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  • libavcodec/libx264 do not produce B-frames

    6 novembre 2013, par Rob Schmidt

    I am writing an application in C++ that uses libavcodec with libx264 to encode video. However, the encoded data ended up being much larger than I expected. I analyzed the results and discovered that my encoding never produced B-frames, only I- and P-frames.

    I created a standalone utility based on the ffmpeg source code and examples to test my encoder setup. It reads in an H.264 file, re-encodes the decoded frames, and outputs the result to a file using the ITU H.264 Annex B format. I also used ffmpeg to perform the same operation so I could compare against a known good implementation. My utility never outputs B-frames whereas ffmpeg does.

    I have since tried to figure out what ffmpeg does that my code doesn't. I first tried manually specifying encoder settings related to B-frames. This had no effect.

    I then tried running both ffmpeg and my utility under gdb and comparing the contents of the AVStream, AVCodecContext, and X264Context prior to opening the encoder and manually setting any fields that appeared different. Even with identical settings, I still only produce I- and P-frames.

    Finally, I thought that perhaps the problem was with my timestamp handling. I reworked my test utility to mimic the pipeline used by ffmpeg and to output timestamp debugging output like ffmpeg does. Even with my timestamps identical to ffmpeg's I still get no B-frames.

    At this point I don't know what else to try. When I run ffmpeg, I run it with the command line below. Note that aside from the "superfast" preset, I pretty much use the default values.

    ffmpeg -v debug -i ~/annexb.264 -codec:v libx264 -preset superfast -g 30 -f h264 ./out.264

    The code that configures the encoder is listed below. It specifies the "superfast" preset too.

    static AVStream *add_video_stream(AVFormatContext *output_ctx, AVCodec **output_codec, enum AVCodecID codec_id)
    
{
    
    *output_codec = avcodec_find_encoder(codec_id);
    
    if (*output_codec == NULL) {
    
        printf("Could not find encoder for '%s' (%d)\n", avcodec_get_name(codec_id), codec_id);
    
        return NULL;
    
    }
    

    
    AVStream *output_stream = avformat_new_stream(output_ctx, *output_codec);
    
    if (output_stream == NULL) {
    
        printf("Could not create video stream.\n");
    
        return NULL;
    
    }
    
    output_stream->id = output_ctx->nb_streams - 1;
    
    AVCodecContext *codec_ctx = output_stream->codec;
    

    
    avcodec_get_context_defaults3(codec_ctx, *output_codec);
    

    
    codec_ctx->width = 1280;
    
    codec_ctx->height = 720;
    

    
    codec_ctx->time_base.den = 15000;
    
    codec_ctx->time_base.num = 1001;
    

    
/*    codec_ctx->gop_size = 30;*/
    
    codec_ctx->pix_fmt = AV_PIX_FMT_YUVJ420P;
    

    
    // try to force B-frame output
    
/*    codec_ctx->max_b_frames = 3;*/
    
/*    codec_ctx->b_frame_strategy = 2;*/
    

    
    output_stream->sample_aspect_ratio.num = 1;
    
    output_stream->sample_aspect_ratio.den = 1;
    

    
    codec_ctx->sample_aspect_ratio.num = 1;
    
    codec_ctx->sample_aspect_ratio.den = 1;
    

    
    codec_ctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
    

    
    codec_ctx->bits_per_raw_sample = 8;
    

    
    if ((output_ctx->oformat->flags & AVFMT_GLOBALHEADER) != 0) {
    
        codec_ctx->flags |= CODEC_FLAG_GLOBAL_HEADER;
    
    }
    

    
    return output_stream;
    
}
    

    

    
int main(int argc, char **argv)
    
{
    
    // ... open input file 
    

    
    avformat_alloc_output_context2(&output_ctx, NULL, "h264", output_path);
    
    if (output_ctx == NULL) {
    
        fprintf(stderr, "Unable to allocate output context.\n");
    
        return 1;
    
    } 
    

    
    AVCodec *output_codec = NULL;
    
    output_stream = add_video_stream(output_ctx, &output_codec, output_ctx->oformat->video_codec);
    
    if (output_stream == NULL) {
    
        fprintf(stderr, "Error adding video stream to output context.\n");
    
        return 1;
    
    }
    
    encode_ctx = output_stream->codec;
    

    
    // seems to have no effect
    
#if 0
    
    if (decode_ctx->extradata_size != 0) {
    
        size_t extradata_size = decode_ctx->extradata_size;
    
        printf("extradata_size: %zu\n", extradata_size);
    
        encode_ctx->extradata = av_mallocz(extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
    
        memcpy(encode_ctx->extradata, decode_ctx->extradata, extradata_size);
    
        encode_ctx->extradata_size = extradata_size;
    
    }
    
#endif // 0
    

    
    AVDictionary *opts = NULL;
    
    av_dict_set(&opts, "preset", "superfast", 0);
    
    // av_dict_set(&opts, "threads", "auto", 0); // seems to have no effect
    

    
    ret = avcodec_open2(encode_ctx, output_codec, &opts);
    
    if (ret < 0) {
    
        fprintf(stderr, "Unable to open output video cocec: %s\n", av_err2str(ret));
    
        return 1;
    
    }
    

    
    // ... decoding/encoding loop, clean up, etc.
    

    
    return 0;
    
}

    My test utility produces the following debug output in which you can see there are no B-frames produced :

    [libx264 @ 0x1b8c9c0] using mv_range_thread = 56
    
[libx264 @ 0x1b8c9c0] using SAR=1/1
    
[libx264 @ 0x1b8c9c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 0x1b8c9c0] profile High, level 3.1
    
Output #0, h264, to './out.264':
    
    Stream #0:0, 0, 1/90000: Video: h264, yuvj420p, 1280x720 [SAR 1:1 DAR 16:9], 1001/15000, q=-1--1, 90k tbn, 14.99 tbc
    

    
<snip>
    

    
[libx264 @ 0x1b8c9c0] frame=   0 QP=17.22 NAL=3 Slice:I Poc:0   I:3600 P:0    SKIP:0    size=122837 bytes
    
[libx264 @ 0x1b8c9c0] frame=   1 QP=18.03 NAL=2 Slice:P Poc:2   I:411  P:1825 SKIP:1364 size=25863 bytes
    
[libx264 @ 0x1b8c9c0] frame=   2 QP=17.03 NAL=2 Slice:P Poc:4   I:369  P:2159 SKIP:1072 size=37880 bytes
    
[libx264 @ 0x1b8c9c0] frame=   3 QP=16.90 NAL=2 Slice:P Poc:6   I:498  P:2330 SKIP:772  size=50509 bytes
    
[libx264 @ 0x1b8c9c0] frame=   4 QP=16.68 NAL=2 Slice:P Poc:8   I:504  P:2233 SKIP:863  size=50791 bytes
    
[libx264 @ 0x1b8c9c0] frame=   5 QP=16.52 NAL=2 Slice:P Poc:10  I:513  P:2286 SKIP:801  size=51820 bytes
    
[libx264 @ 0x1b8c9c0] frame=   6 QP=16.49 NAL=2 Slice:P Poc:12  I:461  P:2293 SKIP:846  size=51311 bytes
    
[libx264 @ 0x1b8c9c0] frame=   7 QP=16.65 NAL=2 Slice:P Poc:14  I:476  P:2287 SKIP:837  size=51196 bytes
    
[libx264 @ 0x1b8c9c0] frame=   8 QP=16.66 NAL=2 Slice:P Poc:16  I:508  P:2240 SKIP:852  size=51577 bytes
    
[libx264 @ 0x1b8c9c0] frame=   9 QP=16.55 NAL=2 Slice:P Poc:18  I:477  P:2278 SKIP:845  size=51531 bytes
    
[libx264 @ 0x1b8c9c0] frame=  10 QP=16.67 NAL=2 Slice:P Poc:20  I:517  P:2233 SKIP:850  size=51946 bytes
    

    
<snip>
    

    
[libx264 @ 0x1b8c9c0] frame I:7     Avg QP:13.71  size:152207
    
[libx264 @ 0x1b8c9c0] frame P:190   Avg QP:16.66  size: 50949
    
[libx264 @ 0x1b8c9c0] mb I  I16..4: 27.1% 30.8% 42.1%
    
[libx264 @ 0x1b8c9c0] mb P  I16..4:  6.8%  6.0%  0.8%  P16..4: 61.8%  0.0%  0.0%  0.0%  0.0%    skip:24.7%
    
[libx264 @ 0x1b8c9c0] 8x8 transform intra:41.2% inter:86.9%
    
[libx264 @ 0x1b8c9c0] coded y,uvDC,uvAC intra: 92.2% 28.3% 5.4% inter: 50.3% 1.9% 0.0%
    
[libx264 @ 0x1b8c9c0] i16 v,h,dc,p:  7%  7% 77%  8%
    
[libx264 @ 0x1b8c9c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  7% 15% 49%  6%  4%  3%  5%  3%  8%
    
[libx264 @ 0x1b8c9c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 25% 24%  6%  7%  4%  6%  3%  6%
    
[libx264 @ 0x1b8c9c0] i8c dc,h,v,p: 72% 14% 10%  4%
    
[libx264 @ 0x1b8c9c0] Weighted P-Frames: Y:0.0% UV:0.0%
    
[libx264 @ 0x1b8c9c0] kb/s:6539.11
    
</snip></snip>

    ffmpeg, on the other hand, produces the following output that is almost identical but includes B-frames :

    [libx264 @ 0x20b9c40] using mv_range_thread = 56
    
[libx264 @ 0x20b9c40] using SAR=1/1
    
[libx264 @ 0x20b9c40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 0x20b9c40] profile High, level 3.1
    
[h264 @ 0x20b8160] detected 4 logical cores
    
Output #0, h264, to &#39;./out.264&#39;:
    
  Metadata:
    
    encoder         : Lavf54.63.104
    
    Stream #0:0, 0, 1/90000: Video: h264, yuvj420p, 1280x720 [SAR 1:1 DAR 16:9], 1001/15000, q=-1--1, 90k tbn, 14.99 tbc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 -> libx264)
    

    
<snip>
    

    
[libx264 @ 0x20b9c40] frame=   0 QP=17.22 NAL=3 Slice:I Poc:0   I:3600 P:0    SKIP:0    size=122835 bytes
    
[libx264 @ 0x20b9c40] frame=   1 QP=18.75 NAL=2 Slice:P Poc:8   I:984  P:2045 SKIP:571  size=54208 bytes
    
[libx264 @ 0x20b9c40] frame=   2 QP=19.40 NAL=2 Slice:B Poc:4   I:447  P:1581 SKIP:1572 size=24930 bytes
    
[libx264 @ 0x20b9c40] frame=   3 QP=19.78 NAL=0 Slice:B Poc:2   I:199  P:1002 SKIP:2399 size=10717 bytes
    
[libx264 @ 0x20b9c40] frame=   4 QP=20.19 NAL=0 Slice:B Poc:6   I:204  P:1155 SKIP:2241 size=15937 bytes
    
[libx264 @ 0x20b9c40] frame=   5 QP=18.11 NAL=2 Slice:P Poc:16  I:990  P:2221 SKIP:389  size=64240 bytes
    
[libx264 @ 0x20b9c40] frame=   6 QP=19.35 NAL=2 Slice:B Poc:12  I:439  P:1784 SKIP:1377 size=34048 bytes
    
[libx264 @ 0x20b9c40] frame=   7 QP=19.88 NAL=0 Slice:B Poc:10  I:275  P:1035 SKIP:2290 size=16911 bytes
    
[libx264 @ 0x20b9c40] frame=   8 QP=19.91 NAL=0 Slice:B Poc:14  I:257  P:1270 SKIP:2073 size=19172 bytes
    
[libx264 @ 0x20b9c40] frame=   9 QP=17.90 NAL=2 Slice:P Poc:24  I:962  P:2204 SKIP:434  size=67439 bytes
    
[libx264 @ 0x20b9c40] frame=  10 QP=18.84 NAL=2 Slice:B Poc:20  I:474  P:1911 SKIP:1215 size=37742 bytes
    

    
<snip>
    

    
[libx264 @ 0x20b9c40] frame I:7     Avg QP:15.95  size:130124
    
[libx264 @ 0x20b9c40] frame P:52    Avg QP:17.78  size: 64787
    
[libx264 @ 0x20b9c40] frame B:138   Avg QP:19.32  size: 26231
    
[libx264 @ 0x20b9c40] consecutive B-frames:  6.6%  0.0%  0.0% 93.4%
    
[libx264 @ 0x20b9c40] mb I  I16..4: 30.2% 35.2% 34.6%
    
[libx264 @ 0x20b9c40] mb P  I16..4: 13.9% 11.4%  0.3%  P16..4: 60.4%  0.0%  0.0%  0.0%  0.0%    skip:13.9%
    
[libx264 @ 0x20b9c40] mb B  I16..4:  5.7%  3.3%  0.0%  B16..8: 15.8%  0.0%  0.0%  direct:25.7%  skip:49.5%  L0:43.2% L1:37.3% BI:19.5%
    
[libx264 @ 0x20b9c40] 8x8 transform intra:39.4% inter:77.2%
    
[libx264 @ 0x20b9c40] coded y,uvDC,uvAC intra: 90.7% 26.6% 3.0% inter: 34.0% 4.1% 0.0%
    
[libx264 @ 0x20b9c40] i16 v,h,dc,p:  7%  7% 77%  9%
    
[libx264 @ 0x20b9c40] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  7% 16% 51%  5%  4%  3%  5%  3%  7%
    
[libx264 @ 0x20b9c40] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 27% 20%  6%  6%  3%  6%  3%  6%
    
[libx264 @ 0x20b9c40] i8c dc,h,v,p: 71% 15% 11%  3%
    
[libx264 @ 0x20b9c40] Weighted P-Frames: Y:0.0% UV:0.0%
    
[libx264 @ 0x20b9c40] kb/s:4807.16
    
</snip></snip>

    I'm sure I'm missing something simple, but I can't for the life of me see what it is. Any assistance would be greatly appreciated.

  • libavcodec/libx264 do not produce B-frames

    6 novembre 2013, par Rob Schmidt

    I am writing an application in C++ that uses libavcodec with libx264 to encode video. However, the encoded data ended up being much larger than I expected. I analyzed the results and discovered that my encoding never produced B-frames, only I- and P-frames.

    I created a standalone utility based on the ffmpeg source code and examples to test my encoder setup. It reads in an H.264 file, re-encodes the decoded frames, and outputs the result to a file using the ITU H.264 Annex B format. I also used ffmpeg to perform the same operation so I could compare against a known good implementation. My utility never outputs B-frames whereas ffmpeg does.

    I have since tried to figure out what ffmpeg does that my code doesn’t. I first tried manually specifying encoder settings related to B-frames. This had no effect.

    I then tried running both ffmpeg and my utility under gdb and comparing the contents of the AVStream, AVCodecContext, and X264Context prior to opening the encoder and manually setting any fields that appeared different. Even with identical settings, I still only produce I- and P-frames.

    Finally, I thought that perhaps the problem was with my timestamp handling. I reworked my test utility to mimic the pipeline used by ffmpeg and to output timestamp debugging output like ffmpeg does. Even with my timestamps identical to ffmpeg’s I still get no B-frames.

    At this point I don’t know what else to try. When I run ffmpeg, I run it with the command line below. Note that aside from the "superfast" preset, I pretty much use the default values.

    ffmpeg -v debug -i ~/annexb.264 -codec:v libx264 -preset superfast -g 30 -f h264 ./out.264

    The code that configures the encoder is listed below. It specifies the "superfast" preset too.

    static AVStream *add_video_stream(AVFormatContext *output_ctx, AVCodec **output_codec, enum AVCodecID codec_id)
    
{
    
    *output_codec = avcodec_find_encoder(codec_id);
    
    if (*output_codec == NULL) {
    
        printf("Could not find encoder for '%s' (%d)\n", avcodec_get_name(codec_id), codec_id);
    
        return NULL;
    
    }
    

    
    AVStream *output_stream = avformat_new_stream(output_ctx, *output_codec);
    
    if (output_stream == NULL) {
    
        printf("Could not create video stream.\n");
    
        return NULL;
    
    }
    
    output_stream->id = output_ctx->nb_streams - 1;
    
    AVCodecContext *codec_ctx = output_stream->codec;
    

    
    avcodec_get_context_defaults3(codec_ctx, *output_codec);
    

    
    codec_ctx->width = 1280;
    
    codec_ctx->height = 720;
    

    
    codec_ctx->time_base.den = 15000;
    
    codec_ctx->time_base.num = 1001;
    

    
/*    codec_ctx->gop_size = 30;*/
    
    codec_ctx->pix_fmt = AV_PIX_FMT_YUVJ420P;
    

    
    // try to force B-frame output
    
/*    codec_ctx->max_b_frames = 3;*/
    
/*    codec_ctx->b_frame_strategy = 2;*/
    

    
    output_stream->sample_aspect_ratio.num = 1;
    
    output_stream->sample_aspect_ratio.den = 1;
    

    
    codec_ctx->sample_aspect_ratio.num = 1;
    
    codec_ctx->sample_aspect_ratio.den = 1;
    

    
    codec_ctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
    

    
    codec_ctx->bits_per_raw_sample = 8;
    

    
    if ((output_ctx->oformat->flags &amp; AVFMT_GLOBALHEADER) != 0) {
    
        codec_ctx->flags |= CODEC_FLAG_GLOBAL_HEADER;
    
    }
    

    
    return output_stream;
    
}
    

    

    
int main(int argc, char **argv)
    
{
    
    // ... open input file 
    

    
    avformat_alloc_output_context2(&amp;output_ctx, NULL, "h264", output_path);
    
    if (output_ctx == NULL) {
    
        fprintf(stderr, "Unable to allocate output context.\n");
    
        return 1;
    
    } 
    

    
    AVCodec *output_codec = NULL;
    
    output_stream = add_video_stream(output_ctx, &amp;output_codec, output_ctx->oformat->video_codec);
    
    if (output_stream == NULL) {
    
        fprintf(stderr, "Error adding video stream to output context.\n");
    
        return 1;
    
    }
    
    encode_ctx = output_stream->codec;
    

    
    // seems to have no effect
    
#if 0
    
    if (decode_ctx->extradata_size != 0) {
    
        size_t extradata_size = decode_ctx->extradata_size;
    
        printf("extradata_size: %zu\n", extradata_size);
    
        encode_ctx->extradata = av_mallocz(extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
    
        memcpy(encode_ctx->extradata, decode_ctx->extradata, extradata_size);
    
        encode_ctx->extradata_size = extradata_size;
    
    }
    
#endif // 0
    

    
    AVDictionary *opts = NULL;
    
    av_dict_set(&amp;opts, "preset", "superfast", 0);
    
    // av_dict_set(&amp;opts, "threads", "auto", 0); // seems to have no effect
    

    
    ret = avcodec_open2(encode_ctx, output_codec, &amp;opts);
    
    if (ret &lt; 0) {
    
        fprintf(stderr, "Unable to open output video cocec: %s\n", av_err2str(ret));
    
        return 1;
    
    }
    

    
    // ... decoding/encoding loop, clean up, etc.
    

    
    return 0;
    
}

    My test utility produces the following debug output in which you can see there are no B-frames produced :

    [libx264 @ 0x1b8c9c0] using mv_range_thread = 56
    
[libx264 @ 0x1b8c9c0] using SAR=1/1
    
[libx264 @ 0x1b8c9c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 0x1b8c9c0] profile High, level 3.1
    
Output #0, h264, to './out.264':
    
    Stream #0:0, 0, 1/90000: Video: h264, yuvj420p, 1280x720 [SAR 1:1 DAR 16:9], 1001/15000, q=-1--1, 90k tbn, 14.99 tbc
    

    
<snip>
    

    
[libx264 @ 0x1b8c9c0] frame=   0 QP=17.22 NAL=3 Slice:I Poc:0   I:3600 P:0    SKIP:0    size=122837 bytes
    
[libx264 @ 0x1b8c9c0] frame=   1 QP=18.03 NAL=2 Slice:P Poc:2   I:411  P:1825 SKIP:1364 size=25863 bytes
    
[libx264 @ 0x1b8c9c0] frame=   2 QP=17.03 NAL=2 Slice:P Poc:4   I:369  P:2159 SKIP:1072 size=37880 bytes
    
[libx264 @ 0x1b8c9c0] frame=   3 QP=16.90 NAL=2 Slice:P Poc:6   I:498  P:2330 SKIP:772  size=50509 bytes
    
[libx264 @ 0x1b8c9c0] frame=   4 QP=16.68 NAL=2 Slice:P Poc:8   I:504  P:2233 SKIP:863  size=50791 bytes
    
[libx264 @ 0x1b8c9c0] frame=   5 QP=16.52 NAL=2 Slice:P Poc:10  I:513  P:2286 SKIP:801  size=51820 bytes
    
[libx264 @ 0x1b8c9c0] frame=   6 QP=16.49 NAL=2 Slice:P Poc:12  I:461  P:2293 SKIP:846  size=51311 bytes
    
[libx264 @ 0x1b8c9c0] frame=   7 QP=16.65 NAL=2 Slice:P Poc:14  I:476  P:2287 SKIP:837  size=51196 bytes
    
[libx264 @ 0x1b8c9c0] frame=   8 QP=16.66 NAL=2 Slice:P Poc:16  I:508  P:2240 SKIP:852  size=51577 bytes
    
[libx264 @ 0x1b8c9c0] frame=   9 QP=16.55 NAL=2 Slice:P Poc:18  I:477  P:2278 SKIP:845  size=51531 bytes
    
[libx264 @ 0x1b8c9c0] frame=  10 QP=16.67 NAL=2 Slice:P Poc:20  I:517  P:2233 SKIP:850  size=51946 bytes
    

    
<snip>
    

    
[libx264 @ 0x1b8c9c0] frame I:7     Avg QP:13.71  size:152207
    
[libx264 @ 0x1b8c9c0] frame P:190   Avg QP:16.66  size: 50949
    
[libx264 @ 0x1b8c9c0] mb I  I16..4: 27.1% 30.8% 42.1%
    
[libx264 @ 0x1b8c9c0] mb P  I16..4:  6.8%  6.0%  0.8%  P16..4: 61.8%  0.0%  0.0%  0.0%  0.0%    skip:24.7%
    
[libx264 @ 0x1b8c9c0] 8x8 transform intra:41.2% inter:86.9%
    
[libx264 @ 0x1b8c9c0] coded y,uvDC,uvAC intra: 92.2% 28.3% 5.4% inter: 50.3% 1.9% 0.0%
    
[libx264 @ 0x1b8c9c0] i16 v,h,dc,p:  7%  7% 77%  8%
    
[libx264 @ 0x1b8c9c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  7% 15% 49%  6%  4%  3%  5%  3%  8%
    
[libx264 @ 0x1b8c9c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 25% 24%  6%  7%  4%  6%  3%  6%
    
[libx264 @ 0x1b8c9c0] i8c dc,h,v,p: 72% 14% 10%  4%
    
[libx264 @ 0x1b8c9c0] Weighted P-Frames: Y:0.0% UV:0.0%
    
[libx264 @ 0x1b8c9c0] kb/s:6539.11
    
</snip></snip>

    ffmpeg, on the other hand, produces the following output that is almost identical but includes B-frames :

    [libx264 @ 0x20b9c40] using mv_range_thread = 56
    
[libx264 @ 0x20b9c40] using SAR=1/1
    
[libx264 @ 0x20b9c40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 0x20b9c40] profile High, level 3.1
    
[h264 @ 0x20b8160] detected 4 logical cores
    
Output #0, h264, to './out.264':
    
  Metadata:
    
    encoder         : Lavf54.63.104
    
    Stream #0:0, 0, 1/90000: Video: h264, yuvj420p, 1280x720 [SAR 1:1 DAR 16:9], 1001/15000, q=-1--1, 90k tbn, 14.99 tbc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 -> libx264)
    

    
<snip>
    

    
[libx264 @ 0x20b9c40] frame=   0 QP=17.22 NAL=3 Slice:I Poc:0   I:3600 P:0    SKIP:0    size=122835 bytes
    
[libx264 @ 0x20b9c40] frame=   1 QP=18.75 NAL=2 Slice:P Poc:8   I:984  P:2045 SKIP:571  size=54208 bytes
    
[libx264 @ 0x20b9c40] frame=   2 QP=19.40 NAL=2 Slice:B Poc:4   I:447  P:1581 SKIP:1572 size=24930 bytes
    
[libx264 @ 0x20b9c40] frame=   3 QP=19.78 NAL=0 Slice:B Poc:2   I:199  P:1002 SKIP:2399 size=10717 bytes
    
[libx264 @ 0x20b9c40] frame=   4 QP=20.19 NAL=0 Slice:B Poc:6   I:204  P:1155 SKIP:2241 size=15937 bytes
    
[libx264 @ 0x20b9c40] frame=   5 QP=18.11 NAL=2 Slice:P Poc:16  I:990  P:2221 SKIP:389  size=64240 bytes
    
[libx264 @ 0x20b9c40] frame=   6 QP=19.35 NAL=2 Slice:B Poc:12  I:439  P:1784 SKIP:1377 size=34048 bytes
    
[libx264 @ 0x20b9c40] frame=   7 QP=19.88 NAL=0 Slice:B Poc:10  I:275  P:1035 SKIP:2290 size=16911 bytes
    
[libx264 @ 0x20b9c40] frame=   8 QP=19.91 NAL=0 Slice:B Poc:14  I:257  P:1270 SKIP:2073 size=19172 bytes
    
[libx264 @ 0x20b9c40] frame=   9 QP=17.90 NAL=2 Slice:P Poc:24  I:962  P:2204 SKIP:434  size=67439 bytes
    
[libx264 @ 0x20b9c40] frame=  10 QP=18.84 NAL=2 Slice:B Poc:20  I:474  P:1911 SKIP:1215 size=37742 bytes
    

    
<snip>
    

    
[libx264 @ 0x20b9c40] frame I:7     Avg QP:15.95  size:130124
    
[libx264 @ 0x20b9c40] frame P:52    Avg QP:17.78  size: 64787
    
[libx264 @ 0x20b9c40] frame B:138   Avg QP:19.32  size: 26231
    
[libx264 @ 0x20b9c40] consecutive B-frames:  6.6%  0.0%  0.0% 93.4%
    
[libx264 @ 0x20b9c40] mb I  I16..4: 30.2% 35.2% 34.6%
    
[libx264 @ 0x20b9c40] mb P  I16..4: 13.9% 11.4%  0.3%  P16..4: 60.4%  0.0%  0.0%  0.0%  0.0%    skip:13.9%
    
[libx264 @ 0x20b9c40] mb B  I16..4:  5.7%  3.3%  0.0%  B16..8: 15.8%  0.0%  0.0%  direct:25.7%  skip:49.5%  L0:43.2% L1:37.3% BI:19.5%
    
[libx264 @ 0x20b9c40] 8x8 transform intra:39.4% inter:77.2%
    
[libx264 @ 0x20b9c40] coded y,uvDC,uvAC intra: 90.7% 26.6% 3.0% inter: 34.0% 4.1% 0.0%
    
[libx264 @ 0x20b9c40] i16 v,h,dc,p:  7%  7% 77%  9%
    
[libx264 @ 0x20b9c40] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  7% 16% 51%  5%  4%  3%  5%  3%  7%
    
[libx264 @ 0x20b9c40] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 27% 20%  6%  6%  3%  6%  3%  6%
    
[libx264 @ 0x20b9c40] i8c dc,h,v,p: 71% 15% 11%  3%
    
[libx264 @ 0x20b9c40] Weighted P-Frames: Y:0.0% UV:0.0%
    
[libx264 @ 0x20b9c40] kb/s:4807.16
    
</snip></snip>

    I’m sure I’m missing something simple, but I can’t for the life of me see what it is. Any assistance would be greatly appreciated.

  • MediaCodec hardware decoder much slower with different server configuration ?

    19 octobre 2013, par mathieujofis

    I've been using the Android MediaCodec in order to (hardware) decode H.264 frames on my Galaxy S4 coming from a Live 555 RTSP live (real-time) stream. After changing my Live 555 server configuration from using ffmpeg (with x264) to encode frames, to using strictly x264 to encode frames, the time to decode frames with MediaCodec takes much longer. Basically, MediaCodec can't keep up with the stream, and displays the video in slow motion, getting slower and slower as time goes on. Going back to ffmpeg isn't a solution for me, because I need the ability to encode into discrete NAL units, rather than a whole frame like ffmpeg does.

    I was wondering if this was either : A) An issue with the way my server is encoding NAL units, or B) An issue with my Android client, specifically the way it is receiving and decoding NAL units.

    My encoding configuration with x264 is :

    x264_param_default_preset(&amp;param,"ultrafast", "zerolatency:fastdecode");
    
param.i_threads = 1;
    
param.i_bframe = 1;
    
param.i_width = image_width;
    
param.i_height = image_height;
    
param.i_fps_num = 60;
    
param.i_fps_den = 1;
    
param.i_keyint_max = 10;
    

    
param.rc.i_rc_method = X264_RC_ABR;
    
param.rc.i.bitrate = 6000;
    
param.i_sps_id = 7;
    
param.b_repeat_headers = 1;
    
param.b_annexb = 0;

    My Android MediaCodec client is set up as follows :

    I receive each individual NAL unit on a separate Live 555 RTSP client thread. Each NAL is put into a queue along with its size and presentation time. A separate decoder thread grabs NALs from this queue, and if there are none available, waits until there are.

    Some notes :

    What I generally see happen is the queue starts filling up with NALs, instead of staying close to empty. So, I know that the decoder thread is not working fast enough. I don't think this is an inherent problem with decoding on an Android phone (for example, processing limitations) because it does the same thing for very low bitrates— also again, it DID work when I was using ffmpeg to encode. If I omit certain NAL units, the decoder can start to keep up. Since I'm using Cyanogenmod 10.1, bumping up the minimum CPU frequency helps, too.

    Edit :

    Here is a log of the Android client, as well as a log highlighting the garbage collector specifically—

    Entire Logcat :

    10-15 16:40:03.955: D/DecodeActivity(18859): INFO_OUTPUT_BUFFERS_CHANGED
    
10-15 16:40:03.995: E/OMX-VDEC-1080P(288): Sync frame received
    
10-15 16:40:03.995: E/OMX-VDEC-1080P(288):  No color conversion required
    
10-15 16:40:03.995: E/OMX-VDEC-1080P(288): Get_parameter: OMX_IndexParamPortDefinition: nPortIndex (1), nFrameWidth (1280), nFrameHeight (720), nStride (1280), nSliceHeight (736), nBitrate (-1073741824), xFramerate (0x1e), nBufferSize (1433600), nBufferCountMin (4), nBufferCountActual (8), bBuffersContiguous (1918394328), nBufferAlignment (1075643347), bEnabled (1), bPopulated (1), eCompressionFormat (0x0), eColorFormat (0x7fa30c03)
    
10-15 16:40:03.995: D/DecodeActivity(18859): New format {height=720, what=1869968451, color-format=2141391875, slice-height=736, crop-left=0, width=1280, crop-bottom=719, crop-top=0, mime=video/raw, stride=1280, crop-right=1279}
    
10-15 16:40:04.005: E/OMX-VDEC-1080P(288): set_frame_rate: frm_int(4966) fps(201.369308)
    
10-15 16:40:04.015: W/IInputConnectionWrapper(1069): showStatusIcon on inactive InputConnection
    
10-15 16:40:04.025: I/ActivityManager(698): Displayed com.mathieu.alloclient.javadecoder/.MainActivity: +617ms
    
10-15 16:40:04.025: E/OMX-VDEC-1080P(288): set_frame_rate: frm_int(4766) fps(209.819550)
    
10-15 16:40:04.125: E/OMX-VDEC-1080P(288): set_frame_rate: frm_int(4733) fps(211.282486)
    
10-15 16:40:04.445: E/OMX-VDEC-1080P(288): set_frame_rate: frm_int(4711) fps(212.269150)
    
10-15 16:40:04.495: E/OMX-VDEC-1080P(288): set_frame_rate: frm_int(4700) fps(212.765961)
    
10-15 16:40:05.676: E/OMX-VDEC-1080P(288): set_frame_rate: frm_int(4688) fps(213.310577)
    
10-15 16:40:06.087: D/dalvikvm(698): WAIT_FOR_CONCURRENT_GC blocked 1ms
    
10-15 16:40:06.207: D/dalvikvm(698): GC_EXPLICIT freed 4120K, 39% free 24216K/39664K, paused 7ms+9ms, total 117ms
    
10-15 16:40:06.537: D/ALSADevice(288): standby: handle 0x40024450 h 0x0
    
10-15 16:40:06.577: D/alsa_ucm(288): snd_use_case_set(): uc_mgr 0x400fbfb0 identifier _verb value Inactive
    
10-15 16:40:06.577: D/alsa_ucm(288): Set mixer controls for HiFi Lowlatency enable 0
    
10-15 16:40:06.577: D/alsa_ucm(288): Setting mixer control: SLIMBUS_0_RX Audio Mixer MultiMedia5, value: 0
    
10-15 16:40:06.577: D/alsa_ucm(288): snd_use_case_set(): uc_mgr 0x400fbfb0 identifier _disdev value Line
    
10-15 16:40:06.577: D/alsa_ucm(288): disdev: device Line not enabled, no need to disable
    
10-15 16:40:06.577: D/alsa_ucm(288): snd_use_case_set(): uc_mgr 0x400fbfb0 identifier _disdev value Speaker
    
10-15 16:40:06.577: D/alsa_ucm(288): Set mixer controls for Speaker enable 0
    
10-15 16:40:06.577: D/alsa_ucm(288): Setting mixer control: RX5 MIX1 INP1, value: ZERO
    
10-15 16:40:06.587: D/alsa_ucm(288): Setting mixer control: RX5 MIX1 INP2, value: ZERO
    
10-15 16:40:06.587: D/alsa_ucm(288): Setting mixer control: LINEOUT2 Volume, value: 0
    
10-15 16:40:06.587: D/alsa_ucm(288): Setting mixer control: LINEOUT4 Volume, value: 0
    
10-15 16:40:06.587: D/alsa_ucm(288): Setting mixer control: RX5 Digital Volume, value: 0
    
10-15 16:40:06.587: D/AudioUsbALSA(288): exitPlaybackThread, mproxypfdPlayback: -1
    
10-15 16:40:06.587: D/AudioUsbALSA(288): closeDevice handle 0x0
    
10-15 16:40:06.587: D/AudioUsbALSA(288): closeDevice handle 0x0
    
10-15 16:40:17.638: E/OMX-VDEC-1080P(288): set_frame_rate: frm_int(4677) fps(213.812271)
    
10-15 16:40:17.698: E/OMX-VDEC-1080P(288): set_frame_rate: frm_int(4644) fps(215.331604)
    
10-15 16:40:20.681: E/OMX-VDEC-1080P(288): set_frame_rate: frm_int(4633) fps(215.842865)
    
10-15 16:40:21.111: E/OMX-VDEC-1080P(288): set_frame_rate: frm_int(4611) fps(216.872696)
    
10-15 16:40:25.746: D/dalvikvm(698): GC_CONCURRENT freed 5829K, 41% free 23778K/39664K, paused 10ms+24ms, total 165ms
    
10-15 16:40:28.448: E/MP-Decision(1385): num online cores: 4 reqd : 3 available : 4 rq_depth:2.800000 hotplug_avg_load_dw: 74
    
10-15 16:40:28.448: E/MP-Decision(1385): DOWN cpu:3 core_idx:3 Ns:3.100000 Ts:240 total_time_down:243.000000
    
10-15 16:40:30.841: W/SystemClock(698): time going backwards: prev 16555345563411(ioctl) vs now 16555345441341(ioctl), tid=764
    
10-15 16:40:44.684: D/dalvikvm(698): GC_CONCURRENT freed 5302K, 41% free 23774K/39664K, paused 6ms+9ms, total 107ms
    
10-15 16:40:57.467: E/OMX-VDEC-1080P(288): set_frame_rate: frm_int(4577) fps(218.483719)
    
10-15 16:41:14.383: D/dalvikvm(698): GC_CONCURRENT freed 5371K, 41% free 23768K/39664K, paused 7ms+8ms, total 146ms
    
10-15 16:41:14.403: E/MP-Decision(1385): num online cores: 3 reqd : 4 available : 4 rq_depth:4.500000 hotplug_avg_load_dw: 89
    
10-15 16:41:14.403: E/MP-Decision(1385): UP cpu:1 core_idx:1 Nw:1.900000 Tw:140 total_time_up:0.000000
    
10-15 16:41:14.403: E/MP-Decision(1385): UP cpu:2 core_idx:2 Nw:2.700000 Tw:90 total_time_up:0.000000
    
10-15 16:41:14.403: E/MP-Decision(1385): UP cpu:3 core_idx:3 Nw:3.500000 Tw:90 total_time_up:922.000000
    
10-15 16:41:27.466: E/kickstart(862): Total bytes received so far: 48
    
10-15 16:41:27.466: E/kickstart(862): EVENT: RECEIVED &lt;-- SAHARA_HELLO
    
10-15 16:41:27.466: E/kickstart(862): EVENT: SENDING --> SAHARA_HELLO_RESPONSE
    
10-15 16:41:27.466: E/kickstart(862): EVENT: sahara_mode                         = 2
    
10-15 16:41:27.466: E/kickstart(862): EVENT: m_comm->sahara_hello_packet_rx.mode = 2
    
10-15 16:41:27.466: E/kickstart(862): EVENT: helloRx.mode                        = 2
    
10-15 16:41:27.466: E/kickstart(862): Total bytes received so far: 64
    
10-15 16:41:27.466: E/kickstart(862): EVENT: RECEIVED &lt;-- SAHARA_MEMORY_DEBUG
    
10-15 16:41:27.466: E/kickstart(862): Total bytes received so far: 116
    
10-15 16:41:27.466: E/kickstart(862): EVENT: 0x46980000, len=000C0000, "m9kefs1", ""
    
10-15 16:41:27.466: E/kickstart(862): EVENT: STATE &lt;-- SAHARA_WAIT_MEMORY_REGION
    
10-15 16:41:27.466: E/kickstart(862): EVENT: Saving "/dev/block/platform/msm_sdcc.1/by-name/m9kefs1"
    
10-15 16:41:27.526: E/kickstart(862): Total bytes received so far: 786548
    
10-15 16:41:27.526: E/kickstart(862): EVENT: Received: 786432 bytes
    
10-15 16:41:27.526: E/kickstart(862): EVENT: Writing to disk
    
10-15 16:41:27.526: E/kickstart(862): EVENT: Successfully wrote to disk
    
10-15 16:41:27.526: E/kickstart(862): Received file "m9kefs1"
    
10-15 16:41:27.576: E/kickstart(862): Sync finish Received file "m9kefs1"
    
10-15 16:41:27.576: E/kickstart(862): 786432 bytes transferred in 0.106s (7.10 MBps)
    
10-15 16:41:27.576: E/kickstart(862): EVENT: num_debug_entries not >=0
    
10-15 16:41:27.576: E/kickstart(862): Successfully downloaded files from target 
    
10-15 16:41:27.576: E/kickstart(862): EVENT: SENDING --> SAHARA_RESET
    
10-15 16:41:27.576: E/kickstart(862): Total bytes received so far: 786556
    
10-15 16:41:27.576: E/kickstart(862): EVENT: RECEIVED &lt;-- SAHARA_RESET_RESP
    
10-15 16:41:27.576: E/kickstart(862): Sahara protocol completed
    
10-15 16:41:27.576: E/kickstart(862): EVENT: STATE &lt;-- SAHARA_WAIT_HELLO
    
10-15 16:41:27.746: E/MP-Decision(1385): num online cores: 4 reqd : 3 available : 4 rq_depth:2.100000 hotplug_avg_load_dw: 79
    
10-15 16:41:27.746: E/MP-Decision(1385): DOWN cpu:3 core_idx:3 Ns:3.100000 Ts:240 total_time_down:244.000000
    
10-15 16:41:49.598: D/dalvikvm(698): GC_CONCURRENT freed 5339K, 41% free 23775K/39664K, paused 10ms+7ms, total 134ms
    
10-15 16:42:17.225: I/ActivityManager(698): Start proc com.cyanogenmod.lockclock for service com.cyanogenmod.lockclock/.weather.WeatherUpdateService: pid=18954 uid=10028 gids={50028, 3003, 1028}
    
10-15 16:42:17.865: D/WeatherXmlParser(18954): Weather updated: WeatherInfo for Santa Barbara@ Tue Oct 15 16:42:17 PDT 2013: Fair(34), temperature 29°C, low 11°, high 27°, humidity 14%, wind 11km/h at W
    
10-15 16:42:17.945: I/ActivityManager(698): No longer want com.google.android.apps.uploader (pid 13565): empty #17
    
10-15 16:42:24.021: D/dalvikvm(698): GC_CONCURRENT freed 5277K, 41% free 23770K/39664K, paused 8ms+11ms, total 106ms
    
10-15 16:42:35.983: W/ThrottleService(698): unable to find stats for iface rmnet0
    
10-15 16:42:59.476: D/dalvikvm(698): GC_CONCURRENT freed 5345K, 41% free 23770K/39664K, paused 6ms+13ms, total 168ms
    
10-15 16:43:02.098: E/kickstart(862): Total bytes received so far: 48
    
10-15 16:43:02.098: E/kickstart(862): EVENT: RECEIVED &lt;-- SAHARA_HELLO
    
10-15 16:43:02.098: E/kickstart(862): EVENT: SENDING --> SAHARA_HELLO_RESPONSE
    
10-15 16:43:02.098: E/kickstart(862): EVENT: sahara_mode                         = 2
    
10-15 16:43:02.098: E/kickstart(862): EVENT: m_comm->sahara_hello_packet_rx.mode = 2
    
10-15 16:43:02.098: E/kickstart(862): EVENT: helloRx.mode                        = 2
    
10-15 16:43:02.098: E/kickstart(862): Total bytes received so far: 64
    
10-15 16:43:02.098: E/kickstart(862): EVENT: RECEIVED &lt;-- SAHARA_MEMORY_DEBUG
    
10-15 16:43:02.108: E/kickstart(862): Total bytes received so far: 116
    
10-15 16:43:02.108: E/kickstart(862): EVENT: 0x46980000, len=000C0000, "m9kefs2", ""
    
10-15 16:43:02.108: E/kickstart(862): EVENT: STATE &lt;-- SAHARA_WAIT_MEMORY_REGION
    
10-15 16:43:02.108: E/kickstart(862): EVENT: Saving "/dev/block/platform/msm_sdcc.1/by-name/m9kefs2"
    
10-15 16:43:02.158: E/kickstart(862): Total bytes received so far: 786548
    
10-15 16:43:02.158: E/kickstart(862): EVENT: Received: 786432 bytes
    
10-15 16:43:02.158: E/kickstart(862): EVENT: Writing to disk
    
10-15 16:43:02.168: E/kickstart(862): EVENT: Successfully wrote to disk
    
10-15 16:43:02.168: E/kickstart(862): Received file "m9kefs2"
    
10-15 16:43:02.218: E/kickstart(862): Sync finish Received file "m9kefs2"
    
10-15 16:43:02.218: E/kickstart(862): 786432 bytes transferred in 0.113s (6.65 MBps)
    
10-15 16:43:02.218: E/kickstart(862): EVENT: num_debug_entries not >=0
    
10-15 16:43:02.218: E/kickstart(862): Successfully downloaded files from target 
    
10-15 16:43:02.218: E/kickstart(862): EVENT: SENDING --> SAHARA_RESET
    
10-15 16:43:02.218: E/kickstart(862): Total bytes received so far: 786556
    
10-15 16:43:02.218: E/kickstart(862): EVENT: RECEIVED &lt;-- SAHARA_RESET_RESP
    
10-15 16:43:02.218: E/kickstart(862): Sahara protocol completed
    
10-15 16:43:02.218: E/kickstart(862): EVENT: STATE &lt;-- SAHARA_WAIT_HELLO
    
10-15 16:43:17.563: W/SystemClock(698): time going backwards: prev 16722067121029(ioctl) vs now 16722066968441(ioctl), tid=764
    
10-15 16:43:34.610: D/dalvikvm(698): GC_CONCURRENT freed 5359K, 41% free 23772K/39664K, paused 9ms+9ms, total 113ms
    
10-15 16:43:36.452: E/MP-Decision(1385): num online cores: 3 reqd : 4 available : 4 rq_depth:3.900000 hotplug_avg_load_dw: 100
    
10-15 16:43:36.452: E/MP-Decision(1385): UP cpu:1 core_idx:1 Nw:1.900000 Tw:140 total_time_up:0.000000
    
10-15 16:43:36.452: E/MP-Decision(1385): UP cpu:2 core_idx:2 Nw:2.700000 Tw:90 total_time_up:0.000000
    
10-15 16:43:36.452: E/MP-Decision(1385): UP cpu:3 core_idx:3 Nw:3.500000 Tw:90 total_time_up:194.000000
    
10-15 16:44:09.965: D/dalvikvm(698): GC_CONCURRENT freed 5369K, 41% free 23779K/39664K, paused 8ms+8ms, total 103ms
    
10-15 16:44:09.965: D/dalvikvm(698): WAIT_FOR_CONCURRENT_GC blocked 30ms
    
10-15 16:44:10.605: E/MP-Decision(1385): num online cores: 4 reqd : 3 available : 4 rq_depth:2.800000 hotplug_avg_load_dw: 133
    
10-15 16:44:10.605: E/MP-Decision(1385): DOWN cpu:3 core_idx:3 Ns:3.100000 Ts:240 total_time_down:244.000000
    
10-15 16:44:12.707: E/MP-Decision(1385): num online cores: 3 reqd : 4 available : 4 rq_depth:4.100000 hotplug_avg_load_dw: 116
    
10-15 16:44:12.707: E/MP-Decision(1385): UP cpu:1 core_idx:1 Nw:1.900000 Tw:140 total_time_up:0.000000
    
10-15 16:44:12.707: E/MP-Decision(1385): UP cpu:2 core_idx:2 Nw:2.700000 Tw:90 total_time_up:0.000000
    
10-15 16:44:12.707: E/MP-Decision(1385): UP cpu:3 core_idx:3 Nw:3.500000 Tw:90 total_time_up:97.000000
    
10-15 16:44:14.008: E/MP-Decision(1385): num online cores: 4 reqd : 3 available : 4 rq_depth:1.700000 hotplug_avg_load_dw: 140
    
10-15 16:44:14.008: E/MP-Decision(1385): DOWN cpu:3 core_idx:3 Ns:3.100000 Ts:240 total_time_down:240.000000
    
10-15 16:44:14.759: E/MP-Decision(1385): num online cores: 3 reqd : 4 available : 4 rq_depth:4.900000 hotplug_avg_load_dw: 132
    
10-15 16:44:14.759: E/MP-Decision(1385): UP cpu:1 core_idx:1 Nw:1.900000 Tw:140 total_time_up:0.000000
    
10-15 16:44:14.759: E/MP-Decision(1385): UP cpu:2 core_idx:2 Nw:2.700000 Tw:90 total_time_up:0.000000
    
10-15 16:44:14.759: E/MP-Decision(1385): UP cpu:3 core_idx:3 Nw:3.500000 Tw:90 total_time_up:97.000000
    
10-15 16:44:15.360: E/MP-Decision(1385): num online cores: 4 reqd : 3 available : 4 rq_depth:2.300000 hotplug_avg_load_dw: 139
    
10-15 16:44:15.360: E/MP-Decision(1385): DOWN cpu:3 core_idx:3 Ns:3.100000 Ts:240 total_time_down:243.000000
    
10-15 16:44:15.560: E/MP-Decision(1385): num online cores: 3 reqd : 4 available : 4 rq_depth:3.900000 hotplug_avg_load_dw: 133
    
10-15 16:44:15.560: E/MP-Decision(1385): UP cpu:1 core_idx:1 Nw:1.900000 Tw:140 total_time_up:0.000000
    
10-15 16:44:15.560: E/MP-Decision(1385): UP cpu:2 core_idx:2 Nw:2.700000 Tw:90 total_time_up:0.000000
    
10-15 16:44:15.560: E/MP-Decision(1385): UP cpu:3 core_idx:3 Nw:3.500000 Tw:90 total_time_up:95.000000
    
10-15 16:44:16.361: E/MP-Decision(1385): num online cores: 4 reqd : 3 available : 4 rq_depth:2.500000 hotplug_avg_load_dw: 132
    
10-15 16:44:16.361: E/MP-Decision(1385): DOWN cpu:3 core_idx:3 Ns:3.100000 Ts:240 total_time_down:242.000000
    
10-15 16:44:16.661: E/MP-Decision(1385): num online cores: 3 reqd : 4 available : 4 rq_depth:3.700000 hotplug_avg_load_dw: 127
    
10-15 16:44:16.661: E/MP-Decision(1385): UP cpu:1 core_idx:1 Nw:1.900000 Tw:140 total_time_up:0.000000
    
10-15 16:44:16.661: E/MP-Decision(1385): UP cpu:2 core_idx:2 Nw:2.700000 Tw:90 total_time_up:0.000000
    
10-15 16:44:16.661: E/MP-Decision(1385): UP cpu:3 core_idx:3 Nw:3.500000 Tw:90 total_time_up:97.000000
    
10-15 16:44:20.605: E/MP-Decision(1385): num online cores: 4 reqd : 3 available : 4 rq_depth:1.700000 hotplug_avg_load_dw: 122
    
10-15 16:44:20.605: E/MP-Decision(1385): DOWN cpu:3 core_idx:3 Ns:3.100000 Ts:240 total_time_down:244.000000
    
10-15 16:44:20.615: W/ProcessStats(698): Skipping unknown process pid 19038
    
10-15 16:44:20.615: W/ProcessStats(698): Skipping unknown process pid 19041

    Garbage collector entries in Logcat :

    10-15 16:40:06.087: D/dalvikvm(698): WAIT_FOR_CONCURRENT_GC blocked 1ms
    
10-15 16:40:06.207: D/dalvikvm(698): GC_EXPLICIT freed 4120K, 39% free 24216K/39664K,   paused 7ms+9ms, total 117ms
    
10-15 16:40:25.746: D/dalvikvm(698): GC_CONCURRENT freed 5829K, 41% free 23778K/39664K, paused 10ms+24ms, total 165ms
    
10-15 16:40:44.684: D/dalvikvm(698): GC_CONCURRENT freed 5302K, 41% free 23774K/39664K, paused 6ms+9ms, total 107ms
    
10-15 16:41:14.383: D/dalvikvm(698): GC_CONCURRENT freed 5371K, 41% free 23768K/39664K, paused 7ms+8ms, total 146ms
    
10-15 16:41:49.598: D/dalvikvm(698): GC_CONCURRENT freed 5339K, 41% free 23775K/39664K, paused 10ms+7ms, total 134ms
    
10-15 16:42:24.021: D/dalvikvm(698): GC_CONCURRENT freed 5277K, 41% free 23770K/39664K, paused 8ms+11ms, total 106ms
    
10-15 16:42:59.476: D/dalvikvm(698): GC_CONCURRENT freed 5345K, 41% free 23770K/39664K, paused 6ms+13ms, total 168ms
    
10-15 16:43:34.610: D/dalvikvm(698): GC_CONCURRENT freed 5359K, 41% free 23772K/39664K, paused 9ms+9ms, total 113ms
    
10-15 16:44:09.965: D/dalvikvm(698): GC_CONCURRENT freed 5369K, 41% free 23779K/39664K, paused 8ms+8ms, total 103ms
    
10-15 16:44:09.965: D/dalvikvm(698): WAIT_FOR_CONCURRENT_GC blocked 30ms
    
10-15 16:44:24.389: D/dalvikvm(698): GC_EXPLICIT freed 3618K, 41% free 23768K/39664K, paused 12ms+11ms, total 123ms

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