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• Cropping video with FFmpeg increases the tbn value too much

  5 avril 2016, par TOP

  Here is the information of original video :

   Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2016-04-05 03:00:09
  
    Duration: 00:01:50.09, start: 0.000000, bitrate: 8131 kb/s
  
      Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, bt470bg/bt470bg/smpte170m), 1920x1080, 7995 kb/s, SAR 1:1 DAR 16:9, 44.49 fps, 90k tbr, 90k tbn, 180k tbc (default)

  Then I used this ffmpeg command to crop video :

  ffmpeg -i file.mp4 -vf "crop=480:480:0:0" -b:v 2048k -preset ultrafast cropped.mp4

  Here is the information of cropped video :

   Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.28.101
  
    Duration: 00:01:50.16, start: 0.023220, bitrate: 1078 kb/s
  
      Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1282x716 [SAR 1:1 DAR 641:358], 1002 kb/s, 44.49 fps, 44.49 tbr, 220455000.00 tbn, 88.98 tbc (default)

  The default video player of my phone cannot play this video. If I use MX Player I have to change the decoder to Software decoder (instead of Hardware) to open it.

  I noticed that the tbn value was increased after reencoding. The old value is 90k. The new value is 220455k. Maybe it is the reason why the default video player doesn’t work.

  Question : why is the tbn value so big ? How to avoid it ?

• why is this intel hardware accellerated transcoding in ffmpeg not working ?

  1er avril 2016, par Jabb

  I compiled ffmpeg with intel hardware accelleration, but I cannot transcode the simpsons 720p video from http://www.h264info.com/clips.html with success.

  this is the error I get :

  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  and this is the full output from ffmpeg. What could be wrong ?

  root@ubuntu:/tmp# ffmpeg -i test.mp4 -vcodec h264_qsv out1.yuv
  
  ffmpeg version N-79177-ga677121 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.1)
  
    configuration: --prefix=/root/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-libmfx
  
    libavutil      55. 19.100 / 55. 19.100
  
    libavcodec     57. 32.100 / 57. 32.100
  
    libavformat    57. 29.101 / 57. 29.101
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 40.102 /  6. 40.102
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 1
  
      compatible_brands: isomavc1
  
      creation_time   : 2007-02-19 05:03:04
  
    Duration: 00:02:17.30, start: 0.000000, bitrate: 4283 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x544, 4221 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
  
      Metadata:
  
        creation_time   : 2007-02-19 05:03:04
  
        handler_name    : GPAC ISO Video Handler
  
      Stream #0:1(und): Audio: aac (HE-AAC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 64 kb/s (default)
  
      Metadata:
  
        creation_time   : 2007-02-19 05:03:08
  
        handler_name    : GPAC ISO Audio Handler
  
  [h264_qsv @ 0x2f626a0] Error initializing an internal MFX session
  
  Output #0, rawvideo, to 'out1.yuv':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 1
  
      compatible_brands: isomavc1
  
      Stream #0:0(und): Video: h264, none, q=2-31, 128 kb/s, 23.98 fps (default)
  
      Metadata:
  
        creation_time   : 2007-02-19 05:03:04
  
        handler_name    : GPAC ISO Video Handler
  
        encoder         : Lavc57.32.100 h264_qsv
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_qsv))
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

• ffmpeg produces video I cannot load on latest Safari on iOS

  3 avril 2016, par Michael Heuberger

  When I encode two videos (mp4 and webm) with these ffmpeg parameters (based on images), I cannot play the mp4 it produces on latest Safari (inside a <video></video> tag) inside my iPhone 6s using the latest iOS too :

  ffmpeg 
  
  -framerate 15.2 
  
  -f image2 
  
  -thread_queue_size 64 
  
  -i /home/michael-heuberger/abcd/frames/%d.webp 
  
  -y 
  
  -an 
  
  -vcodec libx264 
  
  -vf scale=trunc(iw/2)*2:trunc(ih/2)*2 
  
  -crf 16 
  
  -preset fast 
  
  -profile:v baseline 
  
  -pix_fmt yuv420p 
  
  -movflags +faststart 
  
  /home/michael-heuberger/abcd/videomail_good.mp4 
  
  -vcodec libvpx 
  
  -vf scale=trunc(iw/2)*2:trunc(ih/2)*2 
  
  -crf 8 
  
  -deadline good 
  
  -cpu-used 1 
  
  -pix_fmt yuv420p 
  
  -movflags +faststart /home/michael-heuberger/abcd/videomail_good.webm

  I think the above parameters should be solid. I am adding baseline and yuv420p, yet no luck on Safari 9. Why ?

  And here is the whole ffmpeg output (just ignore the paths to the images/videos) :

  ffmpeg stdout: ffmpeg version 2.7.6-0ubuntu0.15.10.1 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.2.1 (Ubuntu 5.2.1-22ubuntu2) 20151010
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.15.10.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-frei0r --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-openal --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libxvid --enable-libzvbi --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-libssh --enable-libsoxr --enable-libx264 --enable-libopencv --enable-libx265
  
    WARNING: library configuration mismatch
  
    avcodec     configuration: --prefix=/usr --extra-version=0ubuntu0.15.10.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-frei0r --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-openal --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libxvid --enable-libzvbi --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-libssh --enable-libsoxr --enable-libx264 --enable-libopencv --enable-libx265 --enable-version3 --disable-doc --disable-programs --disable-avdevice --disable-avfilter --disable-avformat --disable-avresample --disable-postproc --disable-swscale --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libvo_aacenc --enable-libvo_amrwbenc
  
    libavutil      54. 27.100 / 54. 27.100
  
    libavcodec     56. 41.100 / 56. 41.100
  
    libavformat    56. 36.100 / 56. 36.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 16.101 /  5. 16.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.100 /  1.  2.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, image2, from '/home/michael-heuberger/binarykitchen/code/videomail.io/var/local/tmp/clients/videomail.io/11e5-f576-676eaa40-b0ac-89a86db14ea0/frames/%d.webp':
  
    Duration: 00:00:00.59, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: webp, yuv420p(tv, bt470bg/unknown/unknown), 400x300, 15.17 fps, 15.20 tbr, 15.20 tbn, 15.20 tbc
  
  [libx264 @ 0xfc2760] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  [libx264 @ 0xfc2760] profile Constrained Baseline, level 2.1
  
  [libx264 @ 0xfc2760] 264 - core 146 r2555 0c21480 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=0 ref=2 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=6 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=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=15 scenecut=40 intra_refresh=0 rc_lookahead=30 rc=crf mbtree=1 crf=16.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  [libvpx @ 0xfc5da0] v1.4.0
  
  Output #0, mp4, to '/home/michael-heuberger/binarykitchen/code/videomail.io/var/local/uploads/videomail.io/videomail/11e5/f5/76/11e5-f576-676eaa40-b0ac-89a86db14ea0/videomail_good.mp4':
  
    Metadata:
  
      encoder         : Lavf56.36.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 400x300, q=-1--1, 15.20 fps, 19456 tbn, 15.20 tbc
  
      Metadata:
  
        encoder         : Lavc56.41.100 libx264
  
  Output #1, webm, to '/home/michael-heuberger/binarykitchen/code/videomail.io/var/local/uploads/videomail.io/videomail/11e5/f5/76/11e5-f576-676eaa40-b0ac-89a86db14ea0/videomail_good.webm':
  
    Metadata:
  
      encoder         : Lavf56.36.100
  
      Stream #1:0: Video: vp8 (libvpx), yuv420p, 400x300, q=-1--1, 200 kb/s, 15.20 fps, 1k tbn, 15.20 tbc
  
      Metadata:
  
        encoder         : Lavc56.41.100 libvpx
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (webp (native) -> h264 (libx264))
  
    Stream #0:0 -> #1:0 (webp (native) -> vp8 (libvpx))
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 0xfc16c0] Starting second pass: moving the moov atom to the beginning of the file
  
  frame=    9 fps=0.0 q=-1.0 Lq=0.0 size=      62kB time=00:00:00.59 bitrate= 856.1kbits/s    
  
  video:82kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  [libx264 @ 0xfc2760] frame I:1     Avg QP:15.45  size: 10341
  
  [libx264 @ 0xfc2760] frame P:8     Avg QP:15.95  size:  6442
  
  [libx264 @ 0xfc2760] mb I  I16..4: 17.1%  0.0% 82.9%
  
  [libx264 @ 0xfc2760] mb P  I16..4:  6.8%  0.0% 11.3%  P16..4: 36.7% 31.6% 10.8%  0.0%  0.0%    skip: 2.8%
  
  [libx264 @ 0xfc2760] coded y,uvDC,uvAC intra: 67.5% 60.4% 43.0% inter: 60.5% 68.4% 5.4%
  
  [libx264 @ 0xfc2760] i16 v,h,dc,p: 32% 29% 21% 18%
  
  [libx264 @ 0xfc2760] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 32% 23% 20%  3%  4%  6%  5%  4%  3%
  
  [libx264 @ 0xfc2760] i8c dc,h,v,p: 60% 21% 14%  5%
  
  [libx264 @ 0xfc2760] ref P L0: 59.3% 40.7%
  
  [libx264 @ 0xfc2760] kb/s:836.04

  This makes it difficult for me to play videomails recorded on www.videomail.io on iOS devices.

  Am I missing something here ? Already did lots of research and tried various combinations, no luck.

  If you want to reproduce that, easy : just record a video on www.videomail.io and after that, copy the link of the recorded video page to your iPhone or just download it for local investigation.

  Any clues very welcome !