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Sur d’autres sites (9763)

  • Filtering of I P B frames from output

    5 janvier 2015, par Prashanth

    The command line below from the ffmpeg

    ffprobe -show_frames -pretty delta.mpg | grep 'pict_type' > pict_type.txt

    writes all the frame types to the file pict_type.txt.
    I counted the no of frames in the text file and I found out that there are 17 I frames, 133 B frames and 51 P frames. Now there is another command

    ffmpeg -i delta.mpg -vf select="eq(pict_type\,PICT_TYPE_I)" -s 400x300 -f image2  
    
frame.mpg-%03d.tif

    which should extract all the I frames(as per -vf select="eq(pict_type\,PICT_TYPE_I)" ) in the input file. But I got 197 frames instead of 17 from this command and it looked like command has just shown me all the frames.

    The first command output infers that there are 17 I frames but when I tried to extract only I frames I got 197 !! What might have gone wrong ??

  • How to write frames to a video file ?

    23 décembre 2013, par Mike Chen

    I am currently writing an application that read frames from camera, modify them, and save them into a video file. I'm planing to do it with ffmpeg. There's rarely a documentation about ffmpeg. I can't find a way. Does any know how to do it ?

    I need it to be done on unix, and in C or C++. Does any can provide some instructions ?

    Thanks.

    EDIT :

    Sorry, I haven't write clearly. I want some developer APIs to write frames to a video file. I open up camera stream, I get every single frame, then I save them into a video file with those APIs available in ffmpeg's public apis. So using command line tool actually doesn't help me. And I've seen output_example.c under the ffmpeg src folder. It's pretty great that I may copy some parts of the code directly without change. And I am still looking for a easier way.

    Also, I'm thinking of porting my app to iPhone, as far as I know, only ffmpeg has been ported on iPhone. GStreamer is based on glib, and it's all GNU stuff. I'm not sure if I can get it work on iPhone. So ffmpeg is still the best choice for now.

    Any comments is appreciated.

  • How to write frames to a video file ?

    20 juillet 2019, par Mike Chen

    I am currently writing an application that read frames from camera, modify them, and save them into a video file. I’m planing to do it with ffmpeg. There’s rarely a documentation about ffmpeg. I can’t find a way. Does any know how to do it ?

    I need it to be done on unix, and in C or C++. Does any can provide some instructions ?

    Thanks.

    EDIT :

    Sorry, I haven’t write clearly. I want some developer APIs to write frames to a video file. I open up camera stream, I get every single frame, then I save them into a video file with those APIs available in ffmpeg’s public apis. So using command line tool actually doesn’t help me. And I’ve seen output_example.c under the ffmpeg src folder. It’s pretty great that I may copy some parts of the code directly without change. And I am still looking for a easier way.

    Also, I’m thinking of porting my app to iPhone, as far as I know, only ffmpeg has been ported on iPhone. GStreamer is based on glib, and it’s all GNU stuff. I’m not sure if I can get it work on iPhone. So ffmpeg is still the best choice for now.

    Any comments is appreciated.

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