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• Merge 2 video files with thier audio in a single file side by side

  27 mai 2015, par meghana

  I need to merge 2 video files along with their audio in single file side by side.

  I am able to merge 2 video files in single file but it using audio of first video file only, where as I need to merge audio of second file as well.

  below is command I am using to do that.

  ffmpeg.exe -i input1.webm -vf "[in] scale=iw/2:ih/2, pad=2*iw:ih [left]; movie=input2.webm, scale=iw/2:ih/2 [right]; [left][right] overlay=main_w/2:0 [out]" -b:v 768k ouput.webm

  I have tried various way with amerge but no success. As I am new to FFMpeg, I am not sure how can I achieve this.

  EDIT

  Below is FFMpeg Command I have used for merging both files as suggested by @occvtech , still it is not merging audio of second audio

  ffmpeg.exe -i 3.mp4 -i 4.mp4 -filter_complex "[0:v] scale=iw/2:ih/2,pad=2*iw:ih[left];[1:v]scale=iw/2:ih/2[right];[left][right‌​]overlay=main_w/2:0 [out]" -map [out] -map 0:a -map 1:a -b:v 768k o5.mp4

  Below is console output for command

  ffmpeg version N-72276-gf99fed7 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --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 --enab
  
  le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
  
  able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --ena
  
  ble-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
  
   --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl
  
  e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --ena
  
  ble-decklink --enable-zlib
  
    libavutil      54. 23.101 / 54. 23.101
  
    libavcodec     56. 39.101 / 56. 39.101
  
    libavformat    56. 33.101 / 56. 33.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 16.101 /  5. 16.101
  
    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 '3.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.23.106
  
    Duration: 00:00:13.52, start: 0.023220, bitrate: 968 kb/s
  
      Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yu
  
  v420p, 640x480, 889 kb/s, 10 fps, 10 tbr, 10240 tbn, 20 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp,
  
   76 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '4.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.23.106
  
    Duration: 00:00:14.92, start: 0.023220, bitrate: 1049 kb/s
  
      Stream #1:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yu
  
  v420p, 640x480, 971 kb/s, 10 fps, 10 tbr, 10240 tbn, 20 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp,
  
   75 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [libx264 @ 040d20e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 040d20e0] profile High, level 2.1
  
  [libx264 @ 040d20e0] 264 - core 146 r2538 121396c - H.264/MPEG-4 AVC codec - Cop
  
  yleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deb
  
  lock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 m
  
  e_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chro
  
  ma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 i
  
  nterlaced=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=10 scenec
  
  ut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=768 ratetol=1.0 qc
  
  omp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'o5.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.33.101
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x24
  
  0, q=-1--1, 768 kb/s, 10 fps, 10240 tbn, 10 tbc (default)
  
      Metadata:
  
        encoder         : Lavc56.39.101 libx264
  
      Stream #0:1(und): Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 44100
  
  Hz, mono, s16, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
        encoder         : Lavc56.39.101 libvo_aacenc
  
  Stream mapping:
  
    Stream #0:0 (h264) -> scale (graph 0)
  
    Stream #1:0 (h264) -> scale (graph 0)
  
    overlay (graph 0) -> Stream #0:0 (libx264)
  
    Stream #1:1 -> #0:1 (aac (native) -> aac (libvo_aacenc))
  
  Press [q] to stop, [?] for help
  
  frame=   27 fps= 26 q=0.0 size=       0kB time=00:00:03.00 bitrate=   0.1kbits/s
  
  frame=   46 fps= 28 q=0.0 size=       0kB time=00:00:04.90 bitrate=   0.1kbits/s
  
  frame=   80 fps= 37 q=16.0 size=     303kB time=00:00:08.29 bitrate= 298.8kbits/
  
  frame=  117 fps= 43 q=15.0 size=     717kB time=00:00:11.99 bitrate= 489.9kbits/
  
  Past duration 0.767570 too large
  
  frame=  137 fps= 39 q=-1.0 Lsize=    1488kB time=00:00:14.94 bitrate= 815.8kbits
  
  /s dup=0 drop=12
  
  video:1247kB audio:234kB subtitle:0kB other streams:0kB global headers:0kB muxin
  
  g overhead: 0.504372%
  
  [libx264 @ 040d20e0] frame I:1     Avg QP:10.60  size: 30577
  
  [libx264 @ 040d20e0] frame P:36    Avg QP:10.78  size: 20384
  
  [libx264 @ 040d20e0] frame B:100   Avg QP:15.41  size:  5116
  
  [libx264 @ 040d20e0] consecutive B-frames:  0.7%  0.0% 17.5% 81.8%
  
  [libx264 @ 040d20e0] mb I  I16..4: 13.2% 49.8% 37.0%
  
  [libx264 @ 040d20e0] mb P  I16..4:  0.8% 10.7%  1.9%  P16..4: 17.7% 30.4% 29.0%
  
   0.0%  0.0%    skip: 9.6%
  
  [libx264 @ 040d20e0] mb B  I16..4:  0.0%  1.1%  0.0%  B16..8: 27.0% 20.2% 10.1%
  
   direct:15.3%  skip:26.3%  L0:35.6% L1:31.1% BI:33.3%
  
  [libx264 @ 040d20e0] final ratefactor: 13.38
  
  [libx264 @ 040d20e0] 8x8 transform intra:77.9% inter:38.4%
  
  [libx264 @ 040d20e0] coded y,uvDC,uvAC intra: 96.3% 97.8% 97.5% inter: 46.4% 68.
  
  0% 41.1%
  
  [libx264 @ 040d20e0] i16 v,h,dc,p: 44%  4%  7% 44%
  
  [libx264 @ 040d20e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 41% 10% 19%  3%  6%  5%  5%
  
   6%  5%
  
  [libx264 @ 040d20e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 16%  9%  5% 12% 10%  9%
  
   7%  6%
  
  [libx264 @ 040d20e0] i8c dc,h,v,p: 66% 12% 12% 10%
  
  [libx264 @ 040d20e0] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 040d20e0] ref P L0: 46.3% 12.0% 28.7% 13.0%
  
  [libx264 @ 040d20e0] ref B L0: 81.1% 16.0%  2.9%
  
  [libx264 @ 040d20e0] ref B L1: 93.2%  6.8%
  
  [libx264 @ 040d20e0] kb/s:745.10

• ffmpeg how to convert stereo to mono using audio pan filter [migrated]

  5 juin 2015, par John T

  From the documentation, it looks like this should work :

  ffmpeg -i input.mp4 -af "pan=1c|c0=.5*c0+.5*c1" output.mp4

  The output is a video with no sound. When I do ffprobe, it says theres a audio mono track, but its only 2kbps.

  However, when I do it this way though, it seems to work and produce a video with a mono track :

  ffmpeg -i input.mp4 -ac 1 output.mp4

  Does anyone know the reason why the first way isn’t working for me ?

  Thanks !

  Adding Console output

  ffmpeg output :

  ffmpeg -loglevel verbose -i video_tong_hua.mp4 -af "pan=1c|c0=.5*c0+.5*c1" output.mp4
  
  ffmpeg version 2.3.3 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Feb 25 2015 23:01:46 with Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.3.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 48.100 / 55. 48.100
  
    libavdevice    55. 13.102 / 55. 13.102
  
    libavfilter     4. 11.100 /  4. 11.100
  
    libavresample   1.  3.  0 /  1.  3.  0
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, matroska,webm, from 'video_tong_hua.mp4':
  
    Metadata:
  
      encoder         : google
  
    Duration: 00:06:18.38, start: 0.000000, bitrate: 283 kb/s
  
      Stream #0:0: Video: vp8, yuv420p, 322x240, SAR 1:1 DAR 161:120, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc (default)
  
      Stream #0:1: Audio: vorbis, 44100 Hz, stereo, fltp (default)
  
  [graph 0 input from stream 0:0 @ 0x7fc8235003a0] w:322 h:240 pixfmt:yuv420p tb:1/1000 fr:2997/100 sar:1/1 sws_param:flags=2
  
  [graph 1 input from stream 0:1 @ 0x7fc82340d320] tb:1/44100 samplefmt:fltp samplerate:44100 chlayout:0x3
  
  [audio format for output stream 0:1 @ 0x7fc82340d880] auto-inserting filter 'auto-inserted resampler 0' between the filter 'Parsed_pan_0' and the filter 'audio format for output stream 0:1'
  
  [Parsed_pan_0 @ 0x7fc82340da40] o0 = 0.5 i0 + 0.5 i1
  
  [auto-inserted resampler 0 @ 0x7fc82340ce40] ch:1 chl:1 channels fmt:fltp r:44100Hz -> ch:1 chl:mono fmt:s16 r:44100Hz
  
  [libx264 @ 0x7fc823826000] using SAR=1/1
  
  [libx264 @ 0x7fc823826000] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x7fc823826000] profile High, level 1.3
  
  [libx264 @ 0x7fc823826000] 264 - core 142 r2455 021c0dc - 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=12 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 'output.mp4':
  
    Metadata:
  
      encoder         : Lavf55.48.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 322x240 [SAR 1:1 DAR 161:120], q=-1--1, 29.97 fps, 11988 tbn, 29.97 tbc (default)
  
      Metadata:
  
        encoder         : Lavc55.69.100 libx264
  
      Stream #0:1: Audio: aac (libfaac) ([64][0][0][0] / 0x0040), 44100 Hz, mono, s16, 128 kb/s (default)
  
      Metadata:
  
        encoder         : Lavc55.69.100 libfaac
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (vp8 (native) -> h264 (libx264))
  
    Stream #0:1 -> #0:1 (vorbis (native) -> aac (libfaac))
  
  Press [q] to stop, [?] for help
  
  No more output streams to write to, finishing.e=00:06:06.87 bitrate= 132.5kbits/s     
  
  frame=11340 fps=992 q=-1.0 Lsize=    6514kB time=00:06:18.31 bitrate= 141.1kbits/s    
  
  video:5995kB audio:95kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 6.954813%
  
  Input file #0 (video_tong_hua.mp4):
  
    Input stream #0:0 (video): 11970 packets read (8625600 bytes); 11340 frames decoded; 
  
    Input stream #0:1 (audio): 23356 packets read (4543310 bytes); 23355 frames decoded (16675392 samples); 
  
    Total: 35326 packets (13168910 bytes) demuxed
  
  Output file #0 (output.mp4):
  
    Output stream #0:0 (video): 11340 frames encoded; 11340 packets muxed (6139214 bytes); 
  
    Output stream #0:1 (audio): 16285 frames encoded (16675392 samples); 16286 packets muxed (97733 bytes); 
  
    Total: 27626 packets (6236947 bytes) muxed
  
  [libx264 @ 0x7fc823826000] frame I:70    Avg QP:17.29  size:  7924
  
  [libx264 @ 0x7fc823826000] frame P:4501  Avg QP:21.54  size:  1006
  
  [libx264 @ 0x7fc823826000] frame B:6769  Avg QP:21.74  size:   156
  
  [libx264 @ 0x7fc823826000] consecutive B-frames: 16.7%  8.8%  7.4% 67.1%
  
  [libx264 @ 0x7fc823826000] mb I  I16..4: 37.6% 29.0% 33.4%
  
  [libx264 @ 0x7fc823826000] mb P  I16..4:  1.9%  2.5%  0.7%  P16..4: 23.3%  8.0%  4.1%  0.0%  0.0%    skip:59.4%
  
  [libx264 @ 0x7fc823826000] mb B  I16..4:  0.1%  0.1%  0.0%  B16..8: 17.1%  1.2%  0.2%  direct: 0.8%  skip:80.6%  L0:42.2% L1:52.9% BI: 4.8%
  
  [libx264 @ 0x7fc823826000] 8x8 transform intra:44.2% inter:55.4%
  
  [libx264 @ 0x7fc823826000] coded y,uvDC,uvAC intra: 33.9% 47.6% 18.3% inter: 5.4% 4.5% 1.1%
  
  [libx264 @ 0x7fc823826000] i16 v,h,dc,p: 57% 24% 16%  3%
  
  [libx264 @ 0x7fc823826000] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 18% 43%  3%  3%  4%  3%  4%  4%
  
  [libx264 @ 0x7fc823826000] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 30% 14%  4%  6%  6%  6%  5%  5%
  
  [libx264 @ 0x7fc823826000] i8c dc,h,v,p: 51% 30% 17%  3%
  
  [libx264 @ 0x7fc823826000] Weighted P-Frames: Y:1.6% UV:0.5%
  
  [libx264 @ 0x7fc823826000] ref P L0: 66.8% 17.2% 11.7%  4.3%  0.1%
  
  [libx264 @ 0x7fc823826000] ref B L0: 91.0%  7.4%  1.7%
  
  [libx264 @ 0x7fc823826000] ref B L1: 96.0%  4.0%
  
  [libx264 @ 0x7fc823826000] kb/s:129.79

  ffprobe output :

  ffprobe output.mp4 
  
  ffprobe version 2.3.3 Copyright (c) 2007-2014 the FFmpeg developers
  
    built on Feb 25 2015 23:01:46 with Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.3.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 48.100 / 55. 48.100
  
    libavdevice    55. 13.102 / 55. 13.102
  
    libavfilter     4. 11.100 /  4. 11.100
  
    libavresample   1.  3.  0 /  1.  3.  0
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.48.100
  
    Duration: 00:06:18.38, start: 0.010227, bitrate: 141 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 322x240 [SAR 1:1 DAR 161:120], 129 kb/s, 29.97 fps, 29.97 tbr, 11988 tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 2 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  digitaltsai:videos jtsai$ 

• Using libav-tools versus libav built from source - video quality much worse

  17 juin 2015, par kislo

  We are trying to create a video from still images, running on Ubuntu 14.04.

  If we have installed libav-tools then the output video is much higher quality than if we have installed libav manually. Unfortunately, we need to run a solution where libav is built from source, so we want to find out how to improve the quality.

  Here is the console output for the libav-tools (higher quality) :

  avconv version 9.18-6:9.18-0ubuntu0.14.04.1, Copyright (c) 2000-2014 the Libav developers
  
    built on Mar 16 2015 13:19:10 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
  [image2 @ 0x22ae120] max_analyze_duration reached
  
  Input #0, image2, from 'frame.%04d.jpg':
  
    Duration: 00:00:10.00, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: mjpeg, yuvj420p, 1280x720 [PAR 1:1 DAR 16:9], 8 fps, 8 tbr, 8 tbn
  
  [libx264 @ 0x22afac0] using SAR=1/1
  
  [libx264 @ 0x22afac0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
  
  [libx264 @ 0x22afac0] profile High, level 3.1
  
  [libx264 @ 0x22afac0] 264 - core 142 r2389 956c8d8 - 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=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=8 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=1.25 aq=1:1.00
  
  Output #0, mp4, to 'a1.mp4':
  
    Metadata:
  
      encoder         : Lavf54.20.4
  
      Stream #0.0: Video: libx264, yuvj420p, 1280x720 [PAR 1:1 DAR 16:9], q=-1--1, 8 tbn, 8 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg -> libx264)
  
  Press ctrl-c to stop encoding
  
  frame=  159 fps= 43 q=32766.0 Lsize=    1580kB time=19.62 bitrate= 659.3kbits/s    
  
  video:607kB audio:0kB global headers:0kB muxing overhead 160.388953%
  
  [libx264 @ 0x22afac0] frame I:21    Avg QP:14.32  size: 21142
  
  [libx264 @ 0x22afac0] frame P:132   Avg QP:16.12  size:  8691
  
  [libx264 @ 0x22afac0] frame B:6     Avg QP:13.61  size:  3874
  
  [libx264 @ 0x22afac0] consecutive B-frames: 95.0%  0.0%  0.0%  5.0%
  
  [libx264 @ 0x22afac0] mb I  I16..4: 37.4% 61.4%  1.2%
  
  [libx264 @ 0x22afac0] mb P  I16..4:  9.1% 19.2%  0.3%  P16..4:  6.2%  2.8%  1.3%  0.0%  0.0%    skip:61.1%
  
  [libx264 @ 0x22afac0] mb B  I16..4:  1.8%  2.0%  0.0%  B16..8: 31.9%  7.1%  0.7%  direct: 9.2%  skip:47.3%  L0:69.8% L1:29.5% BI: 0.8%
  
  [libx264 @ 0x22afac0] 8x8 transform intra:65.0% inter:92.8%
  
  [libx264 @ 0x22afac0] coded y,uvDC,uvAC intra: 36.3% 31.8% 7.1% inter: 3.6% 6.0% 0.7%
  
  [libx264 @ 0x22afac0] i16 v,h,dc,p: 74% 14%  6%  6%
  
  [libx264 @ 0x22afac0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 24% 32%  5%  2%  3%  2%  1%  3%
  
  [libx264 @ 0x22afac0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 51% 23%  9%  2%  3%  6%  3%  1%  2%
  
  [libx264 @ 0x22afac0] i8c dc,h,v,p: 52% 20% 25%  2%
  
  [libx264 @ 0x22afac0] Weighted P-Frames: Y:6.8% UV:6.1%
  
  [libx264 @ 0x22afac0] ref P L0: 58.1%  6.2% 12.1% 22.6%  0.9%
  
  [libx264 @ 0x22afac0] ref B L0: 83.0% 16.3%  0.7%
  
  [libx264 @ 0x22afac0] ref B L1: 93.5%  6.5%
  
  [libx264 @ 0x22afac0] kb/s:649.85

  Here is the console output for libav built manually (lower quality) :

  avconv version 11.4, Copyright (c) 2000-2014 the Libav developers
  
    built on Jun 17 2015 02:19:28 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
  [image2 @ 0x329f140] max_analyze_duration 5000000 reached
  
  Input #0, image2, from 'frame.%04d.jpg':
  
    Duration: 00:00:10.00, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: mjpeg, yuvj420p, 1280x720 [PAR 1:1 DAR 16:9], 8 fps, 8 tbn
  
  Output #0, mp4, to 'a2.mp4':
  
    Metadata:
  
      encoder         : Lavf56.1.0
  
      Stream #0.0: Video: mpeg4, yuv420p, 1280x720 [PAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 8 fps, 8 tbn, 8 tbc
  
      Metadata:
  
        encoder         : Lavc56.1.0 mpeg4
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> mpeg4 (native))
  
  Press ctrl-c to stop encoding
  
  frame=  159 fps=  0 q=31.0 Lsize=     902kB time=19.75 bitrate= 374.2kbits/s    
  
  video:900kB audio:0kB other streams:0kB global headers:0kB muxing overhead: 0.239928%

  In case it helps : the images are named frame.0000.jpg, frame.0001.jpg, etc., so our command is :
  avconv -y -f image2 -r 8 -i frame.%04d.jpg -vf "setpts=2*PTS" videofile.mp4 for both runs shown above. Any help would be hugely appreciated !