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• command for ffmpeg encode h264 baseline profile level 1

  25 décembre 2011, par Morteza M.

  Can anyone suggest a command to encode video to h264 baseline profile ( level 1) ?

  Here is a link for reference : http://blog.mediacoderhq.com/h264-profiles-and-levels/

  I used this command but ffmpeg says it is Main profile not baseline.

  ffmpeg -i <source> -vcodec libx264 -coder 0 -flags +loop+mv4 \
  
  -partitions +parti4x4+parti8x8+parti4x4+partp8x8+partb8x8 -me_method hex -subq 7 \
  
  -trellis 1 -refs 5 -bf 0 -flags2 +mixed_refs -coder 0 -me_range 16 -threads 2 \
  
  -s 240x160 -b:v 64k -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 \
  
  -qmin 10 -qmax 51 -qdiff 4 -strict experimental -acodec aac -ac 1 -ab 48000 \
  
  -f mpegts udp://127.0.0.1:10006?pkt_size=1316
  
  </source>

• Error when initializing webcam with ffmpeg

  29 janvier 2018, par Daniel

  I am trying to set up a webcam and stream to localhost, using ffmpeg.

  Here is a command I put into a terminal :

  ffmpeg -f alsa -ac 2 -i hw:1,0 -f v4l2 -s 1280x720 -r 10 -i /dev/video1 -vcodec libx264 -pix_fmt yuv420p -preset ultrafast -r 25 -g 20 -b:v 2500k -codec:a libmp3lame -ar 44100 -threads 6 -b:a 11025 -bufsize 512k -f flv rtmp://localhost:80/

  And here is what happened :

  ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1 16.04.4) 20160609
  configuration : —prefix=/usr —extra-version=0ubuntu0.16.04.1 —build-suffix=-ffmpeg —toolchain=hardened —libdir=/usr/lib/x86_64-linux-gnu —incdir=/usr/include/x86_64-linux-gnu —cc=cc —cxx=g++ —enable-gpl —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-libcdio —enable-libflite —enable-libfontconfig —enable-libfreetype —enable-libfribidi —enable-libgme —enable-libgsm —enable-libmodplug —enable-libmp3lame —enable-libopenjpeg —enable-libopus —enable-libpulse —enable-librtmp —enable-libschroedinger —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libssh —enable-libtheora —enable-libtwolame —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx265 —enable-libxvid —enable-libzvbi —enable-openal —enable-opengl —enable-x11grab —enable-libdc1394 —enable-libiec61883 —enable-libzmq —enable-frei0r —enable-libx264 —enable-libopencv
  libavutil 54. 31.100 / 54. 31.100
  libavcodec 56. 60.100 / 56. 60.100
  libavformat 56. 40.101 / 56. 40.101
  libavdevice 56. 4.100 / 56. 4.100
  libavfilter 5. 40.101 / 5. 40.101
  libavresample 2. 1. 0 / 2. 1. 0
  libswscale 3. 1.101 / 3. 1.101
  libswresample 1. 2.101 / 1. 2.101
  libpostproc 53. 3.100 / 53. 3.100

  ALSA lib pcm_hw.c:1700 :(_snd_pcm_hw_open) Invalid value for card

  [alsa @ 0x21c45c0] cannot open audio device hw:1,0 (No such file or directory)

  hw:1,0 : Input/output error

• avcodec/aacpsy : Fix AAC Psy PE reduction calculation when multiple iterations are...

  2 mars 2015, par Claudio Freire

  avcodec/aacpsy : Fix AAC Psy PE reduction calculation when multiple iterations are required
  This is a small change, but it does have a big impact on bit allocation.
  all the regressions marked in the report have no audible
  
  difference (I didn’t check them all though), but the improvements can
  
  be heard.
  This affects mostly high bit rates. It’s related to issue #2686.
  In the report, A is the patched version, B is unpatched, all
  
  comparisons show deltas in the form (A-B), so a positive pSNR delta
  
  means a better quality in the patched version, and negative a
  
  regression. Regressions are only considered for pSNR deltas below
  
   1db, they’re considered serious below -6db.
  All measurements were done with tiny_psnr.
  The summary of the report inline for quick reading :
  Files : 58
  
  Bitrates : 6
  
  Tests : 347
  
  Serious Regressions : 0 (0%)
  
  Regressions : 10 (2%)
  
  Improvements : 54 (15%)
  
  Big improvements : 26 (7%)
  
  Worst regression - sine_tester.flac - 384k
  
    - StdDev : 1.68        pSNR : -3.05     maxdiff : -178.00
  
  Best improvement - 07 - Bound.flac - 384k
  
    - StdDev : -1700.05    pSNR : 20.64     maxdiff : -29595.00
  
  Average          - StdDev : -55.67       pSNR : 1.20      maxdiff : -1593.00
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/aacpsy.c
  • [DH] tests/fate/aac.mak