On 05/07/2024 14.34, Jim DeLaHunt wrote:
On 2024-07-04 15:50, Mark Filipak wrote:
...Here's the interesting terminal output (slightly beautified):
[Parsed_trim_1 @ 0000000000620040]
Media type mismatch between the 'Parsed_trim_1' filter output pad 0 (video) and the
'Parsed_atrim_2' filter input pad 0 (audio)
[AVFilterGraph @ 000000000061c7c0] Error linking filters
Failed to set value
'split=2[i5][i6],
[i5]trim=start_frame=481:end_frame=134047,
atrim=start_sample=962962:end_sample=268360092[o5],
[i6]trim=start_frame=138745:end_frame=246719[o6],
[o5][o6]concat=n=2'
for option 'filter_complex': Invalid argument
Error parsing global options: Invalid argument
I think there is a clue in the previous part of the output:
[Parsed_trim_1 @ 0000000000620040] Media type mismatch between the 'Parsed_trim_1' filter output
pad 0 (video) and the 'Parsed_atrim_2' filter input pad 0 (audio)
I see "media type mismatch", so what is not matched? I see a mention of "filter output pad 0
(video)" and "filter input pad 0 (audio)". I can imagine that media "video" does not match media
"audio".
...Here's my trim commands for the first segment:
trim=start_frame=481:end_frame=134047,atrim=start_sample=962962:end_sample=268360093
Consulting the filtergraph syntax documentation
<https://ffmpeg.org/ffmpeg-filters.html#Filtergraph-syntax-1>,
A filterchain consists of a sequence of connected filters, each one connected to the previous one
in the sequence. A filterchain is represented by a list of ","-separated filter descriptions.
It looks like your trim commands for the first segment consist of a `trim` filter which reads video
media from input pad [i5] and writes video media to an implicit output pad, connected to an `atrim`
filter which wants reads audio media from an implicit input pad. But the implicit output pad is
giving video media to a filter which wants audio media.
That looks like a type mismatch to me.
I agree. I expected that
[i5]trim=start_frame=481:end_frame=134047,
atrim=start_sample=962962:end_sample=268360092[o5]
was a stream and that atrim would operate only on the audio part of that stream. But it appears that
I may have to split the video and audio streams into two discrete streams (or maybe more if there
were more than one video stream and/or more than one audio stream). This is an architectural
shortcoming of FFmpeg and is something OFFmpeg does not suffer.
When I find the time, I'll explore this further and I'll try some of your good
ideas.
Thanks, Jim.
--Mark.
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