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• trying to play corrupted mpeg-ts video using android video view

  20 avril 2015, par asafb

  i am having issue playing partial content of mepg-ts files

  the video files cannot be changed / reformatted / remuxed etc

  server setup :
  contains mpeg-ts video files with h264/acc
  has script that when requested using parameters returns on of the videos "cut"
  according to parameters

  -player :

  (i have no problem playing the full videos "uncut")
  i am trying to play this using android videoview,
  during researching i have found that vlc is the only player able to play the "cut" videos (aka windows mediaplayer, google exoplayer and chrome html5 video player are unable to play)
  running vlc at debug mode revealed error when playing cut video :
  ts error : MPEG-4 descriptor not found
  remuxing the partial content using ffmepg fixes the video

  solutions tried till now :
  1.tried remuxing on the fly using android MediaExtractor and MediaMuxer - but then found out that its not possiable doing that on the fly and anyway that MediaExtractor is unable to open "cut" video
  2.tried getting the first 10K of the full video and then append them to the rest of the "cut" video - the behvior stays the same (vlc able to play while rest wont)

  video files info :

  General
  Count : 278
  Count of stream of this kind : 1
  Kind of stream : General
  Kind of stream : General
  Stream identifier : 0
  ID : 55427
  ID : 55427 (0xD883)
  Count of video streams : 1
  Count of audio streams : 1
  Video_Format_List : AVC
  Video_Format_WithHint_List : AVC
  Codecs Video : AVC
  Audio_Format_List : AAC
  Audio_Format_WithHint_List : AAC
  Audio codecs : AAC LC
  Complete name : 20150416-12.mpg
  File name : 20150416-12
  File extension : mpg
  Format : MPEG-TS
  Format : MPEG-TS
  Format/Extensions usually used : ts m2t m2s m4t m4s ts tp trp
  Commercial name : MPEG-TS
  Internet media type : video/MP2T
  Codec : MPEG-TS
  Codec : MPEG-TS
  Codec/Extensions usually used : ts m2t m2s m4t m4s ts tp trp
  File size : 338329600
  File size : 323 MiB
  File size : 323 MiB
  File size : 323 MiB
  File size : 323 MiB
  File size : 322.7 MiB
  Duration : 27322.311111
  Duration : 27s 322ms
  Duration : 27s 322ms
  Duration : 27s 322ms
  Duration : 00:00:27.322
  Overall bit rate : 1567617
  Overall bit rate : 1 568 Kbps
  Delay : 5542662.322222
  Delay : 1h 32mn
  Delay : 1h 32mn 22s 662ms
  Delay : 1h 32mn
  Delay : 01:32:22.662
  File last modification date : UTC 2015-04-16 09:29:29
  File last modification date (local) : 2015-04-16 12:29:29

  Video
  Count : 205
  Count of stream of this kind : 1
  Kind of stream : Video
  Kind of stream : Video
  Stream identifier : 0
  ID : 68
  ID : 68 (0x44)
  Menu ID : 1
  Menu ID : 1 (0x1)
  Format : AVC
  Format/Info : Advanced Video Codec
  Format/Url : http://developers.videolan.org/x264.html
  Commercial name : AVC
  Format profile : Baseline@L3.0
  Format settings : 3 Ref Frames
  Format settings, CABAC : No
  Format settings, CABAC : No
  Format settings, ReFrames : 3
  Format settings, ReFrames : 3 frames
  Format settings, GOP : M=1, N=25
  Internet media type : video/H264
  Codec ID : 27
  Codec : AVC
  Codec : AVC
  Codec/Family : AVC
  Codec/Info : Advanced Video Codec
  Codec/Url : http://developers.videolan.org/x264.html
  Codec profile : Baseline@L3.0
  Codec settings : 3 Ref Frames
  Codec settings, CABAC : No
  Codec_Settings_RefFrames : 3
  Duration : 4100
  Duration : 4s 100ms
  Duration : 4s 100ms
  Duration : 4s 100ms
  Duration : 00:00:04.100
  Nominal bit rate : 1300000
  Nominal bit rate : 1 300 Kbps
  Width : 704
  Width : 704 pixels
  Height : 576
  Height : 576 pixels
  Pixel aspect ratio : 1.455
  Display aspect ratio : 1.778
  Display aspect ratio : 16:9
  Frame rate : 25.000
  Frame rate : 25.000 fps
  Frame count : 102
  Standard : PAL
  Resolution : 8
  Resolution : 8 bits
  Colorimetry : 4:2:0
  Color space : YUV
  Chroma subsampling : 4:2:0
  Bit depth : 8
  Bit depth : 8 bits
  Scan type : Progressive
  Scan type : Progressive
  Interlacement : PPF
  Interlacement : Progressive
  Bits/(Pixel*Frame) : 0.128
  Writing library : x264 - core 115
  Writing library : x264 core 115
  Writing library/Name : x264
  Writing library/Version : core 115
  Encoding settings : cabac=0 / ref=3 / deblock=1:0:0 / analyse=0x1:0x11 / me=dia / subme=1 / 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=0 / threads=12 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=0 / keyint=25 / keyint_min=2 / scenecut=40 / intra_refresh=0 / rc_lookahead=5 / rc=cbr / mbtree=1 / bitrate=1300 / ratetol=10.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / vbv_maxrate=1300 / vbv_bufsize=2000 / nal_hrd=none / ip_ratio=1.40 / aq=1:1.00

  Audio
  Count : 173
  Count of stream of this kind : 1
  Kind of stream : Audio
  Kind of stream : Audio
  Stream identifier : 0
  ID : 69
  ID : 69 (0x45)
  Menu ID : 1
  Menu ID : 1 (0x1)
  Format : AAC
  Format/Info : Advanced Audio Codec
  Commercial name : AAC
  Format version : Version 4
  Format profile : LC
  Muxing mode : ADTS
  Codec ID : 15
  Codec : AAC LC
  Codec : AAC LC
  Duration : 27322
  Duration : 27s 322ms
  Duration : 27s 322ms
  Duration : 27s 322ms
  Duration : 00:00:27.322
  Bit rate mode : VBR / VBR
  Bit rate mode : Variable / Variable
  Minimum bit rate : 99375
  Minimum bit rate : 99.4 Kbps
  Maximum bit rate : 159750
  Maximum bit rate : 160 Kbps
  Channel(s) : 2
  Channel(s) : 2 channels
  Channel positions : Front : L R
  Channel positions : 2/0/0
  Sampling rate : 48000
  Sampling rate : 48.0 KHz
  Samples count : 1311456
  Compression mode : Lossy
  Compression mode : Lossy

  i prefer finding solution without the need of NDK

  anyone has an idea how to tackle this issue ?
  Thanks

• parser not found for codec wmav2

  5 décembre 2011, par HashCoder

  I am getting a warning when I run the below command.

  Warning : [asf @ 01C787A0] parser not found for codec wmav2, packets or times may be inval
  id.

  I am using the latest ffmpeg.exe, did I miss any parameters. Any suggestions please.

  ffmpeg -i Assets\Logitech_webcam_on_PC.wmv -sameq -f swf -y -an -s 640x360 MySlide.swf
  
  ffmpeg version N-35295-gb55dd10, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Nov 30 2011 00:52:52 with gcc 4.6.2
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-ru
  
  ntime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libope
  
  ncore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --en
  
  able-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger -
  
  -enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwben
  
  c --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-
  
  libxvid --enable-zlib
  
    libavutil    51. 29. 1 / 51. 29. 1
  
    libavcodec   53. 39. 1 / 53. 39. 1
  
    libavformat  53. 22. 0 / 53. 22. 0
  
    libavdevice  53.  4. 0 / 53.  4. 0
  
    libavfilter   2. 50. 0 /  2. 50. 0
  
    libswscale    2.  1. 0 /  2.  1. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  [asf @ 01C787A0] parser not found for codec wmav2, packets or times may be inval
  
  id.
  
  
  
  Seems stream 1 codec frame rate differs from container frame rate: 1000.00 (1000
  
  /1) -> 0.08 (1/12)
  
  Input #0, asf, from 'Assets\Logitech_webcam_on_PC.wmv':
  
    Metadata:
  
      WMFSDKVersion   : 11.0.5721.5265
  
      WMFSDKNeeded    : 0.0.0.0000
  
      IsVBR           : 1
  
      VBR Peak        : 50500.0000
  
      Buffer Average  : 66550.0000
  
    Duration: 00:00:36.22, start: 0.000000, bitrate: 497 kb/s
  
      Stream #0:0(eng): Audio: wmav2 (a[1][0][0] / 0x0161), 32000 Hz, 1 channels,
  
  s16, 20 kb/s
  
      Stream #0:1(eng): Video: wmv2 (WMV2 / 0x32564D57), yuv420p, 320x180, 422 kb/
  
  s, 0.08 tbr, 1k tbn, 1k tbc
  
  [buffer @ 02AA9760] w:320 h:180 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:
  
  [scale @ 02AA9A80] w:320 h:180 fmt:yuv420p -> w:640 h:360 fmt:yuv420p flags:0x4
  
  Output #0, swf, to 'MySlide.swf':
  
    Metadata:
  
      WMFSDKVersion   : 11.0.5721.5265
  
      WMFSDKNeeded    : 0.0.0.0000
  
      IsVBR           : 1
  
      VBR Peak        : 50500.0000
  
      Buffer Average  : 66550.0000
  
      encoder         : Lavf53.22.0
  
      Stream #0:0(eng): Video: flv1, yuv420p, 640x360, q=2-31, 200 kb/s, 90k tbn,
  
  0.08 tbc
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (wmv2 -> flv)
  
  Press [q] to stop, [?] for help
  
  frame=    4 fps=  0 q=0.0 size=      97kB time=00:00:48.00 bitrate=  16.6kbits/s
  
  frame=    5 fps=  0 q=0.0 Lsize=     111kB time=00:01:00.00 bitrate=  15.2kbits/
  
  s dup=0 drop=599
  
  video:111kB audio:0kB global headers:0kB muxing overhead 0.128646%

• Non-monotonous DTS in output for audio stream using ffmpeg concat

  24 mai 2015, par Apollo Marquis

  This was asked in FFMPEG - Non-Monotonous DTS on concat. But the poster simply opted for MP4Box after getting no reply. However, I would like to stick with ffmpeg which I think is quicker.

  I am concatenating files from a text file list of mp4 files that have been encoded at the same time using the same codecs so there should be no incompatibility between the files.

  I am not even sure what Non-monotonous DTS is (anyone ?) but I am worried it may produce some glitches in the concatenated files. They seem ok but there is some evidence of artefacts in the sound. Can I tweak my command line to get rid of this error, and will it speed up the concatenation process ?
  I am using Python subprocess call and the file passed into this function is the list of files. The function decorator is just a timer function for profiling.
  I have tried this with my system ffmpeg not just the static build, and it has the same problem.

  @fn_timer
  
  def concat(file):
  
      proc = call(['/opt/jane_ng/jane_nodejs/ffmpeg-git-20150308-64bit-static/ffmpeg', '-f', 'concat', '-i', file, '-c', 'copy', '-y', 'testConcat.mp4'])

  When I run this, I get the following output :

  ffmpeg version N-45007-g9d7e42e-   http://johnvansickle.com/ffmpeg/    Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (Debian 4.9.2-10)
  
    configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --enable-libass --enable-gnutls --enable-libvidstab --cc=gcc-4.9
  
    libavutil      54. 20.100 / 54. 20.100
  
    libavcodec     56. 26.100 / 56. 26.100
  
    libavformat    56. 25.101 / 56. 25.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 12.100 /  5. 12.100
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  [concat @ 0x31bdd80] Could not find codec parameters for stream 2 (Unknown: none): unknown codec
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, concat, from '/opt/combinatoria/generator/concatFiles/concat.txt':
  
    Duration: N/A, start: 0.000000, bitrate: 1625 kb/s
  
      Stream #0:0: Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv), 960x540 [SAR 1:1 DAR 16:9], 1561 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1: Audio: aac (HE-AAC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 64 kb/s
  
      Stream #0:2: Unknown: none
  
  Output #0, mp4, to 'testConcat.mp4':
  
    Metadata:
  
      encoder         : Lavf56.25.101
  
      Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 960x540 [SAR 1:1 DAR 16:9], q=2-31, 1561 kb/s, 25 fps, 25 tbr, 90k tbn, 90k tbc
  
      Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, 64 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 253952, current: 250488; changing to 253953. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 253953, current: 252536; changing to 253954. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 754296, current: 751464; changing to 754297. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 754297, current: 753512; changing to 754298. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 974696, current: 971964; changing to 974697. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 974697, current: 974012; changing to 974698. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 1340604, current: 1337112; changing to 1340605. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 1340605, current: 1339160; changing to 1340606. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 1746712, current: 1742832; changing to 1746713. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 1746713, current: 1744880; changing to 1746714. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 2119664, current: 2116800; changing to 2119665. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 2119665, current: 2118848; changing to 2119666. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 2274496, current: 2272032; changing to 2274497. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 2274497, current: 2274080; changing to 2274498. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 2685728, current: 2683044; changing to 2685729. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 2685729, current: 2685092; changing to 2685730. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 2850980, current: 2847096; changing to 2850981. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 2850981, current: 2849144; changing to 2850982. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 3033464, current: 3030552; changing to 3033465. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 3033465, current: 3032600; changing to 3033466. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 3384856, current: 3381588; changing to 3384857. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 3384857, current: 3383636; changing to 3384858. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 3760468, current: 3757320; changing to 3760469. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 3760469, current: 3759368; changing to 3760470. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 3990792, current: 3988404; changing to 3990793. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 3990793, current: 3990452; changing to 3990794. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 4295604, current: 4291812; changing to 4295605. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 4295605, current: 4293860; changing to 4295606. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 4750564, current: 4746924; changing to 4750565. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 4750565, current: 4748972; changing to 4750566. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 5025452, current: 5022108; changing to 5025453. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 5025453, current: 5024156; changing to 5025454. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 5271964, current: 5269068; changing to 5271965. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 5271965, current: 5271116; changing to 5271966. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 5707340, current: 5704776; changing to 5707341. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 5707341, current: 5706824; changing to 5707342. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 6003784, current: 6001128; changing to 6003785. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 6003785, current: 6003176; changing to 6003786. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 6371816, current: 6368040; changing to 6371817. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 6371817, current: 6370088; changing to 6371818. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 6875944, current: 6872544; changing to 6875945. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 6875945, current: 6874592; changing to 6875946. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 7042528, current: 7040124; changing to 7042529. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 7042529, current: 7042172; changing to 7042530. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 7314556, current: 7311780; changing to 7314557. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 7314557, current: 7313828; changing to 7314558. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 7541156, current: 7537572; changing to 7541157. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 7541157, current: 7539620; changing to 7541158. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 7795620, current: 7791588; changing to 7795621. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 7795621, current: 7793636; changing to 7795622. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 8063972, current: 8059716; changing to 8063973. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 8063973, current: 8061764; changing to 8063974. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 8063974, current: 8063812; changing to 8063975. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 8350532, current: 8347248; changing to 8350533. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 8350533, current: 8349296; changing to 8350534. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 8656496, current: 8652420; changing to 8656497. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 8656497, current: 8654468; changing to 8656498. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 8902276, current: 8899380; changing to 8902277. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 8902277, current: 8901428; changing to 8902278. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 9159476, current: 9156924; changing to 9159477. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 9159477, current: 9158972; changing to 9159478. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 9468220, current: 9465624; changing to 9468221. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 9468221, current: 9467672; changing to 9468222. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 9748248, current: 9744336; changing to 9748249. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x3255080] Non-monotonous DTS in output stream 0:1; previous: 9748249, current: 9746384; changing to 9748250. This may result in incorrect timestamps in the output file.
  
  frame= 5637 fps=0.0 q=-1.0 Lsize=   45617kB time=00:03:45.60 bitrate=1656.4kbits/s    
  
  video:43701kB audio:1792kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.272048%
  
  Total time running concat: 0.451297044754 seconds

  This process is absolutely key to my current project so any help or clarification would be really appreciated.