#9209: How to simplify amerge filter
-------------------------------------+-------------------------------------
Reporter: kvsico | Type:
| enhancement
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
How to reproduce:
I want to mix audio files, mono and stereo all possible, but the use of
amerge filter is complicated because I should identify channel of every
input[0], so I found this answer[4], the command like this:
```
ffmpeg -y\
-i a.mp3 \
-i b.mp3\
-filter_complex "
[0]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo[a0];[a0]volume=1[a00];[a00]adelay=2000|2000[a000];
[1]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo[a1];[a1]volume=1[a11];[a11]adelay=4000|4000[a111];
[a000][a111]amerge,pan=stereo|c0<c0+c2|c1<c1+c3" \
-ac 2 result.mp3
```
Can I use this command simplify use of amerge filter?
[0]:https://trac.ffmpeg.org/wiki/AudioChannelManipulation
[1]:https://stackoverflow.com/questions/54060729/ffmpeg-how-to-merge-all-
audio-streams-into-stereo
[2]:https://superuser.com/questions/1029466/how-to-mix-two-audio-files-
with-ffmpeg-amerge-filter
[3]:https://stackoverflow.com/questions/14498539/how-to-overlay-downmix-
two-audio-files-using-ffmpeg
[4]:https://superuser.com/questions/714879/simplify-ffmpeg-amerge-and-
volume-customization
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9209>
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