ffmpeg

问题 I'd like to capture audio streaming from a live radio on internet using ffmpeg. If you have some examples or documentation it will be very appreciated. 回答1: Assuming the protocol is HTTP and audio format is MP3 it can be as simple as: ffmpeg -i http://server:port -c copy output.mp3 See: FFmpeg Protocols Documentation ffmpeg Documentation: Stream copy 来源： https://stackoverflow.com/questions/45239954/how-to-capture-audio-streaming-with-ffmpeg

问题 i am trying to make a video from selected images from command line using ffmpeg in android using this project as my source i m trying to make video this is the command i m trying to create video String[] ffmpegCommand = {ffmpegBin, "-y", "-qscale", "1", "-r", "" + frameRate, "-i", image1.getAbsolutePath(), "-t", "" + (((4) * 30) + 4), //"-s",heightwidth, "-i", image2.getAbsolutePath(), "-t", "" + (((4) * 30) + 4), //"-s",heightwidth, "-i", image3.getAbsolutePath(), "-t", "" + (((4) * 30) + 4)

问题 I have tried to use a ffmpeg to extract an audio from a video file and this is my code import io import os import subprocess def extract_audio(video,output): command = "ffmpeg -i '{video}' -ac 1 -f flac -vn '{output}'" subprocess.call(command,shell=True) extract_audio('dm.MOV','dm-new.flac') And I got no error after compiled. By doing this I should get a new file which is 'dm-new.flac'. But there is no such a flac file created after I compile the script. I think there are something wrong with

问题 I have tried to use a ffmpeg to extract an audio from a video file and this is my code import io import os import subprocess def extract_audio(video,output): command = "ffmpeg -i '{video}' -ac 1 -f flac -vn '{output}'" subprocess.call(command,shell=True) extract_audio('dm.MOV','dm-new.flac') And I got no error after compiled. By doing this I should get a new file which is 'dm-new.flac'. But there is no such a flac file created after I compile the script. I think there are something wrong with

问题 I am decoding h264 rtp stream with ffmpeg on android. I found a strange problem: if I don't call avformat_find_stream_info ,decoding P frame takes tens of micro seconds, by contrast, calling avformat_find_stream_info before decoding will reduce P frame decoding time to less than 1 ms on average. However, avformat_find_stream_info itself is time consuming on network streams. Are there anything I can do to make decoding fast without calling avformat_find_stream_info ? 回答1: When avformat_find

问题 I am decoding h264 rtp stream with ffmpeg on android. I found a strange problem: if I don't call avformat_find_stream_info ,decoding P frame takes tens of micro seconds, by contrast, calling avformat_find_stream_info before decoding will reduce P frame decoding time to less than 1 ms on average. However, avformat_find_stream_info itself is time consuming on network streams. Are there anything I can do to make decoding fast without calling avformat_find_stream_info ? 回答1: When avformat_find

问题 I am decoding h264 rtp stream with ffmpeg on android. I found a strange problem: if I don't call avformat_find_stream_info ,decoding P frame takes tens of micro seconds, by contrast, calling avformat_find_stream_info before decoding will reduce P frame decoding time to less than 1 ms on average. However, avformat_find_stream_info itself is time consuming on network streams. Are there anything I can do to make decoding fast without calling avformat_find_stream_info ? 回答1: When avformat_find

问题 I am decoding h264 rtp stream with ffmpeg on android. I found a strange problem: if I don't call avformat_find_stream_info ,decoding P frame takes tens of micro seconds, by contrast, calling avformat_find_stream_info before decoding will reduce P frame decoding time to less than 1 ms on average. However, avformat_find_stream_info itself is time consuming on network streams. Are there anything I can do to make decoding fast without calling avformat_find_stream_info ? 回答1: When avformat_find

问题 I have a FLAC file which I need to split into several distinct FLAC files, each of which must be below 100 MB in size. Are there any UNIX tools which can do this for me? Can I implement this logic myself? Side-note: since FLAC is compressed, I figure that the easiest solution will require first converting the file to WAV. 回答1: There are two parts to your question. Convert existing FLAC audio file to some other format like wav Split converted wav file into chunk of specific size. Obviously,

问题 I have a FLAC file which I need to split into several distinct FLAC files, each of which must be below 100 MB in size. Are there any UNIX tools which can do this for me? Can I implement this logic myself? Side-note: since FLAC is compressed, I figure that the easiest solution will require first converting the file to WAV. 回答1: There are two parts to your question. Convert existing FLAC audio file to some other format like wav Split converted wav file into chunk of specific size. Obviously,