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vlc-gpu
Commit 8aa1cc92 authored by Ilkka Ollakka's avatar Ilkka Ollakka
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x264: modify code to add preset/tune options and don't set option if it's default 

Float comparisions aren't really nicelooking, but they should work ok.
parent ca986886
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Showing with 103 additions and 64 deletions
NEWS
View file @ 8aa1cc92
...@@ -94,6 +94,7 @@ Encoders: ...@@ -94,6 +94,7 @@ Encoders:
* x264, defaults to crf=23 as x264.exe-does, if bitrate is given, * x264, defaults to crf=23 as x264.exe-does, if bitrate is given,
uses ABR and if qp-value is set uses CQP uses ABR and if qp-value is set uses CQP
* libx264-version 0.76 or higher is required * libx264-version 0.76 or higher is required
* x264 has tune/preset parameters supported
Stream output: Stream output:
* New smem module, streaming to memory * New smem module, streaming to memory
......
modules/codec/x264.c
View file @ 8aa1cc92
...@@ -35,6 +35,7 @@ ...@@ -35,6 +35,7 @@
#include <vlc_codec.h> #include <vlc_codec.h>
#include <vlc_charset.h> #include <vlc_charset.h>
#include <vlc_cpu.h> #include <vlc_cpu.h>
#include <math.h>
#ifdef PTW32_STATIC_LIB #ifdef PTW32_STATIC_LIB
#include <pthread.h> #include <pthread.h>
...@@ -667,6 +668,11 @@ vlc_module_begin () ...@@ -667,6 +668,11 @@ vlc_module_begin ()
add_string( SOUT_CFG_PREFIX "stats", "x264_2pass.log", NULL, STATS_TEXT, add_string( SOUT_CFG_PREFIX "stats", "x264_2pass.log", NULL, STATS_TEXT,
STATS_LONGTEXT, false ) STATS_LONGTEXT, false )
add_string( SOUT_CFG_PREFIX "preset", NULL , NULL, NULL, NULL, false )
change_string_list( x264_preset_names, x264_preset_names, 0 );
add_string( SOUT_CFG_PREFIX "tune", NULL , NULL, NULL, NULL, false )
change_string_list( x264_tune_names, x264_tune_names, 0 );
vlc_module_end () vlc_module_end ()
...@@ -686,7 +692,8 @@ static const char *const ppsz_sout_options[] = { ...@@ -686,7 +692,8 @@ static const char *const ppsz_sout_options[] = {
"sps-id", "ssim", "stats", "subme", "trellis", "sps-id", "ssim", "stats", "subme", "trellis",
"verbose", "vbv-bufsize", "vbv-init", "vbv-maxrate", "weightb", "weightp", "verbose", "vbv-bufsize", "vbv-init", "vbv-maxrate", "weightb", "weightp",
"aq-mode", "aq-strength", "psy-rd", "psy", "profile", "lookahead", "slices", "aq-mode", "aq-strength", "psy-rd", "psy", "profile", "lookahead", "slices",
"slice-max-size", "slice-max-mbs", "intra-refresh", "mbtree", "hrd", NULL "slice-max-size", "slice-max-mbs", "intra-refresh", "mbtree", "hrd",
"tune","preset",NULL
}; };
static block_t *Encode( encoder_t *, picture_t * ); static block_t *Encode( encoder_t *, picture_t * );
...@@ -750,10 +757,21 @@ static int Open ( vlc_object_t *p_this ) ...@@ -750,10 +757,21 @@ static int Open ( vlc_object_t *p_this )
p_sys->psz_stat_name = NULL; p_sys->psz_stat_name = NULL;
x264_param_default( &p_sys->param ); x264_param_default( &p_sys->param );
char *psz_preset = var_GetString( p_enc, SOUT_CFG_PREFIX "preset" );
char *psz_tune = var_GetString( p_enc, SOUT_CFG_PREFIX "tune" );
if( *psz_preset == '\0' )
{
free(psz_preset);
psz_preset = NULL;
}
x264_param_default_preset( &p_sys->param, psz_preset, psz_tune );
free( psz_preset );
free( psz_tune );
p_sys->param.i_width = p_enc->fmt_in.video.i_width; p_sys->param.i_width = p_enc->fmt_in.video.i_width;
p_sys->param.i_height = p_enc->fmt_in.video.i_height; p_sys->param.i_height = p_enc->fmt_in.video.i_height;
p_sys->param.rc.f_qcompress = var_GetFloat( p_enc, SOUT_CFG_PREFIX "qcomp" ); if( fabs(var_GetFloat( p_enc, SOUT_CFG_PREFIX "qcomp" ) - 0.60) > 0.005 )
p_sys->param.rc.f_qcompress = var_GetFloat( p_enc, SOUT_CFG_PREFIX "qcomp" );
/* transcode-default bitrate is 0, /* transcode-default bitrate is 0,
* set more to ABR if user specifies bitrate */ * set more to ABR if user specifies bitrate */
...@@ -817,31 +835,41 @@ static int Open ( vlc_object_t *p_this ) ...@@ -817,31 +835,41 @@ static int Open ( vlc_object_t *p_this )
else if ( i_val ) else if ( i_val )
p_sys->param.rc.i_vbv_max_bitrate = i_val; p_sys->param.rc.i_vbv_max_bitrate = i_val;
p_sys->param.b_cabac = var_GetBool( p_enc, SOUT_CFG_PREFIX "cabac" );
if( !var_GetBool( p_enc, SOUT_CFG_PREFIX "cabac" ) )
p_sys->param.b_cabac = var_GetBool( p_enc, SOUT_CFG_PREFIX "cabac" );
/* disable deblocking when nf (no loop filter) is enabled */ /* disable deblocking when nf (no loop filter) is enabled */
p_sys->param.b_deblocking_filter = !var_GetBool( p_enc, SOUT_CFG_PREFIX "nf" ); if( var_GetBool( p_enc, SOUT_CFG_PREFIX "nf" ) )
p_sys->param.b_deblocking_filter = !var_GetBool( p_enc, SOUT_CFG_PREFIX "nf" );
psz_val = var_GetString( p_enc, SOUT_CFG_PREFIX "deblock" ); psz_val = var_GetString( p_enc, SOUT_CFG_PREFIX "deblock" );
if( psz_val ) if( psz_val )
{ {
char *p = strchr( psz_val, ':' ); if( atoi( psz_val ) != 0 )
p_sys->param.i_deblocking_filter_alphac0 = atoi( psz_val ); {
p_sys->param.i_deblocking_filter_beta = p ? char *p = strchr( psz_val, ':' );
p_sys->param.i_deblocking_filter_alphac0 = atoi( psz_val );
p_sys->param.i_deblocking_filter_beta = p ?
atoi( p+1 ) : p_sys->param.i_deblocking_filter_alphac0; atoi( p+1 ) : p_sys->param.i_deblocking_filter_alphac0;
}
free( psz_val ); free( psz_val );
} }
psz_val = var_GetString( p_enc, SOUT_CFG_PREFIX "psy-rd" ); psz_val = var_GetString( p_enc, SOUT_CFG_PREFIX "psy-rd" );
if( psz_val ) if( psz_val )
{ {
char *p = strchr( psz_val, ':' ); if( us_atof( psz_val ) != 1.0 )
p_sys->param.analyse.f_psy_rd = us_atof( psz_val ); {
p_sys->param.analyse.f_psy_trellis = p ? us_atof( p+1 ) : 0; char *p = strchr( psz_val, ':' );
p_sys->param.analyse.f_psy_rd = us_atof( psz_val );
p_sys->param.analyse.f_psy_trellis = p ? us_atof( p+1 ) : 0;
}
free( psz_val ); free( psz_val );
} }
p_sys->param.analyse.b_psy = var_GetBool( p_enc, SOUT_CFG_PREFIX "psy" ); if( !var_GetBool( p_enc, SOUT_CFG_PREFIX "psy" ) )
p_sys->param.analyse.b_psy = var_GetBool( p_enc, SOUT_CFG_PREFIX "psy" );
psz_val = var_GetString( p_enc, SOUT_CFG_PREFIX "level" ); psz_val = var_GetString( p_enc, SOUT_CFG_PREFIX "level" );
if( psz_val ) if( psz_val )
...@@ -855,12 +883,16 @@ static int Open ( vlc_object_t *p_this ) ...@@ -855,12 +883,16 @@ static int Open ( vlc_object_t *p_this )
} }
p_sys->param.b_interlaced = var_GetBool( p_enc, SOUT_CFG_PREFIX "interlaced" ); p_sys->param.b_interlaced = var_GetBool( p_enc, SOUT_CFG_PREFIX "interlaced" );
p_sys->param.rc.f_ip_factor = var_GetFloat( p_enc, SOUT_CFG_PREFIX "ipratio" ); if( fabs(var_GetFloat( p_enc, SOUT_CFG_PREFIX "ipratio" ) - 1.4) > 0.005 )
p_sys->param.rc.f_pb_factor = var_GetFloat( p_enc, SOUT_CFG_PREFIX "pbratio" ); p_sys->param.rc.f_ip_factor = var_GetFloat( p_enc, SOUT_CFG_PREFIX "ipratio" );
if( fabs(var_GetFloat( p_enc, SOUT_CFG_PREFIX "pbratio" ) - 1.3 ) > 0.005 )
p_sys->param.rc.f_pb_factor = var_GetFloat( p_enc, SOUT_CFG_PREFIX "pbratio" );
p_sys->param.rc.f_complexity_blur = var_GetFloat( p_enc, SOUT_CFG_PREFIX "cplxblur" ); p_sys->param.rc.f_complexity_blur = var_GetFloat( p_enc, SOUT_CFG_PREFIX "cplxblur" );
p_sys->param.rc.f_qblur = var_GetFloat( p_enc, SOUT_CFG_PREFIX "qblur" ); p_sys->param.rc.f_qblur = var_GetFloat( p_enc, SOUT_CFG_PREFIX "qblur" );
p_sys->param.rc.i_aq_mode = var_GetInteger( p_enc, SOUT_CFG_PREFIX "aq-mode" ); if( var_GetInteger( p_enc, SOUT_CFG_PREFIX "aq-mode" ) != X264_AQ_VARIANCE )
p_sys->param.rc.f_aq_strength = var_GetFloat( p_enc, SOUT_CFG_PREFIX "aq-strength" ); p_sys->param.rc.i_aq_mode = var_GetInteger( p_enc, SOUT_CFG_PREFIX "aq-mode" );
if( fabs( var_GetFloat( p_enc, SOUT_CFG_PREFIX "aq-strength" ) - 1.0) > 0.005 )
p_sys->param.rc.f_aq_strength = var_GetFloat( p_enc, SOUT_CFG_PREFIX "aq-strength" );
if( var_GetBool( p_enc, SOUT_CFG_PREFIX "verbose" ) ) if( var_GetBool( p_enc, SOUT_CFG_PREFIX "verbose" ) )
p_sys->param.i_log_level = X264_LOG_DEBUG; p_sys->param.i_log_level = X264_LOG_DEBUG;
...@@ -875,13 +907,13 @@ static int Open ( vlc_object_t *p_this ) ...@@ -875,13 +907,13 @@ static int Open ( vlc_object_t *p_this )
p_sys->param.b_aud = true; p_sys->param.b_aud = true;
i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "keyint" ); i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "keyint" );
if( i_val > 0 ) p_sys->param.i_keyint_max = i_val; if( i_val > 0 && i_val != 250 ) p_sys->param.i_keyint_max = i_val;
i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "min-keyint" ); i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "min-keyint" );
if( i_val > 0 ) p_sys->param.i_keyint_min = i_val; if( i_val > 0 && i_val != 25 ) p_sys->param.i_keyint_min = i_val;
i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "bframes" ); i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "bframes" );
if( i_val >= 0 && i_val <= 16 ) if( i_val >= 0 && i_val <= 16 && i_val != 3 )
p_sys->param.i_bframe = i_val; p_sys->param.i_bframe = i_val;
#if X264_BUILD >= 82 #if X264_BUILD >= 82
...@@ -890,16 +922,15 @@ static int Open ( vlc_object_t *p_this ) ...@@ -890,16 +922,15 @@ static int Open ( vlc_object_t *p_this )
#if X264_BUILD >= 78 #if X264_BUILD >= 78
psz_val = var_GetString( p_enc, SOUT_CFG_PREFIX "bpyramid" ); psz_val = var_GetString( p_enc, SOUT_CFG_PREFIX "bpyramid" );
p_sys->param.i_bframe_pyramid = X264_B_PYRAMID_NONE; if( strcmp( psz_val, "none" ) )
if( !strcmp( psz_val, "none" ) )
{
p_sys->param.i_bframe_pyramid = X264_B_PYRAMID_NONE;
} else if ( !strcmp( psz_val, "strict" ) )
{ {
p_sys->param.i_bframe_pyramid = X264_B_PYRAMID_STRICT; if ( !strcmp( psz_val, "strict" ) )
} else if ( !strcmp( psz_val, "normal" ) ) {
{ p_sys->param.i_bframe_pyramid = X264_B_PYRAMID_STRICT;
p_sys->param.i_bframe_pyramid = X264_B_PYRAMID_NORMAL; } else if ( !strcmp( psz_val, "normal" ) )
{
p_sys->param.i_bframe_pyramid = X264_B_PYRAMID_NORMAL;
}
} }
free( psz_val ); free( psz_val );
#else #else
...@@ -907,18 +938,18 @@ static int Open ( vlc_object_t *p_this ) ...@@ -907,18 +938,18 @@ static int Open ( vlc_object_t *p_this )
#endif #endif
i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "ref" ); i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "ref" );
if( i_val > 0 && i_val <= 15 ) if( i_val > 0 && i_val <= 15 && i_val != 3 )
p_sys->param.i_frame_reference = i_val; p_sys->param.i_frame_reference = i_val;
i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "scenecut" ); i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "scenecut" );
if( i_val >= -1 && i_val <= 100 ) if( i_val >= -1 && i_val <= 100 && i_val != 40 )
p_sys->param.i_scenecut_threshold = i_val; p_sys->param.i_scenecut_threshold = i_val;
p_sys->param.b_deterministic = var_GetBool( p_enc, p_sys->param.b_deterministic = var_GetBool( p_enc,
SOUT_CFG_PREFIX "non-deterministic" ); SOUT_CFG_PREFIX "non-deterministic" );
i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "subme" ); i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "subme" );
if( i_val >= 1 ) if( i_val >= 1 && i_val != 7 )
p_sys->param.analyse.i_subpel_refine = i_val; p_sys->param.analyse.i_subpel_refine = i_val;
#if X264_BUILD >= 89 #if X264_BUILD >= 89
...@@ -931,30 +962,29 @@ static int Open ( vlc_object_t *p_this ) ...@@ -931,30 +962,29 @@ static int Open ( vlc_object_t *p_this )
//TODO: psz_val == NULL ? //TODO: psz_val == NULL ?
psz_val = var_GetString( p_enc, SOUT_CFG_PREFIX "me" ); psz_val = var_GetString( p_enc, SOUT_CFG_PREFIX "me" );
if( !strcmp( psz_val, "dia" ) ) if( psz_val && strcmp( psz_val, "hex" ) )
{ {
p_sys->param.analyse.i_me_method = X264_ME_DIA; if( !strcmp( psz_val, "dia" ) )
} {
else if( !strcmp( psz_val, "hex" ) ) p_sys->param.analyse.i_me_method = X264_ME_DIA;
{ }
p_sys->param.analyse.i_me_method = X264_ME_HEX; else if( !strcmp( psz_val, "umh" ) )
} {
else if( !strcmp( psz_val, "umh" ) ) p_sys->param.analyse.i_me_method = X264_ME_UMH;
{ }
p_sys->param.analyse.i_me_method = X264_ME_UMH; else if( !strcmp( psz_val, "esa" ) )
} {
else if( !strcmp( psz_val, "esa" ) ) p_sys->param.analyse.i_me_method = X264_ME_ESA;
{ }
p_sys->param.analyse.i_me_method = X264_ME_ESA; else if( !strcmp( psz_val, "tesa" ) )
} {
else if( !strcmp( psz_val, "tesa" ) ) p_sys->param.analyse.i_me_method = X264_ME_TESA;
{ }
p_sys->param.analyse.i_me_method = X264_ME_TESA; free( psz_val );
} }
free( psz_val );
i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "merange" ); i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "merange" );
if( i_val >= 0 && i_val <= 64 ) if( i_val >= 0 && i_val <= 64 && i_val != 16 )
p_sys->param.analyse.i_me_range = i_val; p_sys->param.analyse.i_me_range = i_val;
p_sys->param.analyse.i_mv_range = var_GetInteger( p_enc, p_sys->param.analyse.i_mv_range = var_GetInteger( p_enc,
...@@ -983,45 +1013,51 @@ static int Open ( vlc_object_t *p_this ) ...@@ -983,45 +1013,51 @@ static int Open ( vlc_object_t *p_this )
p_sys->param.analyse.b_psnr = var_GetBool( p_enc, SOUT_CFG_PREFIX "psnr" ); p_sys->param.analyse.b_psnr = var_GetBool( p_enc, SOUT_CFG_PREFIX "psnr" );
p_sys->param.analyse.b_ssim = var_GetBool( p_enc, SOUT_CFG_PREFIX "ssim" ); p_sys->param.analyse.b_ssim = var_GetBool( p_enc, SOUT_CFG_PREFIX "ssim" );
p_sys->param.analyse.b_weighted_bipred = var_GetBool( p_enc, if( !var_GetBool( p_enc, SOUT_CFG_PREFIX "weightb" ) )
p_sys->param.analyse.b_weighted_bipred = var_GetBool( p_enc,
SOUT_CFG_PREFIX "weightb" ); SOUT_CFG_PREFIX "weightb" );
#if X264_BUILD >= 79 #if X264_BUILD >= 79
p_sys->param.analyse.i_weighted_pred = var_GetInteger( p_enc, SOUT_CFG_PREFIX "weightp" ); if( var_GetInteger( p_enc, SOUT_CFG_PREFIX "weightp" ) != 2 )
p_sys->param.analyse.i_weighted_pred = var_GetInteger( p_enc, SOUT_CFG_PREFIX "weightp" );
#endif #endif
p_sys->param.i_bframe_adaptive = var_GetInteger( p_enc, i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "b-adapt" );
SOUT_CFG_PREFIX "b-adapt" ); if( i_val != 1 )
p_sys->param.i_bframe_adaptive = i_val;
i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "b-bias" ); i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "b-bias" );
if( i_val >= -100 && i_val <= 100 ) if( i_val >= -100 && i_val <= 100 && i_val != 0)
p_sys->param.i_bframe_bias = i_val; p_sys->param.i_bframe_bias = i_val;
p_sys->param.analyse.b_chroma_me = var_GetBool( p_enc, p_sys->param.analyse.b_chroma_me = var_GetBool( p_enc,
SOUT_CFG_PREFIX "chroma-me" ); SOUT_CFG_PREFIX "chroma-me" );
p_sys->param.analyse.i_chroma_qp_offset = var_GetInteger( p_enc, p_sys->param.analyse.i_chroma_qp_offset = var_GetInteger( p_enc,
SOUT_CFG_PREFIX "chroma-qp-offset" ); SOUT_CFG_PREFIX "chroma-qp-offset" );
p_sys->param.analyse.b_mixed_references = var_GetBool( p_enc, if( !var_GetBool( p_enc, SOUT_CFG_PREFIX "mixed-refs" ) )
p_sys->param.analyse.b_mixed_references = var_GetBool( p_enc,
SOUT_CFG_PREFIX "mixed-refs" ); SOUT_CFG_PREFIX "mixed-refs" );
i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "trellis" ); i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "trellis" );
if( i_val >= 0 && i_val <= 2 ) if( i_val >= 0 && i_val <= 2 && i_val != 1 )
p_sys->param.analyse.i_trellis = i_val; p_sys->param.analyse.i_trellis = i_val;
p_sys->param.analyse.b_fast_pskip = var_GetBool( p_enc, if( !var_GetBool( p_enc, SOUT_CFG_PREFIX "fast-pskip" ) )
p_sys->param.analyse.b_fast_pskip = var_GetBool( p_enc,
SOUT_CFG_PREFIX "fast-pskip" ); SOUT_CFG_PREFIX "fast-pskip" );
i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "nr" ); i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "nr" );
if( i_val >= 0 && i_val <= 1000 ) if( i_val > 0 && i_val <= 1000 )
p_sys->param.analyse.i_noise_reduction = i_val; p_sys->param.analyse.i_noise_reduction = i_val;
p_sys->param.analyse.b_dct_decimate = var_GetBool( p_enc, if( !var_GetBool( p_enc, SOUT_CFG_PREFIX "dct-decimate" ) )
p_sys->param.analyse.b_dct_decimate = var_GetBool( p_enc,
SOUT_CFG_PREFIX "dct-decimate" ); SOUT_CFG_PREFIX "dct-decimate" );
i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "deadzone-inter" ); i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "deadzone-inter" );
if( i_val >= 0 && i_val <= 32 ) if( i_val >= 0 && i_val <= 32 && i_val != 21 )
p_sys->param.analyse.i_luma_deadzone[0] = i_val; p_sys->param.analyse.i_luma_deadzone[0] = i_val;
i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "deadzone-intra" ); i_val = var_GetInteger( p_enc, SOUT_CFG_PREFIX "deadzone-intra" );
if( i_val >= 0 && i_val <= 32 ) if( i_val >= 0 && i_val <= 32 && i_val != 11)
p_sys->param.analyse.i_luma_deadzone[1] = i_val; p_sys->param.analyse.i_luma_deadzone[1] = i_val;
if( !var_GetBool( p_enc, SOUT_CFG_PREFIX "asm" ) ) if( !var_GetBool( p_enc, SOUT_CFG_PREFIX "asm" ) )
...@@ -1064,7 +1100,8 @@ static int Open ( vlc_object_t *p_this ) ...@@ -1064,7 +1100,8 @@ static int Open ( vlc_object_t *p_this )
} }
free( psz_val ); free( psz_val );
p_sys->param.analyse.b_transform_8x8 = var_GetBool( p_enc, if( var_GetBool( p_enc, SOUT_CFG_PREFIX "8x8dct" ) )
p_sys->param.analyse.b_transform_8x8 = var_GetBool( p_enc,
SOUT_CFG_PREFIX "8x8dct" ); SOUT_CFG_PREFIX "8x8dct" );
if( p_enc->fmt_in.video.i_sar_num > 0 && if( p_enc->fmt_in.video.i_sar_num > 0 &&
...@@ -1178,7 +1215,8 @@ static int Open ( vlc_object_t *p_this ) ...@@ -1178,7 +1215,8 @@ static int Open ( vlc_object_t *p_this )
p_sys->param.rc.b_stat_read = i_val & 2; p_sys->param.rc.b_stat_read = i_val & 2;
} }
p_sys->param.rc.b_mb_tree = var_GetBool( p_enc, SOUT_CFG_PREFIX "mbtree" ); if( !var_GetBool( p_enc, SOUT_CFG_PREFIX "mbtree" ) )
p_sys->param.rc.b_mb_tree = var_GetBool( p_enc, SOUT_CFG_PREFIX "mbtree" );
/* We need to initialize pthreadw32 before we open the encoder, /* We need to initialize pthreadw32 before we open the encoder,
but only once for the whole application. Since pthreadw32 but only once for the whole application. Since pthreadw32
......
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