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• Encode h264 to match existing stream

  6 juin 2013, par Diego Sánchez

  In short : I have to encode a tiny amount of video frames and stitch them in front of a much bigger h.264 stream without reencoding said stream.

  The details : I receive a multi GB transport stream containing a h.264 es and an audio es. Currently the h.264 streams are always generated using x264, and I can assume this will be the case in the future. Now I have to prepend some video frames to this stream, but am not allowed to decode/encode the whole stream ; which leaves me with the only option to find out the exact parameters I need to pass x264_encoder_open so both streams match.

  Currently what I'm doing is :

  1. Demux the original ts and extract h.264 NAL packets.
  2. When I find the first "user data unregistered" SEI packet, I parse it and find a bunch of x264 parameters.
  3. Use libavcodec to start decoding the video. That gives me the dimensions of the picture and the h264 profile and level in the AVCodecContext structure.
  4. Match all of that as best as I can in the x264_param_t structure.

  I can do some encoding with that, and the encoded video plays correctly up to the join point. When VLC is reaching the stitch point it starts throwing out the following sequence of messages and soon after stops playing :

  [h264 @ 0x7fe36cd75be0] decode_slice_header error
  
  [h264 @ 0x7fe36cd75be0] no frame!
  
  [h264 @ 0x7fe36ccc9080] Width/height changing with threads is not implemented. Update your Libav version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.

  which clearly shows that my encoded frames do not match the original ones. I've been browsing the source code and can't seem to find a way of doing this. What I have currently (besides not working), involves a lot of guesswork, so even if I could make it work with the handful of example files I have, I would be scared to deploy this in production servers.

  So the obvious question is : Is there a safe, formal way of doing this ?

  Thanks in Advance

• ffmpeg Getting image or thumbnail from video error

  18 juillet 2013, par eMatsiyana

  i have a simple site on which people upload videos, so i want to generate a simple thumbnail from an uploaded video. i have tried every trick and way to do this from a number of websites but i am failing to make the command run without problems.

  $video = $_FILES['vpopupdropin']["tmp_name"];
  
      $ffmpeg = "C:\\Ffmpeg\\ffmpeg-20130605-git-3289670-win64-static\\bin";
  
      $image = "manu.jpg";
  
      $second = 12;
  
      $size = "150x90";
  
  $command = "$ffmpeg -i $video -an -ss $second -s $size -vcodec mjpeg      $image";
  
  echo $command;
  
      shell_exec($command);
  
  
  
      if(shell_exec($command)){
  
          echo 'okay';
  
          echo &#39;<img src="http://stackoverflow.com/feeds/tag/&#39;.$image.&#39;" style='max-width: 300px; max-height: 300px' /> >&#39;;
  
          }
  
  
  
      else{
  
          echo &#39; Problem&#39;;
  
          }

  i Echoed the the command from PHP and this is what i got :
  C :\Ffmpeg\ffmpeg-20130605-git-3289670-win64-static\bin -i C :\xampp\tmp\php27F1.tmp -an -ss 12 -s 150x90 -vcodec mjpeg manu.jpg Problem

  so i took the Command above and entered it in Cmd and got this error

  [image2 @ 00000000000000003d87580] Could not open file : manu.jpg
  av_interleaved_write_frame() : Input/output error. the uploaded file transfers well to where iam saving it and plays well on the site meaning the file is not corrupt. but the thumbnail command seems to fail, i have even checked the other questions on this site but i seem to fail to get the right solution. the paths in the Command are correct and i have verified that at least

• Hikvision NVR video conversion ffmpeg

  6 août 2024, par astralmaster

  I have a Hikvision NVR that stores security camera footage that I need to display on a website. I know that Hikvision uses proprietary H.264 codec that makes it impossible to play (coherently) in popular video players, like VLC, unless you install that codec everywhere you play it.

  



  My plan was to transcode the video using ffmpeg to regular H.264 codec and AAC for audio but the produced file has the same issues as the original - no audio when playing and very disruptive video. 
So the question is, does ffmpeg support encoding from Hikvision video/audio codecs ? Or perhaps should try to convert to different web-capable codecs using ffmpeg ?
My ffmpeg command looks like this :

  



  ffmpeg -i C:\1.mp4  -c:v libx264 -preset fast -crf 30 -b:v 200k -c:a aac -strict experimental -movflags faststart -threads 0 C:\2.mp4


  



  EDIT : What's interesting is that ffplay.exe opens and plays the original video files with no problem whatsoever, even on a computer where Hikvision codecs are not isntalled, therefore I figured conversion should be possible as well ?

  



  Mediainfo output of the video file in question :

  



  General
CompleteName                     : C:\DownLoad\1.mp4
Format                           : MPEG-PS
FileSize/String                  : 8.60 MiB
Duration/String                  : 2 h 7 min
OverallBitRate/String            : 9 395 b/s
FileExtension_Invalid            : mpeg mpg m2p vob pss evo

Video
ID/String                        : 224 (0xE0)
Format                           : AVC
Format/Info                      : Advanced Video Codec
Format_Profile                   : Baseline@L4
Format_Settings                  : 1 Ref Frames
Format_Settings_CABAC/String     : No
Format_Settings_RefFrames/String : 1 frame
Format_Settings_GOP              : M=1, N=30
Duration/String                  : 2 min 0 s
Width/String                     : 1 920 pixels
Height/String                    : 1 080 pixels
DisplayAspectRatio/String        : 16:9
FrameRate_Mode/String            : Variable
ColorSpace                       : YUV
ChromaSubsampling/String         : 4:2:0
BitDepth/String                  : 8 bits
ScanType/String                  : Progressive

Audio
ID/String                        : 192 (0xC0)
Format                           : MPEG Audio
Duration/String                  : 2 h 7 min
Compression_Mode/String          : Lossy
Video_Delay/String               : -33 min 40 s


  



  Output of ffmpeg :

  



  C:\ffmpeg\bin>ffmpeg -i C:\DownLoad\1.mp4  -c:v libx264 -preset fast -crf 30 -b:v 75k -c:a aac -strict experimental -movflags faststart -threads 0 C:\DownLoad\2.mp4
ffmpeg version N-86537-gae6f6d4 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 7.1.0 (GCC)
  configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  libavutil      55. 66.100 / 55. 66.100
  libavcodec     57. 99.100 / 57. 99.100
  libavformat    57. 73.100 / 57. 73.100
  libavdevice    57.  7.100 / 57.  7.100
  libavfilter     6. 94.100 /  6. 94.100
  libswscale      4.  7.101 /  4.  7.101
  libswresample   2.  8.100 /  2.  8.100
  libpostproc    54.  6.100 / 54.  6.100
Input #0, mpeg, from 'C:\DownLoad\1.mp4':
  Duration: 02:07:57.93, start: 789.820800, bitrate: 9 kb/s
    Stream #0:0[0x1e0]: Video: h264 (Baseline), yuv420p(progressive), 1920x1080, 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x1c0]: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
File 'C:\DownLoad\2.mp4' already exists. Overwrite ? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (pcm_mulaw (native) -> aac (native))
Press [q] to stop, [?] for help
[aac @ 0000000002cd0280] Too many bits 8832.000000 > 6144 per frame requested, clamping to max
[libx264 @ 0000000002514c80] using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX XOP FMA4
[libx264 @ 0000000002514c80] profile High, level 4.0
[libx264 @ 0000000002514c80] 264 - core 150 r2833 df79067 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=6 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=12 lookahead_threads=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=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=30 rc=crf mbtree=1 crf=30.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'C:\DownLoad\2.mp4':
  Metadata:
    encoder         : Lavf57.73.100
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080, q=-1--1, 75 kb/s, 25 fps, 12800 tbn, 25 tbc
    Metadata:
      encoder         : Lavc57.99.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/75000 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 8000 Hz, mono, fltp, 48 kb/s
    Metadata:
      encoder         : Lavc57.99.100 aac
[mp4 @ 00000000010e9e00] Starting second pass: moving the moov atom to the beginning of the file speed= 116x
frame= 3269 fps= 66 q=-1.0 Lsize=   11086kB time=01:34:24.38 bitrate=  16.0kbits/s dup=269 drop=0 speed= 115x
video:10429kB audio:592kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.594114%
[libx264 @ 0000000002514c80] frame I:14    Avg QP:21.86  size: 59795
[libx264 @ 0000000002514c80] frame P:833   Avg QP:24.81  size:  8993
[libx264 @ 0000000002514c80] frame B:2422  Avg QP:28.70  size:   970
[libx264 @ 0000000002514c80] consecutive B-frames:  1.0%  0.2%  1.4% 97.4%
[libx264 @ 0000000002514c80] mb I  I16..4: 18.9% 66.3% 14.8%
[libx264 @ 0000000002514c80] mb P  I16..4:  4.0%  7.7%  0.4%  P16..4: 16.2%  2.0%  0.6%  0.0%  0.0%    skip:69.1%
[libx264 @ 0000000002514c80] mb B  I16..4:  0.6%  0.2%  0.0%  B16..8:  5.5%  0.1%  0.0%  direct: 0.7%  skip:92.9%  L0:44.0% L1:55.0% BI: 1.0%
[libx264 @ 0000000002514c80] 8x8 transform intra:59.0% inter:83.3%
[libx264 @ 0000000002514c80] coded y,uvDC,uvAC intra: 25.3% 36.1% 7.7% inter: 1.0% 2.3% 0.1%
[libx264 @ 0000000002514c80] i16 v,h,dc,p: 23% 24% 43% 10%
[libx264 @ 0000000002514c80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 37% 26% 23%  2%  2%  3%  2%  3%  3%
[libx264 @ 0000000002514c80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 43% 23% 12%  4%  4%  5%  4%  4%  2%
[libx264 @ 0000000002514c80] i8c dc,h,v,p: 81%  7%  9%  3%
[libx264 @ 0000000002514c80] Weighted P-Frames: Y:1.0% UV:0.0%
[libx264 @ 0000000002514c80] ref P L0: 73.6% 26.4%
[libx264 @ 0000000002514c80] ref B L0: 80.9% 19.1%
[libx264 @ 0000000002514c80] ref B L1: 90.0% 10.0%
[libx264 @ 0000000002514c80] kb/s:653.30
[aac @ 0000000002cd0280] Qavg: 64512.656

C:\ffmpeg\bin>


  



  Download link to sample :

  



  https://www.dropbox.com/s/9ccptsuiqk2ntsv/1.zip?dl=0

  



  This sample is exactly 2 minutes long, but VLC will tell you otherwise.