libilbc | Packaged version of iLBC codec from the WebRTC project | Build Tool library

I need to put overlay images to a video. It is working on Android without problem. But on iOS platform, if I try 23-24 overlay images, it is working correctly. If I try it with 30+ images, it gives memory allocation error.

Error while filtering: Cannot allocate memory

Failed to inject frame into filter network: Cannot allocate memory

Every overlay image is around 50 kb Video is around 250 MB I tried with smaller images, so I can use 40+ images without problem, so it is not related with counts, it is related with file size. I think there is a limit like 1MB for complex filter streams.

I tried lots of thinks but no luck.. I have two questions:

1. Is my ffmpeg command correct?
2. Can you suggest me any improvements, alternatives?

Update: What am I trying to do?

I'm trying to make burned subtitled video. But I also need to support emoji too. So I figured out it like these steps:

• Create all subtitle items as .png images.
• Overlay these images to video with correct timing.

FFmpeg Command:

I'm trying to convert all the songs in a folder from flac to alac. All the files in the folder are flac.

What I'm writing:

I am using flutter ffmpeg and try to save output video in local storage but getting error, plese help me I tried too many solutions but none of them worked. Thanking you :)
getting output path by path_provider package

i'm trying to write a shell script to analyse some videos by using the first frame of each second of video as a basis. i'm using ffmpeg to extract the frames. i thought i'd hit gold when this thread came up in my searches, but it doesn't handle the deinterlacing.

i'm using a time-based approach that works well for various formats as long as the video is progressive. it doesn't work so well for interlaced video (only the first field is output in that case, creating a half-height image). i've tried various combinations of deinterlacing (yadif/bwdif) with select but the filter chains i create either cause errors or still return a half-sized image.

here is my call w/a filter that works correctly for progressive video source :
ffmpeg -i $infile -vf "select='if(eq(n\,0),1,floor(t)-floor(prev_selected_t))" -vsync 0 $outfile

the following still return only half-height images for interlaced source :
... -vf "bwdif=0,select='if(eq(n\,0),1,floor(t)-floor(prev_selected_t))'"

... -vf "bwdif=0,select='between(mod(n\,$ips)\,1\,2)'" -- $ips is images per second

... -vf "select='between(mod(n\,$ips)\,1\,2)',bwdif=0"

i've also tried various permutations of the above w/explicit frame reference (-r, -vframes, ...), still no joy.

can someone help me with the syntax ?

--EDIT--
here is the complete output of running the command with the first filter :

I have a HEVC encoded 4k Video captured from a Reolink IP-Cam with VLC Player 3.0.14. I want to extract each frame of the video but the encoding stops after only two frames. This also happens when I try to convert into another video format. This happens on Windows and Ubuntu with different ffmpeg versions.

My command is:

Hello guys I am trying to create a web-dash manifest for VOD with ffmpeg, but I am getting this error Could not write header for output file #0 (incorrect codec parameters ?): Operation not permitted Error initializing output stream 0:2 -- while using vp9 codec and doesn't understand the error and how to resolve it. Can someone help me out? If I use vp8 instead of vp9 codec, I get the same error, but the ffmpeg log doesn't show any error.

I'm implementing a video editing feature on my Flutter App using the Flutter-FFmpeg package, [Adding watermarks on video] specifically, while executing the code I got this error:

When I try to convert a bunch of PNGs with alpha in them, the conversion works but there's this strange behavior where the pixels from previous frames do not get cleared and show up in the next frame where the background should just be fully transparent. It looks exactly the same as if you're drawing frames on top of each other without clearing the whole canvas in-between.

I'm speculating on what happens but I think given a frame N with a pixel RGBA (1, 0, 0, 1) and a frame N+1 with a pixel (0, 0, 0, 0), ffmped produces the second frame as (1, 0, 0, 1) when I want (0, 0, 0, 0).

Any way to force ffmpeg to try and clear all the pixels from the last frame before encoding the new frame?

Command I use:

Let me explain my problem, I am trying to access different channels in a DVR system. I have successfully gotten access to a single camera (channel 1) by using opencv as such: