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• Q.For encoding error of ffmpeg

  21 mars 2016, par 社畜根性

  I ran the following command.

  ffmpeg -i test.mp4 -threads 2 -codec:v libx264 -s:v 1280x720 -aspect:v 16:9 -b:v 256k -map 0 -f segment -segment_format mpegts -segment_time 10 -segment_list stream.m3u8 streamfiles/stream%03d.ts

  Execution result

  ffmpeg version N-75926-gce0834b Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.6 (Debian 4.6.3-14+rpi1)
  
    configuration: --arch=armel --target-os=linux --enable-shared --enable-gpl --enable-libx264 --enable-nonfree
  
    libavutil      55.  3.100 / 55.  3.100
  
    libavcodec     57.  5.100 / 57.  5.100
  
    libavformat    57.  3.100 / 57.  3.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 11.100 /  6. 11.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.100 /  2.  0.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.40.100
  
    Duration: 00:00:03.28, start: 0.000000, bitrate: 10159 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 10156 kb/s, 25 fps, 25 tbr, 1200k tbn, 2400k tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Illegal instruction

  The result is that an error occurred.
  Someone told me that it’s an error if you do not put the option to ./configure of libx264. That option is the --extra-cflags='-march=armv6' --extra-ldflags='-march=armv6'. Otherwise it would use the instruction of unsupported.

  So I ran ./configure with the option, then I ran the make and now I’m getting an error message :

  common/arm/quant-a.S: Assembler messages:
  
  common/arm/quant-a.S:362: Error: selected processor does not support ARM mode `rbit r1,r1'
  
  common/arm/quant-a.S:363: Error: selected processor does not support ARM mode `rbit r1,r1'
  
  Makefile:217: recipe for target 'common/arm/quant-a.o' failed
  
  make: *** [common/arm/quant-a.o] Error 1

  I do not know the meaning of this error. How should you deal me this error ?

  I use the machine is Raspberry PI B+ and my OS is Raspbian. I want to use ffmpeg and libx264.

  Any advice and suggestions will be greatly appreciated.

• Using ffmpeg to rotate videos through metadata

  14 octobre 2015, par Gary Dale

  I am using Debian/Stretch AMD64. I have some videos that I need to rotate either 90 or 180 degrees. I’ve read the multiple answers for this that suggest using

  ffmpeg -i input.mp4 -c copy -metadata:s:v:0 rotate=-90 output.mp4
  
  ffprobe -v quiet output.mp4 -show_streams|grep rot

  with the second command verifying the first one worked.

  The problem I’m having is that I can’t get the video to actually rotate properly. Moreover I’m getting different video depending on whether I play with VLC or KMlayer.

  The original video needs to be rotated 90 degrees clockwise. However VLC and KMPlayer play it rotated 90 degrees counterclockwise when I use a rotation of -90. ffprobe shows no match for "rot".

  When I specify a rotation of 90, VLC plays the rotated output like the input while KMPlayer again shows it rotated counterclockwise - the same as for the -90 rotation. This time ffprobe shows TAG:rotate=90 and rotation=-90.

  When I specify a rotation of 270 degrees, again VLC shows no change from the original input while KMPlayer shows the same as the 90 degree rotation.ffprobe shows TAG:rotate=270 and rotation=90

  Finally when I rotate the video -270, I get the same results as 270 except the tags disappear from ffprobe.

  Clearly both VLC and KMPlayer are trying to use the metadata but neither interpreting the same way nor applying it correctly.

  I’m not sure why I’m getting different results from VLC after rotating -90 and 270 when the rot tags are missing in both cases. Nor do I understand why KMPLayer consistently shows the video rotated 90 degrees counterclockwise after any change in the meta information rotation tags.

  Because there are two metatags dealing with rotation (rotate and rotation), I suspect that there is an interaction between them that I need to address with the ffmpeg command line. However I can’t find the information in the man pages.

  Any ideas ?

  Full console output :

      ffmpeg version 2.8-1 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 5.2.1 (Debian 5.2.1-17) 20150911
  
    configuration: --prefix=/usr --extra-version=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 --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-openal --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-opengl --enable-x11grab --enable-libiec61883 --enable-libdc1394 --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
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '20150725_192326.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2015-07-25 23:28:25
  
    Duration: 00:04:56.55, start: 0.000000, bitrate: 17245 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 16999 kb/s, 30.01 fps, 30 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        rotate          : 90
  
        creation_time   : 2015-07-25 23:28:25
  
        handler_name    : VideoHandle
  
      Side data:
  
        displaymatrix: rotation of -90.00 degrees
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-07-25 23:28:25
  
        handler_name    : SoundHandle
  
  File '20150725_192326-rotated.mp4' already exists. Overwrite ? [y/N] y
  
  [mp4 @ 0x1749fc0] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 0x1749fc0] Codec for stream 1 does not use global headers but container format requires global headers
  
  Output #0, mp4, to '20150725_192326-rotated.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      encoder         : Lavf56.40.101
  
      Stream #0:0(eng): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1920x1080, q=2-31, 16999 kb/s, 30.01 fps, 30 tbr, 90k tbn, 90k tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandle
  
        creation_time   : 2015-07-25 23:28:25
  
        rotate          : -90
  
      Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, 256 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-07-25 23:28:25
  
        handler_name    : SoundHandle
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame= 8891 fps=3137 q=-1.0 Lsize=  624465kB time=00:04:56.55 bitrate=17250.0kbits/s    
  
  video:614880kB audio:9267kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.050998%

• Q.For encoding error of ffmpeg

  21 mars 2016, par 社畜根性

  I ran the following command.

  ffmpeg -i test.mp4 -threads 2 -codec:v libx264 -s:v 1280x720 -aspect:v 16:9 -b:v 256k -map 0 -f segment -segment_format mpegts -segment_time 10 -segment_list stream.m3u8 streamfiles/stream%03d.ts

  Execution result

  ffmpeg version N-75926-gce0834b Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.6 (Debian 4.6.3-14+rpi1)
  
    configuration: --arch=armel --target-os=linux --enable-shared --enable-gpl --enable-libx264 --enable-nonfree
  
    libavutil      55.  3.100 / 55.  3.100
  
    libavcodec     57.  5.100 / 57.  5.100
  
    libavformat    57.  3.100 / 57.  3.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 11.100 /  6. 11.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.100 /  2.  0.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.40.100
  
    Duration: 00:00:03.28, start: 0.000000, bitrate: 10159 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 10156 kb/s, 25 fps, 25 tbr, 1200k tbn, 2400k tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Illegal instruction

  The result is that an error occurred.
  Someone told me that it’s an error if you do not put the option to ./configure of libx264. That option is the --extra-cflags='-march=armv6' --extra-ldflags='-march=armv6'. Otherwise it would use the instruction of unsupported.

  So I ran ./configure with the option, then I ran the make and now I’m getting an error message :

  common/arm/quant-a.S: Assembler messages:
  
  common/arm/quant-a.S:362: Error: selected processor does not support ARM mode `rbit r1,r1'
  
  common/arm/quant-a.S:363: Error: selected processor does not support ARM mode `rbit r1,r1'
  
  Makefile:217: recipe for target 'common/arm/quant-a.o' failed
  
  make: *** [common/arm/quant-a.o] Error 1

  I do not know the meaning of this error. How should you deal me this error ?

  I use the machine is Raspberry PI B+ and my OS is Raspbian. I want to use ffmpeg and libx264.

  Any advice and suggestions will be greatly appreciated.