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• Files created with "ffmpeg hevc_nvenc" do not play on TV. (with video codec SDK 9.1 of nvidia)

  29 janvier 2020, par Dashhh

  Problem

  • Files created with hevc_nvenc do not play on TV. (samsung smart tv, model unknown)
    Related to my ffmpeg build is below.

  FFmpeg build conf

  $ ffmpeg -buildconf
  
      --enable-cuda
  
      --enable-cuvid
  
      --enable-nvenc
  
      --enable-nonfree
  
      --enable-libnpp
  
      --extra-cflags=-I/path/cuda/include
  
      --extra-ldflags=-L/path/cuda/lib64
  
      --prefix=/prefix/ffmpeg_build
  
      --pkg-config-flags=--static
  
      --extra-libs='-lpthread -lm'
  
      --extra-cflags=-I/prefix/ffmpeg_build/include
  
      --extra-ldflags=-L/prefix/ffmpeg_build/lib
  
      --enable-gpl
  
      --enable-nonfree
  
      --enable-version3
  
      --disable-stripping
  
      --enable-avisynth
  
      --enable-libass
  
      --enable-libfontconfig
  
      --enable-libfreetype
  
      --enable-libfribidi
  
      --enable-libgme
  
      --enable-libgsm
  
      --enable-librubberband
  
      --enable-libshine
  
      --enable-libsnappy
  
      --enable-libssh
  
      --enable-libtwolame
  
      --enable-libwavpack
  
      --enable-libzvbi
  
      --enable-openal
  
      --enable-sdl2
  
      --enable-libdrm
  
      --enable-frei0r
  
      --enable-ladspa
  
      --enable-libpulse
  
      --enable-libsoxr
  
      --enable-libspeex
  
      --enable-avfilter
  
      --enable-postproc
  
      --enable-pthreads
  
      --enable-libfdk-aac
  
      --enable-libmp3lame
  
      --enable-libopus
  
      --enable-libtheora
  
      --enable-libvorbis
  
      --enable-libvpx
  
      --enable-libx264
  
      --enable-libx265
  
      --disable-ffplay
  
      --enable-libopenjpeg
  
      --enable-libwebp
  
      --enable-libxvid
  
      --enable-libvidstab
  
      --enable-libopenh264
  
      --enable-zlib
  
      --enable-openssl

  ---

  ffmpeg Command

  • Command about FFmpeg encoding

  ffmpeg -ss 1800 -vsync 0 -hwaccel cuvid -hwaccel_device 0 \
  
  -c:v h264_cuvid -i /data/input.mp4 -t 10 \
  
  -filter_complex "\
  
  [0:v]hwdownload,format=nv12,format=yuv420p,\
  
  scale=iw*2:ih*2" -gpu 0 -c:v hevc_nvenc -pix_fmt yuv444p16le -preset slow -rc cbr_hq -b:v 5000k -maxrate 7000k -bufsize 1000k -acodec aac -ac 2 -dts_delta_threshold 1000 -ab 128k -flags global_header ./makevideo_nvenc_hevc.mp4

  Full log about This Command - check this full log

  The reason for adding "-color_ " in the command is as follows.

  • HDR video after creating bt2020 + smpte2084 video using nvidia hardware accelerator. (I’m studying to make HDR videos. I’m not sure if this is right.)

  How can I make a video using ffmpeg hevc_nvenc and have it play on TV ?

  ---

  Things i’ve done

  Here’s what I’ve researched about why it doesn’t work.
   The header information is not properly included in the resulting video file. So I used a program called nvhsp to add SEI and VUI information inside the video. See below for the commands and logs used.

  nvhsp is open source for writing VUI and SEI bitstrings in raw video. nvhsp link

  # make rawvideo for nvhsp
  
  $  ffmpeg -vsync 0 -hwaccel cuvid -hwaccel_device 0 -c:v h264_cuvid \
  
  -i /data/input.mp4 -t 10 \
  
  -filter_complex "[0:v]hwdownload,format=nv12,\
  
  format=yuv420p,scale=iw*2:ih*2" \
  
  -gpu 0 -c:v hevc_nvenc -f rawvideo output_for_nvhsp.265
  
  
  
  # use nvhsp
  
  $ python nvhsp.py ./output_for_nvhsp.265 -colorprim bt2020 \
  
  -transfer smpte-st-2084 -colormatrix bt2020nc \
  
  -maxcll "1000,300" -videoformat ntsc -full_range tv \
  
  -masterdisplay "G (13250,34500) B (7500,3000 ) R (34000,16000) WP (15635,16450) L (10000000,1)" \
  
  ./after_nvhsp_proc_output.265
  
  
  
  Parsing the infile:
  
  
  
  ==========================
  
  
  
  Prepending SEI data
  
  Starting new SEI NALu ...
  
  SEI message with MaxCLL = 1000 and MaxFall = 300 created in SEI NAL
  
  SEI message Mastering Display Data G (13250,34500) B (7500,3000) R (34000,16000) WP (15635,16450) L (10000000,1) created in SEI NAL
  
  Looking for SPS ......... [232, 22703552]
  
  SPS_Nals_addresses [232, 22703552]
  
  SPS NAL Size 488
  
  Starting reading SPS NAL contents
  
  Reading of SPS NAL finished. Read 448 of SPS NALu data.
  
  
  
  Making modified SPS NALu ...
  
  Made modified SPS NALu-OK
  
  New SEI prepended
  
  Writing new stream ...
  
  Progress: 100%
  
  =====================
  
  Done!
  
  
  
  File nvhsp_after_output.mp4 created.
  
  
  
  # after process
  
  $ ffmpeg -y -f rawvideo -r 25 -s 3840x2160 -pix_fmt yuv444p16le -color_primaries bt2020 -color_trc smpte2084  -colorspace bt2020nc -color_range tv -i ./1/after_nvhsp_proc_output.265 -vcodec copy  ./1/result.mp4 -hide_banner
  
  
  
  Truncating packet of size 49766400 to 3260044
  
  [rawvideo @ 0x40a6400] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, rawvideo, from './1/nvhsp_after_output.265':
  
    Duration: N/A, start: 0.000000, bitrate: 9953280 kb/s
  
      Stream #0:0: Video: rawvideo (Y3[0][16] / 0x10003359), yuv444p16le(tv, bt2020nc/bt2020/smpte2084), 3840x2160, 9953280 kb/s, 25 tbr, 25 tbn, 25 tbc
  
  [mp4 @ 0x40b0440] Could not find tag for codec rawvideo in stream #0, codec not currently supported in container
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
      Last message repeated 1 times

  Goal

  • I want to generate matadata normally when encoding a video through hevc_nvenc.

  • I want to create a video through hevc_nvenc and play HDR Video on smart tv with 10bit color depth support.

  ---

  Additional

  • Is it normal for ffmpeg hevc_nvenc not to generate metadata in the resulting video file ? or is it a bug ?

  • Please refer to the image below. (*’알 수 없음’ meaning ’unknown’)

    • if you need more detail file info, check this Gist Link (by ffprobe)
      

  • However, if you encode a file in libx265, the attribute information is entered correctly as shown below.

    • if you need more detail file info, check this Gist Link
      

  However, when using hevc_nvenc, all information is missing.

  • i used option -show_streams -show_programs -show_format -show_data -of json -show_frames -show_log 56 at ffprobe

• Reading subtitle metadata from mpeg files using ffprobe

  26 septembre 2022, par Kaydee Dunlop

  I'm using ffmpeg or to be more specific ffprobe which is part of the ffmpeg toolstack to read subtitle information from a mpeg file. Anyway, I'm facing an issue I currently don't fully understand. If I use the following command :

  


  ffprobe -of json -show_streams -show_format


  


  I get back something like this :

  


      {
        "index": 6,
        "codec_name": "mov_text",
        "codec_long_name": "MOV text",
        "codec_type": "subtitle",
        "codec_tag_string": "tx3g",
        "codec_tag": "0x67337874",
        "width": 3840,
        "height": 240,
        "id": "0x6",
        "r_frame_rate": "0/0",
        "avg_frame_rate": "0/0",
        "time_base": "1/1000",
        "start_pts": 0,
        "start_time": "0.000000",
        "duration_ts": 6706616,
        "duration": "6706.616000",
        "bit_rate": "95",
        "nb_frames": "4028",
        "extradata_size": 48,
        "disposition": {
            "default": 0,
            "dub": 0,
            "original": 0,
            "comment": 0,
            "lyrics": 0,
            "karaoke": 0,
            "forced": 0,
            "hearing_impaired": 0,
            "visual_impaired": 0,
            "clean_effects": 0,
            "attached_pic": 0,
            "timed_thumbnails": 0,
            "captions": 0,
            "descriptions": 0,
            "metadata": 0,
            "dependent": 0,
            "still_image": 0
        },
        "tags": {
            "creation_time": "2022-09-11T01:02:33.000000Z",
            "language": "eng"
        }
    },


  


  you can see, I have several options that can be set for the disposition section, I'm especially interested in "forced" and "hearing_impaired". To set the value for these options I'm trying to use a tool called "Subler" which is a tool to metarise mpeg files and their containing tracks. But for some reason, ffprobe does not seem to match with the fields Subler sets... So I'm kind stuck as I'm never really able to find out if a subtitle track is forced, hearing_impaired (SDH) etc. Is there any kind of workaround for this problem, maybe an extra option I have to set with ffprobe or so ? Is there maybe an alternative tool that can ?

  


  If you are more interested into this issue I also uploaded a test scenario which has forced subtitles, normal subtitles and SDH subtitles properly set, it also contains screenshots and the raw SRT files, which are basically not needed as the subs are already embedded into the mp4 file, but just in case I also attached them.

  


  https://drive.google.com/file/d/1ZZ32i17A33Lhpn4a5BDg033yV9PbZhtS/view?usp=sharing

  


• FFPROBE SWAPS WIDTH AND HEIGHT

  23 septembre 2022, par Chidozie Duru

  I just noticed that ffprobe swaps the width and height of some videos when fetching the data of those videos. Please help suggest how to go about this and get it right or any other package that is confirmed to work. Below is the resulting output after i used ffprobe to request for video metadata. I just requested the width and height, while some are correct, others are not as it swaps the value for width and height.

  


          {
        streams: [
        {
        index: 0,
        codec_name: 'aac',
        codec_long_name: 'AAC (Advanced Audio Coding)',
        profile: 'LC',
        codec_type: 'audio',
        codec_tag_string: 'mp4a',
        codec_tag: '0x6134706d',
        sample_fmt: 'fltp',
        sample_rate: 32000,
        channels: 1,
        channel_layout: 'mono',
        bits_per_sample: 0,
        id: '0x1',
        r_frame_rate: '0/0',
        avg_frame_rate: '0/0',
        time_base: '1/32000',
        start_pts: 0,
        start_time: 0,
        duration_ts: 12228608,
        duration: 382.144,
        bit_rate: 126250,
        max_bit_rate: 'N/A',
        bits_per_raw_sample: 'N/A',
        nb_frames: 11942,
        nb_read_frames: 'N/A',
        nb_read_packets: 'N/A',
        extradata_size: 2,
        tags: [Object],
        disposition: [Object]
        },
        {
        index: 1,
        codec_name: 'h264',
        codec_long_name: 'H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10',
        profile: 'High',
        codec_type: 'video',
        codec_tag_string: 'avc1',
        codec_tag: '0x31637661',
        width: 1920,
        height: 1080,
        coded_width: 1920,
        coded_height: 1080,
        closed_captions: 0,
        film_grain: 0,
        has_b_frames: 0,
        sample_aspect_ratio: 'N/A',
        display_aspect_ratio: 'N/A',
        pix_fmt: 'yuv420p',
        level: 50,
        color_range: 'unknown',
        color_space: 'unknown',
        color_transfer: 'unknown',
        color_primaries: 'unknown',
        chroma_location: 'unspecified',
        field_order: 'progressive',
        refs: 1,
        is_avc: 'true',
        nal_length_size: 4,
        id: '0x2',
        r_frame_rate: '25/1',
        avg_frame_rate: '25/1',
        time_base: '1/30000',
        start_pts: 0,
        start_time: 0,
        duration_ts: 11463600,
        duration: 382.12,
        bit_rate: 183454,
        max_bit_rate: 'N/A',
        bits_per_raw_sample: 8,
        nb_frames: 9553,
        nb_read_frames: 'N/A',
        nb_read_packets: 'N/A',
        extradata_size: 29,
        tags: [Object],
        disposition: [Object]
        }
        ],
        format: {
        filename: './input4.mp4',
        nb_streams: 2,
        nb_programs: 0,
        format_name: 'mov,mp4,m4a,3gp,3g2,mj2',
        format_long_name: 'QuickTime / MOV',
        start_time: 0,
        duration: 382.144,
        size: 14896948,
        bit_rate: 311860,
        probe_score: 100,
        tags: {
        major_brand: 'mp42',
        minor_version: '0',
        compatible_brands: 'isommp42',
        creation_time: '2022-09-23T20:39:00.000000Z'
        }
        },
        chapters: []
        }