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• ffmpeg-python Unable to open .srt, .vtt files. Error initializing filter 'subtitles' with args ... Error initializing complex filters

  3 novembre 2022, par Batuhan Yılmaz

  I'm trying to build a web app where users can upload a video file and a transcript as .srt or .vtt file to get a video with subtitles. But keep getting an error with the subtitles.
  
Here's my code :

  


  import streamlit as st
from streamlit_lottie import st_lottie
from utils import write_vtt, write_srt
import ffmpeg
import requests
from typing import Iterator
from io import StringIO
import numpy as np
import pathlib
import os
import components.authenticate as authenticate


st.set_page_config(page_title="Auto Subtitled Video Generator", page_icon=":movie_camera:", layout="wide")

# Define a function that we can use to load lottie files from a link.
@st.cache(allow_output_mutation=True)
def load_lottieurl(url: str):
    r = requests.get(url)
    if r.status_code != 200:
        return None
    return r.json()


APP_DIR = pathlib.Path(__file__).parent.absolute()

LOCAL_DIR = APP_DIR / "local_transcript"
LOCAL_DIR.mkdir(exist_ok=True)
save_dir = LOCAL_DIR / "output"
save_dir.mkdir(exist_ok=True)


col1, col2 = st.columns([1, 3])
with col1:
    lottie = load_lottieurl("https://assets1.lottiefiles.com/packages/lf20_HjK9Ol.json")
    st_lottie(lottie)

with col2:
    st.write("""
    ## Auto Subtitled Video Generator 
    ##### Upload a video file and a transcript as .srt file and get a video with subtitles.""")


def getSubs(segments: Iterator[dict], format: str, maxLineWidth: int) -> str:
    segmentStream = StringIO()

    if format == 'vtt':
        write_vtt(segments, file=segmentStream, maxLineWidth=maxLineWidth)
    elif format == 'srt':
        write_srt(segments, file=segmentStream, maxLineWidth=maxLineWidth)
    else:
        raise Exception("Unknown format " + format)

    segmentStream.seek(0)
    return segmentStream.read()


def generate_subtitled_video(uploaded_file):
    with open(f"{save_dir}/input.mp4", "wb") as f:
            f.write(uploaded_file.read())
    audio = ffmpeg.input(f"{save_dir}/input.mp4")
    audio = ffmpeg.output(audio, f"{save_dir}/output.wav", acodec="pcm_s16le", ac=1, ar="16k")
    ffmpeg.run(audio, overwrite_output=True)


def main():
    video_file = st.file_uploader("File", type=["mp4", "avi", "mov", "mkv"])
    # get the name of the input_file
    if video_file is not None:
        filename = video_file.name[:-4]
    else:
        filename = None
    transcript_file = st.file_uploader("Transcript", type=["srt", "vtt"])
    if transcript_file is not None:
        transcript_name = transcript_file.name
    else:
        transcript_name = None
    if video_file is not None and transcript_file is not None:
        if transcript_name[-3:] == "vtt":
            with open(f"{save_dir}/transcript.vtt", "wb") as f:
                f.writelines(transcript_file)
                f.close()
            with open(os.path.join(os.getcwd(), f"{save_dir}/transcript.vtt"), "rb") as f:
                vtt_file = f.read()
            if st.button("Generate Video with Subtitles"):
                generate_subtitled_video(video_file)
                video_file = ffmpeg.input(f"{save_dir}/input.mp4")
                audio_file = ffmpeg.input(f"{save_dir}/output.wav")
                ffmpeg.concat(video_file.filter("subtitles", vtt_file), audio_file, v=1, a=1).output("final.mp4").global_args('-report').run(quiet=True, overwrite_output=True)
                video_with_subs = open("final.mp4", "rb")
                col3, col4 = st.columns([3, 1])
                with col3:
                    st.video(video_with_subs)
                with col4:
                    st.download_button(label="Download Video with Subtitles",
                                        data=video_with_subs,
                                        file_name=f"{filename}_with_subs.mp4")
            else:
                st.error("Please upload a video file and a transcript file.")
        elif transcript_name[-3:] == "srt":
            with open(f"{save_dir}/transcript.srt", "wb") as f:
                f.writelines(transcript_file)
                f.close()
            with open(os.path.join(os.getcwd(), f"{save_dir}/transcript.srt"), "rb") as f:
                srt_file = f.read()
                f.close()
            if st.button("Generate Video with Subtitles"):
                generate_subtitled_video(video_file)
                video_file = ffmpeg.input(f"{save_dir}/input.mp4")
                audio_file = ffmpeg.input(f"{save_dir}/output.wav")
                ffmpeg.concat(video_file.filter("subtitles", f'{save_dir}/transcript.srt'), audio_file, v=1, a=1).output("final.mp4").global_args('-report').run(quiet=True, overwrite_output=True)
                video_with_subs = open("final.mp4", "rb")

                col3, col4 = st.columns([3, 1])
                with col3:
                    st.video(video_with_subs)
                with col4:
                    st.download_button(label="Download Video with Subtitles",
                                        data=video_with_subs,
                                        file_name=f"{filename}_with_subs.mp4")
        else:
            st.error("Please upload a .srt or .vtt file")
    else:
        st.info("Please upload a video file and a transcript file")


if __name__ == "__main__":
    authenticate.set_st_state_vars()
    if st.session_state["authenticated"]:
        main()
        authenticate.button_logout()
    else:
        st.info("Please log in or sign up to use the app.")
        authenticate.button_login()
        



  


  I couldn't figure out what I'm doing wrong. Please help

  


  And the log file of ffmpeg error :

  


  ffmpeg started on 2022-11-03 at 21:29:27
Report written to "ffmpeg-20221103-212927.log"
Log level: 48
Command line:
ffmpeg -i "C:\\Users\\batuh\\Auto-Subtitled-Video-Generator - Copy2\\pages\\local_transcript\\output/input.mp4" -i "C:\\Users\\batuh\\Auto-Subtitled-Video-Generator - Copy2\\pages\\local_transcript\\output/output.wav" -filter_complex "[0]subtitles=C\\\\\\\\\\\\:\\\\\\\\\\\\\\\\Users\\\\\\\\\\\\\\\\batuh\\\\\\\\\\\\\\\\Auto-Subtitled-Video-Generator - Copy2\\\\\\\\\\\\\\\\pages\\\\\\\\\\\\\\\\local_transcript\\\\\\\\\\\\\\\\output/transcript.srt[s0];[s0][1]concat=a=1:n=1:v=1[s1]" -map "[s1]" final.mp4 -report -y
ffmpeg version 2022-10-24-git-d79c240196-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 12.1.0 (Rev2, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --ena  libavutil      57. 39.101 / 57. 39.101
  libavcodec     59. 51.100 / 59. 51.100
  libavformat    59. 34.101 / 59. 34.101
  libavdevice    59.  8.101 / 59.  8.101
  libavfilter     8. 49.101 /  8. 49.101
  libswscale      6.  8.112 /  6.  8.112
  libswresample   4.  9.100 /  4.  9.100
  libpostproc    56.  7.100 / 56.  7.100
Splitting the commandline.
Reading option '-i' ... matched as input url with argument 'C:\Users\batuh\Auto-Subtitled-Video-Generator - Copy2\pages\local_transcript\output/input.mp4'.
Reading option '-i' ... matched as input url with argument 'C:\Users\batuh\Auto-Subtitled-Video-Generator - Copy2\pages\local_transcript\output/output.wav'.
Reading option '-filter_complex' ... matched as option 'filter_complex' (create a complex filtergraph) with argument '[0]subtitles=C\\\\\\:\\\\\\\\Users\\\\\\\\batuh\\\\\\\\Auto-Subtitled-Video-Generator - Copy2\\\\\\\\pages\\\\\\\\local_transcript\\\\\\\\output/transcript.srt[s0];[s0][1]concat=a=1:n=1:v=1[s1]'.
Reading option '-map' ... matched as option 'map' (set input stream mapping) with argument '[s1]'.
Reading option 'final.mp4' ... matched as output url.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option filter_complex (create a complex filtergraph) with argument [0]subtitles=C\\\\\\:\\\\\\\\Users\\\\\\\\batuh\\\\\\\\Auto-Subtitled-Video-Generator - Copy2\\\\\\\\pages\\\\\\\\local_transcript\\\\\\\\output/transcript.srt[s0];[s0][1]concat=a=1:n=1:v=1[s1].
Applying option report (generate a report) with argument 1.
Applying option y (overwrite output files) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input url C:\Users\batuh\Auto-Subtitled-Video-Generator - Copy2\pages\local_transcript\output/input.mp4.
Successfully parsed a group of options.
Opening an input file: C:\Users\batuh\Auto-Subtitled-Video-Generator - Copy2\pages\local_transcript\output/input.mp4.
[NULL @ 000001baaeb55300] Opening 'C:\Users\batuh\Auto-Subtitled-Video-Generator - Copy2\pages\local_transcript\output/input.mp4' for reading
[file @ 000001baaeb55800] Setting default whitelist 'file,crypto,data'
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001baaeb55300] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001baaeb55300] ISO: File Type Major Brand: mp42
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001baaeb55300] Unknown dref type 0x206c7275 size 12
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001baaeb55300] Processing st: 0, edit list 0 - media time: 3003, duration: 8201160
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001baaeb55300] Offset DTS by 3003 to make first pts zero.
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001baaeb55300] Setting codecpar->delay to 1 for stream st: 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001baaeb55300] Unknown dref type 0x206c7275 size 12
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001baaeb55300] Before avformat_find_stream_info() pos: 34044 bytes read:65536 seeks:0 nb_streams:2
[h264 @ 000001baaeb68bc0] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 000001baaeb68bc0] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 000001baaeb68bc0] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 000001baaeb68bc0] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 000001baaeb68bc0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 000001baaeb68bc0] Format yuv420p chosen by get_format().
[h264 @ 000001baaeb68bc0] Reinit context to 1280x720, pix_fmt: yuv420p
[h264 @ 000001baaeb68bc0] no picture 
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001baaeb55300] All info found
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001baaeb55300] After avformat_find_stream_info() pos: 109849 bytes read:131072 seeks:0 frames:15
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Users\batuh\Auto-Subtitled-Video-Generator - Copy2\pages\local_transcript\output/input.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2016-08-24T03:50:36.000000Z
  Duration: 00:01:31.14, start: 0.000000, bitrate: 1149 kb/s
  Stream #0:0[0x1](und), 14, 1/90000: Video: h264 (Main) (avc1 / 0x31637661), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], 1020 kb/s, 29.97 fps, 29.97 tbr, 90k tbn (default)
    Metadata:
      creation_time   : 2016-08-24T03:50:36.000000Z
      handler_name    : ISO Media file produced by Google Inc.
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und), 1, 1/44100: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
    Metadata:
      creation_time   : 2016-08-24T03:50:36.000000Z
      handler_name    : ISO Media file produced by Google Inc.
      vendor_id       : [0][0][0][0]
Successfully opened the file.
Parsing a group of options: input url C:\Users\batuh\Auto-Subtitled-Video-Generator - Copy2\pages\local_transcript\output/output.wav.
Successfully parsed a group of options.
Opening an input file: C:\Users\batuh\Auto-Subtitled-Video-Generator - Copy2\pages\local_transcript\output/output.wav.
[NULL @ 000001baaec0e8c0] Opening 'C:\Users\batuh\Auto-Subtitled-Video-Generator - Copy2\pages\local_transcript\output/output.wav' for reading
[file @ 000001baaf24ee40] Setting default whitelist 'file,crypto,data'
[wav @ 000001baaec0e8c0] Format wav probed with size=2048 and score=99
[wav @ 000001baaec0e8c0] Before avformat_find_stream_info() pos: 78 bytes read:65614 seeks:1 nb_streams:1
[wav @ 000001baaec0e8c0] probing stream 0 pp:32
[wav @ 000001baaec0e8c0] probing stream 0 pp:31
[wav @ 000001baaec0e8c0] probing stream 0 pp:30
[wav @ 000001baaec0e8c0] probing stream 0 pp:29
[wav @ 000001baaec0e8c0] probing stream 0 pp:28
[wav @ 000001baaec0e8c0] probing stream 0 pp:27
[wav @ 000001baaec0e8c0] probing stream 0 pp:26
[wav @ 000001baaec0e8c0] probing stream 0 pp:25
[wav @ 000001baaec0e8c0] probing stream 0 pp:24
[wav @ 000001baaec0e8c0] probing stream 0 pp:23
[wav @ 000001baaec0e8c0] probing stream 0 pp:22
[wav @ 000001baaec0e8c0] probing stream 0 pp:21
[wav @ 000001baaec0e8c0] probing stream 0 pp:20
[wav @ 000001baaec0e8c0] probing stream 0 pp:19
[wav @ 000001baaec0e8c0] probing stream 0 pp:18
[wav @ 000001baaec0e8c0] probing stream 0 pp:17
[wav @ 000001baaec0e8c0] probing stream 0 pp:16
[wav @ 000001baaec0e8c0] probing stream 0 pp:15
[wav @ 000001baaec0e8c0] probing stream 0 pp:14
[wav @ 000001baaec0e8c0] probing stream 0 pp:13
[wav @ 000001baaec0e8c0] probing stream 0 pp:12
[wav @ 000001baaec0e8c0] probing stream 0 pp:11
[wav @ 000001baaec0e8c0] probing stream 0 pp:10
[wav @ 000001baaec0e8c0] probing stream 0 pp:9
[wav @ 000001baaec0e8c0] probing stream 0 pp:8
[wav @ 000001baaec0e8c0] probing stream 0 pp:7
[wav @ 000001baaec0e8c0] probing stream 0 pp:6
[wav @ 000001baaec0e8c0] probing stream 0 pp:5
[wav @ 000001baaec0e8c0] probing stream 0 pp:4
[wav @ 000001baaec0e8c0] probing stream 0 pp:3
[wav @ 000001baaec0e8c0] probing stream 0 pp:2
[wav @ 000001baaec0e8c0] probing stream 0 pp:1
[wav @ 000001baaec0e8c0] probed stream 0
[wav @ 000001baaec0e8c0] parser not found for codec pcm_s16le, packets or times may be invalid.
[wav @ 000001baaec0e8c0] max_analyze_duration 5000000 reached at 5120000 microseconds st:0
[wav @ 000001baaec0e8c0] After avformat_find_stream_info() pos: 176206 bytes read:262222 seeks:1 frames:42
Guessed Channel Layout for Input Stream #1.0 : mono
Input #1, wav, from 'C:\Users\batuh\Auto-Subtitled-Video-Generator - Copy2\pages\local_transcript\output/output.wav':
  Metadata:
    encoder         : Lavf59.34.101
  Duration: 00:01:31.14, bitrate: 256 kb/s
  Stream #1:0, 42, 1/16000: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 Hz, 1 channels, s16, 256 kb/s
Successfully opened the file.
[Parsed_subtitles_0 @ 000001baaeb7d040] Setting 'filename' to value 'C\:\\Users\\batuh\\Auto-Subtitled-Video-Generator - Copy2\\pages\\local_transcript\\output/transcript.srt'
[Parsed_subtitles_0 @ 000001baaeb7d040] libass API version: 0x1600010
[Parsed_subtitles_0 @ 000001baaeb7d040] libass source: commit: 0.16.0-48-g75a3dbac9bd41842a4d00b0d42c9513e2c8aec67
[Parsed_subtitles_0 @ 000001baaeb7d040] Raster: FreeType 2.12.1
[Parsed_subtitles_0 @ 000001baaeb7d040] Shaper: FriBidi 1.0.12 (SIMPLE) HarfBuzz-ng 5.3.1 (COMPLEX)
[Parsed_subtitles_0 @ 000001baaeb7d040] Initialized
[NULL @ 000001baaf473400] Opening 'C\:\\Users\\batuh\\Auto-Subtitled-Video-Generator - Copy2\\pages\\local_transcript\\output/transcript.srt' for reading
[file @ 000001baaeb7dc40] Setting default whitelist 'file,crypto,data'
[Parsed_subtitles_0 @ 000001baaeb7d040] Unable to open C\:\\Users\\batuh\\Auto-Subtitled-Video-Generator - Copy2\\pages\\local_transcript\\output/transcript.srt
[AVFilterGraph @ 000001baaf24ef40] Error initializing filter 'subtitles' with args 'C\\\:\\\\Users\\\\batuh\\\\Auto-Subtitled-Video-Generator - Copy2\\\\pages\\\\local_transcript\\\\output/transcript.srt'
Error initializing complex filters.
Invalid argument
[AVIOContext @ 000001baaeb5f880] Statistics: 131072 bytes read, 0 seeks
[AVIOContext @ 000001baaf10b2c0] Statistics: 262222 bytes read, 1 seeks



  


  I tried doing all ffmpeg related things under the generate_subtitled_video function but couldn't make it work either.

  


• How to encode Planar 4:2:0 (fourcc P010)

  20 juillet 2021, par DennisFleurbaaij

  I'm trying to recode fourcc V210 (which is a packed YUV4:2:2 format) into a P010 (planar YUV4:2:0). I think I've implemented it according to spec, but the renderer is giving a wrong image so something is off. Decoding the V210 has a decent example in ffmpeg (defines are modified from their solution) but I can't find a P010 encoder to look at what I'm doing wrong.

  


  (Yes, I've tried ffmpeg and that works but it's too slow for this, it takes 30ms per frame on an Intel Gen11 i7)

  


  Clarification (after @Frank's question) : The frames being processed are 4k (3840px wide) and hence there is no code for doing the 128b alignment.

  


  This is running on intel so little endian conversions applied.

  


  Try1 - all green image :

  


  The following code

  


  #define V210_READ_PACK_BLOCK(a, b, c) \
    do {                              \
        val  = *src++;                \
        a = val & 0x3FF;              \
        b = (val >> 10) & 0x3FF;      \
        c = (val >> 20) & 0x3FF;      \
    } while (0)

#define PIXELS_PER_PACK 6
#define BYTES_PER_PACK (4*4)

void MyClass::FormatVideoFrame(
    BYTE* inFrame,
    BYTE* outBuffer)
{
    const uint32_t pixels = m_height * m_width;

    const uint32_t* src = (const uint32_t *)inFrame);

    uint16_t* dstY = (uint16_t *)outBuffer;

    uint16_t* dstUVStart = (uint16_t*)(outBuffer + ((ptrdiff_t)pixels * sizeof(uint16_t)));
    uint16_t* dstUV = dstUVStart;

    const uint32_t packsPerLine = m_width / PIXELS_PER_PACK;

    for (uint32_t line = 0; line < m_height; line++)
    {
        for (uint32_t pack = 0; pack < packsPerLine; pack++)
        {
            uint32_t val;
            uint16_t u, y1, y2, v;

            if (pack % 2 == 0)
            {
                V210_READ_PACK_BLOCK(u, y1, v);
                *dstUV++ = u;
                *dstY++ = y1;
                *dstUV++ = v;

                V210_READ_PACK_BLOCK(y1, u, y2);
                *dstY++ = y1;
                *dstUV++ = u;
                *dstY++ = y2;

                V210_READ_PACK_BLOCK(v, y1, u);
                *dstUV++ = v;
                *dstY++ = y1;
                *dstUV++ = u;

                V210_READ_PACK_BLOCK(y1, v, y2);
                *dstY++ = y1;
                *dstUV++ = v;
                *dstY++ = y2;
            }
            else
            {
                V210_READ_PACK_BLOCK(u, y1, v);
                *dstY++ = y1;

                V210_READ_PACK_BLOCK(y1, u, y2);
                *dstY++ = y1;
                *dstY++ = y2;

                V210_READ_PACK_BLOCK(v, y1, u);
                *dstY++ = y1;

                V210_READ_PACK_BLOCK(y1, v, y2);
                *dstY++ = y1;
                *dstY++ = y2;
            }
        }
    }

#ifdef _DEBUG

    // Fully written Y space
    assert(dstY == dstUVStart);

    // Fully written UV space
    const BYTE* expectedVurrentUVPtr = outBuffer + (ptrdiff_t)GetOutFrameSize();
    assert(expectedVurrentUVPtr == (BYTE *)dstUV);

#endif
}

// This is called to determine outBuffer size
LONG MyClass::GetOutFrameSize() const
{
    const LONG pixels = m_height * m_width;

    return
        (pixels * sizeof(uint16_t)) +  // Every pixel 1 y
        (pixels / 2 / 2 * (2 * sizeof(uint16_t)));  // Every 2 pixels and every odd row 2 16-bit numbers
}


  


  Leads to all green image. This turned out to be a missing bit shift to place the 10 bits in the upper bits of the 16-bit value as per the P010 spec.

  


  Try 2 - Y works, UV doubled ?

  


  Updated the code to properly (or so I think) shifts the YUV values to the correct position in their 16-bit space.

  


  #define V210_READ_PACK_BLOCK(a, b, c) \
    do {                              \
        val  = *src++;                \
        a = val & 0x3FF;              \
        b = (val >> 10) & 0x3FF;      \
        c = (val >> 20) & 0x3FF;      \
    } while (0)


#define P010_WRITE_VALUE(d, v) (*d++ = (v << 6))

#define PIXELS_PER_PACK 6
#define BYTES_PER_PACK (4 * sizeof(uint32_t))

// Snipped constructor here which guarantees that we're processing
// something which does not violate alignment.

void MyClass::FormatVideoFrame(
    const BYTE* inBuffer,
    BYTE* outBuffer)
{   
    const uint32_t pixels = m_height * m_width;
    const uint32_t aligned_width = ((m_width + 47) / 48) * 48;
    const uint32_t stride = aligned_width * 8 / 3;

    uint16_t* dstY = (uint16_t *)outBuffer;

    uint16_t* dstUVStart = (uint16_t*)(outBuffer + ((ptrdiff_t)pixels * sizeof(uint16_t)));
    uint16_t* dstUV = dstUVStart;

    const uint32_t packsPerLine = m_width / PIXELS_PER_PACK;

    for (uint32_t line = 0; line < m_height; line++)
    {
        // Lines start at 128 byte alignment
        const uint32_t* src = (const uint32_t*)(inBuffer + (ptrdiff_t)(line * stride));

        for (uint32_t pack = 0; pack < packsPerLine; pack++)
        {
            uint32_t val;
            uint16_t u, y1, y2, v;

            if (pack % 2 == 0)
            {
                V210_READ_PACK_BLOCK(u, y1, v);
                P010_WRITE_VALUE(dstUV, u);
                P010_WRITE_VALUE(dstY, y1);
                P010_WRITE_VALUE(dstUV, v);

                V210_READ_PACK_BLOCK(y1, u, y2);
                P010_WRITE_VALUE(dstY, y1);
                P010_WRITE_VALUE(dstUV, u);
                P010_WRITE_VALUE(dstY, y2);

                V210_READ_PACK_BLOCK(v, y1, u);
                P010_WRITE_VALUE(dstUV, v);
                P010_WRITE_VALUE(dstY, y1);
                P010_WRITE_VALUE(dstUV, u);

                V210_READ_PACK_BLOCK(y1, v, y2);
                P010_WRITE_VALUE(dstY, y1);
                P010_WRITE_VALUE(dstUV, v);
                P010_WRITE_VALUE(dstY, y2);
            }
            else
            {
                V210_READ_PACK_BLOCK(u, y1, v);
                P010_WRITE_VALUE(dstY, y1);

                V210_READ_PACK_BLOCK(y1, u, y2);
                P010_WRITE_VALUE(dstY, y1);
                P010_WRITE_VALUE(dstY, y2);

                V210_READ_PACK_BLOCK(v, y1, u);
                P010_WRITE_VALUE(dstY, y1);

                V210_READ_PACK_BLOCK(y1, v, y2);
                P010_WRITE_VALUE(dstY, y1);
                P010_WRITE_VALUE(dstY, y2);
            }
        }
    }

#ifdef _DEBUG

    // Fully written Y space
    assert(dstY == dstUVStart);

    // Fully written UV space
    const BYTE* expectedVurrentUVPtr = outBuffer + (ptrdiff_t)GetOutFrameSize();
    assert(expectedVurrentUVPtr == (BYTE *)dstUV);

#endif
}


  


  This leads to the Y being correct and the amount of lines for U and V as well, but somehow U and V are not overlaid properly. There are two versions of it seemingly mirrored through the center vertical. Something similar but less visible for zeroing out V. So both of these are getting rendered at half the width ? Any tips appreciated :)

  


  Fix :
Found the bug, I'm flipping VU not per pack but per block

  


  if (pack % 2 == 0)


  


  Should be

  


  if (line % 2 == 0)


  


• Ffmpeg program to stitch image side by side

  14 mars 2021, par Beyond Motivation

  So I have about 90-100 images which are of the resolution 1080x1920px. I want to make a program in ffmpeg that will join them as in stitch them side by side(horizontally), such that all the images combine to become a wide image. Can someone pls help me with a program for this ?