_options avoid_negative_ts=make_zero
C:\Users\djcim\Videos\PC\PC\PC%02d.mp4

Unless when shifting a negative time stamp to zero it is also shifts other
timestamps the same amount? I'm not really sure how
to view time stamps, so it's hard for me to know this is having any effect
at all. But if that is the case Maybe there is a way to
route that format option to only audio (per segment), but options seem
limited with -segment_format_options. Or I guess
options seem limited in general when applying any type of "option" or
effect per segment as opposed to the initial segment and
nothing after. I believe only options from 19.0 - 19.1 in the ffmpeg
documentation can be applied on a per segment basis,
correct me if I'm wrong. When trying -segment_format_options async=1 for
example it threw an error. Even if there was a way
for me to slightly delay the audio per segment perhaps I could alleviate my
issues to an extent, would be nice if I could find an
actual fix though.

I found a forum post on the "creative cow" forum by a user who seems to be
experiencing the same thing as me:
https://forums.creativecow.net/thread/291/1587

However he has a mic plugged into a camera directly, pulling video and
audio from said camera, and is still experiencing
audio drift when implementing segmentation. So I assume my issues have
nothing to do with my audio and video streams
coming from different sources. Unfortunately it seems no solution was found
in this forum post.

Every time I've thought that I hit a roadblock using ffmpeg I've always
found a way forward, even after searching for fixes for
weeks at time. I've been trying to figure out this last part for months,
things are looking dismal. Any suggestions at all, even
crazy ones, would be extremely appreciated.
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Re: [FFmpeg-user] Audio Desynchronization When Utilizing Segmentation

2018-03-26 Thread Jim Shupert 

On 3/25/2018 9:30 PM, Gabriel Balaich wrote:



-i video="Video (00 Pro Capture HDMI 4K+)"


a question - what is your capture card?
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Re: [FFmpeg-user] FFplay and MPV can't play this video but Parole can

2018-03-26 Thread Farhad Mohammadi Majd 
at 2018 Mar 25 11:31:22, Paul B Mahol (onemda at gmail.com) wrote:
> Probably issue with your video drivers/device?

I don't think it is related to such things, because I can play
everything except this one.

at 2018 Mar 25 20:47:54, Carl Eugen Hoyos (ceffmpeg at gmail.com)
wrote:
> Please upload a sample and post a link.

Are you sure it is neccessary? I give enough information, I am using
Debian 9.4

[code]
$ mpv --version

mpv 0.23.0 (C) 2000-2016 mpv/MPlayer/mplayer2 projects
 built on UNKNOWN
ffmpeg library versions:
   libavutil   55.34.101
   libavcodec  57.64.101
   libavformat 57.56.101
   libswscale  4.2.100
   libavfilter 6.65.100
   libswresample   2.3.100
ffmpeg version: 3.2.10-1~deb9u1
[/code]

If it is really neccessary, please tell me how to cut first 3min of
this video without lose its original data using ffmpeg?
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