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• How to convert mp4 file so that it can allow timeline drag in html5 video tag ?

  21 août 2019, par sgon00

  I generated a mp4 file by ffmpeg. And then correct the index by qt-faststart. But now, there is still one problem. In chrome browser, the video timeline can not be dragged. I tried another online video with the same video tag code. (for instance : http://www.w3schools.com/html/movie.mp4). The timeline dragging works fine. Can anyone please teach me how to enable timeine drag for this video ? How can I convert the mp4 file to make it right ? Thanks a lot.

  Updated :

  I kinda found the problem and fixed it. My debug http server is picky. So when I use nginx server, the mp4 video timeline can be draggable.

  But the weird part is the timeline of the movie.mp4 from w3schools.com works in my debug http server. So I don’t know the true cause, but changing to production http server solved the problem.

  • ffmpeg command and output :

  $ ffmpeg -i movie.mp4 -vf yadif=1:tff,zscale=w=320:h=240:f=spline36:r=full,unsharp=luma_msize_x=3:luma_msize_y=3:luma_amount=0.8,interlace notworking.mp4
  
  
  
  ffmpeg version N-93939-g819ed1df94-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  
    configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
  
    libavutil      56. 28.100 / 56. 28.100
  
    libavcodec     58. 52.102 / 58. 52.102
  
    libavformat    58. 27.103 / 58. 27.103
  
    libavdevice    58.  7.100 / 58.  7.100
  
    libavfilter     7. 54.101 /  7. 54.101
  
    libswscale      5.  4.101 /  5.  4.101
  
    libswresample   3.  4.100 /  3.  4.100
  
    libpostproc    55.  4.100 / 55.  4.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'movie.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      creation_time   : 2010-05-11T10:32:06.000000Z
  
      encoder         : HandBrake 0.9.4 2009112300
  
    Duration: 00:00:12.61, start: 0.000000, bitrate: 202 kb/s
  
      Chapter #0:0: start 0.000000, end 12.612000
  
      Metadata:
  
        title           :
  
      Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 320x240, 80 kb/s, 29.65 fps, 29.97 tbr, 90k tbn, 59.31 tbc (default)
  
      Metadata:
  
        creation_time   : 2010-05-11T10:32:06.000000Z
  
        encoder         : JVT/AVC Coding
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 115 kb/s (default)
  
      Metadata:
  
        creation_time   : 2010-05-11T10:32:06.000000Z
  
      Stream #0:2(und): Data: bin_data (text / 0x74786574), 0 kb/s
  
      Metadata:
  
        creation_time   : 2010-05-11T10:32:06.000000Z
  
  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
  
  [libx264 @ 0x7faa5400a800] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 0x7faa5400a800] profile Progressive High, level 1.3, 4:2:0, 8-bit
  
  [libx264 @ 0x7faa5400a800] 264 - core 157 r2969 d4099dd - 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=-2 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 'notworking.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      encoder         : Lavf58.27.103
  
      Chapter #0:0: start 0.000000, end 12.612000
  
      Metadata:
  
        title           :
  
      Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 320x240, q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)
  
      Metadata:
  
        creation_time   : 2010-05-11T10:32:06.000000Z
  
        encoder         : Lavc58.52.102 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        creation_time   : 2010-05-11T10:32:06.000000Z
  
        encoder         : Lavc58.52.102 aac
  
  frame=  378 fps=229 q=-1.0 Lsize=     603kB time=00:00:12.60 bitrate= 391.5kbits/s dup=4 drop=0 speed=7.63x
  
  video:388kB audio:199kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.604359%
  
  [libx264 @ 0x7faa5400a800] frame I:2     Avg QP:22.49  size: 11066
  
  [libx264 @ 0x7faa5400a800] frame P:117   Avg QP:24.98  size:  2340
  
  [libx264 @ 0x7faa5400a800] frame B:259   Avg QP:29.82  size:   390
  
  [libx264 @ 0x7faa5400a800] consecutive B-frames:  3.7% 10.1% 14.3% 72.0%
  
  [libx264 @ 0x7faa5400a800] mb I  I16..4:  1.3% 47.0% 51.7%
  
  [libx264 @ 0x7faa5400a800] mb P  I16..4:  0.1%  1.7%  1.2%  P16..4: 49.5% 18.7% 10.5%  0.0%  0.0%    skip:18.3%
  
  [libx264 @ 0x7faa5400a800] mb B  I16..4:  0.0%  0.0%  0.1%  B16..8: 51.6%  5.8%  1.5%  direct: 0.9%  skip:40.1%  L0:52.8% L1:43.7% BI: 3.5%
  
  [libx264 @ 0x7faa5400a800] 8x8 transform intra:51.8% inter:50.8%
  
  [libx264 @ 0x7faa5400a800] coded y,uvDC,uvAC intra: 95.0% 53.2% 17.0% inter: 14.1% 3.7% 0.0%
  
  [libx264 @ 0x7faa5400a800] i16 v,h,dc,p:  8% 75%  2% 15%
  
  [libx264 @ 0x7faa5400a800] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  7% 42% 10%  5%  4%  3% 10%  4% 14%
  
  [libx264 @ 0x7faa5400a800] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  9% 36% 13%  5%  6%  5% 11%  4% 11%
  
  [libx264 @ 0x7faa5400a800] i8c dc,h,v,p: 62% 24%  9%  5%
  
  [libx264 @ 0x7faa5400a800] Weighted P-Frames: Y:0.9% UV:0.9%
  
  [libx264 @ 0x7faa5400a800] ref P L0: 72.8%  9.6% 15.4%  2.2%  0.0%
  
  [libx264 @ 0x7faa5400a800] ref B L0: 92.4%  7.1%  0.5%
  
  [libx264 @ 0x7faa5400a800] ref B L1: 97.7%  2.3%
  
  [libx264 @ 0x7faa5400a800] kb/s:251.81
  
  [aac @ 0x7faa5500b200] Qavg: 826.560

• Why we get co located POCs unavailable while encoding a video using ffmpeg ?

  22 août 2019, par geo-freak

  I am trying to encode a video to m3u8 file. I am inserting blackframes when the video has no source in between. I used the following command to encode the video. I found the options in ffmpeg website to insert the filters and blackframes. But I am failing after making some changes as per stackoverflow and from other sources.

  ffmpeg -threads 8 -i input.ts -loop 1 -framerate 30000/1001 -i /usr/local/etc/tv-test-pattern-146649_1280.png -f lavfi -i anullsrc=channel_layout=5.1:sample_rate=48000 -filter_complex "[0:v]setpts=PTS-STARTPTS[v0]; [0:a]asetpts=PTS-STARTPTS[a0]; [v0]scale=320:240,setsar=1[v0-1]; [1:v]scale=320:240,setsar=1[v1]; [v0-1][a0][v1][2:a]insert=v=1:a=1[v][a]" -map [v] -map [a] -vcodec libx264 -r 30 -fsize 320x240 -b:v 512000 -maxrate 512000 -acodec libfdk_aac -b:a 32000 -ac 2 -ar 48000 -force_key_frames expr:gte'(t,n_forced*3)' -hls_flags single_file -hls_list_size 0 -hls_time 3 -fsize 400x222 -preset:v ultrafast -y output.m3u8
  
  
  
  ffmpeg version n4.1.1-5-gbf14903c01 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
  
    configuration: --prefix=/opt/ffmpeg --extra-version= --toolchain=hardened --libdir=/opt/ffmpeg/lib/x86_64-linux-gnu --incdir=/opt/ffmpeg/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-nonfree --enable-libfdk_aac --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libsnappy --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-libxcb --enable-libxcb-shm --enable-libxcb-shape --enable-libdc1394 --enable-libiec61883 --enable-libx264 --disable-x86asm 
  
    WARNING: library configuration mismatch
  
  
  
  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
  
  
  
  [h264 @ 0x564c2be0f340] sps_id 0 out of range
  
  [h264 @ 0x564c2be0f340] SPS unavailable in decode_picture_timing
  
  [h264 @ 0x564c2be0f340] non-existing PPS 0 referenced
  
  [h264 @ 0x564c2be0f340] sps_id 0 out of range
  
  [h264 @ 0x564c2be0f340] SPS unavailable in decode_picture_timing
  
  [h264 @ 0x564c2be0f340] non-existing PPS 0 referenced
  
  [h264 @ 0x564c2be0f340] decode_slice_header error
  
  [h264 @ 0x564c2be0f340] no frame!
  
  [h264 @ 0x564c2be0f340] sps_id 0 out of range
  
  [h264 @ 0x564c2be0f340] SPS unavailable in decode_picture_timing
  
  [h264 @ 0x564c2be0f340] non-existing PPS 0 referenced
  
  [h264 @ 0x564c2be0f340] sps_id 0 out of range
  
  [h264 @ 0x564c2be0f340] SPS unavailable in decode_picture_timing
  
  [h264 @ 0x564c2be0f340] non-existing PPS 0 referenced
  
  [h264 @ 0x564c2be0f340] decode_slice_header error
  
  [h264 @ 0x564c2be0f340] no frame!
  
  
  
  input.ts FPS 25.000000 0
  
  Input #0, mpegts, from 'input.ts':
  
    Duration: 00:19:51.22, start: 127.107911, bitrate: 1109 kb/s
  
    Program 1 
  
      Stream #0:0[0x105]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0x106]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, fltp, 128 kb/s
  
  Input #1, png_pipe, from '/usr/local/etc/tv-test-pattern-146649_1280.png':
  
    Duration: N/A, bitrate: N/A
  
      Stream #1:0: Video: png, rgba(pc), 1280x960, 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc
  
  Input #2, lavfi, from 'anullsrc=channel_layout=5.1:sample_rate=48000':
  
    Duration: N/A, start: 0.000000, bitrate: 2304 kb/s
  
      Stream #2:0: Audio: pcm_u8, 48000 Hz, 5.1, u8, 2304 kb/s
  
  
  
  [libx264 @ 0x564c2be5ea80] VBV maxrate specified, but no bufsize, ignored
  
  [libx264 @ 0x564c2be5ea80] using SAR=1/1
  
  [libx264 @ 0x564c2be5ea80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  [libx264 @ 0x564c2be5ea80] profile Constrained Baseline, level 2.0
  
  [libx264 @ 0x564c2be5ea80] 264 - core 148 r2748 97eaef2 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 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=0 intra_refresh=0 rc=abr mbtree=0 bitrate=512 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
  
  [hls @ 0x564c2be40e80] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
      Last message repeated 1 times
  
  
  
  Output #0, hls, to output.m3u8':
  
    Metadata:
  
      encoder         : Lavf58.20.100
  
      Stream #0:0: Video: h264 (libx264), yuv420p, 320x240 [SAR 1:1 DAR 4:3], q=-1--1, 512 kb/s, 30 fps, 90k tbn, 30 tbc (default)
  
      Metadata:
  
        encoder         : Lavc58.35.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 512000/0/512000 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: aac (libfdk_aac), 48000 Hz, stereo, s16, 32 kb/s (default)
  
      Metadata:
  
        encoder         : Lavc58.35.100 libfdk_aac
  
  Stream mapping:
  
    Stream #0:0 (h264) -> setpts
  
    Stream #0:1 (ac3) -> asetpts
  
    Stream #1:0 (png) -> scale
  
    Stream #2:0 (pcm_u8) -> insert:in1:a0
  
    insert:out:v0 -> Stream #0:0 (libx264)
  
    insert:out:a0 -> Stream #0:1 (libfdk_aac)
  
  Press [q] to stop, [?] for help
  
  [h264 @ 0x564c2ce43a40] co located POCs unavailable
  
  [h264 @ 0x564c2ce53600] co located POCs unavailable
  
  [h264 @ 0x564c2cef1280] error while decoding MB 43 20, bytestream -5=3 drop=0 speed=0.599x    
  
  [h264 @ 0x564c2cef1280] concealing 5766 DC, 5766 AC, 5766 MV errors in B frame
  
  [h264 @ 0x564c2ce53600] co located POCs unavailable
  
  [h264 @ 0x564c2ce9bac0] co located POCs unavailable
  
  Past duration 1.189308 too largeN/A time=00:00:01.12 bitrate=N/A dup=6 drop=0 speed=0.714x    
  
  Past duration 0.989311 too large
  
  Past duration 0.789314 too large
  
  [hls @ 0x564c2be40e80] Cannot use rename on non file protocol, this may lead to races and temporary partial files
  
  [h264 @ 0x564c2ce43a40] concealing 1184 DC, 1184 AC, 1184 MV errors in I frame speed=0.971x    
  
  [h264 @ 0x564c2cef1280] Reference 3 >= 2=00:00:16.56 bitrate=N/A dup=83 drop=0 speed=0.985x    
  
  [h264 @ 0x564c2cef1280] error while decoding MB 44 32, bytestream 7180
  
  [h264 @ 0x564c2cef1280] concealing 4325 DC, 4325 AC, 4325 MV errors in B frame
  
  [h264 @ 0x564c2cf2a340] co located POCs unavailable
  
  [h264 @ 0x564c2ce43a40] co located POCs unavailable
  
  [mpegts @ 0x564c2be0a680] PES packet size mismatch02 bitrate=N/A dup=100 drop=0 speed=0.975x 
  
  frame=22321 fps=0.4 q=-1.0 Lsize=N/A time=00:12:24.03 bitrate=N/A dup=3720 drop=0 speed=0.0126x    
  
  video:46857kB audio:2907kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  My questions are

  • Why I’m getting "co located POC’s unavailable"
  • sps_id 0 out of range
  • SPS unavailable in decode_picture_timing

• How to output mp4 after concatenation using ffmpeg

  27 août 2019, par Patrick

  I want to merge a couple of mp4 videos (with different fps, heigth, width and bitrate).

  I tried this with a few videos, but it always hides or skips some video files from the input.txt.

  How can I correctly merge those mp4 files ?

  Thank you !

  My command :

  ffmpeg, "-f", "concat", "-i", "concatfile.txt", "-c:v", "copy", "-sn", "-y", "merged_video.mp4", "-max_muxing_queue_size", "1024"

  -> the video does not play correctly

  EDIT :
  i now output the information of each video in concat.txt_

  INPUT1:
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0000028cdd7c3d00] Auto-inserting h264_mp4toannexb bitstream filter
  
  
  
  Input #0, concat, from 'concatfile.txt':
  
  
  
    Duration: N/A, start: 0.000000, bitrate: 535 kb/s
  
  
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 435 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
  
  
  
      Metadata:
  
  
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 05/10/2019.
  
  
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 100 kb/s
  
  
  
      Metadata:
  
  
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 05/10/2019.
  
  
  
  INPUT2:
  
  mov,mp4,m4a,3gp,3g2,mj2 @ 00000256592b3d00] Auto-inserting h264_mp4toannexb bitstream filter
  
  
  
  Input #0, concat, from 'concatfile.txt':
  
  
  
    Duration: N/A, start: 0.000000, bitrate: 620 kb/s
  
  
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 522 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
  
  
  
      Metadata:
  
  
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 10/31/2018.
  
  
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 97 kb/s
  
  
  
      Metadata:
  
  
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 10/31/2018.
  
  
  
  
  
  INPUT3:
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000001a774cd3d00] Auto-inserting h264_mp4toannexb bitstream filter
  
  
  
  Input #0, concat, from 'concatfile.txt':
  
  
  
    Duration: N/A, start: 0.000000, bitrate: 609 kb/s
  
  
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 513 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
  
  
  
      Metadata:
  
  
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 10/31/2018.
  
  
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 96 kb/s
  
  
  
      Metadata:
  
  
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 10/31/2018.
  
  
  
  
  
  INPUT4:
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000165b1013c80] Auto-inserting h264_mp4toannexb bitstream filter
  
  
  
  Input #0, concat, from 'concatfile.txt':
  
  
  
    Duration: N/A, start: 0.000000, bitrate: 510 kb/s
  
  
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 415 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
  
  
  
      Metadata:
  
  
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 10/31/2018.
  
  
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 95 kb/s
  
  
  
      Metadata:
  
  
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 10/31/2018.
  
  
  
  INPUT5:
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000001c545493c80] Auto-inserting h264_mp4toannexb bitstream filter
  
  
  
  Input #0, concat, from 'concatfile.txt':
  
  
  
    Duration: N/A, start: -0.042667, bitrate: 2972 kb/s
  
  
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 900x600 [SAR 1:1 DAR 3:2], 2862 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
  
  
  
      Metadata:
  
  
  
        handler_name    : VideoHandler
  
  
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 24000 Hz, mono, fltp, 110 kb/s
  
  
  
      Metadata:
  
  
  
        handler_name    : SoundHandler

  Could be the issue, that the last mp4 has mono audio ?