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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

  • Windows again

    24 septembre 2013, par Mikko Koppanen — Imagick

    Seems like the new Windows build system is online and Imagick for Windows is now provided here :

    http://windows.php.net/downloads/pecl/releases/imagick/

  • Re-creating/matching ffmpeg settings

    8 novembre 2013, par Pete Helgren

    I have an MP4 file that plays pretty much on every browser using either HTML5 or flash fallback (using mediaelement.js). I also have a series of additional video files that I would like to have "match" the one file that does play consistently but I haven't been able to match the ffmpeg settings so it produces a like file. I used ffprobe and got the following results on the file that plays successfully :

    ffprobe version N-53616-g7a2edcf Copyright (c) 2007-2013 the FFmpeg developers
    
built on May 29 2013 01:21:08 with gcc 4.7.3 (GCC)
    
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
    
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
    
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
    
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
    
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
    
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
    
eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
    
amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
    
enable-libxvid --enable-zlib
    
 libavutil      52. 34.100 / 52. 34.100
    
 libavcodec     55. 12.102 / 55. 12.102
    
 libavformat    55.  7.100 / 55.  7.100
    
 libavdevice    55.  1.101 / 55.  1.101
    
 libavfilter     3. 72.100 /  3. 72.100
    
 libswscale      2.  3.100 /  2.  3.100
    
 libswresample   0. 17.102 /  0. 17.102
    
 libpostproc    52.  3.100 / 52.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MyFile.mp4':
    
 Metadata:
    
  major_brand     : M4V
    
  minor_version   : 1
    
  compatible_brands: M4V mp42isom
    
  creation_time   : 2013-05-29 16:08:29
    
Duration: 00:01:58.10, start: 0.000000, bitrate: 1155 kb/s
    
 Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 854x480 [SAR 1:1 DAR 427:240], 995 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
    
Metadata:
    
  creation_time   : 2013-05-29 16:08:29
    
  handler_name    : Mainconcept MP4 Video Media Handler
    
Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 157 kb/s
    
Metadata:
    
  creation_time   : 2013-05-29 16:08:29
    
  handler_name    : Mainconcept MP4 Sound Media Handler

    Following a few guides I found online, I am using the following ffmpeg settings :

    ffmpeg -i {input file name} -y -acodec aac -ac 2 -strict experimental -ab 64k -s 320x240 -vcodec libx264 -pix_fmt yuv420p -preset slow -profile:v baseline -level 30 -maxrate 300k -bufsize 600k -b:v 300k -f mp4 -threads 0 -movflags +faststart {output file name}

    That command produces the following output :

    ffmpeg -i "testin.mp4" -y -acodec aac -ac 2 -strict experimental -ab 64k -s 320x240 -vcodec libx264 -pix_fmt yuv420p -preset slow-profile:v baseline -level 30 -maxrate 300k -bufsize 600k -b:v 300k -f mp4 -threads 0 -movflags +faststart testout.mp4
    

    
ffmpeg version N-53616-g7a2edcf Copyright (c) 2000-2013 the FFmpeg developers  built on May 29 2013 01:21:08 with gcc 4.7.3 (GCC)  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
    
  libavutil      52. 34.100 / 52. 34.100
    
  libavcodec     55. 12.102 / 55. 12.102
    
  libavformat    55.  7.100 / 55.  7.100
    
  libavdevice    55.  1.101 / 55.  1.101
    
  libavfilter     3. 72.100 /  3. 72.100
    
  libswscale      2.  3.100 /  2.  3.100
    
  libswresample   0. 17.102 /  0. 17.102
    
  libpostproc    52.  3.100 / 52.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'testin.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42mp41
    
    creation_time   : 2013-10-01 17:11:42
    
  Duration: 00:04:33.75, start: 0.000000, bitrate: 725 kb/s
    
    Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 596 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
    
    Metadata:
    
      creation_time   : 2013-10-01 17:11:42
    
      handler_name    : ?Mainconcept Video Media Handler
    
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 125 kb/s
    
    Metadata:
    
      creation_time   : 2013-10-01 17:11:42
    
      handler_name    : #Mainconcept MP4 Sound Media Handler
    
[libx264 @ 0000000000358160] using SAR=1/1
    
[libx264 @ 0000000000358160] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2AVX
    
[libx264 @ 0000000000358160] profile Constrained Baseline, level 3.0
    
[libx264 @ 0000000000358160] 264 - core 133 r2334 a3ac64b - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=0 ref=5 deblock=1:0:0 analyse=0x1:0x111 me=umh subme=8 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=cbr mbtree=1 bitrate=300 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=300 vbv_bufsize=600 nal_hrd=none ip_ratio=1.40 aq=1:1.00
    

    
Output #0, mp4, to 'testout.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42mp41
    
    encoder         : Lavf55.7.100
    
   Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 320x240 [SAR 1:1 DAR 4:3], q=-1--1, 300 kb/s, 30k tbn, 29.97 tbc
    
    Metadata:
    
      creation_time   : 2013-10-01 17:11:42
    
      handler_name    : ?Mainconcept Video Media Handler
    
    Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 64 kb/s
    
    Metadata:
    
      creation_time   : 2013-10-01 17:11:42
    
      handler_name    : #Mainconcept MP4 Sound Media Handler
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 -> libx264)
    
  Stream #0:1 -> #0:1 (aac -> aac)
    
Press [q] to stop, [?] for help
    
frame=  283 fps=0.0 q=21.0 size=     329kB time=00:00:09.30 bitrate= 289.9kbits/
    
frame=  565 fps=564 q=20.0 size=     760kB time=00:00:18.64 bitrate= 333.7kbits/
    
frame=  846 fps=564 q=21.0 size=    1179kB time=00:00:28.20 bitrate= 342.5kbits/
    
frame= 1123 fps=561 q=22.0 size=    1603kB time=00:00:37.33 bitrate= 351.7kbits/
    
frame= 1376 fps=550 q=25.0 size=    1986kB time=00:00:45.69 bitrate= 356.1kbits/
    
frame= 1651 fps=550 q=22.0 size=    2377kB time=00:00:55.01 bitrate= 353.9kbits/
    
frame= 1914 fps=546 q=24.0 size=    2776kB time=00:01:03.70 bitrate= 357.0kbits/
    
frame= 2181 fps=545 q=24.0 size=    3163kB time=00:01:12.70 bitrate= 356.4kbits/
    
frame= 2443 fps=543 q=24.0 size=    3566kB time=00:01:21.38 bitrate= 358.9kbits/
    
frame= 2702 fps=540 q=24.0 size=    3939kB time=00:01:30.04 bitrate= 358.4kbits/
    
frame= 2965 fps=539 q=24.0 size=    4338kB time=00:01:38.73 bitrate= 359.9kbits/
    
frame= 3236 fps=539 q=23.0 size=    4731kB time=00:01:48.03 bitrate= 358.7kbits/
    
frame= 3505 fps=539 q=24.0 size=    5130kB time=00:01:56.75 bitrate= 360.0kbits/
    
frame= 3765 fps=537 q=26.0 size=    5521kB time=00:02:05.41 bitrate= 360.6kbits/
    
frame= 4036 fps=538 q=24.0 size=    5905kB time=00:02:14.59 bitrate= 359.4kbits/
    
frame= 4326 fps=540 q=24.0 size=    6343kB time=00:02:24.10 bitrate= 360.6kbits/
    
frame= 4606 fps=542 q=27.0 size=    6783kB time=00:02:33.49 bitrate= 362.0kbits/
    
frame= 4886 fps=543 q=24.0 size=    7168kB time=00:02:42.81 bitrate= 360.7kbits/
    
frame= 5166 fps=544 q=27.0 size=    7616kB time=00:02:52.13 bitrate= 362.5kbits/
    
frame= 5456 fps=545 q=24.0 size=    8020kB time=00:03:01.84 bitrate= 361.3kbits/
    
frame= 5736 fps=546 q=27.0 size=    8458kB time=00:03:11.18 bitrate= 362.4kbits/
    
frame= 6001 fps=545 q=30.0 size=    8849kB time=00:03:20.17 bitrate= 362.1kbits/
    
frame= 6264 fps=544 q=27.0 size=    9233kB time=00:03:28.85 bitrate= 362.2kbits/
    
frame= 6526 fps=544 q=26.0 size=    9611kB time=00:03:37.55 bitrate= 361.9kbits/
    
frame= 6793 fps=543 q=26.0 size=   10006kB time=00:03:46.51 bitrate= 361.9kbits/
    
frame= 7076 fps=544 q=24.0 size=   10410kB time=00:03:55.86 bitrate= 361.6kbits/
    
frame= 7355 fps=544 q=25.0 size=   10835kB time=00:04:05.20 bitrate= 362.0kbits/
    
frame= 7615 fps=543 q=27.0 size=   11236kB time=00:04:13.88 bitrate= 362.5kbits/
    
frame= 7883 fps=543 q=25.0 size=   11625kB time=00:04:22.89 bitrate= 362.3kbits/
    
frame= 8166 fps=544 q=21.0 size=   12040kB time=00:04:32.31 bitrate= 362.2kbits/
    
Starting second pass: moving header on top of the file
    
frame= 8203 fps=540 q=-1.0 Lsize=   12417kB time=00:04:33.74 bitrate= 371.6kbits/s
    
video:10035kB audio:2150kB subtitle:0 global headers:0kB muxing overhead 1.901929%
    
[libx264 @ 0000000000358160] frame I:41    Avg QP:14.13  size: 18349
    
[libx264 @ 0000000000358160] frame P:8162  Avg QP:17.24  size:  1167
    
[libx264 @ 0000000000358160] mb I  I16..4: 24.8%  0.0% 75.2%
    
[libx264 @ 0000000000358160] mb P  I16..4:  0.4%  0.0%  0.3%  P16..4: 29.1%  6.4%  3.2%  0.0%  0.0%    skip:60.7%
    
[libx264 @ 0000000000358160] coded y,uvDC,uvAC intra: 66.1% 74.1% 53.1% inter: 15.3% 20.2% 4.0%
    
[libx264 @ 0000000000358160] i16 v,h,dc,p: 23% 21% 11% 45%
    
[libx264 @ 0000000000358160] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 25% 14%  6%  7% 7%  7%  6%  7%
    
[libx264 @ 0000000000358160] i8c dc,h,v,p: 43% 28% 19% 10%
    
[libx264 @ 0000000000358160] ref P L0: 78.4% 12.6%  4.9%  2.4%  1.7%
    
[libx264 @ 0000000000358160] kb/s:300.33

    The one problem with the incantation above is that on iPad's and iPhones and some Android tablets all you hear is the audio with no video. But the file listed above (contents of the ffprobe) does not have that problem, it WILL play on an iPad, iPhone, Android tablet. I researched causes for "audio, no video" and the recommendations were all over the deck. But, the file listed in the ffprobe DOES play, so if I can match those settings described by the ffprobe for all of the other videos, they should play consistently as well. My challenge is to match the ffprobe settings using ffmpeg and there doesn't seem to be a 1 to 1 match between what I see in ffprobe and the corresponding settings in ffmpeg (a nice utility would be to have ffprobe output the ffmpeg settings that could be used to create a file of similar format).

    I walked through the ffprobe documentation but couldn't find anything that would produce a format that could be used as input to ffmpeg. Suggestions ?

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