CFStringRef profile_level;
SInt32 bit_rate = avctx->bit_rate;
CFNumberRef bit_rate_num;
+ CFBooleanRef has_b_frames_cfbool;
int status;
codec_type = get_cm_codec_type(avctx->codec_id);
return AVERROR(EINVAL);
}
- vtctx->has_b_frames = avctx->has_b_frames || avctx->max_b_frames > 0;
+ vtctx->has_b_frames = avctx->max_b_frames > 0;
if(vtctx->has_b_frames && vtctx->profile == H264_PROF_BASELINE){
av_log(avctx, AV_LOG_WARNING, "Cannot use B-frames with baseline profile. Output will not contain B-frames.\n");
vtctx->has_b_frames = false;
pthread_cond_init(&vtctx->cv_sample_sent, NULL);
vtctx->dts_delta = vtctx->has_b_frames ? -1 : 0;
+ status = VTSessionCopyProperty(vtctx->session,
+ kVTCompressionPropertyKey_AllowFrameReordering,
+ kCFAllocatorDefault,
+ &has_b_frames_cfbool);
+
+ if (!status) {
+ //Some devices don't output B-frames for main profile, even if requested.
+ vtctx->has_b_frames = CFBooleanGetValue(has_b_frames_cfbool);
+ CFRelease(has_b_frames_cfbool);
+ }
+ avctx->has_b_frames = vtctx->has_b_frames;
+
return 0;
}