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Sur d’autres sites (6055)

  • ffmpeg : how to correctly program input framerate calculation, given desired video length duration and output framerate ?

    19 septembre 2015, par user89

    Let us say that I have n pictures named as imgXY.png (where XY represent the numbers 0 to n-1, properly padded with zeros).

    From these, I would like to create a video that is t seconds long, that has an (output) framerate R.

    I want to figure out what the input framerate should be, so I do the following calculation :

    • time spent per frame : t_per_frame = t/n

    • input framerate : 1/t_per_frame = n/t

    However, when I then try to create a movie using the following command :

    ffmpeg -framerate n/t -i img%02d.png -r 30 test_output.mp4

    I don’t get a movie that is t seconds long, and only two of the frames end up getting displayed. Why is this the case ?

    The following questions were unhelpful :

    How to successfully use ffmpeg to convert images into videos

    Turning images into videos with ffmpeg

    I think I am misunderstanding what is meant by input framerate, and what is meant by output framerate. Could you help clarify ? I am using a Python script to call ffmpeg, as documented here : http://zulko.github.io/blog/2013/09/27/read-and-write-video-frames-in-python-using-ffmpeg/

    Here’s the output from the following manually executed command :

    ffmpeg -framerate 24/5 -i img%02d.png -c:v libx264 -r 30 -pix_fmt yuv420p test_output.mp4

    ffmpeg version N-75204-g314bc20 Copyright (c) 2000-2015 the FFmpeg developers
     built with gcc 4.9.3 (GCC)
     configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
    isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
    le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
    enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
    ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab
    le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
    able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --ena
    ble-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
    --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl
    e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --ena
    ble-decklink --enable-opencl --enable-zlib
     libavutil      55.  2.100 / 55.  2.100
     libavcodec     57.  1.100 / 57.  1.100
     libavformat    57.  0.100 / 57.  0.100
     libavdevice    57.  0.100 / 57.  0.100
     libavfilter     6.  1.100 /  6.  1.100
     libswscale      4.  0.100 /  4.  0.100
     libswresample   2.  0.100 /  2.  0.100
     libpostproc    54.  0.100 / 54.  0.100
    Input #0, image2, from 'img%02d.png':
     Duration: 00:00:00.42, start: 0.000000, bitrate: N/A
       Stream #0:0: Video: png, rgb24(pc), 800x400, 4.80 tbr, 4.80 tbn, 4.80 tbc
    File 'test_output.mp4' already exists. Overwrite ? [y/N] y
    [libx264 @ 0000000004f16ba0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
    AVX FMA3 AVX2 LZCNT BMI2
    [libx264 @ 0000000004f16ba0] profile High, level 3.0
    [libx264 @ 0000000004f16ba0] 264 - core 148 r2597 e86f3a1 - H.264/MPEG-4 AVC cod
    ec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 r
    ef=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_pski
    p=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 dec
    imate=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=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, mp4, to 'test_output.mp4':
     Metadata:
       encoder         : Lavf57.0.100
       Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 800x40
    0, q=-1--1, 30 fps, 15360 tbn, 30 tbc
       Metadata:
         encoder         : Lavc57.1.100 libx264
    Stream mapping:
     Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
    Press [q] to stop, [?] for help
    frame=   12 fps=0.0 q=-1.0 Lsize=       3kB time=00:00:00.33 bitrate=  62.2kbits
    /s dup=10 drop=0
    video:2kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing ove
    rhead: 60.557274%
    [libx264 @ 0000000004f16ba0] frame I:1     Avg QP:10.12  size:   566
    [libx264 @ 0000000004f16ba0] frame P:3     Avg QP:18.10  size:    62
    [libx264 @ 0000000004f16ba0] frame B:8     Avg QP:13.75  size:    22
    [libx264 @ 0000000004f16ba0] consecutive B-frames:  8.3%  0.0% 25.0% 66.7%
    [libx264 @ 0000000004f16ba0] mb I  I16..4: 99.4%  0.0%  0.6%
    [libx264 @ 0000000004f16ba0] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.0%  0.0
    %  0.0%  0.0%  0.0%    skip:99.9%
    [libx264 @ 0000000004f16ba0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.1%  0.0
    %  0.0%  direct: 0.0%  skip:99.9%  L0:37.5% L1:62.5% BI: 0.0%
    [libx264 @ 0000000004f16ba0] 8x8 transform intra:0.0% inter:0.0%
    [libx264 @ 0000000004f16ba0] coded y,uvDC,uvAC intra: 0.6% 0.0% 0.0% inter: 0.0%
    0.0% 0.0%
    [libx264 @ 0000000004f16ba0] i16 v,h,dc,p: 96%  0%  4%  0%
    [libx264 @ 0000000004f16ba0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 18% 36%  2%  2%
    3%  3%  5%  1%
    [libx264 @ 0000000004f16ba0] i8c dc,h,v,p: 100%  0%  0%  0%
    [libx264 @ 0000000004f16ba0] Weighted P-Frames: Y:0.0% UV:0.0%
    [libx264 @ 0000000004f16ba0] ref P L0: 50.0% 50.0%
    [libx264 @ 0000000004f16ba0] kb/s:18.50
  • FFMPEG - Concatenate 2 MP4 Files, one has video and audio and the other has only audio

    5 août 2016, par Avi

    I am trying to merge 2 mp4 files using FFMPEG. One of these files has both video and audio (track1.mp4), while the other one has only audio (track2.mp4). The names of these files are listed in a text file called 'filesToMerge.txt' in the following manner :

    file 'track1.mp4'
    file 'track2.mp4'

    I then execute the following ffmpeg command to merge them.

    ffmpeg -f concat -i filesToMerge.txt -c copy output.mp4

    However, the concatenated file that is generated consists of only the first file that is listed in filesToMerge.txt. That is, if track1.mp4 (which has both video and audio) is the first file in the list, then only that file makes up output.mp4 (the concatenated file produced) and vice versa.

    I would like for both files to be in output.mp4. I am using Ubuntu 14.04 (if that helps). How can I solve this problem ?

    When I run this command
    ffmpeg -i track1.mp4 -i track2.mp4 output.mp4
    I get the following

    ffmpeg version N-76944-g15206ff Copyright (c) 2000-2015 the FFmpeg developers
         built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
         configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libdcadec --enable-libfreetype --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvo-aacenc --enable-libvidstab
         libavutil      55.  9.100 / 55.  9.100
         libavcodec     57. 16.101 / 57. 16.101
         libavformat    57. 19.100 / 57. 19.100
         libavdevice    57.  0.100 / 57.  0.100
         libavfilter     6. 17.100 /  6. 17.100
         libavresample   3.  0.  0 /  3.  0.  0
         libswscale      4.  0.100 /  4.  0.100
         libswresample   2.  0.101 /  2.  0.101
         libpostproc    54.  0.100 / 54.  0.100
       Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'track1.mp4':
         Metadata:
           major_brand     : isom
           minor_version   : 512
           compatible_brands: isomiso2avc1mp41
           encoder         : Lavf56.40.101
         Duration: 00:00:10.76, start: 0.023220, bitrate: 351 kb/s
           Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 800x400 [SAR 400:533 DAR 800:533], 181 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
           Metadata:
             handler_name    : VideoHandler
           Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 194 kb/s (default)
           Metadata:
             handler_name    : SoundHandler
       Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'track2.mp4':
         Metadata:
           major_brand     : isom
           minor_version   : 512
           compatible_brands: isomiso2mp41
           creation_time   : 1970-01-01 00:00:00
           encoder         : Lavf52.32.0
         Duration: 00:00:32.21, start: 0.000000, bitrate: 46 kb/s
           Stream #1:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 43 kb/s (default)
           Metadata:
             creation_time   : 1970-01-01 00:00:00
             handler_name    : SoundHandler
       [libx264 @ 0x3950ce0] using SAR=400/533
       [libx264 @ 0x3950ce0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
       [libx264 @ 0x3950ce0] profile High, level 3.0
       [libx264 @ 0x3950ce0] 264 - core 142 r2491 24e4fed - 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=1 lookahead_threads=1 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=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, mp4, to 'output.mp4':
         Metadata:
           major_brand     : isom
           minor_version   : 512
           compatible_brands: isomiso2avc1mp41
           encoder         : Lavf57.19.100
           Stream #0:0(und): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 800x400 [SAR 400:533 DAR 800:533], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
           Metadata:
             handler_name    : VideoHandler
             encoder         : Lavc57.16.101 libx264
           Stream #0:1(und): Audio: aac (libfdk_aac) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, s16, 128 kb/s (default)
           Metadata:
             handler_name    : SoundHandler
             encoder         : Lavc57.16.101 libfdk_aac
       Stream mapping:
         Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
         Stream #0:1 -> #0:1 (aac (native) -> aac (libfdk_aac))
       Press [q] to stop, [?] for help
       frame=  270 fps= 99 q=28.0 Lsize=     382kB time=00:00:10.72 bitrate= 291.9kbits/s dup=1 drop=0    
       video:230kB audio:143kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.482656%
       [libx264 @ 0x3950ce0] frame I:2     Avg QP:18.87  size:109452
       [libx264 @ 0x3950ce0] frame P:68    Avg QP:15.09  size:   171
       [libx264 @ 0x3950ce0] frame B:200   Avg QP:23.33  size:    23
       [libx264 @ 0x3950ce0] consecutive B-frames:  1.1%  0.0%  1.1% 97.8%
       [libx264 @ 0x3950ce0] mb I  I16..4: 11.0% 39.6% 49.5%
       [libx264 @ 0x3950ce0] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  5.9%  0.1%  0.0%  0.0%  0.0%    skip:93.9%
       [libx264 @ 0x3950ce0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.3%  0.0%  0.0%  direct: 0.0%  skip:99.7%  L0:21.8% L1:78.2% BI: 0.0%
       [libx264 @ 0x3950ce0] 8x8 transform intra:39.7% inter:92.8%
       [libx264 @ 0x3950ce0] coded y,uvDC,uvAC intra: 92.0% 95.0% 73.2% inter: 0.1% 1.4% 0.0%
       [libx264 @ 0x3950ce0] i16 v,h,dc,p:  1% 30%  4% 66%
       [libx264 @ 0x3950ce0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  6% 55% 16%  2%  4%  2%  8%  2%  6%
       [libx264 @ 0x3950ce0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 18% 13%  7%  9%  7% 12%  6% 11%
       [libx264 @ 0x3950ce0] i8c dc,h,v,p: 44% 35% 10% 11%
       [libx264 @ 0x3950ce0] Weighted P-Frames: Y:0.0% UV:0.0%
       [libx264 @ 0x3950ce0] ref P L0: 98.1%  0.2%  1.1%  0.5%
       [libx264 @ 0x3950ce0] ref B L0: 85.1% 13.2%  1.7%
       [libx264 @ 0x3950ce0] ref B L1: 93.6%  6.4%
       [libx264 @ 0x3950ce0] kb/s:174.10
  • ffmpeg get machine readable output

    15 mai 2017, par J.S

    I am trying to find a way to get FFmpeg to return a machine readable output. basically, I just want to know if video conversion was successfull.

    I am calling FFmpeg from go code.

    output, err := exec.Command("ffmpeg", "-i", source, "-vcodec", "h264", "-acodec", "aac", "-strict", "-2", destination).CombinedOutput()

    The above code executes this command :

    ffmpeg -i /tmp/pitchVideo-1494844705-102.mp4 -vcodec h264 -acodec aac -strict -2 /tmp/1494844705.mp4

    I get the following output :

    ffmpeg version 2.4.3-1ubuntu1~trusty6 Copyright (c) 2000-2014 the FFmpeg developers
     built on Nov 22 2014 17:07:19 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
     configuration: --prefix=/usr --extra-version='1ubuntu1~trusty6' --build-suffix=-ffmpeg --toolchain=hardened --extra-cflags= --extra-cxxflags= --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-fontconfig --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-opengl --enable-x11grab --enable-libxvid --enable-libx265 --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libx264 --enable-libsoxr --enable-openal --enable-libopencv
     libavutil      54.  7.100 / 54.  7.100
     libavcodec     56.  1.100 / 56.  1.100
     libavformat    56.  4.101 / 56.  4.101
     libavdevice    56.  0.100 / 56.  0.100
     libavfilter     5.  1.100 /  5.  1.100
     libavresample   2.  1.  0 /  2.  1.  0
     libswscale      3.  0.100 /  3.  0.100
     libswresample   1.  1.100 /  1.  1.100
     libpostproc    53.  0.100 / 53.  0.100
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/pitchVideo-1494844705-102.mp4':
     Metadata:
       major_brand     : isom
       minor_version   : 512
       compatible_brands: isomiso2avc1mp41
       encoder         : Lavf56.40.101
     Duration: 00:00:39.28, start: 0.000000, bitrate: 2300 kb/s
       Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x480, 2231 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
       Metadata:
         handler_name    : VideoHandler
       Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 64 kb/s (default)
       Metadata:
         handler_name    : SoundHandler
    [libx264 @ 0x1e12640] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX LZCNT
    [libx264 @ 0x1e12640] profile High, level 3.0
    [libx264 @ 0x1e12640] 264 - core 142 r2389 956c8d8 - 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=1 lookahead_threads=1 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=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, mp4, to '/tmp/new.mp4':
     Metadata:
       major_brand     : isom
       minor_version   : 512
       compatible_brands: isomiso2avc1mp41
       encoder         : Lavf56.4.101
       Stream #0:0(und): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x480, q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
       Metadata:
         handler_name    : VideoHandler
         encoder         : Lavc56.1.100 libx264
       Stream #0:1(und): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, mono, fltp, 128 kb/s (default)
       Metadata:
         handler_name    : SoundHandler
         encoder         : Lavc56.1.100 aac
    Stream mapping:
     Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
     Stream #0:1 -> #0:1 (aac (native) -> aac (native))
    Press [q] to stop, [?] for help
    frame=  983 fps= 27 q=28.0 Lsize=    4134kB time=00:00:39.24 bitrate= 863.0kbits/s dup=1 drop=0    
    video:3542kB audio:565kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.646525%
    [libx264 @ 0x1e12640] frame I:9     Avg QP:19.44  size:  9936
    [libx264 @ 0x1e12640] frame P:664   Avg QP:23.58  size:  4839
    [libx264 @ 0x1e12640] frame B:310   Avg QP:25.50  size:  1045
    [libx264 @ 0x1e12640] consecutive B-frames: 56.0%  4.3%  5.2% 34.6%
    [libx264 @ 0x1e12640] mb I  I16..4: 33.9% 53.6% 12.5%
    [libx264 @ 0x1e12640] mb P  I16..4:  6.7% 10.2%  0.9%  P16..4: 50.7%  8.3%  3.0%  0.0%  0.0%    skip:20.2%
    [libx264 @ 0x1e12640] mb B  I16..4:  0.4%  0.4%  0.0%  B16..8: 41.7%  1.4%  0.1%  direct: 1.3%  skip:54.7%  L0:46.9% L1:50.4% BI: 2.8%
    [libx264 @ 0x1e12640] 8x8 transform intra:56.8% inter:76.1%
    [libx264 @ 0x1e12640] coded y,uvDC,uvAC intra: 37.0% 60.5% 13.9% inter: 17.8% 26.0% 0.3%
    [libx264 @ 0x1e12640] i16 v,h,dc,p: 23% 35% 15% 27%
    [libx264 @ 0x1e12640] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 27% 21%  4%  4%  4%  4%  5%  5%
    [libx264 @ 0x1e12640] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 32% 26% 14%  4%  5%  5%  5%  5%  4%
    [libx264 @ 0x1e12640] i8c dc,h,v,p: 53% 22% 19%  6%
    [libx264 @ 0x1e12640] Weighted P-Frames: Y:8.7% UV:3.5%
    [libx264 @ 0x1e12640] ref P L0: 73.8% 15.7%  8.4%  2.0%  0.1%
    [libx264 @ 0x1e12640] ref B L0: 92.9%  6.2%  0.9%
    [libx264 @ 0x1e12640] ref B L1: 96.1%  3.9%
    [libx264 @ 0x1e12640] kb/s:737.84

    Edit 1 : Maybe I can just check if new video file was generated. But I don’t know if that is a dependable way to do it.