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Sur d’autres sites (8349)

  • How to Speed Up Two-Pass Encoding ?

    27 juillet 2017, par Matt McManis

    I have a Video file with Audio, Subtitles, Chapters, and Metadata.

    I removed Audio and Subtitles with -an -sn from -pass 1 and then inlclude them in -pass 2.

    What about for Chapters and Metadata ? And how do you apply Turbo to -pass 1 ?

    Is there anything more that can be done ?

    I have a script that will convert mpg to mp4. I’ve sorted it with linebreaks so it’s easier to read.

    Pass 1

    "C:\Videos\example.mpg" 
    

    
-vcodec libx264 
    
-preset medium -b:v 2500K -pix_fmt yuv420p -qcomp 0.8 
    
-vf scale="trunc(iw/2)*2:trunc(ih/2)*2" 
    
-pass 1 
    

    
-map 0:v:0? -an -sn
    

    
-threads 8 
    

    
"C:\Videos\example.mp4"

    Pass 2

    ffmpeg -y -i 
    

    
"C:\Videos\example.mpg" 
    

    
-vcodec libx264 
    
-preset medium -b:v 2500K -pix_fmt yuv420p -qcomp 0.8 
    
-vf scale="trunc(iw/2)*2:trunc(ih/2)*2" 
    
-pass 2 
    

    
-acodec aac 
    
-b:a 320k 
    
-af volume=1.2 
    

    
-map 0:v:0? -map 0:a:0? -map 0:s? -c:s copy -map_metadata 0 
    

    
-threads 8 
    

    
"C:\Videos\example.mp4"

  • avfilter/vsrc_gradients : make rotation always continuous if speed changes

    3 décembre 2023, par Paul B Mahol
    avfilter/vsrc_gradients : make rotation always continuous if speed changes
    • [DH] libavfilter/vsrc_gradients.c

  • Android NDK - FFMpeg, correct video seeking

    15 mars 2012, par sherman

    I want change the seek frame while playing video. I do :

    void Java_ffvideolivewallpaper_frankandrobot_com_NativeCalls_seekFrame(
    JNIEnv *env, jobject this, jint time) 

    if (av_seek_frame(pFormatCtx, videoStream, time, AVSEEK_FLAG_ANY) < 0)
    
    __android_log_print(ANDROID_LOG_DEBUG, "ERROR SEEK!!!->>>",
    
            "av_seek_frame failed.");

    Video is displayed incorrectly. How do this correctly ?

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