user11789: I used this command to burn inside my video the timecode.
While everything looked fine, when I open my video inside Premiere it seems that my timecode doesn't match.

My fear is that the timecode processed by ffmpeg was the original of the input file but when recompressed via h264 the number of frames changed giving precedence to the h264 compression algorythms.
How can I fix it? Or better how I can have an output video that match exactly the duration and the frames of the original input file?
Sadly my input file was already an h264 mp4 stream.
The command I used is the following:
ffmpeg -i "file.mp4" -c:v libx264 -x264-params "crf=17" -preset fast -c:a copy -c:s copy -copyinkf -filter_complex "drawtext=fontfile=font.otf: timecode='00\:00\:00\:00':rate=24: text='': fontsize=56: fontcolor=white@0.9: borderw=3: bordercolor=black: x=50-text_w/2:y=50" "file2.mp4"

The full console output is the following:
ffmpeg version N-82500-g52da3f6 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.9.3 (GCC)
  configuration: --arch=x86_64 --target-os=mingw32 --cross-prefix=/root/opt/ffmpeg-cross-compile/sandbox/cross_compilers/mingw-w64-x86_64/bin/x86_64-w64-mingw32- --pkg-config=pkg-config --disable-w32t
hreads --enable-libsoxr --enable-fontconfig --enable-libass --enable-libbluray --enable-iconv --enable-libtwolame --extra-cflags=-DLIBTWOLAME_STATIC --enable-libzvbi --enable-libcaca --enable-libmodpl
ug --extra-libs=-lstdc++ --extra-libs=-lpng --enable-decklink --extra-libs=-loleaut32 --enable-libmp3lame --enable-version3 --enable-zlib --enable-librtmp --enable-libvorbis --enable-libtheora --enabl
e-libspeex --enable-libopenjpeg --enable-gnutls --enable-libgsm --enable-libfreetype --enable-libopus --enable-bzlib --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --ena
ble-libschroedinger --enable-libvpx --enable-libilbc --enable-libwavpack --enable-libwebp --enable-libgme --enable-dxva2 --enable-avisynth --enable-gray --enable-libopenh264 --enable-netcdf --enable-l
ibflite --enable-lzma --enable-libsnappy --enable-libzimg --enable-gpl --enable-libx264 --enable-libx265 --enable-frei0r --enable-filter=frei0r --enable-librubberband --enable-libvidstab --enable-libx
avs --enable-libxvid --enable-libmfx --extra-libs=-lpsapi --extra-libs=-lspeexdsp --extra-cflags='-mtune=core2' --extra-cflags=-O3 --enable-static --disable-shared --prefix=/root/opt/ffmpeg-cross-comp
ile/sandbox/cross_compilers/mingw-w64-x86_64/x86_64-w64-mingw32 --enable-nonfree --enable-libfdk-aac --enable-runtime-cpudetect
  libavutil      55. 40.100 / 55. 40.100
  libavcodec     57. 66.103 / 57. 66.103
  libavformat    57. 57.100 / 57. 57.100
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 67.100 /  6. 67.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file.mp4':
  Metadata:
    major_brand     : iso5
    minor_version   : 512
    compatible_brands: iso6mp41
  Duration: 00:51:27.38, start: 0.000000, bitrate: 3246 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 2988 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[libx264 @ 0000000003746020] using SAR=1/1
[libx264 @ 0000000003746020] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0000000003746020] profile High, level 4.0
[libx264 @ 0000000003746020] 264 - core 148 r2708 86b7198 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=
hex subme=6 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 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=1 keyint=250 keyint_min=24 scenecut=40 intra_refresh=0 rc_lookah
ead=30 rc=crf mbtree=1 crf=17.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'file2.mp4':
  Metadata:
    major_brand     : iso5
    minor_version   : 512
    compatible_brands: iso6mp41
    encoder         : Lavf57.57.100
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 24 fps, 12288 tbn, 24 tbc (default)
    Metadata:
      encoder         : Lavc57.66.103 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1(und): Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 256 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Stream mapping:
  Stream #0:0 (h264) -> drawtext
  drawtext -> Stream #0:0 (libx264)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 2105 fps= 36 q=-1.0 Lsize=   41555kB time=00:01:27.58 bitrate=3886.8kbits/s dup=2 drop=0 speed=1.49x
video:38775kB audio:2719kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.145290%
[libx264 @ 0000000003746020] frame I:11    Avg QP: 7.99  size: 70608
[libx264 @ 0000000003746020] frame P:761   Avg QP:13.37  size: 28331
[libx264 @ 0000000003746020] frame B:1333  Avg QP:14.85  size: 13030
[libx264 @ 0000000003746020] consecutive B-frames:  2.0% 40.1%  1.9% 56.1%
[libx264 @ 0000000003746020] mb I  I16..4: 49.6% 36.9% 13.5%
[libx264 @ 0000000003746020] mb P  I16..4:  9.6% 15.5%  2.1%  P16..4: 20.5%  7.4%  3.1%  0.0%  0.0%    skip:41.8%
[libx264 @ 0000000003746020] mb B  I16..4:  2.5%  3.7%  0.4%  B16..8: 17.6%  7.0%  0.8%  direct: 7.7%  skip:60.4%  L0:50.5% L1:44.4% BI: 5.1%
[libx264 @ 0000000003746020] 8x8 transform intra:56.0% inter:56.8%
[libx264 @ 0000000003746020] coded y,uvDC,uvAC intra: 37.2% 61.9% 19.6% inter: 6.6% 19.9% 0.8%
[libx264 @ 0000000003746020] i16 v,h,dc,p: 51% 24% 14% 10%
[libx264 @ 0000000003746020] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 18% 29%  3%  3%  3%  2%  3%  3%
[libx264 @ 0000000003746020] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 39% 23% 15%  4%  4%  4%  3%  4%  3%
[libx264 @ 0000000003746020] i8c dc,h,v,p: 45% 18% 29%  7%
[libx264 @ 0000000003746020] Weighted P-Frames: Y:5.8% UV:3.0%
[libx264 @ 0000000003746020] ref P L0: 77.3% 22.7%
[libx264 @ 0000000003746020] ref B L0: 87.0% 13.0%
[libx264 @ 0000000003746020] ref B L1: 97.2%  2.8%
[libx264 @ 0000000003746020] kb/s:3621.54

I re runned it to obtain the output and closed it after some seconds with [q] option ;)
EDIT: runned again keeping the video only!
ffmpeg version N-82500-g52da3f6 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.9.3 (GCC)
  configuration: --arch=x86_64 --target-os=mingw32 --cross-prefix=/root/opt/ffmpeg-cross-compile/sandbox/cross_compilers/mingw-w64-x86_64/bin/x86_64-w64-mingw32- --pkg-config=pkg-config --disable-w32t
hreads --enable-libsoxr --enable-fontconfig --enable-libass --enable-libbluray --enable-iconv --enable-libtwolame --extra-cflags=-DLIBTWOLAME_STATIC --enable-libzvbi --enable-libcaca --enable-libmodpl
ug --extra-libs=-lstdc++ --extra-libs=-lpng --enable-decklink --extra-libs=-loleaut32 --enable-libmp3lame --enable-version3 --enable-zlib --enable-librtmp --enable-libvorbis --enable-libtheora --enabl
e-libspeex --enable-libopenjpeg --enable-gnutls --enable-libgsm --enable-libfreetype --enable-libopus --enable-bzlib --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --ena
ble-libschroedinger --enable-libvpx --enable-libilbc --enable-libwavpack --enable-libwebp --enable-libgme --enable-dxva2 --enable-avisynth --enable-gray --enable-libopenh264 --enable-netcdf --enable-l
ibflite --enable-lzma --enable-libsnappy --enable-libzimg --enable-gpl --enable-libx264 --enable-libx265 --enable-frei0r --enable-filter=frei0r --enable-librubberband --enable-libvidstab --enable-libx
avs --enable-libxvid --enable-libmfx --extra-libs=-lpsapi --extra-libs=-lspeexdsp --extra-cflags='-mtune=core2' --extra-cflags=-O3 --enable-static --disable-shared --prefix=/root/opt/ffmpeg-cross-comp
ile/sandbox/cross_compilers/mingw-w64-x86_64/x86_64-w64-mingw32 --enable-nonfree --enable-libfdk-aac --enable-runtime-cpudetect
  libavutil      55. 40.100 / 55. 40.100
  libavcodec     57. 66.103 / 57. 66.103
  libavformat    57. 57.100 / 57. 57.100
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 67.100 /  6. 67.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file.mp4':
  Metadata:
    major_brand     : iso5
    minor_version   : 512
    compatible_brands: iso6mp41
  Duration: 00:51:27.38, start: 0.000000, bitrate: 3246 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 2988 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[libx264 @ 000000000315f7c0] using SAR=1/1
[libx264 @ 000000000315f7c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 000000000315f7c0] profile High, level 4.0
[libx264 @ 000000000315f7c0] 264 - core 148 r2708 86b7198 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=
hex subme=6 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 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=1 keyint=250 keyint_min=24 scenecut=40 intra_refresh=0 rc_lookah
ead=30 rc=crf mbtree=1 crf=17.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'file2.mp4':
  Metadata:
    major_brand     : iso5
    minor_version   : 512
    compatible_brands: iso6mp41
    encoder         : Lavf57.57.100
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 24 fps, 12288 tbn, 24 tbc (default)
    Metadata:
      encoder         : Lavc57.66.103 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream mapping:
  Stream #0:0 (h264) -> drawtext
  drawtext -> Stream #0:0 (libx264)
Press [q] to stop, [?] for help
frame=  843 fps= 36 q=-1.0 Lsize=   10386kB time=00:00:35.00 bitrate=2430.9kbits/s dup=2 drop=0 speed= 1.5x
video:10375kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.103293%
[libx264 @ 000000000315f7c0] frame I:4     Avg QP: 5.49  size: 41664
[libx264 @ 000000000315f7c0] frame P:285   Avg QP:12.19  size: 19489
[libx264 @ 000000000315f7c0] frame B:554   Avg QP:13.02  size:  8849
[libx264 @ 000000000315f7c0] consecutive B-frames:  2.6% 28.7%  1.8% 66.9%
[libx264 @ 000000000315f7c0] mb I  I16..4: 65.5% 27.6%  6.9%
[libx264 @ 000000000315f7c0] mb P  I16..4:  9.0% 11.3%  1.3%  P16..4: 15.5%  5.1%  2.2%  0.0%  0.0%    skip:55.6%
[libx264 @ 000000000315f7c0] mb B  I16..4:  2.4%  2.2%  0.1%  B16..8: 11.6%  4.9%  0.6%  direct: 7.1%  skip:71.0%  L0:50.3% L1:45.1% BI: 4.6%
[libx264 @ 000000000315f7c0] 8x8 transform intra:49.4% inter:53.5%
[libx264 @ 000000000315f7c0] coded y,uvDC,uvAC intra: 26.0% 54.6% 16.0% inter: 4.1% 16.1% 0.6%
[libx264 @ 000000000315f7c0] i16 v,h,dc,p: 52% 26% 14%  8%
[libx264 @ 000000000315f7c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 31% 22% 38%  1%  1%  1%  2%  1%  2%
[libx264 @ 000000000315f7c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 38% 28% 20%  2%  3%  3%  3%  2%  2%
[libx264 @ 000000000315f7c0] i8c dc,h,v,p: 49% 19% 26%  7%
[libx264 @ 000000000315f7c0] Weighted P-Frames: Y:15.4% UV:8.1%
[libx264 @ 000000000315f7c0] ref P L0: 71.5% 28.5%
[libx264 @ 000000000315f7c0] ref B L0: 84.7% 15.3%
[libx264 @ 000000000315f7c0] ref B L1: 96.2%  3.8%
[libx264 @ 000000000315f7c0] kb/s:2419.57

This is the media info I obtained:

Video
  ID                          : 1
  Format                      : AVC
  Format/Info                 : Advanced Video Codec
  Format profile              : High@L4
  Format settings, CABAC      : Yes
  Format settings, ReFrames   : 2 frames
  Codec ID                    : avc1
  Codec ID/Info               : Advanced Video Coding
  Duration                    : 50s 0ms
  Bit rate                    : 2 991 Kbps
  Width                       : 1 920 pixels
  Height                      : 1 080 pixels
  Display aspect ratio        : 16:9
Frame rate mode             : Variable
Frame rate                  : 23.976 (23976/1000) fps
Minimum frame rate          : 12.000 fps
Maximum frame rate          : 24.000 fps
  Color space                 : YUV
  Chroma subsampling          : 4:2:0
  Bit depth                   : 8 bits
  Scan type                   : Progressive
  Bits/(Pixel*Frame)          : 0.060
  Stream size                 : 17.8 MiB (100%)
  Writing library             : x264 core 148 r2708 86b7198
  Encoding settings           : cabac=1 / ref=2 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=6 / 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=0 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=1 / keyint=250 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=30 / rc=crf / mbtree=1 / crf=17.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00


user18259: You might have variable frame rate media. The time base looks pretty crazy for standard 24p media. I might hit it with MediaInfo (note the Windows GUI includes adware, but the CLI version does not) and post the output from that.

11789: <p>I used this command to burn inside my video the timecode.</p>

<p>While everything looked fine, when I open my video inside Premiere it seems that my timecode doesn't match.</p>

<p><a href="https://i.stack.imgur.com/SRHs2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SRHs2.png" alt="Timecode doesn&#39;t match!"></a></p>

<p>My fear is that the timecode processed by ffmpeg was the original of the input file but when recompressed via h264 the number of frames changed giving precedence to the h264 compression algorythms.</p>

<p>How can I fix it? Or better how I can have an output video that match exactly the duration and the frames of the original input file?</p>

<p>Sadly my input file was already an h264 mp4 stream.</p>

<p>The command I used is the following:</p>

<pre><code>ffmpeg -i "file.mp4" -c:v libx264 -x264-params "crf=17" -preset fast -c:a copy -c:s copy -copyinkf -filter_complex "drawtext=fontfile=font.otf: timecode='00\:00\:00\:00':rate=24: text='': fontsize=56: fontcolor=white@0.9: borderw=3: bordercolor=black: x=50-text_w/2:y=50" "file2.mp4"
</code></pre>

<p>The full console output is the following:</p>

<pre><code>ffmpeg version N-82500-g52da3f6 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.9.3 (GCC)
  configuration: --arch=x86_64 --target-os=mingw32 --cross-prefix=/root/opt/ffmpeg-cross-compile/sandbox/cross_compilers/mingw-w64-x86_64/bin/x86_64-w64-mingw32- --pkg-config=pkg-config --disable-w32t
hreads --enable-libsoxr --enable-fontconfig --enable-libass --enable-libbluray --enable-iconv --enable-libtwolame --extra-cflags=-DLIBTWOLAME_STATIC --enable-libzvbi --enable-libcaca --enable-libmodpl
ug --extra-libs=-lstdc++ --extra-libs=-lpng --enable-decklink --extra-libs=-loleaut32 --enable-libmp3lame --enable-version3 --enable-zlib --enable-librtmp --enable-libvorbis --enable-libtheora --enabl
e-libspeex --enable-libopenjpeg --enable-gnutls --enable-libgsm --enable-libfreetype --enable-libopus --enable-bzlib --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --ena
ble-libschroedinger --enable-libvpx --enable-libilbc --enable-libwavpack --enable-libwebp --enable-libgme --enable-dxva2 --enable-avisynth --enable-gray --enable-libopenh264 --enable-netcdf --enable-l
ibflite --enable-lzma --enable-libsnappy --enable-libzimg --enable-gpl --enable-libx264 --enable-libx265 --enable-frei0r --enable-filter=frei0r --enable-librubberband --enable-libvidstab --enable-libx
avs --enable-libxvid --enable-libmfx --extra-libs=-lpsapi --extra-libs=-lspeexdsp --extra-cflags='-mtune=core2' --extra-cflags=-O3 --enable-static --disable-shared --prefix=/root/opt/ffmpeg-cross-comp
ile/sandbox/cross_compilers/mingw-w64-x86_64/x86_64-w64-mingw32 --enable-nonfree --enable-libfdk-aac --enable-runtime-cpudetect
  libavutil      55. 40.100 / 55. 40.100
  libavcodec     57. 66.103 / 57. 66.103
  libavformat    57. 57.100 / 57. 57.100
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 67.100 /  6. 67.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file.mp4':
  Metadata:
    major_brand     : iso5
    minor_version   : 512
    compatible_brands: iso6mp41
  Duration: 00:51:27.38, start: 0.000000, bitrate: 3246 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 2988 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[libx264 @ 0000000003746020] using SAR=1/1
[libx264 @ 0000000003746020] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0000000003746020] profile High, level 4.0
[libx264 @ 0000000003746020] 264 - core 148 r2708 86b7198 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=
hex subme=6 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 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=1 keyint=250 keyint_min=24 scenecut=40 intra_refresh=0 rc_lookah
ead=30 rc=crf mbtree=1 crf=17.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'file2.mp4':
  Metadata:
    major_brand     : iso5
    minor_version   : 512
    compatible_brands: iso6mp41
    encoder         : Lavf57.57.100
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 24 fps, 12288 tbn, 24 tbc (default)
    Metadata:
      encoder         : Lavc57.66.103 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1(und): Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 256 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Stream mapping:
  Stream #0:0 (h264) -&gt; drawtext
  drawtext -&gt; Stream #0:0 (libx264)
  Stream #0:1 -&gt; #0:1 (copy)
Press [q] to stop, [?] for help
frame= 2105 fps= 36 q=-1.0 Lsize=   41555kB time=00:01:27.58 bitrate=3886.8kbits/s dup=2 drop=0 speed=1.49x
video:38775kB audio:2719kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.145290%
[libx264 @ 0000000003746020] frame I:11    Avg QP: 7.99  size: 70608
[libx264 @ 0000000003746020] frame P:761   Avg QP:13.37  size: 28331
[libx264 @ 0000000003746020] frame B:1333  Avg QP:14.85  size: 13030
[libx264 @ 0000000003746020] consecutive B-frames:  2.0% 40.1%  1.9% 56.1%
[libx264 @ 0000000003746020] mb I  I16..4: 49.6% 36.9% 13.5%
[libx264 @ 0000000003746020] mb P  I16..4:  9.6% 15.5%  2.1%  P16..4: 20.5%  7.4%  3.1%  0.0%  0.0%    skip:41.8%
[libx264 @ 0000000003746020] mb B  I16..4:  2.5%  3.7%  0.4%  B16..8: 17.6%  7.0%  0.8%  direct: 7.7%  skip:60.4%  L0:50.5% L1:44.4% BI: 5.1%
[libx264 @ 0000000003746020] 8x8 transform intra:56.0% inter:56.8%
[libx264 @ 0000000003746020] coded y,uvDC,uvAC intra: 37.2% 61.9% 19.6% inter: 6.6% 19.9% 0.8%
[libx264 @ 0000000003746020] i16 v,h,dc,p: 51% 24% 14% 10%
[libx264 @ 0000000003746020] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 18% 29%  3%  3%  3%  2%  3%  3%
[libx264 @ 0000000003746020] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 39% 23% 15%  4%  4%  4%  3%  4%  3%
[libx264 @ 0000000003746020] i8c dc,h,v,p: 45% 18% 29%  7%
[libx264 @ 0000000003746020] Weighted P-Frames: Y:5.8% UV:3.0%
[libx264 @ 0000000003746020] ref P L0: 77.3% 22.7%
[libx264 @ 0000000003746020] ref B L0: 87.0% 13.0%
[libx264 @ 0000000003746020] ref B L1: 97.2%  2.8%
[libx264 @ 0000000003746020] kb/s:3621.54
</code></pre>

<p>I re runned it to obtain the output and closed it after some seconds with [q] option ;)</p>

<p><strong>EDIT:</strong> runned again keeping the video only!</p>

<pre><code>ffmpeg version N-82500-g52da3f6 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.9.3 (GCC)
  configuration: --arch=x86_64 --target-os=mingw32 --cross-prefix=/root/opt/ffmpeg-cross-compile/sandbox/cross_compilers/mingw-w64-x86_64/bin/x86_64-w64-mingw32- --pkg-config=pkg-config --disable-w32t
hreads --enable-libsoxr --enable-fontconfig --enable-libass --enable-libbluray --enable-iconv --enable-libtwolame --extra-cflags=-DLIBTWOLAME_STATIC --enable-libzvbi --enable-libcaca --enable-libmodpl
ug --extra-libs=-lstdc++ --extra-libs=-lpng --enable-decklink --extra-libs=-loleaut32 --enable-libmp3lame --enable-version3 --enable-zlib --enable-librtmp --enable-libvorbis --enable-libtheora --enabl
e-libspeex --enable-libopenjpeg --enable-gnutls --enable-libgsm --enable-libfreetype --enable-libopus --enable-bzlib --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --ena
ble-libschroedinger --enable-libvpx --enable-libilbc --enable-libwavpack --enable-libwebp --enable-libgme --enable-dxva2 --enable-avisynth --enable-gray --enable-libopenh264 --enable-netcdf --enable-l
ibflite --enable-lzma --enable-libsnappy --enable-libzimg --enable-gpl --enable-libx264 --enable-libx265 --enable-frei0r --enable-filter=frei0r --enable-librubberband --enable-libvidstab --enable-libx
avs --enable-libxvid --enable-libmfx --extra-libs=-lpsapi --extra-libs=-lspeexdsp --extra-cflags='-mtune=core2' --extra-cflags=-O3 --enable-static --disable-shared --prefix=/root/opt/ffmpeg-cross-comp
ile/sandbox/cross_compilers/mingw-w64-x86_64/x86_64-w64-mingw32 --enable-nonfree --enable-libfdk-aac --enable-runtime-cpudetect
  libavutil      55. 40.100 / 55. 40.100
  libavcodec     57. 66.103 / 57. 66.103
  libavformat    57. 57.100 / 57. 57.100
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 67.100 /  6. 67.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file.mp4':
  Metadata:
    major_brand     : iso5
    minor_version   : 512
    compatible_brands: iso6mp41
  Duration: 00:51:27.38, start: 0.000000, bitrate: 3246 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 2988 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[libx264 @ 000000000315f7c0] using SAR=1/1
[libx264 @ 000000000315f7c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 000000000315f7c0] profile High, level 4.0
[libx264 @ 000000000315f7c0] 264 - core 148 r2708 86b7198 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=
hex subme=6 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 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=1 keyint=250 keyint_min=24 scenecut=40 intra_refresh=0 rc_lookah
ead=30 rc=crf mbtree=1 crf=17.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'file2.mp4':
  Metadata:
    major_brand     : iso5
    minor_version   : 512
    compatible_brands: iso6mp41
    encoder         : Lavf57.57.100
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 24 fps, 12288 tbn, 24 tbc (default)
    Metadata:
      encoder         : Lavc57.66.103 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream mapping:
  Stream #0:0 (h264) -&gt; drawtext
  drawtext -&gt; Stream #0:0 (libx264)
Press [q] to stop, [?] for help
frame=  843 fps= 36 q=-1.0 Lsize=   10386kB time=00:00:35.00 bitrate=2430.9kbits/s dup=2 drop=0 speed= 1.5x
video:10375kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.103293%
[libx264 @ 000000000315f7c0] frame I:4     Avg QP: 5.49  size: 41664
[libx264 @ 000000000315f7c0] frame P:285   Avg QP:12.19  size: 19489
[libx264 @ 000000000315f7c0] frame B:554   Avg QP:13.02  size:  8849
[libx264 @ 000000000315f7c0] consecutive B-frames:  2.6% 28.7%  1.8% 66.9%
[libx264 @ 000000000315f7c0] mb I  I16..4: 65.5% 27.6%  6.9%
[libx264 @ 000000000315f7c0] mb P  I16..4:  9.0% 11.3%  1.3%  P16..4: 15.5%  5.1%  2.2%  0.0%  0.0%    skip:55.6%
[libx264 @ 000000000315f7c0] mb B  I16..4:  2.4%  2.2%  0.1%  B16..8: 11.6%  4.9%  0.6%  direct: 7.1%  skip:71.0%  L0:50.3% L1:45.1% BI: 4.6%
[libx264 @ 000000000315f7c0] 8x8 transform intra:49.4% inter:53.5%
[libx264 @ 000000000315f7c0] coded y,uvDC,uvAC intra: 26.0% 54.6% 16.0% inter: 4.1% 16.1% 0.6%
[libx264 @ 000000000315f7c0] i16 v,h,dc,p: 52% 26% 14%  8%
[libx264 @ 000000000315f7c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 31% 22% 38%  1%  1%  1%  2%  1%  2%
[libx264 @ 000000000315f7c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 38% 28% 20%  2%  3%  3%  3%  2%  2%
[libx264 @ 000000000315f7c0] i8c dc,h,v,p: 49% 19% 26%  7%
[libx264 @ 000000000315f7c0] Weighted P-Frames: Y:15.4% UV:8.1%
[libx264 @ 000000000315f7c0] ref P L0: 71.5% 28.5%
[libx264 @ 000000000315f7c0] ref B L0: 84.7% 15.3%
[libx264 @ 000000000315f7c0] ref B L1: 96.2%  3.8%
[libx264 @ 000000000315f7c0] kb/s:2419.57
</code></pre>

<p>This is the media info I obtained:</p>

<blockquote>
  <p>Video<br>
  ID                          : 1<br>
  Format                      : AVC<br>
  Format/Info                 : Advanced Video Codec<br>
  Format profile              : High@L4<br>
  Format settings, CABAC      : Yes<br>
  Format settings, ReFrames   : 2 frames<br>
  Codec ID                    : avc1<br>
  Codec ID/Info               : Advanced Video Coding<br>
  Duration                    : 50s 0ms<br>
  Bit rate                    : 2 991 Kbps<br>
  Width                       : 1 920 pixels<br>
  Height                      : 1 080 pixels<br>
  Display aspect ratio        : 16:9<br>
  <strong>Frame rate mode             : Variable</strong><br>
  <strong>Frame rate                  : 23.976 (23976/1000) fps</strong><br>
  <strong>Minimum frame rate          : 12.000 fps</strong><br>
  <strong>Maximum frame rate          : 24.000 fps</strong><br>
  Color space                 : YUV<br>
  Chroma subsampling          : 4:2:0<br>
  Bit depth                   : 8 bits<br>
  Scan type                   : Progressive<br>
  Bits/(Pixel*Frame)          : 0.060<br>
  Stream size                 : 17.8 MiB (100%)<br>
  Writing library             : x264 core 148 r2708 86b7198<br>
  Encoding settings           : cabac=1 / ref=2 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=6 / 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=0 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=1 / keyint=250 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=30 / rc=crf / mbtree=1 / crf=17.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00</p>
</blockquote>
 18259: <p>You might have variable frame rate media. The time base looks pretty crazy for standard 24p media. I might hit it with <a href="https://mediaarea.net/en/MediaInfo" rel="nofollow noreferrer">MediaInfo</a> (note the Windows GUI includes adware, but the CLI version does not) and post the output from that.</p>
