mp4

问题 I am using the Xuggle library to play mp4 videos on a JPanel but video loading is taking 3 sec. or more. Do you have some advice how to play video on JPanel or JLabel in the right way? Is this a good way to show mp4 video? VideoCodec is a Xuggle Codec. This is working but I have a delay of a few seconds. public void setVideoName(final String videoName) { imageAndVideoPanel.removeAll(); final VideoPanel videoPanel = new VideoPanel(); videoPanel.setPreferredSize(Const.Dimensions.VIDEO_SIZE);

问题 I know that object tag embeds objects in html and useful for playing videos/audios. When we specify object with type="video/mpeg" does this use the default player in the device I am having an issue in playing mp4 files. When i use object tag. It is able to play mpeg-2 transport stream though. Also the device player specs says they support mp4. Am i missing anything here. 回答1: You might get help from this website mentioned in this answer to a similar question. Edit: html object tag has some

问题 If I take a .mp4 recorded on my mobile (Samsung S5) and pass it through FFmpeg with the below command, the output file ( fileX.avi ) is a greyscale bitmap uncompressed video file. The offset values in fileX.avi (output from FFmpeg) to allow me to locate the video frame data are always 5680 bytes for the file header. And 62 bytes for the inter frame header. The data is uncompressed RGB24 so i can easily calculate the size of a video frame from height x width x 3. So my C# application can

问题 I'm trying to implement vp9 hardware acceleration encoding process. I followed ffmpeg offical github's example (Here -> vaapi_encode.c). But given example only save a .yuv file to .h264 file, I would like to save the frames to either .mp4 or .webm container. And having the ability to control the quality, and etc. I'm not reading frames from a file, I'm collecting frames from a live feed. When having full 5 secs of frames from the live feed, encode those frames using vp9_vaapi to a 5 secs .mp4

问题 I am at a loss here after searching around with no results. I am attempting to channel the audio specifically from an .mp4 for use in a driver. I am aware that there are programs which extract the audio from .mp4's, but I am looking for another approach without using external applications such as those.. is there any direction that someone can point me towards to solve this problem? Thanks, -K 回答1: The open source library libavcodec, which is part of ffmpeg has the capability to do what you

问题 I knit a Rmd file (to html) with a chunk producing a mp4 movie : ```{r clock, fig.width=7, fig.height=6, fig.show='animate'} par(mar = rep(3, 4)) for (i in seq(pi/2, -4/3 * pi, length = 12)) { plot(0, 0, pch = 20, ann = FALSE, axes = FALSE) arrows(0, 0, cos(i), sin(i)) axis(1, 0, "VI"); axis(2, 0, "IX") axis(3, 0, "XII"); axis(4, 0, "III"); box() } ``` knitr generates the following html code for embedding the mp4 movie : <p><video controls="controls" loop="loop"><source src="figure/clock.mp4"

问题 Days I trying to stream mp4 file with ffserver. I read many questions like these: https://superuser.com/questions/563591/streaming-mp4-with-ffmpeg Begin stream simple mp4 with ffserver http://ffmpeg.gusari.org/viewtopic.php?f=12&t=1190 http://ffmpeg.org/pipermail/ffserver-user/2012-July/000204.html HTML5 - How to stream large .mp4 files? Finally I cant understand is mp4 stream able or not? Is it a way to do this with ffserver? Is there any sample?I read helps but they most about live stream

问题 I am inspecting decoder configuration record contained in .mp4 video file recorded from Android devices. Some devices have strange or incorrect parameters written in decoder configuration record. Here is sample from Galaxy Player 4.0 which is incorrect: DecoderConfigurationRecord: 010283f2ffe100086742000de90283f201000568ce010f20 pictureParameterSetNALUnits : 68ce010f20 AVCLevelIndication : 242 AVCProfileIndication : 2 sequenceParameterSetNALUnits : 6742000de90283f2 lengthSizeMinusOne : 3

问题 I am using GraphRequest from react-native-fbsdk to post to FB from my app. Specifically, I am trying to post a link to an mp4 video that is hosted externally, so at a url like https://img.myapp.com/image_id.mp4 . Here is the code for my request: return new Promise(function(resolve, reject) { const post = new GraphRequest('/me/feed', { httpMethod: 'GET', version: 'v2.9', ...payload, }, (err, result) => { if (err) { reject(err); } resolve(); }); new GraphRequestManager().addRequest(post).start(

问题 I have a directory in which there is a mp4 file (including other files as well) which I want to convert into mp3 and then send it to different directory. I have used the following command line command to covert into mp3 and its working perfectly fine. ffmpeg -i 36031P.mp4 -map 0:2 -ac 1 floor_english.mp3 mp4 file is inside in_folder . Using ffmpeg, I want to convert mp4 file into mp3 and send it to out_folder . <?php $dir = 'in_folder'; $files1 = scandir($dir); print_r($files1); /* It lists