Hi!
I'm trying to concatenate these two single frame videos
[https://files.catbox.moe/v85pqy.zip], but they always end up in the
wrong order.
I've tried with the following command:
ffmpeg -y -f concat -i filelist.txt -c copy outf.mkv
...where filelist.txt contains:
file '0012890a_9680.mkv'
file '0012890a_692070.mkv'
But this gives me a 2 frame video with the frame order reversed.
Examining the file with `ffprobe -show_frames`, it does indeed show the
frames in reverse (some lines omitted):
[FRAME]
key_frame=1
pts=42
pts_time=0.042000
best_effort_timestamp=42
best_effort_timestamp_time=0.042000
duration=41
duration_time=0.041000
pkt_pos=28240
pkt_size=88803
[FRAME]
key_frame=1
pts=0
pts_time=0.000000
best_effort_timestamp=0
best_effort_timestamp_time=0.000000
duration=41
duration_time=0.041000
pkt_pos=7976
pkt_size=20246
It's interesting to note that, according to `pkt_pos`, the frames are
written in correct order, and the PTS is also correct, however the order
listed is somehow incorrect.
If I reverse the order of the frames in filelist.txt, I get the order
expected. So it seems like ffmpeg really wants to put the second frame
first.
I've also tried adding `-bsf:v setts=ts=N` to the ffmpeg command - the
resulting PTS for the frames are 1 and 0, indicating correct packet
order, but frames listed in reverse.
I've also tried with mkvmerge, but get the same result (command:
`mkvmerge --output outm.mkv 0012890a_9680.mkv + 0012890a_692070.mkv
--append-to 1:0:0:0`)
Does anyone know what's going on and how to get the frames in the
correct order?
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