The VideoLAN Forums

Posted: **09 Jun 2018 20:45**

Hi,

I'm developing an app using libvlc for android (to allow to be used from unity) but when I play a movie it seems it uses the software decoder and performance is very bad:

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06-09 15:05:30.507 19044-19396/es.arklay.uvlc D/VLC: [b9815b28/4bc4] avcodec decoder: CPU flags: 0x0000003f
06-09 15:05:30.511 19044-19396/es.arklay.uvlc D/VLC: [b9815b28/4bc4] avcodec decoder: allowing 4 thread(s) for decoding
06-09 15:05:30.514 19044-19396/es.arklay.uvlc D/VLC: [b9815b28/4bc4] avcodec decoder: codec (h264) started
06-09 15:05:30.514 19044-19396/es.arklay.uvlc D/VLC: [b9815b28/4bc4] avcodec decoder: using frame thread mode with 4 threads
06-09 15:05:30.514 19044-19396/es.arklay.uvlc D/VLC: [b9815b28/4bc4] core decoder: using decoder module "avcodec"
06-09 15:05:30.515 19044-19396/es.arklay.uvlc D/VLC: [e9fec028/4bc4] core decoder: looking for decoder module matching "mediacodec_ndk,all": 40 candidates
06-09 15:05:30.515 19044-19396/es.arklay.uvlc D/VLC: [e9fec028/4bc4] avcodec decoder: CPU flags: 0x0000003f
06-09 15:05:30.517 19044-19073/es.arklay.uvlc I/MediaSurfacePlugin: MediaSurface:: UnityRenderEvent UPDATE
06-09 15:05:30.521 19044-19396/es.arklay.uvlc D/VLC: [e9fec028/4bc4] avcodec decoder: codec (aac) started
06-09 15:05:30.522 19044-19396/es.arklay.uvlc D/VLC: [e9fec028/4bc4] core decoder: using decoder module "avcodec"
06-09 15:05:30.522 19044-19396/es.arklay.uvlc D/VLC: [eaa49a78/4bc4] core demux meta: looking for meta reader module matching "any": 2 candidates
06-09 15:05:30.524 19044-19396/es.arklay.uvlc D/VLC: [eaa49a78/4bc4] core demux meta: using meta reader module "taglib"
06-09 15:05:30.524 19044-19396/es.arklay.uvlc D/VLC: [eaa5e9a8/4bc4] core demux: removing module "taglib"
06-09 15:05:30.524 19044-19396/es.arklay.uvlc D/VLC: [d8436028/4bc4] core input: `file:///storage/emulated/0/Android/data/es.arklay.uvlc/files/temp.mp4' successfully opened
06-09 15:05:30.525 19044-19396/es.arklay.uvlc D/VLC: [eaa5e9a8/4bc4] mp4 demux: elst (0) gives 0ms (movie)-> 0ms (track)
06-09 15:05:30.525 19044-19396/es.arklay.uvlc D/VLC: [eaa5e9a8/4bc4] mp4 demux: track[Id 0x1] using Sync Sample Box (stss)
06-09 15:05:30.525 19044-19396/es.arklay.uvlc D/VLC: [eaa5e9a8/4bc4] mp4 demux: stss gives 0 --> 0 (sample number)
06-09 15:05:30.525 19044-19396/es.arklay.uvlc D/VLC: [eaa5e9a8/4bc4] mp4 demux: elst (0) gives 0ms (movie)-> 0ms (track)
06-09 15:05:30.525 19044-19396/es.arklay.uvlc D/VLC: [d8436028/4bc4] core input: Buffering 0%
06-09 15:05:30.525 19044-19397/es.arklay.uvlc D/VLC: [b9815b28/4bc5] avcodec decoder: available software decoder output format 0 (yuv420p)
06-09 15:05:30.525 19044-19394/es.arklay.uvlc E/VLC-std: [h264 @ 0xb9816200] Reinit context to 3840x2160, pix_fmt: 0

While debugging VLC it seems to choose ffmpeg (and performance is perfect):

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06-09 19:25:53.125 26218-26311/org.videolan.vlc.debug D/VLC: [bc02ac30/66c7] libvlc decoder: allowing 6 thread(s) for decoding
06-09 19:25:53.127 26218-26311/org.videolan.vlc.debug D/VLC: [bc02ac30/66c7] libvlc decoder: codec (h264) started
    [bc02ac30/66c7] libvlc decoder: using frame thread mode with 6 threads
    [bc02ac30/66c7] libvlc decoder: using video decoder module "avcodec"
06-09 19:25:53.128 26218-26311/org.videolan.vlc.debug D/VLC: [bc02aeb0/66c7] libvlc decoder: looking for audio decoder module matching "mediacodec_ndk,all": 17 candidates
    [bc02aeb0/66c7] libvlc decoder: using ffmpeg Lavc58.6.103
    [bc02aeb0/66c7] libvlc decoder: CPU flags: 0x0000003f
06-09 19:25:53.134 26218-26311/org.videolan.vlc.debug D/VLC: [bc02aeb0/66c7] libvlc decoder: codec (aac) started
    [bc02aeb0/66c7] libvlc decoder: using audio decoder module "avcodec"
    [ab798b10/66c7] libvlc demux meta: looking for meta reader module matching "any": 2 candidates
06-09 19:25:53.137 26218-26311/org.videolan.vlc.debug D/VLC: [ab798b10/66c7] libvlc demux meta: using meta reader module "taglib"
    [ab7fe870/66c7] libvlc demux: removing module "taglib"
    [c2abd830/66c7] libvlc input: `file:///storage/emulated/0/vlctemp.mp4' successfully opened
    [ab7fe870/66c7] libvlc demux: elst (0) gives 0ms (movie)-> 0ms (track)
06-09 19:25:53.137 26218-26218/org.videolan.vlc.debug I/VLC/MediaDatabase: Media.Event.ParsedChanged

Any ideas?

Posted: **10 Jun 2018 10:51**

Isn't hw decoding on by default ?

Posted: **10 Jun 2018 11:43**

Thats what i thought, but i still get a software decoder

Posted: **10 Jun 2018 13:04**

libvlc_video_set_callbacks() is incompatible with, and automatically disables hardware decoding.

Posted: **10 Jun 2018 13:57**

I'm not using libvlc_video_set_callbacks, im using AWindow (libvlc_media_player_set_android_context)

Posted: **13 Jun 2018 19:34**

I even tried LibVLCSharp (https://forum.videolan.org/viewtopic.php?f=32&t=144807) libraries but I still get the same problem...

Tried using Java wrappers, tried calling directly the JNI functions, latest libvlc commit, latest libvlc stable release (both of them compile, build and run properly from android studio in my device) but the error remains... im getting out of ideas

Posted: **13 Jun 2018 19:35**

BTW, my final target is to show the video in a unity texture, I will gladly share the working code here when i get to a working code...

Posted: **16 Jun 2018 08:11**

Hi israelillan,

LibVLCSharp author here.

Try adding

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media.AddOption(":codec=mediacodec_ndk");

And see if you see MediaCodec logs appearing during playback initialization.

Planning to add soon a convenience crossplatform media configuration object for LibVLCSharp https://github.com/videolan/libvlcsharp ... dd0a36e89b

Have a look at this https://code.videolan.org/videolan/vlc- ... .java#L740 for covering most bases.

Good luck

Posted: **16 Jun 2018 08:18**

I will gladly share the working code here when i get to a working code...

Please do. Unity is on the support roadmap.

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