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  • 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(&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 <-- 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 <-- 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 <-- 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 <-- 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 <-- 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 <-- 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 <-- 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 <-- 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 <-- 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 <-- 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

  • 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(&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 <-- 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 <-- 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 <-- 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 <-- 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 <-- 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 <-- 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 <-- 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 <-- 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 <-- 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 <-- 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

  • How do I extract color matrix from MP4 an x264 stream in Media Foundation

    23 août 2016, par Jules

    I am playing a video (mp4 containing x264 encoded video stream) with a custom player using media foundation.

    When I convert the YUV information into RGB I need to account for the color matrix and range used at encode time.

    Some of my videos have this information, I can use MediaInfo.exe or FFMPEG to see that it is present.

    However, for such videos if I look at the relevant Media Foundation properties (Extended Color Information) the properties are not present in the files.

    So, somehow I need to find a way to access the information.

    Media Foundation does provide access to MF_MT_MPEG4_SAMPLE_DESCRIPTION and MF_MT_MPEG_SEQUENCE_HEADER for the video stream but I can’t find descriptions of what these contain.

    I noticed that the MF_MT_MPEG_SEQUENCE_HEADER is much longer for the videos with the information present and this (MPEG Headers Quick Reference) seems to suggest headers might contain the information I need.

    I’m looking for Color Range (limited/full), Color Primaries, Transfer Characteristics and Matrix Coefficients (BT.709 etc).

    I’d greatly appreciate any help finding this information from a Media Foundation video stream.

    Thanks

    Jules

    Update - Sequence Header

    The sequence header appears to be a subset of MPEG4 sample description, though I can’t find anything that indicates what either bits of data actually contains / doesn’t contain specifically.

    The sequence header appears to contain data structured as an MP4 byte stream as described in the H264 Standards Document and includes the VUI (Video Usability Information - Annex E of document) which may then include the colour information I’m interested in.

    Given that it’s a byte stream I need to know where it starts and whether there’s some existing code I could use to decode it.

    In FFMPEG in libavcodec/h264_ps.c there is a function called ff_h264_decode_seq_parameter_set which ends up calling decode_vui_parameters. It seems possible that seq_parameter_set maps to MF_MT_MPEG_SEQUENCE_HEADER and it may be possible to use that code to decode the data.

    If anyone one has any direct experience with decoding this data it would be very useful.

    Thanks again

    Update - Related posts

    I found this How to decode sprop-parameter-sets in a H264 SDP ? and Possible Locations for Sequence/Picture Parameter Set(s) for H.264 Stream which are fairly helpful.

    The sequence header would appear to be Sequence or picture parameter set (pps) and the parameters I want are the VUI extension subset.

    Plus this post H.264 stream structure gives the high level of how the stream data is structured, and the MF_MT_MPEG_SEQUENCE_HEADER appears to start with a NAL 0x00 0x00 0x01 so I’m guessing it is a NAL containing the PPS.

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