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Rendering video in two separate windows.
Posted: 23 Sep 2015 22:14
by theonlylawislove
I noticed that the QT4 player can clone the video to multiple windows.
I need to do this from the API (libvlc). I have tried the following.
Code: Select all
char const *vlc_argv[] = {
"--no-xlib",
"--video-filter=clone", // I want to clone video
"--clone-count=2" // in two seperate windows
};
int done = 0, action = 0, pause = 0, n = 0;
libvlc_instance_t* vlc;
libvlc_media_t* md;
libvlc_media_list_t* ml;
libvlc_media_list_player_t* mlp;
libvlc_media_player_t* mp;
vlc = libvlc_new(sizeof(vlc_argv) / sizeof(*vlc_argv), vlc_argv);
md = libvlc_media_new_path(vlc, "D:\\bbb.avi");
ml = libvlc_media_list_new(vlc);
libvlc_media_list_add_media(ml, md);
mlp = libvlc_media_list_player_new(vlc);
libvlc_media_list_player_set_media_list(mlp, ml);
mp = libvlc_media_player_new(vlc);
libvlc_media_list_player_set_media_player(mlp, mp);
libvlc_media_list_player_play(mlp);
libvlc_media_player_set_hwnd(mp, NULL); // this would be the handle of my first window
libvlc_media_player_set_hwnd(mp, NULL); // and this would be the handle of my second window
However, I get this error in the standard output.
Code: Select all
[02869764] core video output error: Failed to create video filter2 'clone'
[02869764] core video output error: Failed to add filter 'clone'
How do I create two clones, and set the parent HWND for these two clones?
Re: Rendering video in two separate windows.
Posted: 23 Sep 2015 22:30
by theonlylawislove
I accidentally was using "filter" and not splitter. New code:
Code: Select all
char const *vlc_argv[] = {
"--no-xlib",
"--video-splitter=clone", // I want to clone video
"--clone-count=2" // in two seperate windows
};
I get the two windows now. But how do I set their parents individually?
Re: Rendering video in two separate windows.
Posted: 24 Sep 2015 12:00
by Rémi Denis-Courmont
You don't. Passing arguments to libvlc_new() is explicitly not supported.
Re: Rendering video in two separate windows.
Posted: 24 Sep 2015 12:05
by RSATom
I get the two windows now. But how do I set their parents individually?
You could use "vmem" module and decode video frames to memory, after that you could render it anywhere you like.
Re: Rendering video in two separate windows.
Posted: 24 Sep 2015 18:50
by theonlylawislove
I have started going down the vmem route. However, i am getting some errors when playing.
[swscaler @ 03844c20] bad dst image pointers
[swscaler @ 03844c20] bad dst image pointers
[swscaler @ 03844c20] bad dst image pointers
[swscaler @ 03844c20] bad dst image pointers
[swscaler @ 03844c20] bad dst image pointers
[swscaler @ 03844c20] bad dst image pointers
I am simply trying to setup a minimal example that does nothing at first, and I can't get it to work. I have seen the SDL example, but I need to allocate the buffer myself instead of having SDL handle it (since I am not using SDL).
Code: Select all
struct CMediaPlayer::Context {
Context() : picture(NULL) {}
picture_t* picture;
vlc_mutex_t mutex;
};
static unsigned int format_callback(
void **data,
char *chroma,
unsigned *width,
unsigned *height,
unsigned *pitches,
unsigned *lines)
{
CMediaPlayer::Context* context = (CMediaPlayer::Context*)(*data);
video_format_t format;
ZeroMemory(&format, sizeof(video_format_t));
format.i_width = *width;
format.i_height = *height;
format.i_chroma = vlc_fourcc_GetCodecFromString(VIDEO_ES, chroma);
picture_t* picture = picture_NewFromFormat(&format);
context->picture = picture;
vlc_mutex_init(&context->mutex);
return context->picture->i_planes;
}
static void format_cleanup
(
void *data
)
{
}
static void* on_lock
(
void* data,
void** plane
)
{
CMediaPlayer::Context* context = (CMediaPlayer::Context*)data;
vlc_mutex_lock(&context->mutex);
for (int planeNumber = 0; planeNumber < context->picture->i_planes; planeNumber++)
plane[planeNumber] = &context->picture->p[planeNumber].p_pixels;
return NULL;
}
static void on_unlock
(
void *data,
void *picture,
void *const *planes
)
{
CMediaPlayer::Context* context = (CMediaPlayer::Context*)data;
vlc_mutex_unlock(&context->mutex);
}
static void on_display(void* data, void* picture)
{
CMediaPlayer::Context* context = (CMediaPlayer::Context*)data;
BYTE* plane1 = context->picture->p[0].p_pixels;
}
Can you see why I would be getting these errors?
Re: Rendering video in two separate windows.
Posted: 24 Sep 2015 19:03
by RSATom
Re: Rendering video in two separate windows.
Posted: 24 Sep 2015 22:00
by theonlylawislove
Thanks, I got your code running and it works. After looking at it, I figured out why mine doesn't work. I am using the "I420" format that comes from the decoded video, and you are converting to RV32.
So, then the question is, why can't I use I420? It seems that most renderers can play YUV formats with limited effort, compared to RGB. Is it possible to use vmem with I420?
Re: Rendering video in two separate windows.
Posted: 24 Sep 2015 22:23
by theonlylawislove
I got I420 working with vmem. I had to add the following to the format callback.
Code: Select all
for (int planeNumber = 0; planeNumber < picture->i_planes; planeNumber++)
{
pitches[planeNumber] = picture->p[planeNumber].i_pitch;
lines[planeNumber] = picture->p[planeNumber].i_lines;
}
Re: Rendering video in two separate windows.
Posted: 25 Sep 2015 06:48
by RSATom
Re: Rendering video in two separate windows.
Posted: 25 Sep 2015 12:03
by parker
I have 2 controls "panel". How to put 2 VLC window panel.
EX: m_player.WindowHandle = panel1.Handle
m_player.WindowHandle = panel2.Handle