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• Blank video as the result of converting from bmp ffmpeg [duplicate]

  1er juin 2021, par Артур Клочко

  ---

  


  Update

  


  I'm sorry, as I wrote I tried to play video via different variants and got nothing, but now I send it to myself via Telegram app, and it displays there correctly. It plays via Chrome also. Seems it is not the ffmpeg problem.

  


  I uploaded it to my site, if you are not aware, please check it via stupid uwp app or Windows Media player if you are using Windows, and if you have the same problem, please feedback and I will report it as a bug

  


  https://okumaima.com/cave.mp4

  


  ---

  


  Recently I have been using ffmpeg to convert jpg file set to mp4, and it was successfully. I used the next .bat file to do it :

  


  ffmpeg -framerate 60 -i out\%%d.jpg render.mp4


  


  Now, I am trying to do the same, but with bmp files, generated as screenshots using WinApi. Images as themselves are absolutely correct - I can open them via photos app, or anything else. Images resolution is constant and equals 2002x773.

  


  So now I am using the same .bat to make video :

  


  ffmpeg -framerate 60 -i out\%%d.bmp render.mp4


  


  It generates a tiny-size video (17 kb, for 10 bmp images, 5 mb each), that is opening by UWP video app or Windows Media program, but nothing is happening - no errors, yet no video length. If there are more images, the result video size also increases, but the video still doesn't play.

  


  Full output from ffmpeg :

  


  ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.2.1 (GCC) 20200122
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --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 --enable-libopenmpt
  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
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, image2, from 'rnd\%d.bmp':
  Duration: 00:00:00.17, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: bmp, bgra, 2002x773, 60 tbr, 60 tbn, 60 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (bmp (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 052fed40] using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2
[libx264 @ 052fed40] profile High 4:4:4 Predictive, level 4.2, 4:4:4, 8-bit
[libx264 @ 052fed40] 264 - core 159 - 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=4 threads=6 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 'caev.mp4':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv444p, 2002x773, q=-1--1, 60 fps, 15360 tbn, 60 tbc
    Metadata:
      encoder         : Lavc58.54.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame=   10 fps=0.0 q=-1.0 Lsize=      16kB time=00:00:00.11 bitrate=1142.4kbits/s speed=0.151x
video:15kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 6.097639%
[libx264 @ 052fed40] frame I:1     Avg QP:18.80  size:  6840
[libx264 @ 052fed40] frame P:4     Avg QP:25.73  size:  1517
[libx264 @ 052fed40] frame B:5     Avg QP:35.54  size:   426
[libx264 @ 052fed40] consecutive B-frames: 20.0% 40.0%  0.0% 40.0%
[libx264 @ 052fed40] mb I  I16..4: 21.1% 76.3%  2.6%
[libx264 @ 052fed40] mb P  I16..4:  0.6%  0.3%  0.3%  P16..4:  0.9%  0.6%  0.1%  0.0%  0.0%    skip:97.0%
[libx264 @ 052fed40] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  4.0%  0.2%  0.0%  direct: 0.0%  skip:95.6%  L0:34.5% L1:64.6% BI: 0.9%
[libx264 @ 052fed40] 8x8 transform intra:73.8% inter:10.2%
[libx264 @ 052fed40] coded y,u,v intra: 1.8% 1.5% 1.5% inter: 0.1% 0.1% 0.1%
[libx264 @ 052fed40] i16 v,h,dc,p: 52% 47%  1%  0%
[libx264 @ 052fed40] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 47% 45%  8%  0%  0%  0%  0%  0%  0%
[libx264 @ 052fed40] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 31% 32%  3%  0%  1%  2%  5%  2%
[libx264 @ 052fed40] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 052fed40] ref P L0: 75.8%  4.1% 15.8%  4.3%
[libx264 @ 052fed40] ref B L0: 63.5% 34.8%  1.7%
[libx264 @ 052fed40] ref B L1: 97.6%  2.4%
[libx264 @ 052fed40] kb/s:721.78


  


• Windows video player cannot play cropped video from ffmpeg

  28 juillet 2019, par Chen Clarence

  I am trying to crop video with ffmpeg, I have encountered three problems.
  First, I used the following code to crop a 1080p video.

  ffmpeg -i 1080vid.avi -vf "crop=1920:1080:0:0" -c:v libx264 -crf 1 -c:a copy output.mp4

  However, in the compression rate argument, it only works if I set -crf to a positive value. If I set it to 0, then the output video cannot be played by my Windows 10 video player. However, since I am pursuing a lossless conversion, this is problematic. The output mp4 is smaller than 5% of the original size.

  The original goal was to cut a 1080*15360 video into 8 1080p videos. However, using the following code, I get unplayable output after playing with all the settings.

  ffmpeg -i sample.avi -vf "crop=1920:1080:0:0" -c:v libx264 -crf 1 -c:a copy output.mp4

  The input sample.avi is a lossless avi with bitrate larger than 1GB/s, and the output is a 70kb unplayable file. When opened, a pop up window displays :

  Choose something else to play. This item is in a format we don't support.
  
  0xc00d36b4

  The following is the command line output.

  ffmpeg version N-94396-g47b6ca0b02 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.1.1 (GCC) 20190716
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --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 --enable-libopenmpt
  
    libavutil      56. 32.100 / 56. 32.100
  
    libavcodec     58. 55.100 / 58. 55.100
  
    libavformat    58. 30.100 / 58. 30.100
  
    libavdevice    58.  9.100 / 58.  9.100
  
    libavfilter     7. 58.100 /  7. 58.100
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  Input #0, avi, from 'sample.avi':
  
    Metadata:
  
      date            : 2019-07-26T07:09:04.185811
  
    Duration: 00:00:03.00, start: 0.000000, bitrate: 11932176 kb/s
  
      Stream #0:0: Video: rawvideo, bgr24, 15360x1080, 12066071 kb/s, 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc
  
  File 'output.mp4' already exists. Overwrite ? [y/N] y
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 000002a4a910b900] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 000002a4a910b900] profile High 4:4:4 Predictive, level 6.0, 4:4:4, 8-bit
  
  [libx264 @ 000002a4a910b900] 264 - core 157 r2970 5493be8 - 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=4 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=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'output.mp4':
  
    Metadata:
  
      date            : 2019-07-26T07:09:04.185811
  
      encoder         : Lavf58.30.100
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv444p, 15360x1080, q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc
  
      Metadata:
  
        encoder         : Lavc58.55.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  frame=   90 fps=8.0 q=-1.0 Lsize=      65kB time=00:00:02.90 bitrate= 183.7kbits/s speed=0.258x
  
  video:63kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.042484%
  
  [libx264 @ 000002a4a910b900] frame I:1     Avg QP: 0.35  size: 22252
  
  [libx264 @ 000002a4a910b900] frame P:23    Avg QP: 0.09  size:   476
  
  [libx264 @ 000002a4a910b900] frame B:66    Avg QP: 0.00  size:   467
  
  [libx264 @ 000002a4a910b900] consecutive B-frames:  2.2%  0.0%  0.0% 97.8%
  
  [libx264 @ 000002a4a910b900] mb I  I16..4: 92.1%  6.5%  1.5%
  
  [libx264 @ 000002a4a910b900] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.0%  0.0%  0.0%  0.0%  0.0%    skip:100.0%
  
  [libx264 @ 000002a4a910b900] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.0%  0.0%  0.0%  direct: 0.0%  skip:100.0%
  
  [libx264 @ 000002a4a910b900] 8x8 transform intra:6.5% inter:0.0%
  
  [libx264 @ 000002a4a910b900] coded y,u,v intra: 0.4% 0.0% 0.0% inter: 0.0% 0.0% 0.0%
  
  [libx264 @ 000002a4a910b900] i16 v,h,dc,p: 96%  2%  2%  0%
  
  [libx264 @ 000002a4a910b900] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 93%  1%  7%  0%  0%  0%  0%  0%  0%
  
  [libx264 @ 000002a4a910b900] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 42% 25% 31%  0%  0%  0%  0%  0%  0%
  
  [libx264 @ 000002a4a910b900] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 000002a4a910b900] kb/s:170.49

• FFmpeg Time Skipping after concat

  18 septembre 2017, par Manul Hüttinger

  i am trying to concatenate videos and in my resulting Videos i have the issue that at the concat edges my video is skipping/glitching.

  ---

  General Workflow

  in general my workflow looks like this

  1. Stream via ffmpeg
  2. capture stream and segment all 2 mins in to TS files
  3. concat TS file to MP4 video
  4. cut MP4 video at the desired Timestamps

  ---

  Detailed Look at Step 4

  as i am handling 2-hours+ videos i don’t want to re-encode the whole video. So i am looking for the closest I Frames to my In and Outpoint and cut 1 Frame before/after. As my result i get 3 Videos (front/middle/back). Now it is only needed to re-encode front and back and concat all three Videos.
  So far the theory

  ---

  General Observations

  As i look at my resulting video, i obeservated the following.
  frontpart duration is e.g. 3.2 secs. i skip framewise through the Video and get nice and clean timestamps ( 00:00:02.620, 00:00:02:660 )
  As soon as i get to my cutting edge the timestamps are skipping some frames and changing (00:00:03.200, 00:00:03.408 ,00:00:03.409). When i look only at the single frame images, their are no missing/dropped frames

  when i concat my TS files, the results contains a messed up frame rate e.g from constant 25 F/s to 25.0096 F/s

  ---

  FFMPEG instructions

  FRONT Video

  ffmpeg -ss 232.52 -i src.mp4 -t 3.24 -filter_complex "setpts=PTS-STARTPTS" -vcodec libx264 -profile:v baseline -level 31 -bf 0  -f mp4 -y front.mp4
  
  ffmpeg version n3.3 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  
    configuration: --prefix=/usr --extra-cflags=-I/usr/include --extra-ldflags=-L/usr/lib --bindir=/usr/local/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-libssh --enable-openssl
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'src.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.33.100
  
    Duration: 01:06:00.33, start: 0.000000, bitrate: 610 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x464 [SAR 1:1 DAR 80:29], 537 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 65 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 (h264) -> setpts (graph 0)
  
    setpts (graph 0) -> Stream #0:0 (libx264)
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x31ea160] using SAR=1/1
  
  [libx264 @ 0x31ea160] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX LZCNT
  
  [libx264 @ 0x31ea160] profile Constrained Baseline, level 3.1
  
  [libx264 @ 0x31ea160] 264 - core 148 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=0 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 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 'front.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1280x464 [SAR 1:1 DAR 80:29], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        encoder         : Lavc57.89.100 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), 44100 Hz, mono, fltp, 69 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
        encoder         : Lavc57.89.100 aac
  
  frame=   81 fps= 31 q=-1.0 Lsize=     151kB time=00:00:03.25 bitrate= 379.5kbits/s speed=1.23x
  
  video:119kB audio:28kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.531915%
  
  [libx264 @ 0x31ea160] frame I:1     Avg QP:17.43  size: 38268
  
  [libx264 @ 0x31ea160] frame P:80    Avg QP:21.05  size:  1038
  
  [libx264 @ 0x31ea160] mb I  I16..4: 71.4%  0.0% 28.6%
  
  [libx264 @ 0x31ea160] mb P  I16..4:  0.2%  0.0%  0.0%  P16..4:  7.8%  1.8%  0.6%  0.0%  0.0%    skip:89.6%
  
  [libx264 @ 0x31ea160] coded y,uvDC,uvAC intra: 21.8% 40.8% 23.1% inter: 1.6% 4.2% 0.2%
  
  [libx264 @ 0x31ea160] i16 v,h,dc,p: 66% 25%  5%  4%
  
  [libx264 @ 0x31ea160] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 28% 15%  4%  4%  5%  4%  5%  4%
  
  [libx264 @ 0x31ea160] i8c dc,h,v,p: 51% 24% 21%  4%
  
  [libx264 @ 0x31ea160] ref P L0: 74.3% 15.2% 10.5%
  
  [libx264 @ 0x31ea160] kb/s:299.56
  
  [aac @ 0x31edfa0] Qavg: 123.323

  MIDDLE Video

  ffmpeg -ss 235.88 -i src.mp4 -c copy -t 1492.96 -f mp4 -y middle.mp4 
  
  ffmpeg version n3.3 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  
    configuration: --prefix=/usr --extra-cflags=-I/usr/include --extra-ldflags=-L/usr/lib --bindir=/usr/local/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-libssh --enable-openssl
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'src.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.33.100
  
    Duration: 01:06:00.33, start: 0.000000, bitrate: 610 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x464 [SAR 1:1 DAR 80:29], 537 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 65 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Output #0, mp4, to 'middle.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
      Stream #0:0(und): Video: h264 (Main) ([33][0][0][0] / 0x0021), yuv420p, 1280x464 [SAR 1:1 DAR 80:29], q=2-31, 537 kb/s, 25 fps, 25 tbr, 90k tbn, 90k tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, mono, fltp, 65 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=37329 fps=16333 q=-1.0 Lsize=  113774kB time=00:24:52.95 bitrate= 624.3kbits/s speed= 653x
  
  video:100359kB audio:12095kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.173957%

  BACK Video

  ffmpeg -ss 1728.88 -i 'src.mp4' -t 3.9199999999998 -filter_complex "setpts=PTS-STARTPTS" -vcodec libx264 -profile:v baseline -level 31 -bf 0  -f mp4 -y back.mp4
  
  ffmpeg version n3.3 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  
    configuration: --prefix=/usr --extra-cflags=-I/usr/include --extra-ldflags=-L/usr/lib --bindir=/usr/local/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-libssh --enable-openssl
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'src.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.33.100
  
    Duration: 01:06:00.33, start: 0.000000, bitrate: 610 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x464 [SAR 1:1 DAR 80:29], 537 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 65 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 (h264) -> setpts (graph 0)
  
    setpts (graph 0) -> Stream #0:0 (libx264)
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x2672160] using SAR=1/1
  
  [libx264 @ 0x2672160] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX LZCNT
  
  [libx264 @ 0x2672160] profile Constrained Baseline, level 3.1
  
  [libx264 @ 0x2672160] 264 - core 148 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=0 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 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 'back.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1280x464 [SAR 1:1 DAR 80:29], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        encoder         : Lavc57.89.100 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), 44100 Hz, mono, fltp, 69 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
        encoder         : Lavc57.89.100 aac
  
  frame=   98 fps= 27 q=-1.0 Lsize=     268kB time=00:00:03.92 bitrate= 559.2kbits/s speed=1.07x
  
  video:230kB audio:33kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.538479%
  
  [libx264 @ 0x2672160] frame I:1     Avg QP:19.57  size:112129
  
  [libx264 @ 0x2672160] frame P:97    Avg QP:21.68  size:  1270
  
  [libx264 @ 0x2672160] mb I  I16..4: 35.4%  0.0% 64.6%
  
  [libx264 @ 0x2672160] mb P  I16..4:  0.2%  0.0%  0.1%  P16..4:  6.9%  2.0%  0.8%  0.0%  0.0%    skip:90.1%
  
  [libx264 @ 0x2672160] coded y,uvDC,uvAC intra: 54.4% 69.1% 54.2% inter: 2.0% 3.6% 0.3%
  
  [libx264 @ 0x2672160] i16 v,h,dc,p: 63% 23%  8%  6%
  
  [libx264 @ 0x2672160] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 17% 11%  6%  8%  9%  7%  8%  8%
  
  [libx264 @ 0x2672160] i8c dc,h,v,p: 50% 18% 24%  7%
  
  [libx264 @ 0x2672160] ref P L0: 81.8% 11.5%  6.7%
  
  [libx264 @ 0x2672160] kb/s:480.15
  
  [aac @ 0x2675fa0] Qavg: 119.994

  CONCAT Videos

  ffmpeg -f concat -safe 0 -i concat.txt -c copy -r 25 -y /concat.mp4 
  
  ffmpeg version n3.3 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  
    configuration: --prefix=/usr --extra-cflags=-I/usr/include --extra-ldflags=-L/usr/lib --bindir=/usr/local/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-libssh --enable-openssl
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  Input #0, concat, from 'concat.txt':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: h264 (Constrained Baseline) ([27][0][0][0] / 0x001B), yuv420p(progressive), 1280x464 [SAR 1:1 DAR 80:29], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1(und): Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, mono, fltp, 74 kb/s
  
  Output #0, mp4, to 'concat.mp4':
  
    Metadata:
  
      encoder         : Lavf57.71.100
  
      Stream #0:0: Video: h264 (Constrained Baseline) ([33][0][0][0] / 0x0021), yuv420p(progressive), 1280x464 [SAR 1:1 DAR 80:29], q=2-31, 25 fps, 25 tbr, 12800 tbn, 25 tbc
  
      Stream #0:1(und): Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, mono, fltp, 74 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=37508 fps=7256 q=-1.0 Lsize=  114285kB time=00:25:00.59 bitrate= 623.9kbits/s speed= 290x
  
  video:100672kB audio:12598kB subtitle:0kB other streams:0kB global headers:1kB muxing overhead: 0.896435%

  ---

  thank you very much.
  If needed i can provide samples

  Manu