decoder

How does MPlayer recognize an MJPEG stream?

帅比萌擦擦* 提交于 2021-02-07 19:46:01
问题 Since MJPEG over http consists basically on the transmission of a series of JPEG images seperated by a defined seperator, how does MPlayer recognize that it is an MJPEG stream? Thank you 回答1: Have a look at: MplayerMjpegStreamViewing < Motion < Foswiki e.g. mplayer -fps 4 -demuxer lavf http://rpi-6:8080/?action=stream does the job for me. Suitable for a streaming server running on a Raspberry like this: /usr/local/bin/mjpg_streamer -o output_http.so -w ./www -i input_raspicam.so -x 1920 -y

ffmpeg commands to concatenate different type and resolution videos into 1 video and can be played in android

£可爱£侵袭症+ 提交于 2021-02-06 15:52:09
问题 I want to concatinate 4 different videos of 4 different resolution and type into 1 video which can be played in android. I am using ffmpeg ported on android using https://github.com/guardianproject/android-ffmpeg So I have these 4 different types of videos 1) ./ffmpeg -i 1.mp4 Video: h264 (High), yuv420p, 1920x1080, 16959 kb/s, 29.85 fps, 90k tbr, 90k tbn, 180k tbc Audio: aac, 48000 Hz, stereo, s16, 106 kb/s 2) ffmpeg -i 2.mp4 Video: h264 (Constrained Baseline), yuv420p, 640x480, 3102 kb/s,

Elm: Decode a JSON array with a single element into a string

让人想犯罪 __ 提交于 2020-08-25 03:44:10
问题 had a look for something like this, but can't find the exact issue. I have a JSON back from server side validation that looks like: { "field": ["field-name"], "messages":["message","message"] } What I would like to do is decode it into an elm record like { field: String, messages: List String } However, I'm having trouble with the err, field field. I'm having trouble turning a single element JSON array into just a string of that element. Is it even possible with Decode, or am I better of

Iteration on images with Pytorch: error due to CUDA memory issue with batch size 1

孤街浪徒 提交于 2020-08-10 19:46:53
问题 During training, the architecture generates three models and now encoder is used to encode images with iterations=16. After performing 6 iteration, i got an error. "CUDA out of memory". I have 4 gpus and i also implemented dataparallel class but it does not work Transformation while training train_transform = transforms.Compose([ #transforms.RandomCrop((32, 32)), transforms.ToPILImage(), transforms.Resize((512, 512)), #transforms.ColorJitter(brightness=0.5), transforms.ToTensor(), ]) Encoder

What android devices/decoder has supported adaptive video playback

可紊 提交于 2020-01-13 05:48:28
问题 I've tested on Nexus 5 that codecInfo.isFeatureSupported(MediaCodecInfo.CodecCapabilities.FEATURE_AdaptivePlayback) returns false. Does anyone know what chipset/software codec has supported the feature? https://developer.android.com/reference/android/media/MediaCodecInfo.CodecCapabilities.html#FEATURE_AdaptivePlayback Thanks 回答1: This is supported on most Nexus devices past KK MR1. Note, that it is HW video decoders only. Nexus 5 (KK MR1): // Qualcomm Snapdragon 800 OMX.qcom.video.decoder.avc

Video decoder on Cuda ffmpeg

亡梦爱人 提交于 2020-01-01 19:37:27
问题 I starting to implement custum video decoder that utilize cuda HW decoder to generate YUV frame for next to encode it. How can I fill "CUVIDPICPARAMS" struc ??? Is it possible? My algorithm are: For get video stream packet I'm use ffmpeg-dev libs avcodec, avformat... My steps: 1) Open input file: avformat_open_input(&ff_formatContext,in_filename,nullptr,nullptr); 2) Get video stream property's: avformat_find_stream_info(ff_formatContext,nullptr); 3) Get video stream: ff_video_stream=ff

Codec which supports intra-frame

孤街浪徒 提交于 2019-12-25 09:24:38
问题 I'm using VirtualDub and I want to digitalize a VHS movie frame by frame. But I need a codec which supports intra-frames. Do the following codecs supports intra-frame? If not where can I get or buy a codec with intra-frame? 回答1: From your current choices: Lagarith may be ok Xvid can be set to intra mode but this is somewhat pointless. There is a lot of better free codecs. utvideo and magicyuv are excellent lossless intra codecs. cineform is very good lossy intra codec but somewhat more

How to decode tagged union types in Elm?

一笑奈何 提交于 2019-12-23 08:54:15
问题 If I have a certain tagged union type, like Shape here, how would I construct a JSON decoder for it in Elm? type alias Rectangle = { width : Int, height : Int } type alias Circle = { radius: Int } type Shape = ShapeRectangle Rectangle | ShapeCircle Circle 回答1: Given your JSON looks like { "radius" : 10 } or { "width" : 20, "height" : 15} Then this will do the trick import Json.Decode as Json exposing ((:=)) decodeShape : Json.Decoder Shape decodeShape = Json.oneOf [ decodeShapeRectangle ,

How to write a base64 decoded png image to file?

风流意气都作罢 提交于 2019-12-23 02:49:14
问题 I try to write a base64 png image to file with following code: imageReader := base64.NewDecoder(base64.StdEncoding, strings.NewReader(Images[i])) pngImage, _, err := image.Decode(imageReader) if err != nil { beego.Error(err) } bounds := pngImage.Bounds() if imgFile, err = os.Create(fileName + ".png"); err != nil { return Data{} } defer imgFile.Close() _, err = imgFile.Write([]byte(pngImage)) The bounds are ok. The error message for the last line is cannot convert pngImage (type image.Image)