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• How can I reencode a video to match another's codec exactly ?

  24 janvier 2020, par Stephen Schrauger

  When I’m on vacation, I usually use our camcorder to record videos. Since they’re all the same format, I can use ffmpeg to concat them into one large, smooth video without re-encoding.

  However, sometimes I will use a phone or other camera to record a video (if the camcorder ran out of space/battery or was left at a hotel).

  I’d like to determine the codec, framerate, etc used by my camcorder and use those parameters to convert the phone vidoes into the same format. That way, I will be able to concatonate all the videos without re-encoding the camcorder videos.

  Using ffprobe, I found my camcorder has this encoding :

    Input #0, mpegts, from 'camcorderfile.MTS':
  
    Duration: 00:00:09.54, start: 1.936367, bitrate: 24761 kb/s
  
    Program 1 
  
      Stream #0:0[0x1011]: Video: h264 (High) (HDPR / 0x52504448), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 59.94 fps, 59.94 tbr, 90k tbn, 119.88 tbc
  
      Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 256 kb/s
  
      Stream #0:2[0x1200]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090), 1920x1080

  The phone (iPhone 5s) encoding is :

    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'mov.MOV':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      creation_time   : 2017-01-02T03:04:05.000000Z
  
      com.apple.quicktime.location.ISO6709: +12.3456-789.0123+456.789/
  
      com.apple.quicktime.make: Apple
  
      com.apple.quicktime.model: iPhone 5s
  
      com.apple.quicktime.software: 10.2.1
  
      com.apple.quicktime.creationdate: 2017-01-02T03:04:05-0700
  
    Duration: 00:00:14.38, start: 0.000000, bitrate: 11940 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 11865 kb/s, 29.98 fps, 29.97 tbr, 600 tbn, 1200 tbc (default)
  
      Metadata:
  
        creation_time   : 2017-01-02T03:04:05.000000Z
  
        handler_name    : Core Media Data Handler
  
        encoder         : H.264
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 63 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-01-02T03:04:05.000000Z
  
        handler_name    : Core Media Data Handler
  
      Stream #0:2(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-01-02T03:04:05.000000Z
  
        handler_name    : Core Media Data Handler
  
      Stream #0:3(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-01-02T03:04:05.000000Z
  
        handler_name    : Core Media Data Handler

  I’m presuming that ffmpeg will automatically take any acceptable video format, and that I only need to figure out the output settings. I think I need to use -s 1920x1080 and -pix_fmt yuv420p for the output, but what other flags do I need in order to make the phone video into the same encoding as the camcorder video ?

  Can I get some pointers as to how I can translate the ffprobe output into the flags I need to give to ffmpeg ?

  Edit : Added the entire Input #0 for both media files.

• tv unable to playback ffmpeg converted media

  27 juin 2017, par Sambir

  I am trying to convert some raw video camerafiles using the following ffmpeg commmand. after conversion the pc plays back the files without any problem. also the phone plays it back using vlc. but the tv gives unsupported format. the tv plays back all files even h265 but only this file it gives an error. any help is appreciated :

  ffmpeg command :

  ffmpeg -i 1.mov -map_metadata -1 -c:v libx264 -c:a aac -ac 2 -b:a 128k -strict -2 -crf 23 -preset veryfast -threads 0 converted/1.mp4

  and this is the ffmpeg info of the original file :

  built with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --prefix=/root/ffmpeg/target --extra-cflags='-I/root/ffmpeg/target/inclu     de -static' --extra-ldflags='-L/root/ffmpeg/target/lib -lm -static' --extra-version=Xtrea     m-Codes --enable-nonfree --enable-openssl --disable-debug --disable-shared --enable-libx2     65 --enable-static --extra-cflags=--static --disable-ffplay --disable-ffserver --disable-     doc --enable-gpl --enable-pthreads --enable-postproc --enable-libass --enable-gray --enab     le-runtime-cpudetect --enable-gnutls --enable-libmp3lame --enable-libopus --enable-libthe     ora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-bzlib --enable-zlib --e     nable-version3 --enable-libvpx --enable-libxavs --disable-devices --enable-librtmp --extr     a-libs='-lrtmp -lnettle -lhogweed -lgmp -lssl -lcrypto -lz -lc -ldl'
  
    libavutil      54. 20.100 / 54. 20.100
  
    libavcodec     56. 28.100 / 56. 28.100
  
    libavformat    56. 25.101 / 56. 25.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 12.100 /  5. 12.100
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 0
  
      compatible_brands: qt
  
      creation_time   : 2017-05-18 07:39:04
  
    Duration: 00:10:38.28, start: 0.000000, bitrate: 239010 kb/s
  
      Stream #0:0(und): Video: prores (apcn / 0x6E637061), yuv422p10le(bt709), 1920x1080, 2     36756 kb/s, SAR 1:1 DAR 16:9, 50 fps, 50 tbr, 5k tbn, 5k tbc (default)
  
      Metadata:
  
        creation_time   : 2017-05-18 07:39:04
  
        handler_name    : Core Media Data Handler
  
        encoder         : Apple ProRes 422
  
        timecode        : 00:00:00:00
  
      Stream #0:1(und): Audio: pcm_s24le (lpcm / 0x6D63706C), 44100 Hz, stereo, s32 (24 bit     ), 2116 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-05-18 07:39:04
  
        handler_name    : Core Media Data Handler
  
      Stream #0:2(und): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-05-18 07:39:04
  
        handler_name    : Core Media Data Handler
  
        timecode        : 00:00:00:00
  
  At least one output file must be specified

  After conversion i get like 1.mp4,2.mp4,3.mp4... then I concat them using concat command to one file. all went ok without any problem but the tv does not support the file.

  I found out it is encoded with apple prores so I googled some conversion commands but they also did not seem to help like this :

  yuv422p, lossless audio
  
  ffmpeg -i "input.mov" -pix_fmt "yuv422p" -vcodec libx264 -preset medium -qp 0 -acodec pcm_s16le "output_yuv422p.mkv"
  
  
  
  yuv422p, aac audio
  
  ffmpeg -i "input.mov" -pix_fmt "yuv422p" -vcodec libx264 -preset medium -qp 0 -acodec -acodec libvo_aacenc -b:a 256K "output_yuv422p.mp4"

• RTMP -> endoce using ffmpeg -> HLS,DASH

  1er juillet 2017, par Ubunkun

  I would like to do "RTMP -> endoce using ffmpeg -> HLS,DASH".

  ・OS: CentOS7
  
  ・nginx version: nginx/1.13.0
  
  　with nginx-rtmp-module
  
  ・ffmpeg
  
  ffmpeg version N-83692-gb8a7dcbde2-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.1 (Debian 5.4.1-5) 20170205
  
    configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-5 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg
  
    libavutil      55. 47.100 / 55. 47.100
  
    libavcodec     57. 81.100 / 57. 81.100
  
    libavformat    57. 66.102 / 57. 66.102
  
    libavdevice    57.  3.100 / 57.  3.100
  
    libavfilter     6. 74.100 /  6. 74.100
  
    libswscale      4.  3.101 /  4.  3.101
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100
  
  
  
  /usr/local/nginx/conf/nginx.conf
  
  rtmp {
  
    server {
  
        listen 1935;
  
        application test {
  
          live on;
  
          exec /root/ffmpeg -i rtmp://localhost/test/$name
  
          -b:v 1000k -r 30 -s 720x480 -c:v libx264 -f flv rtmp://localhost/live/$name_low;
  
        }
  
        application live {
  
          live on;
  
          hls  on;
  
          hls_path /usr/local/nginx/html/hls;
  
          hls_fragment 10s;
  
          hls_type live;
  
          dash on;
  
          dash_path /usr/local/nginx/html/dash;
  
        }
  
    }
  
  }

  When I tried "rtmp ://domain.com/live/test1", it was success. There are some segment on hls and dash folder.

  But, When I teird "rtmp ://domain.com/test/test2", it was fail.

  In error.log

  2017/07/01 22:02:03 [alert] 23951#0 : unknown process 24019 exited on signal 9

  What wrong is setting ? If you know the cause of problem, let me know how to resolve it.