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    5 septembre 2013, par

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Sur d’autres sites (11527)

  • Android : Show quick preview (live) before exporting FFmpeg Video

    1er mai 2023, par akash varlani

    Basically, I am developing a video editing app that lets the user choose some of their images and create a video slide show with music.

    



    I am using FFMPEG to generate video slide show from images but the problem is I can only show the preview of the video after executing FFMPEG command.

    



    Is googled so many blogs and all and I know there is a possible way available to display the preview of the output.

    



    Check below image from reference app. I am developing something similar to this app. There is an option to replace the image in the video. This app displays instant preview once I change the image.

    



    enter image description here

    



    Here is the link of the reference app if anyone wants to check :

    



    Clicking an EXPORT button this app lets you generate a video output. I can do that as I know FFMPEG and how to generate OUTPUT FILE using FFMPEG but what I don't know is how to display a quick preview of OUTPUT VIDEO before generating actual VIDEO FILE.

    



    On my UBUNTU device, I can view the output of FFMPEG command using FFPLAY tool but how to do the same on android device.

    



    Some useful link :
http://androidwarzone.blogspot.com/2011/12/ffmpeg4android.html

    


  • About Ffmpeg,Console show 'frame=0 fps=0.0 q=0.0 Lsize=0kB time=00:00:00.00' No data pull&push

    9 janvier 2019, par Lus

    I want to use Ffmpeg to pull&push video stream from HLS to RTMP.at first it’s normal,but when I open more,it’s run normally ,but no video data pull&push

    Environment：Windows64+Ngg-§rtmp-static+Ffmpeg-static+Java1.8

    It’s useless,even if I restart rtmp-server.

    ffmpeg -i xxx/live.m3u8 -vcodec h264-s 720*480 -an -f flv -y rtmp://xxx

    The first few video streams is normal,but when I open more streams (5+),
    it run normally,but no data pull.like this.

    2019-01-08 10:58:15.658  INFO ->frame=0 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=720 speed=   0x
    
2019-01-08 10:58:16.598  INFO ->[http @ 0000015efc568280] Opening 'xxx/1/live.m3u8' for reading
    
2019-01-08 10:58:16.984  INFO ->[http @ 0000015efb1200c0] Opening 'xxx/1/seghik30.ts' for reading
    
2019-01-08 10:58:17.083  INFO ->frame=    0 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=744 speed=   0x    
    
2019-01-08 10:58:18.033  INFO ->[http @ 0000015efc568280] Opening 'xxx/1/live.m3u8' for reading
    
2019-01-08 10:58:18.146  INFO ->[http @ 0000015efb1200c0] Opening 'xxx/1/seghik31.ts' for reading
    
2019-01-08 10:58:18.267  INFO ->frame=    0 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=770 speed=   0x    
    
2019-01-08 10:58:19.220  INFO ->[http @ 0000015efc568280] Opening 'xxx/1/live.m3u8' for reading
    
2019-01-08 10:58:19.317  INFO ->[http @ 0000015efb1200c0] Opening 'xxx/1/seghik32.ts' for reading
    
2019-01-08 10:58:19.415  INFO ->[http @ 0000015efb138600] Opening 'xxx/1/seghik33.ts' for reading
    
2019-01-08 10:58:19.494  INFO ->frame=    0 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=795 speed=   0x    
    
2019-01-08 10:58:20.375  INFO ->[http @ 0000015efc568280] Opening 'xxx/1/live.m3u8' for reading
    
2019-01-08 10:58:20.486  INFO ->[http @ 0000015efb138600] Opening 'xxx/1/seghik34.ts' for reading

  • How can I change slice_type which is show in Elecard stream analyzer using ffmpeg ?

    10 octobre 2018, par Tooraj Jam

    I’m not ffmpeg and encodding expert and am trying to encode a MP4 file to MPEG-4 h264 .ts file.

    When Elecard stream analyzer is analyzing my result .ts file, it shows slice_type = 7 for all of i-frames as you can see in the attached screenshot.

    How can I change all these to slice_type = 2 ?

    My ffmpeg command :

    -i Source.mp4 \
    
-filter:v 'setpts=0+PTQ-STARTPTS' -metadata:s:v:0 start_time=0 \
    
-f adts -c:a libfdk_aac  -profile:a aac_he  -strict -2 -ar 48000 -b:a 48k \
    
-f mpegts -c:v libx264  -vbsf h264_mp4toannexb -strict experimental -    profile:v main -level:v 3.0 -preset:v slow -movflags faststart -pat_period 100 \
    
-x264opts nal-hrd=cbr:force-cfr=1 -crf 25 -vf scale=w=640:h=360 -aspect 16:9 \
    
-bf 1  -sc_threshold 0 -keyint_min 2*25 -g 2*25 \
    
-force_key_frames "expr:gte(t,n_forced*50)" -max_muxing_queue_size 1500k \
    
-coder 1  -refs 2 \
    
-b:v 750k -minrate 750k -maxrate 750k -bufsize 1500k \
    
-vsync 1 -framerate 25000/1001 \
    
-x264opts "bitrate=750:vbv-maxrate=750:vbv-bufsize=1500"\
    
-pix_fmt yuv420p  -r 25 -x264opts force-cfr \
    
-mbs_per_slice 1 -y dest.ts

    enter image description here

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