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13

In recent versions of FFmpeg, use the crop filter: ffmpeg -i in.mp4 -filter:v "crop=out_w:out_h:x:y" out.mp4 Where the options are as follows: out_w is the width of the output rectangle out_h is the height of the output rectangle x and y specify the top left corner of the output rectangle So, for example, to crop a 640×480 window, starting from ...


6

FFmpeg is probably being used more than you believe. I think the BBC uses it for some workflows, there is evidence that Laika and Weta may use it, and there is a fork called FFmbc which is targeted for professional broadcast usage. YouTube probably uses FFmpeg to decode as shown by some unique decoding issues (but this was several years ago that I read ...


5

From http://www.ffmpeg.org/faq.html: If you have large number of pictures to rename, you can use the following command to ease the burden. The command, using the bourne shell syntax, symbolically links all files in the current directory that match *jpg to the ‘/tmp’ directory in the sequence of ‘img001.jpg’, ‘img002.jpg’ and so on. x=1; for i in *jpg; do ...


5

ffmpeg has removed their x264 presets so the -vpre setting doesn't work any more. Now, I have a script for converting video files to a format my Cellphone can handle. ffmpeg -i input.avi -sws_flags lanczos+accurate_rnd -vf "scale=320:240" -c:v libx264 -crf 20 -preset veryslow -profile:v main -tune fastdecode -c:a copy output.mkv I'll explain each option ...


4

Premiere Pro CS5 should be able to import H.264 video, IIRC, however it may be having trouble with the audio and/or container format. With ffmpeg try re-muxing the video stream without the audio: ffmpeg -i input -an -codec:v copy output.mp4 -an -codec:v copy output.avi If both output.mp4 and output.avi work then we know that the issue lies with the audio ...


4

First of all, if I remember correctly, the DV format is intra-only, and thus if there is various damage that has happened to your video, there should be a relatively big chance of getting at least something out -- given that the file isn't completely broken in the most relevant of places. A good way of checking if there's at least some kind of sanity left ...


4

I suspect you are having problems because you are trying to overwrite the input file with the output, ffmpeg just doesn't work that way. For a single file: ffmpeg -i input.avi -an -c:v copy output.mkv To do every file in a directory, you can use a for loop. For every `file.avi``in the working directory, this command will create an output called ...


4

-profile baseline seems to work for me, using libx264. I use the libx264 presets - for example "slow" gives me the options listed below. there's fast, slow, veryslow and placebo (might be more, can't remember). stib$ ffmbc -i test.mov -vcodec libx264 -preset slow -profile baseline -acodec libfaac -ab 96k -crf 19 test.mp4 ... [libx264 @ 0x101858c00] profile ...


4

Note: This is for recent FFmpeg, not FFmbc, which doesn't use the same option syntax (yet) You need to use the -profile:v option, which has been introduced in FFmpeg 0.9 (afaik) and is now standard in 1.0. ffmpeg -i input.mp4 -c:v libx264 -preset fast -profile:v baseline out.mov Why? -profile was used (and prioritized) for AAC encoding. It's simply ...


4

H.264 does support true lossless compression (see 'Lossless mode' on this page). It seems that to avoid chroma format conversion, you need to encode using the Hi444PP profile, which accepts RGB pixels. However, a cursory search indicates that x264 doesn't support Hi444PP (yet), whereas some commercial codecs like MainConcept do.


4

using the scale filter will do it, but there is a bit more to it. ffmpeg -i input.mov -vf scale=720x406 output.mov will create a movie with the required pixel dimensions, but if you look at the output you'll find that it adds information into the metadata so that it will play back at the same aspect ratio as the original, by using non-square pixels. So ...


3

I'm trying to help. First, I don't understand why you're saying FFMPEG H.264 is not the input format? I don't know the FFMPEG command line well enough (is there anyone who does? ;) ). There's got to be a switch for multipass encoding. I know there are some built-in presets you could probably use and do almost certainly what you're aiming for. These are ...


3

The main reason is support, usability and control. First, lets clarify that FFMPEG is an encoder, QuickTime Pro is a video utility that happens to include multiple encoders and Final Cut Pro is a non-linear editor and has nothing to do with encoders other than the fact it can output to an encoder (generally QuickTime I believe). For big budget commercial ...


3

Devices are often picky, and specifications are usually too uninformative so it's always trial and error. For example, your link indicates that the phone supports MP4 playback, but that is simply a container than can utilize several video and audio formats. MPEG-4 part 2 video and AAC-LC audio (partially based on the working video details you provided) ...


3

I have a large set of jpgs that I want to convert to a video losslessly You can probably just mux the jpg images: ffmpeg -r 30 -i input%03d.jpg -codec copy output.mkv Then compare the md5sums of each frame with the framemd5 muxer: $ ffmpeg -i input%03d.jpg -f framemd5 - 0, 0, 0, 1, 460800, 29bcc2db3726c7dfec1826c5740f603f ...


3

This depends entirely on what kind of 3d video you want. There are numerous formats for 3d video. Some are as simple as placing the left and right images either side by side or one on top of the other (typically compressing them spatially to still take up the original space, for example 1080p video done like this ends up being wither 540 vertical pixels ...


3

1) If you're not going to deinterlace it then stick to the source's field order. 2) I wouldn't bother with the two pass encoding (if indeed it even does anything) - dnxhd will only encode at certain specific fixed bit rates anyway so you're actually pretty constrained for options. 3) You'll see some softening, but it's unavoidable. ffmbc's filtering is ok ...


3

with ffmpeg 0.11.1 it's as easy as: ffmpeg -f image2 -i %*.png out.avi From the man page, in an example under "Video and Audio file format conversion": When importing an image sequence, -i also supports expanding shell-like wildcard patterns (globbing) internally. To lower the chance of interfering with your actual file names and the shell's glob ...


3

I would actually suggest the same thing Mulvya suggested. Whenever I've needed to do stuff like this when dealing with 3D animation renderings, I've renamed the files to make them sequential. It's just easier to work with that way in a lot of different software unless you need to preserve the file names for some reason. Total Commander is also a great ...


3

If you had just 4:3 and 16:9 videos, I would suggest: ffmpeg -i input.mov -filter:v 'scale=-1:768;crop=1024:ih' \ -c:v libx264 -crf 23 -preset veryfast output.mp4 That would scale a video to a height of 768, scaling the width to keep the aspect ratio; and then it crops the width to 1024, keeping the height at 768. However, the fact that you are using 1:1 ...


2

ffmpeg will do it for you - http://stackoverflow.com/questions/5887311/ffmpeg-1-image-1-audio-file-1-video If you want to provide good seeking ability, you will need to provide key frames at certain intervals in the encoding, which will increase the size of the video. The codec will encode the whole frame at each of the keyframes but greatly compress the ...


2

There is no "typical" size. It depends entirely on the quality level and level of motion in the video. I could encode ten hours of video where there is no movement with very little space since the compression would work very well. On the other hand, if I had a video where every frame was completely different from the last, it would take a huge amount of ...


2

Option placement matters Is there an option I'm missing? No, but option placement matters. Options before the input apply to the input, and options before the output generally apply to the output. The exception are global options. See the FFmpeg synopsis and FFmpeg description for more details on option placement. Therefore, you must move your -q ...


2

You seem to have a fundamental misunderstanding of how video works. Video is composed of frames. You can't have millisecond precision because video doesn't have millisecond precision. If there are 30 frames per second in the video, you can only stop after one of those frames. That means your options are only every 1/30th of a second roughly. What are ...


2

I use it in my professional production chain all the time. Last week I was using it to batch through dozens of videos that needed subtitles burnt-in. It would have taken me weeks of tedious labour with Final Cut, it took me a couple of days burning the srts in with ffmpeg, and I was able to automatically rename the files and compress them for the various ...


2

concat filter This method is best if you need to perform additional filtering: Use the trim, atrim, setpts, asetpts, and concat filters: ffmpeg -i input -filter_complex \ "[0:v]trim=60:65,setpts=PTS-STARTPTS[v0]; \ [0:a]atrim=60:65,asetpts=PTS-STARTPTS[a0]; \ [0:v]trim=120:125,setpts=PTS-STARTPTS[v1]; [0:a]atrim=120:125,asetpts=PTS-STARTPTS[a1]; \ ...


2

The bands you're referring to could well just be a limitation of the 8-bit colour space. In theory the way to solve this is to use 10- or 12-bit colour space through every stage from rendering, to editing and mastering, through to output and even in the screen or projector. However your final output is probably going to be displayed in an 8 bits per ...


1

The way I've seen this done in other systems intended for CCTV is to encode every couple of frames compressed with something like MJPEG and then stream that to the client, the server component of ffmpeg, ffserver may be able to help you with that. Of course, depending on your needs a different video codec may be more appropriate, particularly if you intend ...


1

According to Ogg specifications you can take two Ogg files and simply concatenate them together, so you can encode that single image as a single frame Ogg and then do the concatenation however you do that in your Operating System (you didn't state which one). Unfortunately, while this is completely allowed by the standard, many players will have hard time ...


1

This looks to me like an actual issue with the scripts in the preset vs your build of FFMpeg. It appears that the syntax of options being passed to the encoder are incorrect (particularly something related to "wpred" and a missing parens) and since they are not specified in your command line, I can only assume it is the preset that is the problem. I would ...



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