Newest 'ffmpeg' Questions - Stack Overflow

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Les articles publiés sur le site

  • How to calculate sizes for AVPicture.data[x] pointers (YUV420p) when using libffmpeg

    13 août 2013, par bradenV2

    I'm trying to get Y,U,V values separately in order to pass them to openGL and map to a texture. I know these values can be found in AVPicture.data[0] (Y) and AVPicture.data[1] (U) and AVPicture.data[2] (V) 

    avcodec_decode_video2(ctx, frame, &frameFinished, packet_data->packet);
AVPicture _avPicture;
picSize = avpicture_get_size(ctx->pix_fmt, ctx->width, ctx->height);
avpicture_alloc(&_avPicture, ctx->pix_fmt,ctx->width, ctx->height );
avpicture_fill(&_avPicture, packet_data->packet, ctx->pix_fmt,ctx->width,ctx->height);

    ^^ That's working fine. The issue I run into is passing the Y,U,V values back to Java via JNI. I have to know the size of the data the AVPicture.data[x] pointers point to. I've tried AVPicture.linesize to no avail, as well as:

               for (y = 0; y < ctx->height; y++){
                for (x = 0; x < ctx->width; x++){
                    yDataSize++;
                }
            }
            /* Cb and Cr */
            for (y = 0; y < ctx->height / 2; y++) {
                for (x = 0; x < ctx->width / 2; x++) {
                    uDataSize++;
                    vDataSize++;
                }
            }

    I'm really stuck, thanks!

  • Armv6 + ffmpeg + android = sigill (heap)

    13 août 2013, par frankish

    If I compile everything for armv7, it works perfectly. If I compile everything for armv6, it crashes when calling the first ffmpeg function and I don't understand the crash output.

    What can be the problem?

    I use ndk-8e and I use minSdk=8 targetSdk=17 I tried this on Android 2.2 emulator (with also high heap size=128mb to see if it works, but it's not..)

        08-11 18:36:28.904: I/DEBUG(30): signal 4 (SIGILL), fault addr 81247524
    08-11 18:36:28.904: I/DEBUG(30):  r0 81b346a0  r1 81b347bc  r2 81b34702  r3 00000002
    08-11 18:36:28.904: I/DEBUG(30):  r4 00000001  r5 00000002  r6 00005601  r7 0000011a
    08-11 18:36:28.904: I/DEBUG(30):  r8 814cf2d0  r9 8090eca1  10 00000001  fp 0022c928
    08-11 18:36:28.904: I/DEBUG(30):  ip 00000006  sp 5ca0173c  lr 812d6404  pc 81247524  cpsr 80000010
    08-11 18:36:29.014: D/dalvikvm(58): GC_FOR_MALLOC freed 10199 objects / 574352 bytes in 153ms
    08-11 18:36:29.183: I/DEBUG(30):          #00  pc 00247524  /data/data/com.myapp/lib/libffmpeg.so
    08-11 18:36:29.183: I/DEBUG(30):          #01  lr 812d6404  /data/data/com.myApp/lib/libffmpeg.so
    08-11 18:36:29.183: I/DEBUG(30): code around pc:
    08-11 18:36:29.183: I/DEBUG(30): 81247504 e15c0007 e14260b2 e5d35003 e5d3a002 
    08-11 18:36:29.183: I/DEBUG(30): 81247514 e5d34004 e1c260b0 e1a05085 e1a0308a 
    08-11 18:36:29.183: I/DEBUG(30): 81247524 e6ef5075 e064a005 e6ef3073 e28aa001 
    08-11 18:36:29.193: I/DEBUG(30): 81247534 e2836001 e0854004 e5c14000 e5c1a001 
    08-11 18:36:29.193: I/DEBUG(30): 81247544 e5c06001 e5c03000 e2822004 e2811002 
    08-11 18:36:29.193: I/DEBUG(30): code around lr:
    08-11 18:36:29.193: I/DEBUG(30): 812d63e4 eb057846 e3500000 1afffff7 e5943048 
    08-11 18:36:29.193: I/DEBUG(30): 812d63f4 e3530000 08bd8070 e1a00004 e12fff33 
    08-11 18:36:29.193: I/DEBUG(30): 812d6404 e8bd8070 007bbc14 007bbbe8 e92d4010 
    08-11 18:36:29.193: I/DEBUG(30): 812d6414 e5d1c001 e5d04001 e5d02000 e5d13000 
    08-11 18:36:29.193: I/DEBUG(30): 812d6424 e06c0004 e0633002 e0830400 e8bd8010 
    08-11 18:36:29.193: I/DEBUG(30): stack:
    08-11 18:36:29.193: I/DEBUG(30):     5ca016fc  00000000  
    08-11 18:36:29.193: I/DEBUG(30):     5ca01700  00000000  
    08-11 18:36:29.193: I/DEBUG(30):     5ca01704  00000000  
    08-11 18:36:29.193: I/DEBUG(30):     5ca01708  00000000  
    08-11 18:36:29.193: I/DEBUG(30):     5ca0170c  00000000  
    08-11 18:36:29.193: I/DEBUG(30):     5ca01710  00000000  
    08-11 18:36:29.193: I/DEBUG(30):     5ca01714  00000000  
    08-11 18:36:29.193: I/DEBUG(30):     5ca01718  00000000  
    08-11 18:36:29.193: I/DEBUG(30):     5ca0171c  00000000  
    08-11 18:36:29.203: I/DEBUG(30):     5ca01720  00000000  
    08-11 18:36:29.203: I/DEBUG(30):     5ca01724  00000000  
    08-11 18:36:29.203: I/DEBUG(30):     5ca01728  00000000  
    08-11 18:36:29.203: I/DEBUG(30):     5ca0172c  00000000  
    08-11 18:36:29.203: I/DEBUG(30):     5ca01730  df002777  
    08-11 18:36:29.203: I/DEBUG(30):     5ca01734  e3a070ad  
    08-11 18:36:29.203: I/DEBUG(30):     5ca01738  815d9bd0  /data/data/com.myApp/lib/libffmpeg.so
    08-11 18:36:29.203: I/DEBUG(30): #00 5ca0173c  815d9c60  /data/data/com.myApp/lib/libffmpeg.so
    08-11 18:36:29.203: I/DEBUG(30):     5ca01740  815d9bd0  /data/data/com.myApp/lib/libffmpeg.so
    08-11 18:36:29.213: I/DEBUG(30):     5ca01744  8094b9c4  /data/data/com.myApp/lib/mycustomlib.so
    08-11 18:36:29.213: I/DEBUG(30):     5ca01748  afd489b0  
    08-11 18:36:29.213: I/DEBUG(30):     5ca0174c  00100000  [heap]
    08-11 18:36:29.213: I/DEBUG(30):     5ca01750  5c902000  
    08-11 18:36:29.213: I/DEBUG(30):     5ca01754  812d6404  /data/data/com.myApp/lib/libffmpeg.so
    08-11 18:36:29.213: I/DEBUG(30):     5ca01758  815d0c00  /data/data/com.myApp/lib/libffmpeg.so
    08-11 18:36:29.213: I/DEBUG(30):     5ca0175c  80952dec  /data/data/com.myApp/lib/mycustomlib.so
    08-11 18:36:29.213: I/DEBUG(30):     5ca01760  8094b9c4  /data/data/com.myApp/lib/mycustomlib.so
    08-11 18:36:29.213: I/DEBUG(30):     5ca01764  8107b964  /data/data/com.myApp/lib/libffmpeg.so
    08-11 18:36:29.213: I/DEBUG(30):     5ca01768  0022c928  [heap]
    08-11 18:36:29.213: I/DEBUG(30):     5ca0176c  8090da63  /data/data/com.myApp/lib/mycustomlib.so
    08-11 18:36:29.213: I/DEBUG(30):     5ca01770  00000000  
    08-11 18:36:29.213: I/DEBUG(30):     5ca01774  00000000  
    08-11 18:36:29.213: I/DEBUG(30):     5ca01778  00000000  
    08-11 18:36:29.224: I/DEBUG(30):     5ca0177c  00000000  
    08-11 18:36:29.224: I/DEBUG(30):     5ca01780  80953024  /data/data/com.myApp/lib/mycustomlib.so

  • mp4 video plays from beginning while seeking to another time [on hold]

    13 août 2013, par user2649860

    i am using lighttpd and h264 with jwplayer. I am trying to stream the MP4 video.

    My problem is that the MP4 video downloads whole file before playing and i have another problem i.e. when i seek to another time/point the video plays from beginning and it plays after the end time also.

    i have already tried the ffmpeg tools to create the h264 video and qt-faststart.exe tool to fix the video index problem of the video. But it does not work.

    Any solution ?? THanks in advanced

  • FFmpeg missing frame after H264/TS to RAW/AVI

    13 août 2013, par alexbuisson

    While converting a H263/TS to a RAW/AVI with

    ffmpeg -i in.ts -vcodec rawvideo -pix_fmt yuv420p out.avi

    I found that the output AVI file had less frame than expected. It may come from PTS error in the TS, but if I convert it first to MP4 using the -vcodec copy option, I don't lost frame while performing MP4 to RAW/AVI.

    Is there a solution to ignore the PTS to convert directly from TS?

  • FFMPEG How do I render a FLV from multiple PNG while saving the alpha channel ?

    13 août 2013, par Dan K

    I'm using FFMPEG, and when I'm rendering a FLV movie from multiple PNG files. I would like to preserve the png's alpha channel (transparency) in the output FLV file.

    If you could please help me out on this one, I would appreciate it.

    Thanks, Dan.

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