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• 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%

• How to embed subtitles to .mp4 movie using ffmpeg

  25 novembre 2016, par hudac

  I’m trying to embed subtitles I wrote to a movie I created.
  I’m using FFmpeg version : ffmpeg-20150418-git-edbb9b5-win64-static with the command :
  ffmpeg -i in.mp4 -f srt -i subs.srt -c:v copy -c:a copy -c:s mov_text out.mp4 I saw here.

  But I get errors during the process, and when the process is done there’s an output file out.mp4 without subtitles embedded.
  When I play the in.mp4 in some player such as media player classic with the subtitles separately, the subtitles are sync and everything is fine.

  The subtitles are subrip encoded in UTF8.

  I tried to look out for these errors but didn’t find anything useful. it seems something ridiculous.
  What am I doing wrong ?

  Errors such as :

  [mp4 @ 00000000003fe020] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 00000000003fe020] Codec for stream 1 does not use global headers but container format requires global headers
  
  [mp4 @ 00000000003fe020] Application provided duration: -8 / timestamp: 72205 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value

  Movie details from Media info :

  Video  
  
  ID: 1  
  
  Format: AVC  
  
  Format/Info: Advanced Video Codec  
  
  Format profile: Main@L4.2  
  
  Format settings, CABAC: Yes  
  
  Format settings, ReFrames: 3 frames  
  
  Format settings, GOP: M=4, N=24  
  
  Codec ID: avc1  
  
  Codec ID/Info: Advanced Video Coding  
  
  Duration: 8mn 32s  
  
  Source duration: 8mn 32s  
  
  Bit rate: 23.4 Mbps  
  
  Width: 1920 pixels  
  
  Height: 1080 pixels  
  
  Display aspect ratio: 16:9  
  
  Original display aspect ratio: 2.2:1  
  
  Frame rate mode: Variable  
  
  Frame rate: 23.976 fps  
  
  Minimum frame rate: 23.976 fps  
  
  Maximum frame rate: 24.000 fps  
  
  Standard: NTSC  
  
  Color space: YUV  
  
  Chroma subsampling: 4:2:0  
  
  Bit depth: 8 bits  
  
  Scan type: Progressive  
  
  Bits/(Pixel*Frame): 0.472  
  
  Stream size: 1.40 GiB (99%)  
  
  Source stream size: 1.40 GiB (99%)  
  
  Language: English  
  
  Encoded date: UTC 2015-04-28 20:31:41  
  
  Tagged date: UTC 2015-04-28 20:31:41  
  
  mdhd_Duration: 512137  

  Ffmpeg command output :

  ffmpeg version N-71497-gedbb9b5 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
  
  ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
  
  able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
  
   --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --ena
  
  ble-decklink --enable-zlib
  
    libavutil      54. 22.101 / 54. 22.101
  
    libavcodec     56. 34.100 / 56. 34.100
  
    libavformat    56. 30.100 / 56. 30.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 14.100 /  5. 14.100
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'in.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2015-04-28 20:31:41
  
    Duration: 00:08:32.17, start: 0.000000, bitrate: 23640 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv), 1920x1080 [SAR 40:33 DAR 640:297], 23444 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 t
  
  bc (default)
  
      Metadata:
  
        creation_time   : 2015-04-28 20:31:41
  
        handler_name    : ?Mainconcept Video Media Handler
  
        encoder         : AVC Coding
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-04-28 20:31:41
  
        handler_name    : #Mainconcept MP4 Sound Media Handler
  
  Input #1, srt, from 'subs.srt':
  
    Duration: N/A, bitrate: N/A
  
      Stream #1:0: Subtitle: subrip
  
  [mp4 @ 00000000003fe020] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 00000000003fe020] Codec for stream 1 does not use global headers but container format requires global headers
  
  Output #0, mp4, to 'out.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      encoder         : Lavf56.30.100
  
      Stream #0:0(eng): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 40:33 DAR 640:297], q=2-31, 23444 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 24k t
  
  bc (default)
  
      Metadata:
  
        creation_time   : 2015-04-28 20:31:41
  
        handler_name    : ?Mainconcept Video Media Handler
  
        encoder         : AVC Coding
  
      Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, 189 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-04-28 20:31:41
  
        handler_name    : #Mainconcept MP4 Sound Media Handler
  
      Stream #0:2: Subtitle: mov_text ([8][0][0][0] / 0x0008)
  
      Metadata:
  
        encoder         : Lavc56.34.100 mov_text
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
    Stream #1:0 -> #0:2 (subrip (srt) -> mov_text (native))
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 00000000003fe020] Application provided duration: -8 / timestamp: 72205 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -7 / timestamp: 74217 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -8 / timestamp: 76267 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -4 / timestamp: 77872 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -7 / timestamp: 79260 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -1 / timestamp: 88987 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -60 / timestamp: 91489 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -4 / timestamp: 108080 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -1 / timestamp: 112974 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -8 / timestamp: 115528 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -9 / timestamp: 122758 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -6 / timestamp: 124862 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -12 / timestamp: 130307 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -140 / timestamp: 150079 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -144 / timestamp: 156606 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -245 / timestamp: 158916 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -6 / timestamp: 231587 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -1 / timestamp: 234743 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -9 / timestamp: 239406 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -6 / timestamp: 242670 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -4 / timestamp: 249833 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -9 / timestamp: 252669 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -6 / timestamp: 257713 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -2 / timestamp: 272866 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -152 / timestamp: 276417 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -3 / timestamp: 290209 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -6 / timestamp: 302825 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -6 / timestamp: 305466 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -3 / timestamp: 314151 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -8 / timestamp: 315957 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -1 / timestamp: 322568 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -164 / timestamp: 333373 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -3 / timestamp: 379341 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -5 / timestamp: 385070 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -7 / timestamp: 396166 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -7 / timestamp: 402007 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -4 / timestamp: 404571 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -2 / timestamp: 418218 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -5 / timestamp: 428136 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -5 / timestamp: 433347 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -4 / timestamp: 438939 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -7 / timestamp: 445657 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -6 / timestamp: 449039 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -6 / timestamp: 451870 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  [mp4 @ 00000000003fe020] Application provided duration: -5 / timestamp: 456582 is out of range for mov/mp4 format
  
  [mp4 @ 00000000003fe020] pts has no value
  
  frame=12279 fps=138 q=-1.0 Lsize= 1477815kB time=00:08:32.16 bitrate=23637.2kbits/s
  
  video:1465658kB audio:11840kB subtitle:8kB other streams:0kB global headers:0kB muxing overhead: 0.020907%

• Using ffmpeg to combine small mp4 chunks ?

  20 mai 2015, par shiny formica

  I’m trying to convert batches of png images into a single mp4 x264 video using ffmpeg. The conversion, for reasons I won’t go into, converts groups of frames into short mp4 chunks and then I want to take those chunks and merge them into the final video at a specific fps (in this case 30fps).

  My understanding of ffmpeg and the x264 options is too limited, and while I can produce the individual mp4 chunks from the source png frames without trouble, the final merge always ends up duplicating and/or dropping frames especially with very short chunks (< 4 frames).

  The conversion from png to mp4 uses this command :

  ffmpeg -start_number 1001 -framerate 30 -f image2 -i 'intermediate.%d.png' -c:v libx264 -crf 1 -pix_fmt yuv420p -movflags +faststart -frames:v 4 -r 30 chunk.1.mp4 -y

  which appears to work as expected, I get a playable mp4 chunk of, in this case, 4 frames of the sequence of png images at 30fps. The length of each chunk can be anywhere from 1 frame to around 100 frames.

  When all the chunks are generated, I’ve been trying to use the concat demuxer to combine without re-encoding, placing all the source chunk paths in a file :

  concat.txt :

  file 'chunk.1.mp4'
  
  file 'chunk.2.mp4'
  
  file 'chunk.3.mp4'
  
  ...

  and then running this ffmpeg command :

  ffmpeg -f concat -i concat.txt -c:v copy merged.mp4 -y

  but it says this during the concatenation :

  [concat @ 0x315ff80] Estimating duration from bitrate, this may be inaccurate

  and the resulting mp4 has dropped/duplicated frames. So I tried adding duration info to the concat.txt file :

  file 'chunk.1.mp4'
  
  duration 0.133333
  
  file 'chunk.2.mp4'
  
  duration 0.133333
  
  file 'chunk.3.mp4'
  
  duration 0.066666

  in this case, two 4-frame/30fps chunks and one 2-frame/30fps chunk. Which gets rid of that estimation warning, but the result is still duplicating/dropping frames.

  I’m not sure where I’m going wrong here...what do I need to do either in the production of the short mp4 segments, or in the combination stage, to get a single mp4 at the right framerate with no duplicated or dropped frames ?

  As suggested, here’s the console output for the conversion from png->mp4 chunks :

  ffmpeg -loglevel verbose -start_number 1001 -framerate 30 -f image2 -i 'intermediate.%d.png' -c:v libx264 -crf 1 -pix_fmt yuv420p -movflags +faststart -frames:v 4 -r 30 chunk.1.mp4 -y
  
  ffmpeg version 2.5.4 Copyright (c) 2000-2015 the FFmpeg developers
  
    built on Feb 26 2015 10:23:42 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-3)
  
    configuration: --prefix=/dept/srd/vendor/ffmpeg/bundle.rhel6/ffmpeg2.5.4 --enable-static --enable-pthreads --enable-gpl --enable-version3 --disable-ffserver --disable-ffplay --disable-ffprobe --enable-x11grab --enable-nonfree --extra-cflags=-I/dept/srd/vendor/ffmpeg/extern/rhel6/include --extra-ldflags=-L/dept/srd/vendor/ffmpeg/extern/rhel6/lib --enable-libx264 --enable-fontconfig --enable-libfreetype --enable-swscale --enable-libmp3lame --enable-libfaac --disable-yasm
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, image2, from 'intermediate.%d.png':
  
    Duration: 00:00:00.27, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: png, rgba, 1024x1024 (0x0), 30 fps, 30 tbr, 30 tbn, 30 tbc
  
  [graph 0 input from stream 0:0 @ 0x273e9c0] w:1024 h:1024 pixfmt:rgba tb:1/30 fr:30/1 sar:0/1 sws_param:flags=2
  
  [auto-inserted scaler 0 @ 0x2737ea0] w:iw h:ih flags:'0x4' interl:0
  
  [format @ 0x273ece0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed_null_0' and the filter 'format'
  
  [auto-inserted scaler 0 @ 0x2737ea0] w:1024 h:1024 fmt:rgba sar:0/1 -> w:1024 h:1024 fmt:yuv420p sar:0/1 flags:0x4
  
  [libx264 @ 0x273c540] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x273c540] profile High, level 3.2
  
  [libx264 @ 0x273c540] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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=36 lookahead_threads=6 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 'chunk.1.mp4':
  
    Metadata:
  
      encoder         : Lavf56.15.102
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1024x1024, q=-1--1, 30 fps, 15360 tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc56.13.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  No more output streams to write to, finishing.
  
  [mp4 @ 0x273baa0] Starting second pass: moving the moov atom to the beginning of the file
  
  frame=    4 fps=0.0 q=-1.0 Lsize=     197kB time=00:00:00.06 bitrate=24228.7kbits/s    
  
  video:196kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.439751%
  
  Input file #0 (intermediate.%d.png):
  
    Input stream #0:0 (video): 8 packets read (2341016 bytes); 5 frames decoded; 
  
    Total: 8 packets (2341016 bytes) demuxed
  
  Output file #0 (chunk.3.mp4):
  
    Output stream #0:0 (video): 4 frames encoded; 4 packets muxed (201023 bytes); 
  
    Total: 4 packets (201023 bytes) muxed
  
  [libx264 @ 0x273c540] frame I:1     Avg QP: 0.47  size:116049
  
  [libx264 @ 0x273c540] frame P:1     Avg QP: 2.29  size: 37932
  
  [libx264 @ 0x273c540] frame B:2     Avg QP: 2.37  size: 23184
  
  [libx264 @ 0x273c540] consecutive B-frames: 25.0%  0.0% 75.0%  0.0%
  
  [libx264 @ 0x273c540] mb I  I16..4: 80.0%  4.5% 15.5%
  
  [libx264 @ 0x273c540] mb P  I16..4:  0.2%  0.1%  0.4%  P16..4:  8.1%  3.6%  3.7%  0.0%  0.0%    skip:83.9%
  
  [libx264 @ 0x273c540] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  4.8%  1.2%  1.6%  direct: 4.3%  skip:88.1%  L0:38.6% L1:39.3% BI:22.1%
  
  [libx264 @ 0x273c540] 8x8 transform intra:4.6% inter:14.8%
  
  [libx264 @ 0x273c540] coded y,uvDC,uvAC intra: 20.7% 22.9% 22.8% inter: 8.7% 10.1% 10.0%
  
  [libx264 @ 0x273c540] i16 v,h,dc,p: 95%  1%  3%  1%
  
  [libx264 @ 0x273c540] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 21% 22%  6%  6%  6%  7%  5%  6%
  
  [libx264 @ 0x273c540] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 17% 18%  7%  8%  7%  8%  6%  8%
  
  [libx264 @ 0x273c540] i8c dc,h,v,p: 89%  4%  4%  3%
  
  [libx264 @ 0x273c540] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x273c540] ref B L1: 89.5% 10.5%
  
  [libx264 @ 0x273c540] kb/s:12020.88

  as I said, this appears to produce a valid mp4 at 30fps with no duplicated or dropped frames from the input images.

  Here’s the output of the combine phase :

  ffmpeg -loglevel verbose -f concat -i concat.txt -c:v copy merged.mp4 -y
  
  ffmpeg version 2.5.4 Copyright (c) 2000-2015 the FFmpeg developers
  
    built on Feb 26 2015 10:23:42 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-3)
  
    configuration: --prefix=/dept/srd/vendor/ffmpeg/bundle.rhel6/ffmpeg2.5.4 --enable-static --enable-pthreads --enable-gpl --enable-version3 --disable-ffserver --disable-ffplay --disable-ffprobe --enable-x11grab --enable-nonfree --extra-cflags=-I/dept/srd/vendor/ffmpeg/extern/rhel6/include --extra-ldflags=-L/dept/srd/vendor/ffmpeg/extern/rhel6/lib --enable-libx264 --enable-fontconfig --enable-libfreetype --enable-swscale --enable-libmp3lame --enable-libfaac --disable-yasm
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, concat, from 'concat.txt':
  
    Duration: 00:00:00.67, start: 0.000000, bitrate: 2 kb/s
  
      Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1024x1024, 7791 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
  Output #0, mp4, to 'merged.mp4':
  
    Metadata:
  
      encoder         : Lavf56.15.102
  
      Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1024x1024 (0x0), q=2-31, 7791 kb/s, 30 fps, 15360 tbn, 15360 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  No more output streams to write to, finishing.
  
  frame=   20 fps=0.0 q=-1.0 Lsize=     748kB time=00:00:00.56 bitrate=10805.0kbits/s    
  
  video:746kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.141687%
  
  Input file #0 (concat.txt):
  
    Input stream #0:0 (video): 20 packets read (764361 bytes); 
  
    Total: 20 packets (764361 bytes) demuxed
  
  Output file #0 (merged.mp4):
  
    Output stream #0:0 (video): 20 packets muxed (764361 bytes); 
  
    Total: 20 packets (764361 bytes) muxed