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• How do I make youtube-dl or streamlink stop after a certain period of time when downloading a live stream

  13 janvier 2020, par Programmer4Life

  I’m the unofficial historian for a popular 24/7 live feed. I wrote a script to use streamlink (fork of livestreamer) to download the stream constantly. Then i have a script to upload the captured video to YouTube as unlisted for the stream owner. I use a shell script and have the file names be dates and times.

  I’ve also used youtube-dl. For both, The maximum captured time appears to be 6 hours because it’ll stop after that amount of time. To address this, I wrote a script to restart the capture when it stops after sleeping for 30 seconds (safety in case of runaway loop) so this isn’t an issue either.

  What i am trying to do is to either set my stream capture (whether it’s youtube-dl or streamlink it doesn’t matter) to stop after a shorter interval, say 2 hours. I could also split up the file into 3 parts but i don’t know if that would require re-encoding. If it does, that’s not an option because all of this is done on a VPS with limited resources.

  The reason I am trying to split up the files or capture in a shorter time period is because 6 hours is too dang long to easily navigate a YouTube video. On mobile, trying to seek to a specific time is near impossible. Desktop isn’t much easier because you need to be very precise.

• Compiling FFMPEG on CentOS DigitalOcean

  29 juillet 2015, par coder_uk

  I set up a DigitalOcean instance running CentOS 6.5 and successfully followed the guide to compile FFMPEG (https://trac.ffmpeg.org/wiki/CompilationGuide/Centos). Hurrah !

  But of course I realised that by default, DigitalOcean creates a root user and so ffmpeg now lives in /root/bin/ffmpeg. Which isn’t ideal because when I want to exec the ffmpeg bin from nginx, I would have to run nginx as root for it to have permission.

  Questions ...

  1) Long-shot, but presumably if I change the owner of the ffmpeg binary to nginx, it still won’t work, because nginx won’t be able to access the /root folder it is in. Correct ?

  2) I could run nginx as root (’user root’). But this seems like a very bad idea. Correct ?

  3) Which leaves me with the option of creating a new user, and then compiling ffmpeg into its home folder. But : which user ? EC2 creates ’ec2-user’, so should I make my own equivalent for DO ? But then won’t I have to run nginx as that user, else I’ll run into the same problem ?

  Or should I compile ffmpeg into the ’nginx’ home folder, if indeed it has one ? Is that how it is supposed to be done ?

  Since compiling ffmpeg takes ages, I don’t want to keep doing it, and the static files all seem very out of date. Thanks

• Video and audio stretch calculations in ffmpeg

  30 janvier 2017, par garrettlynch

  I’m doing some extreme slow motion in ffmpeg on a video, both video and audio track, but can’t quite get my calculations correct.

  The input video is 00:06:41:00 at 24fps (9624 frames).
  I need the output video to be 34:00:00:00 at 24fps (2937600 frames).

  I tried these for the video and audio :

  setpts=305.237*PTS
  
  
  
  atempo=0.5, atempo=0.5, atempo=0.5, atempo=0.5, atempo=0.5, atempo=0.5, atempo=0.5, atempo=0.5, atempo=0.807668329177057

  However the video overshoots by 00:01:19:08 and the audio I’m unsure, on one player it stops somewhere around 8 hours but on another it just continues. What are the correct formulas ?

  Also on VLC the video has grey frames between video frames - do I need to interpolate to have continuous video frames ?

  ---

  Edit by @Mulvya :

  fred-macbookpro:~ srederiquefantune$ ffmpeg -i /Users/srederiquefantune/Desktop/test.mp4 -filter_complex "[0:v]setpts=305.237*PTS, scale=320:240[v];[0:a]atempo=0.5, atempo=0.5, atempo=0.5, atempo=0.5, atempo=0.5, atempo=0.5, atempo=0.5, atempo=0.5, atempo=0.807668329177057[a]" -map "[v]" -map "[a]" /Users/srederiquefantune/Desktop/output2.mp4
  
  ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.2.1 (GCC) (Apple Inc. build 5666) (dot 3)
  
    configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libsoxr --enable-libspeex --enable-libass --enable-libbluray --enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype --enable-libfribidi --disable-libxcb --disable-libxcb-shm --disable-libxcb-xfixes --disable-indev=jack --disable-outdev=xv --disable-audiotoolbox --disable-videotoolbox --disable-sdl2 --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/gcc-4.2 --disable-filter=coreimage --disable-filter=coreimagesrc --enable-vda --disable-indev=avfoundation --arch=x86_64 --enable-yasm --enable-libx265 --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  
    libavutil      55. 34.100 / 55. 34.100
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.100 / 57. 56.100
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/srederiquefantune/Desktop/test.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
    Duration: 00:06:41.25, start: 0.000000, bitrate: 2294 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 2172 kb/s, 24 fps, 120 tbr, 90k tbn, 48 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 112 kb/s (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  [libx264 @ 0x104801200] using SAR=4/3
  
  [libx264 @ 0x104801200] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1 Cache64
  
  [libx264 @ 0x104801200] profile High, level 1.3
  
  [libx264 @ 0x104801200] 264 - core 148 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=24 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to '/Users/srederiquefantune/Desktop/output2.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.56.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 320x240 [SAR 4:3 DAR 16:9], q=-1--1, 24 fps, 12288 tbn, 24 tbc (default)
  
      Metadata:
  
        encoder         : Lavc57.64.101 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        encoder         : Lavc57.64.101 aac
  
  Stream mapping:
  
    Stream #0:0 (h264) -> setpts
  
    Stream #0:1 (aac) -> atempo
  
    scale -> Stream #0:0 (libx264)
  
    atempo -> Stream #0:1 (aac)
  
  Press [q] to stop, [?] for help
  
  [output stream 0:1 @ 0x104105420] 100 buffers queued in output stream 0:1, something may be wrong.
  
  frame=    1 fps=0.0 q=0.0 size=       3kB time=00:00:22.01 bitrate=   1.2kbits/s
  
  …
  
  frame=2938515 fps=281 q=-1.0 Lsize= 2439310kB time=35:19:08.66 bitrate= 157.2kbits/s dup=2928888 drop=1 speed=12.1x    
  
  video:389302kB audio:1994106kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.345466%
  
  [libx264 @ 0x104801200] frame I:15399 Avg QP:14.27  size: 20680
  
  [libx264 @ 0x104801200] frame P:740673 Avg QP:17.21  size:    68
  
  [libx264 @ 0x104801200] frame B:2182443 Avg QP:25.83  size:    14
  
  [libx264 @ 0x104801200] consecutive B-frames:  0.9%  0.2%  0.1% 98.8%
  
  [libx264 @ 0x104801200] mb I  I16..4:  7.9% 47.3% 44.8%
  
  [libx264 @ 0x104801200] mb P  I16..4:  0.0%  0.1%  0.1%  P16..4:  0.7%  0.1%  0.1%  0.0%  0.0%    skip:99.0%
  
  [libx264 @ 0x104801200] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.1%  0.0%  0.0%  direct: 0.0%  skip:99.9%  L0:14.0% L1:85.9% BI: 0.0%
  
  [libx264 @ 0x104801200] 8x8 transform intra:48.2% inter:52.8%
  
  [libx264 @ 0x104801200] coded y,uvDC,uvAC intra: 91.4% 90.7% 88.0% inter: 0.1% 0.1% 0.0%
  
  [libx264 @ 0x104801200] i16 v,h,dc,p: 78%  4% 11%  7%
  
  [libx264 @ 0x104801200] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 13% 17%  7%  8% 10%  7% 10% 10%
  
  [libx264 @ 0x104801200] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 13% 11%  8% 10% 11%  8% 10%  9%
  
  [libx264 @ 0x104801200] i8c dc,h,v,p: 62% 15% 16%  7%
  
  [libx264 @ 0x104801200] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x104801200] ref P L0: 87.6%  7.8%  4.0%  0.6%  0.0%
  
  [libx264 @ 0x104801200] ref B L0: 50.0% 49.6%  0.4%
  
  [libx264 @ 0x104801200] ref B L1: 91.3%  8.7%
  
  [libx264 @ 0x104801200] kb/s:26.05
  
  [aac @ 0x104802a00] Qavg: 632.499
  
  fred-macbookpro:~ srederiquefantune$