The Usage

The Command

The Problem

sometimes first and second is off by a few milliseconds.

Montage

The Usage

The Command

The Problem

Sometimes first and second is off by a few milliseconds.

Montage

# Set on call or global:
file_in=sample.mp4
pix_fmt=yuvj420p
sec_snap_interval=10
nr_start=1
pfx_out=snap


ffmpeg \
    -loglevel warning \
    -hwaccel cuvid \
    -hwaccel_output_format cuda \
    -c:v h264_cuvid \
    -i "$file_in" \
    -pix_fmt "$pix_fmt" \
    -filter:v "
        scale_cuda=
            w = -1 :
            h = 100,
        thumbnail_cuda = 2,
        hwdownload,
        format = nv12,
        select = 'bitor(
            gte(t - prev_selected_t, $sec_snap_interval),
            isnan(prev_selected_t)
        ')
    " \
    -vsync passthrough \
    -color_range 2 \
    -start_number "$nr_start" \
    "$pfx_out%09d.jpg"

# Set on call or global:
file_in=sample.mp4
pix_fmt=yuvj420p
sec_snap_interval=10
nr_start=1
pfx_out=snap


ffmpeg \
    -loglevel warning \
    -hwaccel cuvid \
    -hwaccel_output_format cuda \
    -c:v h264_cuvid \
    -i "$file_in" \
    -pix_fmt "$pix_fmt" \
    -filter:v "
        scale_cuda=
            w = -1 :
            h = 100,
        thumbnail_cuda = 2,
        hwdownload,
        format = nv12,
        select = 'bitor(
            gte(t - prev_selected_t, $sec_snap_interval),
            isnan(prev_selected_t)
        )'
    " \
    -vsync passthrough \
    -color_range 2 \
    -start_number "$nr_start" \
    "$pfx_out%09d.jpg"

Command I use now based on answer (shell):

# Set on call or global:
file_in=sample.mp4
pix_fmt=yuvj420p
sec_snap_interval=10
nr_start=1
pfx_out=snap


ffmpeg \
    -loglevel warning \
    -hwaccel cuvid \
    -hwaccel_output_format cuda \
    -c:v h264_cuvid \
    -i "$file_in" \
    -pix_fmt "$pix_fmt" \
    -filter:v "
        scale_cuda=
            w = -1 :
            h = 100,
        thumbnail_cuda = 2,
        hwdownload,
        format = nv12,
        select = 'bitor(
            gte(t - prev_selected_t, $sec_snap_interval),
            isnan(prev_selected_t)
        ')
    " \
    -vsync passthrough \
    -color_range 2 \
    -start_number "$nr_start" \
    "$pfx_out%09d.jpg"