[FFmpeg-user] Same number of frames dropped and duplicated; What does that mean?

[Paul B Mahol]

On Sun, Oct 29, 2023 at 4:52 PM Ulf Zibis <Ulf.Zibis at cosoco.de> wrote:

>
> Am 29.10.23 um 16:00 schrieb Paul B Mahol:
> > On Sun, Oct 29, 2023 at 3:29 PM Ulf Zibis <Ulf.Zibis at cosoco.de> wrote:
> >
> >> Hi,
> >>
> >> so 18.3 % of the frames were dropped and duplicated at same time.
> >>
> >> Does that mean, that 8063 frames of the input were dropped and then same
> >> (or other) 8064 frames were duplicated to the output?
> >>
> > Probably variable frame rate input.
>
> When I use "-fps-mode passthroug", then I get messages of frames with the
> same timestamp, so ffmpeg seems to drop them in normal mode and then fills
> in duplicates.
>
> Am I right?
>
> So maybe it would be better to correct the timestamps than dropping the
> frames?
>

Could use vfrdet video filter on original input to find minimum, average
and maximum delay between frames.


>
> [mp4 @ 0x561ea7f2ab80] Non-monotonous DTS in output stream 0:0; previous:
> 0, current: 0; changing to 1. This may result in incorrect timestamps in
> the output file.
> [mp4 @ 0x561ea7f2ab80] Non-monotonous DTS in output stream 0:0; previous:
> 222053, current: 222053; changing to 222054. This may result in incorrect
> timestamps in the output file.
> [mp4 @ 0x561ea7f2ab80] Non-monotonous DTS in output stream 0:0; previous:
> 3996954, current: 3996954; changing to 3996955. This may result in
> incorrect timestamps in the output file.
> [mp4 @ 0x561ea7f2ab80] Non-monotonous DTS in output stream 0:0; previous:
> 4219007, current: 4219007; changing to 4219008. This may result in
> incorrect timestamps in the output file.
> [mp4 @ 0x561ea7f2ab80] Non-monotonous DTS in output stream 0:0; previous:
> 4441060, current: 4441060; changing to 4441061. This may result in
> incorrect timestamps in the output file.
> [mp4 @ 0x561ea7f2ab80] Non-monotonous DTS in output stream 0:0; previous:
> 5551325, current: 5551325; changing to 5551326. This may result in
> incorrect timestamps in the output file.
> [mp4 @ 0x561ea7f2ab80] Non-monotonous DTS in output stream 0:0; previous:
> 5773378, current: 5773378; changing to 5773379. This may result in
> incorrect timestamps in the output file.
> [mp4 @ 0x561ea7f2ab80] Non-monotonous DTS in output stream 0:0; previous:
> 5995431, current: 5995431; changing to 5995432. This may result in
> incorrect timestamps in the output file.
> [mp4 @ 0x561ea7f2ab80] Non-monotonous DTS in output stream 0:0; previous:
> 9548279, current: 9548279; changing to 9548280. This may result in
> incorrect timestamps in the output file.
> [mp4 @ 0x561ea7f2ab80] Non-monotonous DTS in output stream 0:0; previous:
> 9770332, current: 9770332; changing to 9770333. This may result in
> incorrect timestamps in the output file.
>
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