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  • How to Play Smooth 4K Video with FFplay ? [closed]

    14 mai 2020, par Matan Marciano

    Im trying to play 4K video with ffplay and the video is not smooth.

    



    Video File :

    



    



    Hardware :

    



      

    • Dell OptiPlex 7070 Micro (8 Cores, 8GB RAM, GPU : Intel Corporation UHD Graphics 630)

      • 


    • Samsung U28E590D, 4K Screen

      • 


    • DisplayPort to HDMI Cable

      • 


    



    Software :

    



    



    The FFplay command I used is : ffplay -vcodec h264_qsv -i input.ts

    



      

    • Notes :

      • 


    • During the playing, my CPU usage is around 25% (according to 'top' command)

      • 


    • FFplay logs indicate on many frame drops

      • 


    • I also tried VLC and MPV player's- VLC looks bad also. MPV player looks better but still not smooth.

      • 


    



    So, its looks like my hardware is good enough for 4K playing. What am I missing ?
How can I play smooth 4K video via FFplay ?

    


  • FFMPEG throwing error nb_cpb invalid, what went wrong ?

    21 août 2023, par qkhanhpro

    I am trying to play with this file from Kodi sample page https://kodi.wiki/view/Samples

    


    


    HDR10+ Profile A HEVC 10-bit 23.976 Sample (in MKV with DTS:X audio)

    


    


    The ffmpeg command throw this error on every line, with the number always being 93 for multiple different output video codec

    


    nb_cpb 93 invalid.0 q=0.0 size=       0kB time=00:00:00.65 bitrate=   0.5kbits/s speed=3.95x  


    


    A search point to this source file https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/hevc_ps.c

    


    if (!hdr->flags.low_delay_hrd_flag) {
    hdr->cpb_cnt_minus1[i] = get_ue_golomb_long(gb);
    if (hdr->cpb_cnt_minus1[i] > 31) {
        av_log(NULL, AV_LOG_ERROR, "nb_cpb %d invalid\n",
               hdr->cpb_cnt_minus1[i]);
        return AVERROR_INVALIDDATA;
    }
}


    


    What went wrong ?

    


    ffmpeg -i E:\HDR.mkv -c:v libx265 -c:a copy "HDR.mp4" 

ffmpeg -i E:\HDR.mkv -c:v hevc_nvenc -c:a copy "HDR.mp4" 


    


  • rtl_fm piped to ffmpeg for udp stream

    4 novembre 2014, par user3936148

    rtl_fm piped to ffmpeg for udp stream

    Using Windows 7. I would like to pipe the rtl_fm standard out (pipe) to ffmpeg and udp stream it to an ip address. I have downloaded and installed rlt_sdr and other files and I have also installed sox. The console example given with the rtl_fm application using sox to play the radio station is below :

    rtl_fm -f 106500000 -M wbfm -s 200000 -r 48000 -l 0 -E deemp -g 50 - | play -r 48000 -t s16 -L -c 1 -

    This works great, using sox.

    Update :

    Below works with ffplay sounds ok not great..

    rtl_fm -f 106500000 -M wbfm -s 200000 -r 48000 -l 0 -E deemp -g 80- | ffplay -f s16le -ar 48000 -ac 1 -

    I would like to use ffmpeg instead, below is a non working example (just to give you an idea)

    rtl_fm -f 106500000 -M wbfm -s 200000 -r 48000 -l 0 -E deemp -g 50 - | ffmpeg -i - -f s16le -ar 48000 -ac 1 -acodec libmp3lame -ab 24k -ar 22050 -f mpegts udp ://192.168.1.196:1234 -

    useful links :

    http://kmkeen.com/rtl-demod-guide/

    http://sdr.osmocom.org/trac/wiki/rtl-sdr

    Thank you for your help

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