ffmpeg

问题 Let's say that I have a list of hundreds of possible video files. Using ffmpeg it's pretty easy to take multiple files and stitch them together to single video output, but that's where the things become tricky. I'm looking for a way to have them stream live and dynamically add videos to queue as stream goes on. Think of something like SSAI but for the whole video. Stream live is there so we don't have a delay while waiting for ffmpeg to finish the whole video but rather start as soon as

问题 Let's say that I have a list of hundreds of possible video files. Using ffmpeg it's pretty easy to take multiple files and stitch them together to single video output, but that's where the things become tricky. I'm looking for a way to have them stream live and dynamically add videos to queue as stream goes on. Think of something like SSAI but for the whole video. Stream live is there so we don't have a delay while waiting for ffmpeg to finish the whole video but rather start as soon as

问题 I am implementing a video player using ffmpeg multimedia framework. I am able to achieve play, pause, increase speed, decrease speed, forward seek, backward seek functionalities. But reverse playback of the video is not so smooth, it stutters a lot. Please help me in understanding video reverse playback. What is the better approach for this? Is there any other multimedia framework which support reverse video playback? Many thanks in advance. 回答1: So, first, some framing of this issue. FFmpeg

问题 I've gone through this - http://writingminds.github.io/ffmpeg-android-java/ I've gotten FFMpeg on Android, as in, my app is able to load the FFMPeg binary. However, ffplay commands do not work. Is it possible to port ffplay into my app? 回答1: Take a look at this lib: http://androidwarzone.blogspot.com.br/2011/12/ffmpeg4android.html FFmpeg4Android is a way your application can run FFmpeg commands, only Java, no need for C code, or NDK. You can use any player that supports streaming, on the

问题 I am using ffmpeg 2.8 on OSX. I try to convert a short mp4 video to webm for adaptive streaming like suggested here http://wiki.webmproject.org/adaptive-streaming/instructions-to-playback-adaptive-webm-using-dash like this: VP9_DASH_PARAMS="-tile-columns 6 -frame-parallel 1" ffmpeg -i t2.mp4 -c:v libvpx-vp9 -s 160x90 -b:v 250k -keyint_min 150 -g 150 ${VP9_DASH_PARAMS} -an -f webm -dash 1 video_160x90_250k.webm ffmpeg -i t2.mp4 -c:a libvorbis -b:a 128k -vn -f webm -dash 1 audio_128k.webm

问题 I've to merge two (or more) audio files (like a guitar and a drum track) into a single file. I'm running over linux CentOS and I'd need a command line tool to do so, because I've got to run this as part of a background process, triggered via crontab of a custom bash script. I also need to be able to change the pan, volume, trim and start time (i.e I want the guitar track to start after 1.25ms after the drum track so that they can be both in sync with each other). My first choice would be

问题 I've to merge two (or more) audio files (like a guitar and a drum track) into a single file. I'm running over linux CentOS and I'd need a command line tool to do so, because I've got to run this as part of a background process, triggered via crontab of a custom bash script. I also need to be able to change the pan, volume, trim and start time (i.e I want the guitar track to start after 1.25ms after the drum track so that they can be both in sync with each other). My first choice would be

问题 I have written some image acquisition software and as I am acquiring these images I want to add the last image onto the end of a video file (a time-lapse of all images acquired so far). This will give a video view of all the images. However I am struggling with trying to add the single frame. I have generated the time-lapse fine. The way I am doing this is waiting until I have gathered 10 images, then I generate the time-lapse. The command I have used to generate the time-lapse I will be

问题 I have written some image acquisition software and as I am acquiring these images I want to add the last image onto the end of a video file (a time-lapse of all images acquired so far). This will give a video view of all the images. However I am struggling with trying to add the single frame. I have generated the time-lapse fine. The way I am doing this is waiting until I have gathered 10 images, then I generate the time-lapse. The command I have used to generate the time-lapse I will be

问题 I have written some image acquisition software and as I am acquiring these images I want to add the last image onto the end of a video file (a time-lapse of all images acquired so far). This will give a video view of all the images. However I am struggling with trying to add the single frame. I have generated the time-lapse fine. The way I am doing this is waiting until I have gathered 10 images, then I generate the time-lapse. The command I have used to generate the time-lapse I will be