[FFmpeg-user] Play video and simultaneously record audio
astroelectronic at t-online.de
Sat Jan 18 21:21:18 EET 2020
>> My second test:
>> ffmpeg -re -i test.mp4 -f dshow -channels 2 -i audio="Mikrofon
>> (Realtek High Definiti" -y -map 1:a audio.wav -map 0:v -f sdl2 -
>> This command line has two problems:
>> 1. The video doesn't play continuously, it's stop-and-go. May be my
>> notebook has not enough computing power? Any ideas how to avoid this
>> 2. FFmpeg doesn't stop when the end of the video has been reached.
>> The audio file gets longer than the video. I did already try to add
>> the -shortest option, but it didn't solve the problem.
> 1) Ok, let's pipe it to ffplay then.
> 2) The audio and playback video are independent outputs. So, ffmpeg
> will have to be manually stopped.
> ffmpeg -an -i test.mp4 -f dshow -channels 2 -i audio="Mikrofon
> (Realtek High Definiti" -y -map 1:a audio.wav -map 0:v -c copy -f
> mpegts - | ffplay -f mpegts -
I did try the above example (with some changes) but it has another
problem: FFplay can't be stopped when the video has ended, and it uses
the full screen. Which means I can't see the console window and can't
close it. FFmpeg can only be stopped by the task manager.
I found a better solution for the stop-and-go problem with sdl2. Adding
-audio_buffer_size 100 solves the problem:
ffmpeg -re -i test.mp4 -f dshow -audio_buffer_size 100 -channels 2 -i
audio="Mikrofon (Realtek High Definiti" -y -map 1:a audio.wav -map 0:v
-f sdl2 -
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