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• ffmpeg clip audio interval with starting and end time

  31 mars 2017, par Raymond Huang

  I am trying to clip an MP3 between two starting points, like starting at 10 seconds and ending at 16 seconds (time interval of 6 seconds).

  I am using this command :

  ffmpeg -ss 10 -i input.mp3 -t 6 output.mp3

  The resulting output.mp3 contains the 6 seconds that I specified followed by 8 or 9 seconds of empty audio. Is there something wrong with my command ?

  Edit :

  ffmpeg -ss 10 -t 6 -i input.mp3 output.mp3 says -t is not an input option, keeping it for the next output; consider fixing your command line. and gives me a file that’s got 8 seconds of audio starting from 10s and then some 9 or 10 seconds of silence.

  ffmpeg -ss 10 -to 16 -i input.mp3 output.mp3 produces a file that is twice the length of the original - basically the same audio file repeated again.

  Testing the output :

  I used Quicktime and it has silent audio at the end. The description of the output file in finder says like 14 seconds. When I use VLC, it plays for the correct 6 seconds and stops, even though its duration in the file browser in VLC says 14. My MPlayer doesn’t work properly. I also did the preview audio in Finder, and it plays the 6 seconds properly and then stops. But the round seeker bar of the MP3 didn’t reach the end. And it also says 14 seconds instead of 6.

  My goal is to stream this 6 second file through a REST API to the front end. I want the user to be able to download this file properly. Ideally it won’t have inconsistent metadata (14 seconds instead of 6).

• Converting mkv to mp4 with ffmpeg sometimes loses video

  9 décembre 2019, par RobertW

  How can I create a universal as possible command line to convert mkv to mp4 ?

  I fixed an issue where sometimes I’d lose audio (I think) and now I’m losing video.
  This is the command I currently use (I’ve used a few, including -analyzeduration 1G -probesize 50M but I always end up with broken videos at some point) :

  if [[ $(pgrep -i ffmpeg) ]] ; then
  
    echo "FFMPEG IS ALREADY RUNNING!"
  
  else 
  
    echo "Starting mkv to mp4 conversion...";
  
      for i in /var/www/html/uploads/Videos/*/*/*/*.mkv;
  
        do name=$(echo "${i//.mkv/}");
  
        echo "$name";
  
        ffmpeg -n -i "$i" -c copy -c:a aac -movflags +faststart "${name}.mp4"; rm -v -f "${name}.mkv";
  
      done
  
  fi

  Output of running that on the specific videos I’m losing picture on :

  Starting mkv to mp4 conversion...
  
  /var/www/html/uploads/Videos/TV/Avatar The Last Airbender/Season 1/Avatar The Last Airbender - S01E02 - The Avatar Returns WEBDL-1080p
  
  ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9 (GCC)
  
    configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection' --extra-ldflags='-Wl,-z,relro -Wl,--as-needed -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld ' --extra-cflags=' ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libaom --enable-libdav1d --enable-libass --enable-libbluray --enable-libcdio --enable-libdrm --enable-libjack --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmp3lame --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzvbi --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-libmfx --enable-runtime-cpudetect
  
    libavutil      56. 31.100 / 56. 31.100
  
    libavcodec     58. 54.100 / 58. 54.100
  
    libavformat    58. 29.100 / 58. 29.100
  
    libavdevice    58.  8.100 / 58.  8.100
  
    libavfilter     7. 57.100 /  7. 57.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  5.100 /  5.  5.100
  
    libswresample   3.  5.100 /  3.  5.100
  
    libpostproc    55.  5.100 / 55.  5.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/html/uploads/Videos/TV/Avatar The Last Airbender/Season 1/Avatar The Last Airbender - S01E02 - The Avatar Returns WEBDL-1080p.mkv':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf58.29.100
  
    Duration: 00:23:59.11, start: 0.000000, bitrate: 1258 kb/s
  
      Stream #0:0(und): Video: hevc (Main 10) (hev1 / 0x31766568), yuv420p10le(tv), 1440x1080, 1124 kb/s, SAR 1:1 DAR 4:3, 23.98 fps, 23.98 tbr, 16k tbn, 23.98 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, mp4, to '/var/www/html/uploads/Videos/TV/Avatar The Last Airbender/Season 1/Avatar The Last Airbender - S01E02 - The Avatar Returns WEBDL-1080p.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf58.29.100
  
      Stream #0:0(und): Video: hevc (Main 10) (hev1 / 0x31766568), yuv420p10le(tv), 1440x1080 [SAR 1:1 DAR 4:3], q=2-31, 1124 kb/s, 23.98 fps, 23.98 tbr, 16k tbn, 16k tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
        encoder         : Lavc58.54.100 aac
  
  [mp4 @ 0x5583e9bdb8c0] Starting second pass: moving the moov atom to the beginning of the file
  
  frame=34504 fps=1260 q=-1.0 Lsize=  221105kB time=00:23:59.08 bitrate=1258.6kbits/s speed=52.5x
  
  video:197477kB audio:22515kB subtitle:0kB other streams:0kB global headers:2kB muxing overhead: 0.506059%
  
  [aac @ 0x5583e9b3f140] Qavg: 562.538

  Edit :

  The below command worked on similar files which the above command did not :

    ffmpeg -n -i "$i" -c:v libx264 -c:a aac -movflags +faststart 

  Output :

  Starting mkv to mp4 conversion...
  
  /var/www/html/uploads/Videos/TV/Avatar The Last Airbender/Season 1/Avatar The Last Airbender - S01E03 - The Southern Air Temple WEBDL-1080p
  
  ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9 (GCC)
  
    configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection' --extra-ldflags='-Wl,-z,relro -Wl,--as-needed -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld ' --extra-cflags=' ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libaom --enable-libdav1d --enable-libass --enable-libbluray --enable-libcdio --enable-libdrm --enable-libjack --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmp3lame --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzvbi --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-libmfx --enable-runtime-cpudetect
  
    libavutil      56. 31.100 / 56. 31.100
  
    libavcodec     58. 54.100 / 58. 54.100
  
    libavformat    58. 29.100 / 58. 29.100
  
    libavdevice    58.  8.100 / 58.  8.100
  
    libavfilter     7. 57.100 /  7. 57.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  5.100 /  5.  5.100
  
    libswresample   3.  5.100 /  3.  5.100
  
    libpostproc    55.  5.100 / 55.  5.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/html/uploads/Videos/TV/Avatar The Last Airbender/Season 1/Avatar The Last Airbender - S01E03 - The Southern Air Temple WEBDL-1080p.mkv':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf58.29.100
  
    Duration: 00:24:10.74, start: 0.000000, bitrate: 1354 kb/s
  
      Stream #0:0(und): Video: hevc (Main 10) (hev1 / 0x31766568), yuv420p10le(tv), 1440x1080, 1124 kb/s, SAR 1:1 DAR 4:3, 23.98 fps, 23.98 tbr, 16k tbn, 23.98 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: eac3 (ec-3 / 0x332D6365), 48000 Hz, stereo, fltp, 224 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Side data:
  
        audio service type: main
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (hevc (native) -> h264 (libx264))
  
    Stream #0:1 -> #0:1 (eac3 (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x563ef7ad5a40] using SAR=1/1
  
  [libx264 @ 0x563ef7ad5a40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  [libx264 @ 0x563ef7ad5a40] profile High 10, level 4.0, 4:2:0, 10-bit
  
  [libx264 @ 0x563ef7ad5a40] 264 - core 157 r2980 34c06d1 - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 - 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=34 lookahead_threads=5 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=23 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=81 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to '/var/www/html/uploads/Videos/TV/Avatar The Last Airbender/Season 1/Avatar The Last Airbender - S01E03 - The Southern Air Temple WEBDL-1080p.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf58.29.100
  
      Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p10le, 1440x1080 [SAR 1:1 DAR 4:3], q=-1--1, 23.98 fps, 24k tbn, 23.98 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
        encoder         : Lavc58.54.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
        encoder         : Lavc58.54.100 aac
  
      Side data:
  
        audio service type: main
  
  frame=   37 fps=0.0 q=0.0 size=       0kB time=00:00:02.09 bitrate=   0.2kbits/sframe=   72 fps= 72 q=0.0 size=       0kB time=00:00:03.54 bitrate=   0.1kbits/sframe=  103 fps= 68 q=40.0 size=       0kB time=00:00:04.84 bitrate=   0.1kbits/frame=  128 fps= 64 q=40.0 size=       0kB time=00:00:05.90 bitrate=   0.1kbits/frame=  169 fps= 66 q=40.0 size=     256kB time=00:00:07.59 bitrate= 276.2kbits/frame=  194 fps= 63 q=40.0 size=     512kB time=00:00:08.66 bitrate= 484.3kbits/frame=  241 fps= 68 q=40.0 size=     512kB time=00:00:10.60 bitrate= 395.6kbits/frame=  262 fps= 64 q=40.0 size=     512kB time=00:00:11.47 bitrate= 365.5kbits/frame=  284 fps= 62 q=40.0 size=     768kB time=00:00:12.37 bitrate= 508.5kbits/frame=  312 fps= 61 q=40.0 size=     768kB time=00:00:13.54 bitrate= 464.5kbits/frame=  341 fps= 61 q=40.0 size=    1024kB time=00:00:14.74 bitrate= 569.1kbits/frame=  373 fps= 61 q=40.0 size=    1280kB time=00:00:16.10 bitrate= 651.0kbits/frame=  398 fps= 60 q=40.0 size=    1280kB time=00:00:17.13 bitrate= 612.1kbits/frame=  419 fps= 59 q=40.0 size=    1536kB time=00:00:18.02 bitrate= 698.0kbits/frame=  433 fps= 56 q=40.0 size=    1792kB time=00:00:18.60 bitrate= 789.2kbits/frame=  456 fps= 55 q=40.0 size=    2048kB time=00:00:19.56 bitrate= 857.6kbits/frame=  469 fps= 53 q=40.0 size=    2304kB time=00:00:20.11 bitrate= 938.2kbits/frame=  486 fps= 52 q=40.0 size=    2816kB time=00:00:20.82 bitrate=1108.0kbits/frame=  504 fps= 51 q=40.0 size=    3328kB time=00:00:21.58 bitrate=1262.8kbits/frame=  522 fps= 51 q=40.0 size=    4096kB time=00:00:22.31 bitrate=1503.7kbits/frame=  545 fps= 50 q=40.0 size=    4608kB time=00:00:23.27 bitrate=1621.9kbits/frame=  570 fps= 50 q=40.0 size=    5120kB time=00:00:24.34 bitrate=1723.1kbits/frame=  597 fps= 50 q=40.0 size=    5632kB time=00:00:25.45 bitrate=1812.8kbits/frame=  619 fps= 50 q=40.0 size=    5888kB time=00:00:26.38 bitrate=1827.8kbits/frame=  650 fps= 50 q=40.0 size=    6400kB time=00:00:27.66 bitrate=1894.8kbits/frame=  674 fps= 50 q=40.0 size=    6656kB time=00:00:28.65 bitrate=1903.1kbits/frame=  701 fps= 50 q=40.0 size=    6656kB time=00:00:29.78 bitrate=1830.9kbits/frame=  734 fps= 51 q=40.0 size=    6912kB time=00:00:31.12 bitrate=1819.2kbits/frame=  754 fps= 50 q=40.0 size=    7168kB time=00:00:31.97 bitrate=1836.2kbits/frame=  778 fps= 50 q=40.0 size=    7168kB time=00:00:33.00 --SNIPPED--
  
  bitrate=1518.4kbits/frame=34775 fps= 58 q=40.0 size=  268800kB time=00:24:10.64 bitrate=1518.0kbits/[mp4 @ 0x563ef7ad45c0] Starting second pass: moving the moov atom to the beginning of the file
  
  frame=34783 fps= 58 q=-1.0 Lsize=  269967kB time=00:24:10.68 bitrate=1524.5kbits/s speed= 2.4x
  
  video:246310kB audio:22689kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.359968%
  
  [libx264 @ 0x563ef7ad5a40] frame I:651   Avg QP:27.80  size: 60711
  
  [libx264 @ 0x563ef7ad5a40] frame P:10705 Avg QP:32.02  size: 14279
  
  [libx264 @ 0x563ef7ad5a40] frame B:23427 Avg QP:37.64  size:  2554
  
  [libx264 @ 0x563ef7ad5a40] consecutive B-frames:  6.9%  8.1%  5.5% 79.6%
  
  [libx264 @ 0x563ef7ad5a40] mb I  I16..4: 29.6% 60.8%  9.6%
  
  [libx264 @ 0x563ef7ad5a40] mb P  I16..4:  7.7% 10.0%  1.1%  P16..4: 20.4%  3.8%  2.2%  0.0%  0.0%    skip:54.8%
  
  [libx264 @ 0x563ef7ad5a40] mb B  I16..4:  0.6%  0.6%  0.1%  B16..8: 13.6%  1.0%  0.2%  direct: 0.7%  skip:83.3%  L0:41.6% L1:55.3% BI: 3.1%
  
  [libx264 @ 0x563ef7ad5a40] 8x8 transform intra:54.2% inter:75.7%
  
  [libx264 @ 0x563ef7ad5a40] coded y,uvDC,uvAC intra: 29.1% 50.3% 11.9% inter: 3.4% 4.5% 0.1%
  
  [libx264 @ 0x563ef7ad5a40] i16 v,h,dc,p: 25% 29%  9% 38%
  
  [libx264 @ 0x563ef7ad5a40] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 18% 25%  4%  5%  5%  5%  5%  5%
  
  [libx264 @ 0x563ef7ad5a40] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 14% 17%  7%  8%  9%  6%  7%  4%
  
  [libx264 @ 0x563ef7ad5a40] i8c dc,h,v,p: 51% 22% 19%  9%
  
  [libx264 @ 0x563ef7ad5a40] Weighted P-Frames: Y:2.7% UV:2.1%
  
  [libx264 @ 0x563ef7ad5a40] ref P L0: 74.1% 16.9%  8.9%  0.1%
  
  [libx264 @ 0x563ef7ad5a40] ref B L0: 85.8% 11.6%  2.6%
  
  [libx264 @ 0x563ef7ad5a40] ref B L1: 96.8%  3.2%
  
  [libx264 @ 0x563ef7ad5a40] kb/s:1390.85
  
  [aac @ 0x563ef7ade100] Qavg: 572.905
  
  removed '/var/www/html/uploads/Videos/TV/Avatar The Last Airbender/Season 1/Avatar The Last Airbender - S01E03 - The Southern Air Temple WEBDL-1080p.mkv'
  
  Done transcoding!

• ffmpeg - generating thumbs results in different aspect ratio

  17 août 2023, par w--

  My ffmpeg command looks like

  



  ffmpeg -i "/tmp/assets/input.mov" -y -ss 00:00:05 -vf fps=1/5,scale=300:-1 /tmp/output/thumbs/thumb%03d.jpg


  



  input.mov has a display resolution of 16:9 even though the source resolution looks to be 1440x1080. i.e. the video plays in a player at 16:9 (not really sure how this happens)

  



  the generated thumbs in this case are 300x225 (4:3) and look distorted.

  



  How can i have it generate the thumb according to the display aspect ratio ? I was hoping for 300x169 (16:9)