mp4

I have a web page, which (among other things) needs to extract a specific frame from a user-uploaded video. The user seeks to a particular part of a .mp4 in the player, then clicks a button, and an ajax call gets fired off to a php script which takes the .mp4, and the exact time from the video, and uses that to extract a "thumbnail" frame. My current solution is using the php exec command: exec("ffmpeg -i $videoPath -ss $timeOffset -vframes 1 $jpgOutputPath"); ...which works just great, except it's as slow as molasses. My guess is that ffmpeg is a little too much for the job, and I might be

I have the following problem - I am trying to create an app that records video, then save it to the camera roll and after that I am uploading that video to the web. The problem is that the only supported format is "mp4", but my videos are "mov". So my question is how to save video from camera in "mp4" format, or save it in "mov" and then convert it to "mp4". Here's my code: this is how I open the camera: picker = [[UIImagePickerController alloc] init]; picker.sourceType = UIImagePickerControllerSourceTypeCamera; picker.delegate = self; picker.showsCameraControls = YES; picker.allowsEditing =

I am trying to add text subtitles to an .mp4 container using ffmpeg: ffmpeg -i input.mp4 -i input.srt -map 0.0 -map 0.1 -map 1.0 output.mp4 When I am trying to run this line, it gives me an error : Nmber of stream maps must match number of output streams. If I try to change the mp4 to mkv (although mp4 supports text subtitles), like this: ffmpeg -i input.mp4 -i input.srt -map 0.0 -map 0.1 -map 1.0 output.mkv It correctly maps the streams, but gives an error : Encoder (codec id 94210) not found for output stream #0.2 When I launch ffmpeg -codecs I can see that srt codec is supported as decoder

I am using ffmpeg to convert videos to mp4 format. Everything works fine except with MOV format. The command I use for everything is: ffmpeg -i input.mov -strict experimental -sameq -s vga -aspect 1.7777 -vcodec libx264 -preset fast -crf 22 -y output.mp4 but the output I keep getting is: ffmpeg version 0.9, Copyright (c) 2000-2011 the FFmpeg developers built on Mar 12 2012 11:01:05 with gcc 4.4.5 configuration: --enable-libx264 --enable-gpl --disable-yasm libavutil 51. 32. 0 / 51. 32. 0 libavcodec 53. 42. 0 / 53. 42. 0 libavformat 53. 24. 0 / 53. 24. 0 libavdevice 53. 4. 0 / 53. 4. 0

I am using the video tag to play videos. I using php files for the playback like this: <video id="playvideo" preload="auto" width="845" height="395" poster="http://video-js.zencoder.com/oceans-clip.png"> <source src="../getvideo_webm.php" type='video/webm' /> <source src="../getvideo_mp4.php" type='video/mp4'/> <source src="../getvideo_ogv.php" type='video/ogg' /> </video> All .php files are playing fine when i check them directly in the brower. But the above setup with all .php as source files will not play. If i give a straight .mp4 source it will play fine. The getvideo_mp4.php looks like

I've written an MP4 parser that can read atoms in an MP4 just fine, and stitch them back together - the result is a technically valid MP4 file that Quicktime can open and such, but it can't play any audio as I believe the timing/sampling information is all off. I should probably mention I'm only interested in audio. What I'm doing is trying to take the moov atoms/etc from an existing MP4, and then take only a subset of the mdat atom in the file to create a new, smaller MP4. In doing so I've altered the duration in the mvhd atom, as well as the duration in the mdia header. There are no tkhd