[FFmpeg-user] Overlay / filter chain maximum question

[Conan Jen]

Hi all,

I've got a rather weird situation going on with a large overlay filter
chain that I would appreciate some input on.

For starters: I've attached both the filter_complex_script and the debug
log from the run to this email (complex_script.txt and debug.log), and the
command we're using is the following

FFREPORT="level=40:file=debug.log" /opt/bin/ffmpeg -threads 1 -y -t 70.8
-filter_complex_script complex_script.txt -map '[trimmed_audio]' -map
'[out]' -preset ultrafast -movflags +faststart new.mp4

Basically what is going on: we've got an input mp4 that is being seeked /
scaled / overlaid on top of a background png, with a title png then placed
above it, and a series of "subtitle" pngs overlaid at specific time
intervals to achieve a "karaoke" effect. Running this locally on my machine
(with the precompiled ffmpeg binary from https://johnvansickle.com/ffmpeg/)
results in an output that is expected.

However, shifting this exact same command + everything over to an AWS
Lambda worker results in the attached debug log, where it errors out with

[Parsed_movie_286 @ 0x760a1c0] Failed to open codec

As far as I can gather from this log, it seems setting up the inputs via
the movie directive in the complex_script is working fine, but when it
attempts to set up the overlay filter chain at the end it fails on that
specific filter. For additional reference, we have a video input, an audio
input, a background, a title, and then 139 png overlays that successfully
process but the 140th causes the "Failed to open codec" error.

Is there anything I should be checking on the environment side of things?
Perhaps the container running ffmpeg is missing some configuration related
to needed codecs or prerequisites that would make this work? Or is this
something related to ffmpeg that I'm completely missing?

Thanks so much for your help!

-conan
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[out][ovrly_fade_222]overlay=enable='between(t,66.80000000000018,67.19999999999982)'[out];
[out][ovrly_fade_223]overlay=enable='between(t,67.19999999999982,67.59999999999991)'[out];
[out][ovrly_fade_224]overlay=enable='between(t,67.59999999999991,67.80000000000018)'[out];
[out][ovrly_fade_225]overlay=enable='between(t,67.80000000000018,68.09999999999991)'[out];
[out][ovrly_fade_226]overlay=enable='between(t,68.09999999999991,68.30000000000018)'[out];
[out][ovrly_fade_227]overlay=enable='between(t,68.30000000000018,68.5)'[out];
[out][ovrly_fade_228]overlay=enable='between(t,68.5,68.59999999999991)'[out];
[out][ovrly_fade_229]overlay=enable='between(t,68.59999999999991,68.90000000000009)'[out];
[out][ovrly_fade_230]overlay=enable='between(t,68.90000000000009,69.19999999999982)'[out];
[out][ovrly_fade_231]overlay=enable='between(t,69.19999999999982,69.5)'[out];
[out][ovrly_fade_232]overlay=enable='between(t,69.5,69.80000000000018)'[out];
[out][ovrly_fade_233]overlay=enable='between(t,69.80000000000018,69.90000000000009)'[out];
[out][ovrly_fade_234]overlay=enable='between(t,69.90000000000009,70.09999999999991)'[out];
[out][ovrly_fade_235]overlay=enable='between(t,70.09999999999991,70.19999999999982)'[out];
[out][ovrly_fade_236]overlay=enable='between(t,70.19999999999982,70.40000000000009)'[out];
[out][ovrly_fade_237]overlay=enable='between(t,70.40000000000009,70.80000000000018)'[out]
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