[FFmpeg-user] Delay filter reconfiguration

androiddevmar11 androiddevmar11 at gmail.com
Sat Jun 14 21:53:11 CEST 2014

thank you for hints. I am still trying to use adelal because concept of PTS
is not clear for me yet. Today I relased that I am probably not able to mix
many inputs at one go. Let's say that my mix scenario looks following: 

1 Input, video   	           5s del  |   10 frames |    4s del      |  15
frame |
                              ————————————————————— ————————

2 Input, video             1s del |   20 frames                              
                              ——————————————————— ————

3 Input, AAC file       |   60 frames                                                                 
                              —————————————————————— ——————————

At input 1 I configure "adelay to value 5 seconds. After 10 frames from
first input are read I need to destroy all graph and create delay filter
with value 4s. But I cannot do that because at input 2 frames reading is not
finished yet. I cannot destroy filter and recreate it after frames from
input 2 are read because at that moment I am to far in output file so I will
not achieve correct delay at input 1.  So for me it looks now that i cannot
mix many input at one go. I have to mix input 1 with input 3 first. Than mix
input 2 to the result of first mixing. But this is not very effecitve. I
believe that FFMPEG allows me to do it in better way. Where is mistake in
this approach??? Thank you for help.


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