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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

  • Trying to concatenate multiple videos with multiple audio streams using ffmpeg

    25 avril 2019, par Toto

    I’m trying to concatenate 3 mp4 videos, each contains 3 audio streams using ffmpeg, since I couldn’t merge them with other software because of differences in the codecs private data.

    Since the files have different codecs I’m trying to use the concat video filter but I can’t seem to get it to work. The output turns out to be an unplayable file. I’m trying to specify the input files, and every media stream, then telling the software to concatenate it and copy it to the output file.

    ffmpeg -i A.mp4 -i B.mp4 -i C.mp4 -filter_complex  '[0:0] [0:1] [0:2] [0:3] [1:0] [1:1] [1:2] [1:3] [2:0] [2:1] [2:2] [2:3] concat=n=3:v=1:a=3 [v] [a1] [a2] [a3]'  -map '[v]' -map '[a1]' -map '[a2]'-map '[a3]' output.mp4

    The complete log :

    ffmpeg -i A.mp4 -i B.mp4 -i C.mp4 -filter_complex  '[0:0] [0:1] [0:2] [0:3] [1:0] [1:1] [1:2] [1:3] [2:0] [2:1] [2:2] [2:3] concat=n=3:v=1:a=3 [v] [a1] [a2] [a3]'  -map '[v]' -map '[a1]' -map '[a2]'-map '[a3]' output.mp4
    
ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers
    
  built with gcc 8.2.1 (GCC) 20190212
    
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
    
  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
    
  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 'A.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : HandBrake 0.10.1 2015030800
    
  Duration: 01:59:10.12, start: 0.000000, bitrate: 6868 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 6017 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 320 kb/s (default)
    
    Metadata:
    
      handler_name    : Stereo
    
    Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 320 kb/s
    
    Metadata:
    
      handler_name    : Surround
    
    Stream #0:3(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s
    
    Metadata:
    
      handler_name    : Stereo
    
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'B.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : HandBrake 0.10.1 2015030800
    
  Duration: 01:12:28.48, start: 0.000000, bitrate: 6846 kb/s
    
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 6001 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 320 kb/s (default)
    
    Metadata:
    
      handler_name    : Stereo
    
    Stream #1:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 320 kb/s
    
    Metadata:
    
      handler_name    : Surround
    
    Stream #1:3(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s
    
    Metadata:
    
      handler_name    : Stereo
    
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'C.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : HandBrake 0.10.1 2015030800
    
  Duration: 00:58:55.53, start: 0.000000, bitrate: 6850 kb/s
    
    Stream #2:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 6005 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #2:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 319 kb/s (default)
    
    Metadata:
    
      handler_name    : Stereo
    
    Stream #2:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 319 kb/s
    
    Metadata:
    
      handler_name    : Surround
    
    Stream #2:3(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s
    
    Metadata:
    
      handler_name    : Stereo
    
Stream mapping:
    
  Stream #0:0 (h264) -> concat:in0:v0
    
  Stream #0:1 (aac) -> concat:in0:a0
    
  Stream #0:2 (aac) -> concat:in0:a1
    
  Stream #0:3 (aac) -> concat:in0:a2
    
  Stream #1:0 (h264) -> concat:in1:v0
    
  Stream #1:1 (aac) -> concat:in1:a0
    
  Stream #1:2 (aac) -> concat:in1:a1
    
  Stream #1:3 (aac) -> concat:in1:a2
    
  Stream #2:0 (h264) -> concat:in2:v0
    
  Stream #2:1 (aac) -> concat:in2:a0
    
  Stream #2:2 (aac) -> concat:in2:a1
    
  Stream #2:3 (aac) -> concat:in2:a2
    
  concat:out:v0 -> Stream #0:0 (libx264)
    
  concat:out:a0 -> Stream #0:1 (aac)
    
  concat:out:a1 -> Stream #0:2 (aac)
    
  concat:out:a2 -> Stream #0:3 (aac)
    
Press [q] to stop, [?] for help
    
[libx264 @ 000001930c898980] using SAR=1/1
    
[libx264 @ 000001930c898980] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 000001930c898980] profile High, level 4.0, 4:2:0, 8-bit
    
[libx264 @ 000001930c898980] 264 - core 157 r2935 545de2f - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=12 lookahead_threads=2 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     : mp42
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf58.20.100
    
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)
    
    Metadata:
    
      encoder         : Lavc58.35.100 libx264
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s
    
    Metadata:
    
      encoder         : Lavc58.35.100 aac
    
    Stream #0:2: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 341 kb/s
    
    Metadata:
    
      encoder         : Lavc58.35.100 aac
    
    Stream #0:3: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s
    
    Metadata:
    
      encoder         : Lavc58.35.100 aac
    
[aac @ 000001930d3a88c0] skip_data_stream_element: Input buffer exhausted before END element found
    
Error while decoding stream #0:1: Invalid data found when processing input
    
[aac @ 000001930c89a4c0] Number of bands (48) exceeds limit (47).ate=6048.4kbits/s dup=1 drop=0 speed=0.916x
    
Error while decoding stream #2:1: Invalid data found when processing input
    
frame=450571 fps= 28 q=-1.0 Lsize=11204203kB time=04:10:34.13 bitrate=6105.1kbits/s dup=1 drop=0 speed=0.939x
    
video:10071486kB audio:1099256kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.299544%
    
[libx264 @ 000001930c898980] frame I:4679  Avg QP:20.30  size:103274
    
[libx264 @ 000001930c898980] frame P:125629 Avg QP:22.82  size: 41052
    
[libx264 @ 000001930c898980] frame B:320263 Avg QP:25.08  size: 14590
    
[libx264 @ 000001930c898980] consecutive B-frames:  2.3%  6.0%  8.8% 83.0%
    
[libx264 @ 000001930c898980] mb I  I16..4: 16.4% 78.4%  5.2%
    
[libx264 @ 000001930c898980] mb P  I16..4:  7.0% 17.1%  1.1%  P16..4: 43.0%  9.7%  4.9%  0.0%  0.0%    skip:17.3%
    
[libx264 @ 000001930c898980] mb B  I16..4:  0.8%  1.7%  0.1%  B16..8: 39.4%  3.6%  0.7%  direct: 4.3%  skip:49.4%  L0:43.8% L1:50.2% BI: 6.0%
    
[libx264 @ 000001930c898980] 8x8 transform intra:68.6% inter:84.9%
    
[libx264 @ 000001930c898980] coded y,uvDC,uvAC intra: 40.3% 64.9% 17.2% inter: 12.9% 24.2% 0.4%
    
[libx264 @ 000001930c898980] i16 v,h,dc,p: 40% 22% 10% 28%
    
[libx264 @ 000001930c898980] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 15% 23%  5%  6%  7%  5%  6%  5%
    
[libx264 @ 000001930c898980] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 16% 16%  6%  9%  9%  7%  6%  5%
    
[libx264 @ 000001930c898980] i8c dc,h,v,p: 48% 20% 26%  6%
    
[libx264 @ 000001930c898980] Weighted P-Frames: Y:8.6% UV:6.4%
    
[libx264 @ 000001930c898980] ref P L0: 58.8% 12.5% 19.8%  8.4%  0.4%
    
[libx264 @ 000001930c898980] ref B L0: 88.5%  9.1%  2.4%
    
[libx264 @ 000001930c898980] ref B L1: 96.9%  3.1%
    
[libx264 @ 000001930c898980] kb/s:5487.92
    
[aac @ 000001930c899280] Qavg: 212.043
    
[aac @ 000001930d1cfbc0] Qavg: 211.329
    
[aac @ 000001930d1ce080] Qavg: 228.685

    This is the output when trying the concat demuxer, which also produces an unplayable file.

    ffmpeg -f concat -safe 0 -i mylist.txt -map 0 -c copy concat2.mp4
    
ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers
    
  built with gcc 8.2.1 (GCC) 20190212
    
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
    
  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
    
  libswscale      5.  3.100 /  5.  3.100
    
  libswresample   3.  3.100 /  3.  3.100
    
  libpostproc    55.  3.100 / 55.  3.100
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000025ca95f2dc0] Auto-inserting h264_mp4toannexb bitstream filter
    
Input #0, concat, from 'mylist.txt':
    
  Duration: N/A, start: 0.000000, bitrate: 6850 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 6017 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 320 kb/s
    
    Metadata:
    
      handler_name    : Stereo
    
    Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 320 kb/s
    
    Metadata:
    
      handler_name    : Surround
    
    Stream #0:3(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s
    
    Metadata:
    
      handler_name    : Stereo
    
Output #0, mp4, to 'concat2.mp4':
    
  Metadata:
    
    encoder         : Lavf58.20.100
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 6017 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 90k tbc
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 320 kb/s
    
    Metadata:
    
      handler_name    : Stereo
    
    Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 320 kb/s
    
    Metadata:
    
      handler_name    : Surround
    
    Stream #0:3(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s
    
    Metadata:
    
      handler_name    : Stereo
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:1 -> #0:1 (copy)
    
  Stream #0:2 -> #0:2 (copy)
    
  Stream #0:3 -> #0:3 (copy)
    
Press [q] to stop, [?] for help
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000025ca95f9480] Auto-inserting h264_mp4toannexb bitstream filter4x
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000025ca95f9480] Auto-inserting h264_mp4toannexb bitstream filter5x
    
frame=450570 fps=1251 q=-1.0 Lsize=12591157kB time=04:10:34.11 bitrate=6860.8kbits/s speed=41.7x
    
video:11029679kB audio:1527897kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.267411%

  • Mac build ffmpeg for Android

    23 avril 2019, par Liu Silong

    I want to compile ffmpeg on my Mac. The ndk version is r19c and the FFmpeg version is 4.1.3. The build script is copied from this article. But there are some problems when compiling, as follows：

    Thanks！！！

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