I’m trying to adapt a code in order to add a sound capture feature (on a live stream), with the help of ffmpeg and directshow.
When i try to play with ffplay the AVIsynth file, everything works perfectly i’ve got the audio and video. But when i open this input file by code i only find the video stream.
The Avs file :
V = DirectShowSource("Decklink_HDMI.grf", fps=10, framecount=1000000000, seek=false, audio=false)
A = DirectShowSource("Decklink_Audio.grf", fps=1, framecount=1000000000, video=false)
AudioDub(V, A)
The opening code :
ffmpeg::AVInputFormat * ifmt;
ifmt = ffmpeg::av_find_input_format("avs");
// Open input file
if(ffmpeg::avformat_open_input(&pFormatCtx, filename.toStdString().c_str(), ifmt, NULL) != 0)
When i make a variable lookout on gdb just after the opening.
i’m looking at nb_streams in pFormatCtx->nb_streams and it’s at 1
The only stream i can find in pFormatCtx->stream is a video one. And that’s why i’m not able to capture the sound.
So i’m asking if i’m doing something wrong with my opening or if i miss something.
Ps : I know the code shown is short but the problem appears at this very step !
Thank you
Kurt
— EDIT —
I’ve also noticed that when I dump the AVFormatContext the video stream got a 456×32 size.
And i can find this very same size of the window displayed when i try to launch a corrupted script with ffplay.
The original video format when i play the correct script with ffplay is of 1920×1080
I think my problem is maybe deeper than the simple fact of not being able to get the audio stream.
I’m trying to find out how to know the error message that is displayed on this 456×32 windows
— EDIT2 —
I Find out what is written on this image and my problem is solved, badly placed avs script an old one was is place.
I’m ashamed.
My bad,
A badly placed avs file was my problem.
Anyway ffmpeg is a bit painful in his way of showing error, being forced to make a snapshot without any error msg or exception raised (or maybe did i failled).