问题
I'm trying to play mp4 videos streaming from a server using native VideoView, sadly I keep getting a "Cannot play video" error.
The weird thing is that the same video plays well on Froyo but will not play on HoneyComb. I tried the same video with MX Video Player (on HC) and it plays just fine.
Another major problem is that I cannot re-encode the videos, so I have to use the videos as they are.
- What is causing the error?
- How can I play the video?
- Should I find a way to include a codec library into my app?
Below are details from logcat:
E/MediaExtractor( 242): **********MediaExtractor::Create
D/DivXPlugin( 241): DivXPlugin::onInitialize : 75
D/DivXPlugin( 241): DivXPlugin::onSetOnInfoListener : 75
D/DivXPlugin( 241): DivXPlugin::onOpenDecryptSession: Enter : 75
E/DivXPlugin( 241): DivXPlugin::onOpenDecryptSession() Not a Divx File.
E/DrmManager(Native)( 241): DrmManager::openDecryptSession: no capable plug-in found
D/DivXPlugin( 241): DivXPlugin::onTerminate : 75
E/MediaExtractor( 242): ************Autodetected media content as 'video/mpeg4' with confidence 0.40
D/AwesomePlayer( 242): finishSetDataSource_l getDrmInfo
D/AwesomePlayer( 242): setDataSource_l
E/MPEG4Extractor( 242): ftyp chunk found
D/MPEG4Extractor( 242): kKeyAVCC found
E/MPEG4Extractor( 242): ERROR_MALFORMED because ret=-108
E/MPEG4Extractor( 242): return ERROR_UNSUPPORTED
E/MPEG4Extractor( 242): return ERROR_UNSUPPORTED
D/AwesomePlayer( 242): UNKNOWN_ERROR: no Video and no Audio
D/AwesomePlayer( 242): abortPrepare
D/AwesomePlayer( 242): notifyListener_l
E/MediaPlayer( 3906): error (1, -2147483648)
E/MediaPlayer( 3906): Error (1,-2147483648)
D/VideoView( 3906): Error: 1,-2147483648
And the specs of the video that cannot be played:
General
Format : MPEG-4
Format profile : Base Media
Codec ID : isom
File size : 60.7 MiB
Duration : 7mn 3s
Overall bit rate mode : Variable
Overall bit rate : 1 201 Kbps
Writing application : Lavf52.37.0
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.1
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 7mn 3s
Duration_FirstFrame : 40ms
Bit rate : 1 072 Kbps
Width : 1 024 pixels
Height : 576 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 25.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.073
Stream size : 54.2 MiB (89%)
Writing library : x264 core 65 r0+1016 dbc5ef0
Encoding settings : cabac=1 / ref=4 / deblock=1:0:0 / analyse=0x3:0x113 / me=umh / subme=8 / psy_rd=1.0:0.0 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / chroma_qp_offset=-2 / threads=6 / nr=0 / decimate=1 / mbaff=0 / bframes=16 / b_pyramid=0 / b_adapt=1 / b_bias=0 / direct=3 / wpredb=1 / keyint=125 / keyint_min=25 / scenecut=40(pre) / rc=2pass / bitrate=1072 / ratetol=1.0 / qcomp=0.80 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.41 / pb_ratio=1.25 / aq=1:1.00
Language : English
Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 7mn 3s
Bit rate mode : Variable
Bit rate : 122 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Compression mode : Lossy
Stream size : 6.18 MiB (10%)
Language : English
回答1:
The problem might be with the video encoding. Android FROYO and Gingerbread doesn't support H264 formats other than "Baseline" H264. So if your video is Mp4 & H264 encoded make sure its "AVC baseline" encoded. Use some tools like "Media info" in windows/Linux and check your video encoding.
回答2:
Some Froyo devices (e.g., Samsung Galaxy Tab) use the OpenCore mediaframework while others use Stagefright. From gingerbread all devices to my knowledge use Stagefright. So this could maybe explain your experience.
When playing over HTTP or RSTP there are additional constraints for the video container.
from the developer docs:
For 3GPP and MPEG-4 containers, the moov atom must precede any mdat atoms, but must succeed the ftyp atom.
来源：https://stackoverflow.com/questions/8602385/android-cannot-play-mp4-video