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• random select file in batch scrip and ffmpeg

  8 mars 2019, par Hòa Hưng Ngô

  I’m building a script to create multiple videos from multiple images and audio inputs. I want to create randomness in selecting images to audio. I found the loop when using the ffmpeg script to build the video, but it did not support random pick up. I tried to understand the script in the language of windows and found out the use of the variable $ (shuf -n1 -e e : audio *) but I could not include it in the ffmpeg loop. I really hope to have help from the community. Sincere thanks !
  This is my scenario :

  set audiorandom = $(shuf -n1 -e e:\audio\*.mp3) 
  
  : encode video 
  
  for %%i in ("%INPUT%\*.jpg") DO ffmpeg -i "%%i" -i "%%audiorandom" -threads 0 -shortest -preset ultrafast "%output%\%%~ni.mp4"

• nginx RTMP to HLS : FFMPG error when trying multiple bitrate output [on hold]

  28 mai 2014, par user3685074

  I’m currently trying to convert my RTMP Livestream into a HLS with 3 quality-settings.

  I followed this guide

  I’ve compiled my own FFMPEG and it’s working if I just convert 1 file.
  It seems libx264 isn’t able to do multiple encodings at the same time ?

  I’m using these command :

          exec /usr/local/bin/ffmpeg -i rtmp://localhost/src/$name 
  
          -c:a libfdk_aac -b:a 32k   -c:v libx264 -b:v 128K -f flv rtmp://localhost/hls/$name_low 
  
          -c:a libfdk_aac -b:a 64k   -c:v libx264 -b:v 256K -f flv rtmp://localhost/hls/$name_mid 
  
          -c:a libfdk_aac -b:a 128k  -c:v libx264 -b:v 512K -f flv rtmp://localhost/hls/$name_hi  2>>/tmp/ffmpeg.log;

  this is the output :

      ffmpeg version N-63519-g61917a1 Copyright (c) 2000-2014 the FFmpeg developers
  
        built on May 28 2014 18:06:42 with gcc 4.4.3 (Ubuntu 4.4.3-4ubuntu5.1)
  
        configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-x11grab --enable-libvpx --enable-libmp3lame --enable-librtmp --enable-libspeex --enable-libfdk_aac
  
        libavutil      52. 87.100 / 52. 87.100
  
        libavcodec     55. 65.100 / 55. 65.100
  
        libavformat    55. 41.100 / 55. 41.100
  
        libavdevice    55. 13.101 / 55. 13.101
  
        libavfilter     4.  5.100 /  4.  5.100
  
        libswscale      2.  6.100 /  2.  6.100
  
        libswresample   0. 19.100 /  0. 19.100
  
        libpostproc    52.  3.100 / 52.  3.100
  
      Metadata:
  
        Server                NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
        width                 1280.00
  
        height                720.00
  
        displayWidth          1280.00
  
        displayHeight         720.00
  
        duration              0.00
  
        framerate             25.00
  
        fps                   25.00
  
        videodatarate         390.00
  
        videocodecid          0.00
  
        audiodatarate         27.00
  
        audiocodecid          11.00
  
      Input #0, flv, from 'rtmp://localhost/src/test':
  
        Metadata:
  
          Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
          displayWidth    : 1280
  
          displayHeight   : 720
  
          fps             : 25
  
          profile         : 
  
          level           : 
  
        Duration: 00:00:00.00, start: 0.080000, bitrate: N/A
  
          Stream #0:0: Video: h264 (High), yuv420p, 1280x720, 399 kb/s, 25 fps, 25 tbr, 1k tbn, 50 tbc
  
          Stream #0:1: Audio: speex, 16000 Hz, mono, s16, 27 kb/s
  
      [libx264 @ 0x5260380] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
      [libx264 @ 0x5260380] profile High, level 3.1
  
      [libx264 @ 0x5260380] 264 - core 142 r2431 f23da7c - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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=24 lookahead_threads=4 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=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=128 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
      [libx264 @ 0x525a920] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
      Output #0, flv, to 'rtmp://localhost/hls/test_low':
  
        Metadata:
  
          Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
          displayWidth    : 1280
  
          displayHeight   : 720
  
          fps             : 25
  
          profile         : 
  
          level           : 
  
          Stream #0:0: Video: h264 (libx264), yuv420p, 1280x720, q=-1--1, 128 kb/s, 25 fps, 90k tbn, 25 tbc
  
          Metadata:
  
            encoder         : Lavc55.65.100 libx264
  
          Stream #0:1: Audio: aac (libfdk_aac), 16000 Hz, mono, s16, 32 kb/s
  
          Metadata:
  
            encoder         : Lavc55.65.100 libfdk_aac
  
      Output #1, flv, to 'rtmp://localhost/hls/test_mid':
  
        Metadata:
  
          Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
          displayWidth    : 1280
  
          displayHeight   : 720
  
          fps             : 25
  
          profile         : 
  
          level           : 
  
          Stream #1:0: Video: h264, yuv420p, 1280x720, q=-1--1, 256 kb/s, 25 fps, 90k tbn, 25 tbc
  
          Metadata:
  
            encoder         : Lavc55.65.100 libx264
  
          Stream #1:1: Audio: aac, 16000 Hz, mono, s16
  
          Metadata:
  
            encoder         : Lavc55.65.100 libfdk_aac
  
      Output #2, flv, to 'rtmp://localhost/hls/test_hi':
  
        Metadata:
  
          Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
          displayWidth    : 1280
  
          displayHeight   : 720
  
          fps             : 25
  
          profile         : 
  
          level           : 
  
          Stream #2:0: Video: h264, yuv420p, 1280x720, q=-1--1, 25 fps, 90k tbn, 25 tbc
  
          Metadata:
  
            encoder         : Lavc55.65.100 libx264
  
          Stream #2:1: Audio: aac, 16000 Hz, mono, s16
  
          Metadata:
  
            encoder         : Lavc55.65.100 libfdk_aac
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (h264 -> libx264)
  
        Stream #0:1 -> #0:1 (libspeex -> libfdk_aac)
  
        Stream #0:0 -> #1:0 (h264 -> libx264)
  
        Stream #0:1 -> #1:1 (libspeex -> libfdk_aac)
  
        Stream #0:0 -> #2:0 (h264 -> libx264)
  
        Stream #0:1 -> #2:1 (libspeex -> libfdk_aac)
  
      Error while opening encoder for output stream #1:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  I hope you can help me and sorry for my bad english.

  Greetz
  Kevin

• Access to macroblocks and motion values with libx264

  6 mars 2019, par Enock

  I have a question and I hope someone can help me.
  I want to extract all motion vectors in P_type mocroblock in a P_frame during encoding
  h264 video with libx264 (x264). libx264 uses X264Context in the function x264_frame to encode
  video. Then, I want to know how can I access to macroblocks in a picture and
  how to access to motion vectors table on this picture while using the X264Context struct.
  With MpegEncContext we can access them while using MpegEncContext struct’s mb_type, *mvs[2], mb_width, mb_height and mb_stride. But I don’t know how to have such informations (
  mb_type, *mvs[2], mb_width, mb_height and mb_stride) with X264Context struct.

  Please I need your help.

  Regards