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• FFmpeg youtube livestreaming [closed]

  23 janvier 2024, par T1WT

  I'm developing a project for streaming on YouTube. I use Python + ffpeg in the code. I haven’t been able to fix the problem for a month now - after a while (from 6 to 20 hours) buffering begins. In the command I use -c copy. But after this time, I came to the conclusion that most likely the buffering (namely, the stream gradually drops from speed x1 to speed x0.9 and below) is due to the disk. My server has SATA. Moreover, the problem is that the disk reaches 100% active time. And around this time the flow speed begins to drop. Moreover, the total read/write speed is only 20MB/sec. How to fix it ? Thanks for your help, I really can't stand it anymore.

  


  I’ll say right away that the potential of the project is great, now there are only 50 streams on YouTube, but then there may be more than 10,000.

  


  I tried a lot but settled on the SATA drive and

  


• ffmpeg : transmission problems / artifacts in rtsp screen grab - might be a WiFi problem

  1er décembre 2022, par Jo Kerner

  In short : Is there a way to "force" ffmpeg to not save a grabbed frame if there are transmission problems ? Or any other software that does the same and I just don't know of ?

  


  Long story :

  


  Updating my house surveillance from almost 10 years old DCS-932L cameras to Tapo C100 Cameras, I changed the image delivery method from ftp push to rtsp grab via ffmpeg.

  


  I had written a program in C++ to check for "bad" pictures from the old cameras, where parts of the picture tended to be simply black once every minute or so (I'm grabbing a pic every 2 seconds). The Tapo C100 doesn't feature ftp-push, thus I tried (after a few days trying)

  


  ffmpeg.exe -y -i rtsp://user:pass@10.0.0.%ld:554/stream1 -vframes 1 %scamera\rtsp.jpg -loglevel quiet


  


  This works absolutely perfect in my main house, which features a Fritz !Box 7590 and a set of Fritz !Powerline (510/and two 540e) repeaters, plus one WiFi repeater Fritz 600) as my phone line and the router are in the basement.

  


  In my holiday home, though, it doesn't. The Wifi is managed by a Hybrid DSL/5G - box I have no alternative to, which is a Huawei DN9245W and works as DHCP Server, because this is almost impossible to change. Everything "real" is managed by another Fritz !Box 7590, connected via ethernet, and another set of Fritz !Powerline 510 and two 540e repeaters plus half a dozen Wifi Repeaters, mostly Fritz ! 310, 450E and 600. The house was partially built with local stones, which are very iron-y, and there's a lot of metallized glass. Full set is show in Image

  


  Now, this does produce different artifacts, about two per minute or in every 15th picture, see
Image with artifacts No. 1

  


  Thinking this might be a transmission problem, I tried forcing the streamgrab via TCP, because while rtsp doesn't have error correction, TCP does :

  


  ffmpeg.exe -rtsp_transport tcp -i
rtsp://user:pass@10.0.0.%ld:554/stream1 -y -f image2 -update 1 -r
1 -vframes 1 -qscale:v 30 %scamera\rtsp.jpg -loglevel quiet


  


  Which didn't change the artifacts much, see Image with artifacts No. 2

  


  The house now has a total of 12 Cameras, six of which are each "managed" by an older Dell Optiplex Desktop bought used off ebay with an i3 or i5 processor from about 2015, which goes to about 65% load. My software will check if the grabbed picture is finished saving (to RAMdisk), rename it, check if there are artifacts, if so, drop it, if not, convert to bitmap and then compare it to previous image, guess if there's a change, mark that change with a rhombus and rate it, save that as a jpeg file, and then some other stuff that's not relevant here. See : Image of my program running with six cameras

  


  I did try grabbing keyframes only, but a bunny or deer or burglar hopping through my property doesn't produce a keyframe, so that turned out to be missing the point.

  


  I'm out of ideas here. It does work flawlessly in the main house. It doesn't in the holiday house. I can hardly install more repeaters ; I already tried mesh and not-mesh, and the problem isn't exactly wifi overload, because even with just one camera running, it still persists. In certain places. Some have no problems. Reasons ? No clue. I really hope someone has a good idea.

  


• ffmpeg way to encode h265 video that allows fast-forward play without jumps

  27 octobre 2022, par SysHex

  Let me start of by saying that this issue presents itself on a Android headset, while running a Unity app with unity video player component that plays a video on it at 2 times the speed. Hence, the issue might be related to these components and not the video file itself.

  


  I have a library of video files with properties as I will describe further down this post.

  


  When I play these files at 2x the speed , the become extremelly jumpy to the point they can't be watched.

  


  I've played with configurations such as : min-keyint=30:keyint=30:scenecut=0:open-gop=0:lossless=1 but I have to be honest and state that I have almost no clue as to what they do. I've read the documentation and understand gop, I-Frames , and the need to exist reference frames for fast seek, and almost for sure Fast playing of the file (?! maybe not ?) , but don't know how to fine tune this.

  


  Maybe I'm missing out something completely and/or someone as any advice as to what I could try ?

  


  The goal is to play these files at 2x its speed, or possibly faster.

  


  Now for the details on the mpeg4 files :

  


  Video
ID                                       : 1
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main@L5@Main
Codec ID                                 : hev1
Codec ID/Info                            : High Efficiency Video Coding
Duration                                 : 15 min 0 s
Bit rate                                 : 6 578 kb/s
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 30.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0 (Type 0)
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.026
Stream size                              : 706 MiB (98%)
Writing library                          : x265 3.5+37-07b011400:[Windows][GCC 11.2.0][64 bit] 8bit+10bit+12bit
Encoding settings                        : cpuid=1111039 / frame-threads=3 / numa-pools=8 / wpp / no-pmode / no-pme / no-psnr / no-ssim / log-level=2 / input-csp=1 / input-res=3840x2160 / interlace=0 / total-frames=0 / level-idc=0 / high-tier=1 / uhd-bd=0 / ref=4 / no-allow-non-conformance / no-repeat-headers / annexb / no-aud / no-eob / no-eos / no-hrd / info / hash=0 / no-temporal-layers / open-gop / min-keyint=25 / keyint=250 / gop-lookahead=0 / bframes=4 / b-adapt=2 / b-pyramid / bframe-bias=0 / rc-lookahead=25 / lookahead-slices=4 / scenecut=40 / no-hist-scenecut / radl=0 / no-splice / no-intra-refresh / ctu=64 / min-cu-size=8 / rect / no-amp / max-tu-size=32 / tu-inter-depth=1 / tu-intra-depth=1 / limit-tu=0 / rdoq-level=2 / dynamic-rd=0.00 / no-ssim-rd / signhide / no-tskip / nr-intra=0 / nr-inter=0 / no-constrained-intra / strong-intra-smoothing / max-merge=3 / limit-refs=3 / limit-modes / me=3 / subme=3 / merange=57 / temporal-mvp / no-frame-dup / no-hme / weightp / no-weightb / no-analyze-src-pics / deblock=0:0 / sao / no-sao-non-deblock / rd=4 / selective-sao=4 / no-early-skip / rskip / no-fast-intra / no-tskip-fast / no-cu-lossless / no-b-intra / no-splitrd-skip / rdpenalty=0 / psy-rd=2.00 / psy-rdoq=1.00 / no-rd-refine / no-lossless / cbqpoffs=0 / crqpoffs=0 / rc=crf / crf=20.0 / qcomp=0.60 / qpstep=4 / stats-write=0 / stats-read=0 / ipratio=1.40 / pbratio=1.30 / aq-mode=2 / aq-strength=1.00 / cutree / zone-count=0 / no-strict-cbr / qg-size=32 / no-rc-grain / qpmax=69 / qpmin=0 / no-const-vbv / sar=0 / overscan=0 / videoformat=5 / range=0 / colorprim=1 / transfer=1 / colormatrix=1 / chromaloc=1 / chromaloc-top=0 / chromaloc-bottom=0 / display-window=0 / cll=0,0 / min-luma=0 / max-luma=255 / log2-max-poc-lsb=8 / vui-timing-info / vui-hrd-info / slices=1 / no-opt-qp-pps / no-opt-ref-list-length-pps / no-multi-pass-opt-rps / scenecut-bias=0.05 / hist-threshold=0.03 / no-opt-cu-delta-qp / no-aq-motion / no-hdr10 / no-hdr10-opt / no-dhdr10-opt / no-idr-recovery-sei / analysis-reuse-level=0 / analysis-save-reuse-level=0 / analysis-load-reuse-level=0 / scale-factor=0 / refine-intra=0 / refine-inter=0 / refine-mv=1 / refine-ctu-distortion=0 / no-limit-sao / ctu-info=0 / no-lowpass-dct / refine-analysis-type=0 / copy-pic=1 / max-ausize-factor=1.0 / no-dynamic-refine / no-single-sei / no-hevc-aq / no-svt / no-field / qp-adaptation-range=1.00 / scenecut-aware-qp=0conformance-window-offsets / right=0 / bottom=0 / decoder-max-rate=0 / no-vbv-live-multi-pass
Language                                 : English
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709
Codec configuration box                  : hvcC

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 15 min 0 s
Source duration                          : 15 min 0 s
Source_Duration_LastFrame                : -12 ms
Bit rate mode                            : Constant
Bit rate                                 : 128 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 13.8 MiB (2%)
Source stream size                       : 13.8 MiB (2%)
Default                                  : Yes
Alternate group                          : 1
mdhd_Duration                            : 900233