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• PHP NetSSH2 command dropped after few minutes

  1er février 2020, par Hamed

  I have an Ubuntu 18.04 server,
  I want to run a ffmpeg command via remote SSH with PHP.
  After around 5 minutes process dropped,
  but it wasn’t returned any error.
  I’ve tested it directly from ssh and there wasn’t any problem.
  Also I’ve increased SSH Connection timeout but my problem is still.

  $ssh = new Net_SSH2('IP_ADDRESS');
  
  $ssh->login('root', 'PASSWORD') or die("Login failed");
  
  $command = "sudo ffmpeg -y -i $path/$film -vf subtitles=$path/$subtitle -vcodec h264 -crf 25 $path/$subtitled";
  
  $ssh->exec($command);

• Using ffmpeg to generate multiple resolutions with the exact same keyframe positions

  2 novembre 2014, par bacon overlord

  There are a bunch of resources on how to use ffmpeg to convert X to Y and so forth but I can’t seem to be able to generate different resolutions of the same file with the same keyframe and frame positions.

  The keyframe positions are important because they allow the player to jump from one bitrate to another.

  These videos are intended for Flash.

  I keep on getting results like this from the validation tool.

  failed on frame 1670
  
  [FrameInfo 1670, type 9, timecode 23565, seekable 1670]
  
  [FrameInfo 1670, type 9, timecode 23565, seekable 1525]

  Even worse, sometimes it takes to re-ordering the frames

  failed on frame 1
  
  [FrameInfo 1, type 9, timecode 0, seekable 1]
  
  [FrameInfo 1, type 8, timecode 0, seekable -1]

  When trying to validate the sample videos that are installed with Adobe Flash Media Server they are ok

  Comparing files
  
  0: G:\VOD\sample1_150kbps.flv
  
  1: G:\VOD\sample1_500kbps.flv
  
  2: G:\VOD\sample1_700kbps.flv
  
  3: G:\VOD\sample1_1500kbps.flv
  
  Index, Keyframes, and Timecodes are Validated across all files

  Sample ffmpeg command I run at different resolutions. Adobe Media Encoder is also producing video with different keyframe positions so I don’t know whats going on here.

  ffmpeg -i source.mp4 -vf scale=1270:720 -c:a copy output.flv

  ffmpeg 720p

  ffmpeg -i .\big_buck_bunny_1080p_surround.avi -vf scale=1280:720 -vcodec libx264 -profile:v main -acodec libvo_aacenc -b:a 128k -ac 2  big_buck_bunny_720.flv

  ffmpeg 480p

  ffmpeg -i .\big_buck_bunny_1080p_surround.avi -vf scale=854:480 -vcodec libx264 -profile:v main -acodec libvo_aacenc -b:a 128k -ac 2  big_buck_bunny_480.flv

  ffmpeg console output

  ffmpeg version N-59433-g4aa9c91 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Dec 29 2013 22:01:53 with gcc 4.8.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfi
  
  g --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopenco
  
  re-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-li
  
  bvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 59.100 / 52. 59.100
  
    libavcodec     55. 47.100 / 55. 47.100
  
    libavformat    55. 22.100 / 55. 22.100
  
    libavdevice    55.  5.102 / 55.  5.102
  
    libavfilter     4.  0.103 /  4.  0.103
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, avi, from '.\big_buck_bunny_1080p_surround.avi':
  
    Metadata:
  
      encoder         : AVI-Mux GUI 1.17.7, Aug  8 2006  20:59:17
  
      JUNK            :
  
    Duration: 00:09:56.46, start: 0.000000, bitrate: 12455 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (FMP4 / 0x34504D46), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 24 tbr, 24 tb
  
  n, 24 tbc
  
      Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1(side), fltp, 448 kb/s
  
  File 'big_buck_bunny_720.flv' already exists. Overwrite ? [y/N] Y
  
  [libx264 @ 029deec0] using SAR=1/1
  
  [libx264 @ 029deec0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 029deec0] profile Main, level 3.1
  
  [libx264 @ 029deec0] 264 - core 140 r2377 1ca7bb9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.or
  
  g/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 m
  
  e_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_thr
  
  eads=2 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 r
  
  c=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, flv, to 'big_buck_bunny_720.flv':
  
    Metadata:
  
      JUNK            :
  
      encoder         : Lavf55.22.100
  
      Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 1k tbn, 2
  
  4 tbc
  
      Stream #0:1: Audio: aac (libvo_aacenc) ([10][0][0][0] / 0x000A), 48000 Hz, stereo, s16, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg4 -> libx264)
  
    Stream #0:1 -> #0:1 (ac3 -> libvo_aacenc)
  
  Press [q] to stop, [?] for help
  
  frame=14315 fps= 73 q=-1.0 Lsize=  120952kB time=00:09:56.49 bitrate=1661.1kbits/s
  
  video:110887kB audio:9321kB subtitle:0 global headers:0kB muxing overhead 0.619082%
  
  [libx264 @ 029deec0] frame I:151   Avg QP:17.09  size:115286
  
  [libx264 @ 029deec0] frame P:5374  Avg QP:21.41  size: 14154
  
  [libx264 @ 029deec0] frame B:8790  Avg QP:25.91  size:  2284
  
  [libx264 @ 029deec0] consecutive B-frames: 11.5% 15.5% 13.3% 59.7%
  
  [libx264 @ 029deec0] mb I  I16..4: 24.0%  0.0% 76.0%
  
  [libx264 @ 029deec0] mb P  I16..4:  4.0%  0.0%  3.5%  P16..4: 29.3% 11.1%  7.1%  0.0%  0.0%    skip:45.1%
  
  [libx264 @ 029deec0] mb B  I16..4:  0.2%  0.0%  0.4%  B16..8: 22.4%  1.7%  0.4%  direct: 0.8%  skip:74.1%  L0:37.5% L1:5
  
  8.0% BI: 4.5%
  
  [libx264 @ 029deec0] coded y,uvDC,uvAC intra: 51.5% 64.4% 37.6% inter: 7.3% 10.1% 1.3%
  
  [libx264 @ 029deec0] i16 v,h,dc,p: 40% 23%  9% 28%
  
  [libx264 @ 029deec0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 18% 15%  7%  8% 10%  7%  7%  6%
  
  [libx264 @ 029deec0] i8c dc,h,v,p: 51% 21% 17% 10%
  
  [libx264 @ 029deec0] Weighted P-Frames: Y:5.9% UV:3.6%
  
  [libx264 @ 029deec0] ref P L0: 62.4% 16.9% 15.2%  5.3%  0.1%
  
  [libx264 @ 029deec0] ref B L0: 89.3%  9.1%  1.7%
  
  [libx264 @ 029deec0] ref B L1: 94.3%  5.7%
  
  [libx264 @ 029deec0] kb/s:1522.96

  Validation Results

  Comparing files
  
  0: G:\VOD\big_buck_bunny_480.flv
  
  1: G:\VOD\big_buck_bunny_720.flv
  
  >> Comparison failed on frame 13181
  
  0: [FrameInfo 13181, type 9, timecode 185958, seekable 12794]
  
  1: [FrameInfo 13181, type 9, timecode 185958, seekable 13181]

• FFmpeg libx264 artifacts on moving scene

  26 mars 2020, par user13125448

  I am encoding a video with libx264 and have film noise and i have artifacts on a moving scene with a wall or background, how do you avoid these artifacts with ffmpeg.