codec

问题 I am using the moviepy module with python 3.2 on my RPi 2. It uses FFMPEG to read and write the video, so I installed FFMPEG using these instructions to the letter. Now when I run the program, it says that my video export failed because FFMPEG didn't find the libmp3lame codec that it needs. How do I got about installing the libmp3lame codec onto my RPi 2 (running Raspian Wheezy)? I think I have to reinstall FFMPEG to install the codec.. how do I do that correctly? 回答1: First, install lame mp3

问题 How can I decode a FLV's audio if it's recorded from a live stream using Flash Media Server and uses NellyMoser codec? I'm writing a script that process several FLVs, using FFmpeg, so I need a command line solution. Any ideas? 回答1: This should work for you, since NellyMoser is supported by FFmpeg. 1. Using mp3 ffmpeg -i yourinput.flv -vn -acodec libmp3lame output.flv 2. Using AAC (switch aac with libfaac depending on which you have loaded) ffmpeg -i yourinput.flv -vn -acodec libfaac output

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 have the following lines in my code outs = codecs.getwriter('utf-8')(sys.stdout) # dJSON contains JSON message with non-ASCII chars outs.write(json.dumps(dJSON,encoding='utf-8', ensure_ascii=False, indent=indent_val)) I am getting the following exception: outs.write(json.dumps(dJSON,encoding='utf-8', ensure_ascii=False, indent=indent_val)) File "/usr/lib/python2.7/json/__init__.py", line 238, in dumps **kw).encode(obj) File "/usr/lib/python2.7/json/encoder.py", line 204, in encode return ''

问题 Using OpenJFX 11 I am using a mediaplayer to play some clips on a Linux system. Some of them display, others don't. As far as I can tell the only difference in the encoding is, that the not playing video contains an audio track. This is the output of mediainfo for the video that plays: General Complete name : OpenPatricianData/src/main/resources/video/event/BlackDeath.mp4 Format : MPEG-4 Format profile : Base Media Codec ID : isom (isom/iso2/avc1/mp41) File size : 26.0 MiB Duration : 30s 0ms

问题 there are a lot of questions asked regarding opencv + H.264 but none of them gave detailed explanation. i am using openh264(openh264-1.4.0-win32msvc.dll) along with opencv 3.1(custom build with cmake having ffmpeg enabled) in visual studio, i wanted to save video coming from webcam in mp4 format with H.264 compression VideoWriter write = VideoWriter("D:/movie.mp4", CV_FOURCC('H', '2', '6', '4'), 10.0, cv::Size(192, 144), true); before using openh264, in console window i was seeing an warning

问题 I'm receiving an H.264 stream from a DVR using its SDK. There were memory leaks and i thought it was the SDK causing all the leaks. But when i recorded the stream and played the frames one by one reading from the disk (without any 3rd party dlls involved), i noticed that the problem is not the dll but the stream itself. Strange enough, DivX H264 Decoder is the only codec which doesn't cause a memory leak but when the stream runs for a long time, sometimes DivX decoder crashes as well. I'd

问题 I'm messed up with codec issue for days, and still couldn't see the big picture yet. It is my first time to deal with audio/video formats and codecs. So I really need some help about that. Here is the work. I'm writing several components that is responsible for encoding and decoding customized mpeg files. On top of standart de/compression process (for both audio and video) i will implement some custom de/encryption. Writing both codec and software libraries for this. Things i can't figure out

问题 I am developing a voice application, I have 2 options speex and nellymoser .Why should I use speex instead of nellymoser in flex application. 回答1: this should make it clear , Comparison of both codecs for flex: http://askmeflash.com/article/2/speex-vs-nellymoser 回答2: Speex is open source, optimized for speech and seems to have lower bandwidth requirements. However, in Flash/AIR, Speex is always 16 kHz, which is not quite the Skype-like crispness of the sound. Because of that, we're currently

问题 I have been working on a VoIP Application in C sharp language. The purpose of the project is VoIP Call Recording. It uses g729 Codec. I can extract the voice part from RTP payload. How to convert this Byte array to .wav format? Please help me. 回答1: You can try to use ffmpeg.exe and work with it via command line 来源： https://stackoverflow.com/questions/13468240/how-to-convert-g729-encoded-byte-array-to-wav-in-c