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digitalmars.D - MP4 Library

reply Ron Tarrant <rontarrant gmail.com> writes:
Hi all,
Anyone know of a library similar to OpenCV that can be used from 
D to create MP4 files from a series of images? I think I came 
across some mention of OpenCV bindings, but I can't find it now.

Any help would be most welcome and appreciated. Thanks.
Aug 19
next sibling parent reply Jordan Wilson <wilsonjord gmail.com> writes:
On Monday, 19 August 2024 at 18:18:57 UTC, Ron Tarrant wrote:

 Hi all,
 Anyone know of a library similar to OpenCV that can be used 
 from D to create MP4 files from a series of images? I think I 
 came across some mention of OpenCV bindings, but I can't find 
 it now.

 Any help would be most welcome and appreciated. Thanks.


dcv might be something you are interested in looking at.
I've used dmagick + process pipes to `ffmpeg` myself, and found 
it pretty straightforward (dmagick might be heavy for your use, 
if it's just simply image loading there'll be more lightweight 
libs available I imagine).

Jordan
Aug 19
next sibling parent Ron Tarrant <rontarrant gmail.com> writes:
On Tuesday, 20 August 2024 at 03:32:03 UTC, Jordan Wilson wrote:


 dcv might be something you are interested in looking at.



 I've used dmagick + process pipes to `ffmpeg` myself



Thanks, Jordan. I'll check those out.
Aug 20
prev sibling parent Elias Batek <desisma heidel.beer> writes:
On Tuesday, 20 August 2024 at 03:32:03 UTC, Jordan Wilson wrote:

 process pipes to `ffmpeg`


By the way, there’s a wrapper for this exact purpose in arsd:
https://github.com/adamdruppe/arsd/blob/master/pixmaprecorder.d
Aug 21
prev sibling next sibling parent reply IchorDev <zxinsworld gmail.com> writes:
On Monday, 19 August 2024 at 18:18:57 UTC, Ron Tarrant wrote:

 Hi all,
 Anyone know of a library similar to OpenCV that can be used 
 from D to create MP4 files from a series of images? I think I 
 came across some mention of OpenCV bindings, but I can't find 
 it now.

 Any help would be most welcome and appreciated. Thanks.


If you know how to use ffmpeg as a library then there’s very good 
bindings in the form of 
[ffmpeg-d](https://code.dlang.org/packages/ffmpeg-d). If you have 
never used ffmpeg as a library then I’ll send you a warning: the 
API is confusing, the documentation is vague, and every example 
you can find online will use deprecated/removed functionality 
somewhere.
Other than that, the existing options for encoding videos in D 
are pretty sparse. I would love to write some bindings to try and 
help the situation, but I’m not sure what libraries would be 
good. Are there any C/C++ libraries that developers prefer for 
video encoding, decoding, and manipulation?
Aug 22
next sibling parent Paolo Invernizzi <paolo.invernizzi gmail.com> writes:
On Thursday, 22 August 2024 at 14:01:50 UTC, IchorDev wrote:

 On Monday, 19 August 2024 at 18:18:57 UTC, Ron Tarrant wrote:

 [...]


 If you know how to use ffmpeg as a library then there’s very 
 good bindings in the form of 
 [ffmpeg-d](https://code.dlang.org/packages/ffmpeg-d). If you 
 have never used ffmpeg as a library then I’ll send you a 
 warning: the API is confusing, the documentation is vague, and 
 every example you can find online will use deprecated/removed 
 functionality somewhere.
 Other than that, the existing options for encoding videos in D 
 are pretty sparse. I would love to write some bindings to try 
 and help the situation, but I’m not sure what libraries would 
 be good. Are there any C/C++ libraries that developers prefer 
 for video encoding, decoding, and manipulation?


Just to add that importC works pretty fine against ffmpeg, and 
it's a big plus as ffmpeg API is pretty fluid from release to 
release.
Aug 26
prev sibling parent reply Ron Tarrant <rontarrant gmail.com> writes:
On Thursday, 22 August 2024 at 14:01:50 UTC, IchorDev wrote:

 On Monday, 19 August 2024 at 18:18:57 UTC, Ron Tarrant wrote:

 If you


 have never used ffmpeg as a library then I’ll send you a 
 warning: the API is confusing, the documentation is vague, and 
 every example you can find online will use deprecated/removed 
 functionality somewhere.


LOL! That's very comforting. :)


 Other than that, the existing options for encoding videos in D 
 are pretty sparse. I would love to write some bindings to try 
 and help the situation, but I’m not sure what libraries would 
 be good. Are there any C/C++ libraries that developers prefer 
 for video encoding, decoding, and manipulation?


I saw an initial stab at creating OpenCV bindings, but it hasn't 
been touched in years. Perhaps that might be of interest?
Sep 11
next sibling parent Paolo Invernizzi <paolo.invernizzi gmail.com> writes:
On Wednesday, 11 September 2024 at 07:26:32 UTC, Ron Tarrant 
wrote:

 On Thursday, 22 August 2024 at 14:01:50 UTC, IchorDev wrote:

 On Monday, 19 August 2024 at 18:18:57 UTC, Ron Tarrant wrote:





 Are there any C/C++ libraries that developers prefer for video 
 encoding, decoding, and manipulation?


 I saw an initial stab at creating OpenCV bindings, but it 
 hasn't been touched in years. Perhaps that might be of interest?


I suggest to go directly for ffmpeg usage, importC is pretty 
usable with that.
It's pretty low level, but it's the common engine for a bazar of 
external tools.

/P
Sep 11
prev sibling parent IchorDev <zxinsworld gmail.com> writes:
On Wednesday, 11 September 2024 at 07:26:32 UTC, Ron Tarrant 
wrote:

 On Thursday, 22 August 2024 at 14:01:50 UTC, IchorDev wrote:

 LOL! That's very comforting. :)


Yes, rest assured: it sucks!


 I saw an initial stab at creating OpenCV bindings, but it 
 hasn't been touched in years. Perhaps that might be of interest?


Do people like OpenCV? I don't hear about it much. Also, were 
these bindings to the C or C++ API?
Sep 20
prev sibling parent reply Andrea Fontana <nospam example.org> writes:
On Monday, 19 August 2024 at 18:18:57 UTC, Ron Tarrant wrote:

 Hi all,
 Anyone know of a library similar to OpenCV that can be used 
 from D to create MP4 files from a series of images? I think I 
 came across some mention of OpenCV bindings, but I can't find 
 it now.

 Any help would be most welcome and appreciated. Thanks.


```
import std;

void main()
{

    // A mp4 1fps (-r 1) with standard settings
    auto pp = pipeShell("ffmpeg -y -r 1 -f png_pipe -c:v png -i - 
-c:v libx264 -crf 24 test.mp4", Redirect.all);

    // Feed frames from stdin
    pp.stdin.rawWrite(std.file.read("/path/to/your/frame1.png"));
    pp.stdin.rawWrite(std.file.read("/path/to/your/frame2.png"));
    pp.stdin.rawWrite(std.file.read("/path/to/your/frame3.png"));

    // Flush & close stdin
    pp.stdin.flush();
    pp.stdin.close();

    // Wait for ffmpeg to finish the job
    pp.pid.wait();
}
```

Andrea
Sep 11
parent Guillaume Piolat <guillaume.piolat gmail.com> writes:
On Wednesday, 11 September 2024 at 16:23:16 UTC, Andrea Fontana 
wrote:

 ```
 import std;

 void main()
 {

    // A mp4 1fps (-r 1) with standard settings
    auto pp = pipeShell("ffmpeg -y -r 1 -f png_pipe -c:v png -i 
 - -c:v libx264 -crf 24 test.mp4", Redirect.all);

    // Feed frames from stdin
    pp.stdin.rawWrite(std.file.read("/path/to/your/frame1.png"));
    pp.stdin.rawWrite(std.file.read("/path/to/your/frame2.png"));
    pp.stdin.rawWrite(std.file.read("/path/to/your/frame3.png"));

    // Flush & close stdin
    pp.stdin.flush();
    pp.stdin.close();

    // Wait for ffmpeg to finish the job
    pp.pid.wait();
 }
 ```

 Andrea


If you want to create a .y4m file without ffmpeg, here is old 
code (probably doesn't really build anymore):
- https://github.com/p0nce/y4m-d let's you create a .y4m
- https://github.com/p0nce/y4m-tools for manipulating such files
- in particular, creating a YUV frame necessitate conversion from 
sRGB such as in 
https://github.com/p0nce/y4m-tools/blob/master/shader-capture/source/app.d#L359
Sep 11