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  • The MOS difference after converting MPEG-2 video to MPEG-4 [closed]

    5 mars 2023, par Parsa Shariat

    Using the application I use, I can calculate MOS for mpeg-4 videos, but not for mpeg-2 videos,
If I convert an MPEG-2 file to MPEG-4 and then determine MOS, is it valid ? If not, how far is it from reality ?
Thanks.

    


  • ffmpeg could not find codec parameters for stream 0 on Ubuntu 22.04, works fine on Ubuntu 18.04

    22 février 2023, par ngm

    I'm new to ffmpeg but I've got an odd issue which seems to arise from using it on different Ubuntu versions.

    


    I have an NVIDIA Jetson Nano running Ubuntu 18.04.5 LTS (GNU/Linux 4.9.201-tegra aarch64). Plugged into the Nano's carrier board is an embedded camera that shows up as a Sunplus Innovation Technology Inc. USB2.0 Camera RGB when I run lsusb.

    


    When I run this ffmpeg command, I can successfully record video from the camera, which seems to be mjpeg codec with yuvj422p pixel format. The output is as follows :

    


    ffmpeg -f video4linux2 -i /dev/video0 -an -vcodec libx264 test_capture.mp4
ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu/Linaro 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/aarch64-linux-gnu --incdir=/usr/include/aarch64-linux-gnu --enable-gpl --disable-stripping --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-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --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-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 166.142773, bitrate: N/A
    Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 928x400, 100 fps, 100 tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x558553df70] using cpu capabilities: ARMv8 NEON
[libx264 @ 0x558553df70] profile High 4:2:2, level 3.2, 4:2:2 8-bit
[libx264 @ 0x558553df70] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - 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=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 'test_capture.mp4':
  Metadata:
    encoder         : Lavf57.83.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuvj422p(pc), 928x400, q=-1--1, 100 fps, 12800 tbn, 100 tbc
    Metadata:
      encoder         : Lavc57.107.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame=  192 fps= 65 q=-1.0 Lsize=     151kB time=00:00:01.89 bitrate= 654.4kbits/s dup=150 drop=0 speed=0.642x    
video:148kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.072495%
[libx264 @ 0x558553df70] frame I:1     Avg QP:23.62  size: 36953
[libx264 @ 0x558553df70] frame P:49    Avg QP:25.25  size:  2121
[libx264 @ 0x558553df70] frame B:142   Avg QP:30.55  size:    70
[libx264 @ 0x558553df70] consecutive B-frames:  1.0%  1.0%  0.0% 97.9%
[libx264 @ 0x558553df70] mb I  I16..4: 10.1% 78.8% 11.1%
[libx264 @ 0x558553df70] mb P  I16..4:  1.1%  1.9%  0.0%  P16..4: 19.1%  3.0%  2.0%  0.0%  0.0%    skip:72.8%
[libx264 @ 0x558553df70] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  2.7%  0.0%  0.0%  direct: 0.1%  skip:97.2%  L0:36.8% L1:62.3% BI: 0.9%
[libx264 @ 0x558553df70] 8x8 transform intra:68.4% inter:77.4%
[libx264 @ 0x558553df70] coded y,uvDC,uvAC intra: 42.0% 80.2% 41.3% inter: 2.2% 5.4% 0.2%
[libx264 @ 0x558553df70] i16 v,h,dc,p: 50% 17% 10% 23%
[libx264 @ 0x558553df70] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21%  9% 32%  5%  7%  7%  5%  8%  5%
[libx264 @ 0x558553df70] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 15% 12%  5% 14% 11%  8%  5%  7%
[libx264 @ 0x558553df70] i8c dc,h,v,p: 50% 12% 26% 12%
[libx264 @ 0x558553df70] Weighted P-Frames: Y:28.6% UV:28.6%
[libx264 @ 0x558553df70] ref P L0: 56.4% 28.2% 12.0%  2.5%  0.9%
[libx264 @ 0x558553df70] ref B L0: 93.4%  5.3%  1.3%
[libx264 @ 0x558553df70] ref B L1: 94.9%  5.1%
[libx264 @ 0x558553df70] kb/s:628.21
Exiting normally, received signal 2.


    


    However, I'd like to replace this Nano with another that I've upgraded to Ubuntu 22.04.1 LTS (GNU/Linux 4.9.299-tegra aarch64). The device still shows up as the same type when running lsusb. Running the exact same command results in the following :

    


    ffmpeg -f video4linux2 -i /dev/video0 -an -vcodec libx264 test_capture.mp4
ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
  configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/aarch64-linux-gnu --incdir=/usr/include/aarch64-linux-gnu --arch=arm64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
[video4linux2,v4l2 @ 0x55cab86450] Could not find codec parameters for stream 0 (Video: mjpeg, none(bt470bg/unknown/unknown), 1856x800): unspecified pixel format
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: mjpeg, none(bt470bg/unknown/unknown), 1856x800, 60 fps, 60 tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
Cannot determine format of input stream 0:0 after EOF
Error marking filters as finished
Exiting normally, received signal 2.


    


    I'm not sure why I can't read this video stream when everything seems to be the same but the OS and the ffmpeg version.

    


    I've checked the available codecs and pixel formats using ffmpeg -codecs and ffmpeg -pix_fmts :

    


    Ubuntu 18.04.5, ffmpeg version 3.4.8-0ubuntu0.2 :

    


    DEVIL. mjpeg                Motion JPEG (encoders: mjpeg mjpeg_vaapi )

    


    IO... yuvj422p               3            16

    


    Ubuntu 22.04.1, ffmpeg version 4.4.2-0ubuntu0.22.04.1 :

    


    DEVIL. mjpeg                Motion JPEG (decoders: mjpeg mjpeg_cuvid ) (encoders: mjpeg mjpeg_vaapi )

    


    IO... yuvj422p               3            16

    


    So it seems like I should be able to record video on both with this codec/pixel format combination.

    


    I've also tried forcing ffmpeg to use this combination on the 22.04 Nano with the following command :

    


    ffmpeg -f v4l2 -input_format mjpeg -framerate 100 -video_size 928x400 -pix_fmt yuvj422p -i /dev/video0 -an -vcodec libx264 test_capture.mp4

    


    But I get the same error. I've also tried increasing the -analyzeduration and -probesize arguments to 100M, with no luck.

    


    Are there other commands or settings I should use ? Should I downgrade my ffmpeg version if possible ?

    


  • x86 : replace explicit REP_RETs with RETs

    1er février 2023, par Lynne
    x86 : replace explicit REP_RETs with RETs

    From x86inc :
    
> On AMD cpus <=K10, an ordinary ret is slow if it immediately follows either
    
> a branch or a branch target. So switch to a 2-byte form of ret in that case.
    
> We can automatically detect "follows a branch", but not a branch target.
    
> (SSSE3 is a sufficient condition to know that your cpu doesn't have this problem.)
    

    x86inc can automatically determine whether to use REP_RET rather than
    
REP in most of these cases, so impact is minimal. Additionally, a few
    
REP_RETs were used unnecessary, despite the return being nowhere near a
    
branch.
    

    The only CPUs affected were AMD K10s, made between 2007 and 2011, 16
    
years ago and 12 years ago, respectively.
    

    In the future, everyone involved with x86inc should consider dropping
    
REP_RETs altogether.
    • [DH] libavcodec/x86/aacpsdsp.asm
    • [DH] libavcodec/x86/ac3dsp.asm
    • [DH] libavcodec/x86/alacdsp.asm
    • [DH] libavcodec/x86/audiodsp.asm
    • [DH] libavcodec/x86/dirac_dwt.asm
    • [DH] libavcodec/x86/fft.asm
    • [DH] libavcodec/x86/flacdsp.asm
    • [DH] libavcodec/x86/h264_chromamc.asm
    • [DH] libavcodec/x86/h264_chromamc_10bit.asm
    • [DH] libavcodec/x86/h264_deblock_10bit.asm
    • [DH] libavcodec/x86/h264_idct.asm
    • [DH] libavcodec/x86/h264_idct_10bit.asm
    • [DH] libavcodec/x86/h264_intrapred.asm
    • [DH] libavcodec/x86/h264_intrapred_10bit.asm
    • [DH] libavcodec/x86/h264_qpel_10bit.asm
    • [DH] libavcodec/x86/h264_qpel_8bit.asm
    • [DH] libavcodec/x86/h264_weight.asm
    • [DH] libavcodec/x86/h264_weight_10bit.asm
    • [DH] libavcodec/x86/hevc_sao.asm
    • [DH] libavcodec/x86/hevc_sao_10bit.asm
    • [DH] libavcodec/x86/hpeldsp.asm
    • [DH] libavcodec/x86/hpeldsp_vp3.asm
    • [DH] libavcodec/x86/huffyuvdsp.asm
    • [DH] libavcodec/x86/jpeg2000dsp.asm
    • [DH] libavcodec/x86/lossless_videodsp.asm
    • [DH] libavcodec/x86/lossless_videoencdsp.asm
    • [DH] libavcodec/x86/me_cmp.asm
    • [DH] libavcodec/x86/pngdsp.asm
    • [DH] libavcodec/x86/qpel.asm
    • [DH] libavcodec/x86/qpeldsp.asm
    • [DH] libavcodec/x86/rv34dsp.asm
    • [DH] libavcodec/x86/rv40dsp.asm
    • [DH] libavcodec/x86/sbrdsp.asm
    • [DH] libavcodec/x86/takdsp.asm
    • [DH] libavcodec/x86/utvideodsp.asm
    • [DH] libavcodec/x86/v210.asm
    • [DH] libavcodec/x86/vc1dsp_mc.asm
    • [DH] libavcodec/x86/videodsp.asm
    • [DH] libavcodec/x86/vp8dsp.asm
    • [DH] libavfilter/x86/af_volume.asm
    • [DH] libavfilter/x86/avf_showcqt.asm
    • [DH] libavfilter/x86/scene_sad.asm
    • [DH] libavfilter/x86/vf_blend.asm
    • [DH] libavfilter/x86/vf_framerate.asm
    • [DH] libavfilter/x86/vf_gradfun.asm
    • [DH] libavfilter/x86/vf_hqdn3d.asm
    • [DH] libavfilter/x86/vf_interlace.asm
    • [DH] libavfilter/x86/vf_maskedmerge.asm
    • [DH] libavfilter/x86/vf_stereo3d.asm
    • [DH] libavfilter/x86/vf_w3fdif.asm
    • [DH] libavutil/x86/float_dsp.asm
    • [DH] libavutil/x86/lls.asm
    • [DH] libswresample/x86/audio_convert.asm
    • [DH] libswresample/x86/rematrix.asm
    • [DH] libswscale/x86/input.asm
    • [DH] libswscale/x86/output.asm
    • [DH] libswscale/x86/scale.asm
    • [DH] libswscale/x86/scale_avx2.asm
    • [DH] libswscale/x86/yuv2yuvX.asm
    • [DH] libswscale/x86/yuv_2_rgb.asm
    • [DH] tests/checkasm/x86/checkasm.asm

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