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  • ffmpeg : trim / concat results in different length videos

    4 mai 2019, par Mads Lee Jensen

    Im experimenting with the trim and concat filters.

    I wanted to simply split up a video into X chunks, and concat it again. I expected the result would be a video with same frames / duration.

    So i have a video encoded with 1 fps and contains 3 frames, the duration of this video is 3 seconds.

    i run the following script

    ffmpeg -y -i fps.mp4 -an -filter_complex "[0:v]trim=0:1[v1];[0:v]trim=1:2[v2];[0:v]trim=2:3[v3];[v1][v2][v3]  concat=n=3:v=1 [out]" -map [out] out.mp4

    The result is a video with a duration of 4 seconds to inspect the problem i called :

    ffprobe -print_format json -show_frames out.mp4

    It shows that there is now 4 frames ?? (here is the dump)

    ffprobe version 4.1.3 Copyright (c) 2007-2019 the FFmpeg developers
    
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.3)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
    
  libavutil      56. 22.100 / 56. 22.100
    
  libavcodec     58. 35.100 / 58. 35.100
    
  libavformat    58. 20.100 / 58. 20.100
    
  libavdevice    58.  5.100 / 58.  5.100
    
  libavfilter     7. 40.101 /  7. 40.101
    
  libavresample   4.  0.  0 /  4.  0.  0
    
  libswscale      5.  3.100 /  5.  3.100
    
  libswresample   3.  3.100 /  3.  3.100
    
  libpostproc    55.  3.100 / 55.  3.100
    
{
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf58.20.100
    
  Duration: 00:00:04.00, start: 0.000000, bitrate: 4 kb/s
    
    Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv444p, 100x100, 2 kb/s, 1 fps, 1 tbr, 16384 tbn, 2 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    "frames": [
    
        {
    
            "media_type": "video",
    
            "stream_index": 0,
    
            "key_frame": 1,
    
            "pkt_pts": 0,
    
            "pkt_pts_time": "0.000000",
    
            "pkt_dts": 0,
    
            "pkt_dts_time": "0.000000",
    
            "best_effort_timestamp": 0,
    
            "best_effort_timestamp_time": "0.000000",
    
            "pkt_duration": 16384,
    
            "pkt_duration_time": "1.000000",
    
            "pkt_pos": "48",
    
            "pkt_size": "857",
    
            "width": 100,
    
            "height": 100,
    
            "pix_fmt": "yuv444p",
    
            "pict_type": "I",
    
            "coded_picture_number": 0,
    
            "display_picture_number": 0,
    
            "interlaced_frame": 0,
    
            "top_field_first": 0,
    
            "repeat_pict": 0,
    
            "chroma_location": "left"
    
        },
    
        {
    
            "media_type": "video",
    
            "stream_index": 0,
    
            "key_frame": 0,
    
            "pkt_pts": 16384,
    
            "pkt_pts_time": "1.000000",
    
            "pkt_dts": 16384,
    
            "pkt_dts_time": "1.000000",
    
            "best_effort_timestamp": 16384,
    
            "best_effort_timestamp_time": "1.000000",
    
            "pkt_duration": 16384,
    
            "pkt_duration_time": "1.000000",
    
            "pkt_pos": "1053",
    
            "pkt_size": "146",
    
            "width": 100,
    
            "height": 100,
    
            "pix_fmt": "yuv444p",
    
            "pict_type": "B",
    
            "coded_picture_number": 2,
    
            "display_picture_number": 0,
    
            "interlaced_frame": 0,
    
            "top_field_first": 0,
    
            "repeat_pict": 0,
    
            "chroma_location": "left"
    
        },
    
        {
    
            "media_type": "video",
    
            "stream_index": 0,
    
            "key_frame": 0,
    
            "pkt_pts": 32768,
    
            "pkt_pts_time": "2.000000",
    
            "best_effort_timestamp": 32768,
    
            "best_effort_timestamp_time": "2.000000",
    
            "pkt_duration": 16384,
    
            "pkt_duration_time": "1.000000",
    
            "pkt_pos": "1199",
    
            "pkt_size": "19",
    
            "width": 100,
    
            "height": 100,
    
            "pix_fmt": "yuv444p",
    
            "pict_type": "B",
    
            "coded_picture_number": 3,
    
            "display_picture_number": 0,
    
            "interlaced_frame": 0,
    
            "top_field_first": 0,
    
            "repeat_pict": 0,
    
            "chroma_location": "left"
    
        },
    
        {
    
            "media_type": "video",
    
            "stream_index": 0,
    
            "key_frame": 0,
    
            "pkt_pts": 49152,
    
            "pkt_pts_time": "3.000000",
    
            "best_effort_timestamp": 49152,
    
            "best_effort_timestamp_time": "3.000000",
    
            "pkt_duration": 16384,
    
            "pkt_duration_time": "1.000000",
    
            "pkt_pos": "905",
    
            "pkt_size": "148",
    
            "width": 100,
    
            "height": 100,
    
            "pix_fmt": "yuv444p",
    
            "pict_type": "P",
    
            "coded_picture_number": 1,
    
            "display_picture_number": 0,
    
            "interlaced_frame": 0,
    
            "top_field_first": 0,
    
            "repeat_pict": 0,
    
            "chroma_location": "left"
    
        }
    
    ]
    
}

    I tried different things, and everything seems to work fine if i split a 2 second video (still 1 fps) up and concat again. But something goes wrong when going beyond that ?

    Here is output from ffmpeg -i fps.mp4

    ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
    
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.3)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
    
  libavutil      56. 22.100 / 56. 22.100
    
  libavcodec     58. 35.100 / 58. 35.100
    
  libavformat    58. 20.100 / 58. 20.100
    
  libavdevice    58.  5.100 / 58.  5.100
    
  libavfilter     7. 40.101 /  7. 40.101
    
  libavresample   4.  0.  0 /  4.  0.  0
    
  libswscale      5.  3.100 /  5.  3.100
    
  libswresample   3.  3.100 /  3.  3.100
    
  libpostproc    55.  3.100 / 55.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'scripts/fps.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf58.20.100
    
  Duration: 00:00:03.00, start: 0.000000, bitrate: 7 kb/s
    
    Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), gbrp(tv, gbr/unknown/unknown), 100x100, 4 kb/s, 1 fps, 1 tbr, 16384 tbn, 2 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler

  • Anomalie #4328 (Fermé) : Depots inaccessibles

    6 mai 2019, par Armen Spidermian

    Spip refuse de se connecter au dépot.

    2019-05-06 13:50:01 78.230.118.204 (pid 7481) :Pri:ERREUR : Erreur connexion
    2019-05-06 13:50:02 78.230.118.204 (pid 7481) :Pri:ERREUR : Erreur connexion
    2019-05-06 13:50:02 78.230.118.204 (pid 7481) :Pri : !INFO : copie_locale : Echec recuperation https://plugins.spip.net/depots/principal.xml sur ../IMG/distant/xml/principalxml2fdc.xml status : 0

    Je n’arrive pas a comprendre d’ou ca vient...

  • How do I independently fade in/out multiple (3+) overlay texts over video using FFMPEG ?

    10 janvier 2019, par Balpreet_1988

    When I use this code the 1st text fades out when second text fades in. This should not happen in this code :

    I have tried the provided code in multiple ways but this is not working.

    ffmpeg -y -i title.mp4 -filter_complex "[0:v]drawtext=fontsize=100:fontfile=tst.ttf:fontcolor=0xDEB887:shadowcolor=black:shadowx=5:shadowy=5:text='Top 5 Upcoming Samsung':x=50:y=200,format=yuva444p,fade=t=in:st=0.2:d=1:alpha=1[ovr1];[ovr1:v]drawtext=fontsize=100:fontfile=tst.ttf:fontcolor=0xDEB887:shadowcolor=black:shadowx=5:shadowy=5:text='SmartPhones in 2019':x=50:y=400,format=yuva444p,fade=t=in:st=2.2:d=1:alpha=1[ovr2];[0][ovr2]overlay" test.mp4

    This should fade in 1st text at 0.2 seconds which should stay till the end of the video and 2nd text should fade in at 2.2 seconds and remain till end of video.

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