[FFmpeg-user] "Non-monotonous DTS in output stream" error, previous and current values are equal

[Dennis Mungai]

Try this: Add -dts_delta_threshold 0 *before* the input and retest.

On Sun, 23 Feb 2020, 16:27 Crazy Red Elephant via ffmpeg-user, <
ffmpeg-user at ffmpeg.org> wrote:

> I tried adding "-fflags +ignpts" before input but that didn't help, there
> are still DTS warnings, however, this time the values are not equal for
> some reason (except the first pair):
>
> [mp4 @ 000001a902a100c0] Non-monotonous DTS in output stream 0:0;
> previous: 6030, current: 6030; changing to 6031. This may result in
> incorrect timestamps in the output file.
> [mp4 @ 000001a902a100c0] Non-monotonous DTS in output stream 0:0;
> previous: 180204, current: 177177; changing to 180205. This may result in
> incorrect timestamps in the output file.
> [hls @ 000001a901cc9380] Opening 'crypto:part1.ts' for reading
> [mp4 @ 000001a902a100c0] Non-monotonous DTS in output stream 0:0;
> previous: 360384, current: 357357; changing to 360385. This may result in
> incorrect timestamps in the output file.
> [mp4 @ 000001a902a100c0] Non-monotonous DTS in output stream 0:0;
> previous: 540565, current: 537538; changing to 540566. This may result in
> incorrect timestamps in the output file.
> [hls @ 000001a901cc9380] Opening 'crypto:part2.ts' for reading
> [mp4 @ 000001a902a100c0] Non-monotonous DTS in output stream 0:0;
> previous: 720745, current: 717718; changing to 720746. This may result in
> incorrect timestamps in the output file.
> [mp4 @ 000001a902a100c0] Non-monotonous DTS in output stream 0:0;
> previous: 900925, current: 897898; changing to 900926. This may result in
> incorrect timestamps in the output file.
>
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Sunday, February 23, 2020 3:15 PM, Crazy Red Elephant via ffmpeg-user <
> ffmpeg-user at ffmpeg.org> wrote:
>
> > Guys please, I still have not found a solution and I'm so desperate :-(
> I asked this question on multiple sites and nobody is helping...
> >
> > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> > On Wednesday, February 12, 2020 12:44 AM, Ted Park
> kumowoon1025 at gmail.com wrote:
> >
> > > > 4.  A general question - is there any difference between (a)
> decrypting all .ts parts separately, then concatenating them into one big
> .ts file and remuxing it into .mp4 and (b) concatenating all encrypted .ts
> parts first, then decrypting the big .ts result file and then remuxing it
> into .mp4?
> > >
> > > This makes me think you are not decrypting the segments correctly, I
> had understood the specs to mean that if it isn’t specified, the IV needs
> to be incremented for each segment (so you would need to use
> 0x00000000000000000000000000000000 for the first segment,
> 0x00000000000000000000000000000001 for the second, etc. based on the
> initial media sequence number of 0).
> > > I don’t think the missing picture message at the end is unexpected,
> since the stream was cut arbitrarily after all, this is the result of my
> attempt at decrypting each segment with openssl and using cat to put them
> together (ffmpeg wasn’t used, except to test the file).
> > > https://media.kumowoon1025.com/videos/cat.ts
> https://media.kumowoon1025.com/videos/cat.ts
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