Bitrate refers to the amount of information transferred or processed per unit of time, usually expressed in bits per second (bit/s) or multiples thereof. Bitrate can be used to express a number of things, such as the bandwidth of a computer interface, the level of quality of a digital audio or video ...

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Bit rate reduction when converting 60fps footage into 30fps?

I'm shooting at 60fps, the result is video playing back normal speed but displaying 60fps. I then have stretched the clip so that i get 30fps playback speed with a slow motion clip twice as long as ...
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1answer
47 views

Why ffmpeg changes bitrate of mp3 when speeding it up?

I speeded up (1.2x) an mp3 file using these instructions, but its real bitrate changed from 192 kbps (19 kHz cut-off) to 128 kbps (16 kHz cut-off). Why? Is it right? Or do I need to add any extra ...
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1answer
78 views

What are the factors that affects a video's quality?

I am new to this website and this is my first question, really appreciate if someone can provide some advice about my current problem. I've been testing some videos on my computer to see at what ...
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0answers
35 views

Video delay when using filters in ffmpeg

I try to make video of sport event using raspberry pi. Drawtext filter seems good option to write score on the video. I have problem with synchronization / delay of video. I can see changing points ...
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2answers
70 views

My videoplayer is suddenly buffering local videos

Today I was watching Band of Brothers which I have stored locally on my hard drive in 720p. Watching the first two episodes went perfectly as usual, however when viewing the third episode my Kodi ...
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1answer
93 views

Resize in FFmpeg

I have a video which has a resolution of 1920x1080p. I want to re-encode this video (with libx264 for video and aac for audio); Downscale it first to 1280x720p (with the same aspect ratio) while ...
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1answer
60 views

Bitrate-MediaInfo [closed]

What is the BitRate_Maximum/String (for video and audio) which I've been seeing on MediaInfo (What does "String" means here?) ? Thank you for your time!
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0answers
52 views

Can a 7Gb video file be only 512 kbps?

Windows is telling me that the bit rate of a 7 Gb video I have downloaded is only 64 kbps. I have read I need to multiply by 8 to get the actual bit rate. Still it's only 512 kbps, which seems very ...
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1answer
85 views

Full-SBS 3D movie bitrate when ripping

When ripping movies from iso to full side by side format, 3840x1080 usually (1920x1080 each eye). Shouldn't the bitrate double? I've always wondered that, what do you think?
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36 views

Reduce bitrate inside a .rar file

I've got a .rar file of compressed .mp3 files. I would like to reduce the bitrate of those mp3 files, without extracting them (so as to keep the .rar file). Do you know how? Thank you!
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1answer
28 views

Is there a way to determine resolution of a video using its bitrate?

I have a use case where I need to determine the resolution of a video depending on its bit rate data e.g. 236k, 668k, 1299k, 1900k etc. I also have data about its dimensions e.g. 320x240, 480x360 etc....
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1answer
241 views

When doing 2 pass video encoding with FFmpeg, how to find the optimal bitrate?

When doing 2 pass video encoding with VP8 (libvpx), is there a way to figure out the optimal bitrate, so I don't have to guess? Something like a small compression test, or some ffmpeg command, that ...
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1answer
39 views

Are there any benefits to buying high write speed Blu-ray disks?

There are many different type of blu ray disc out there, the hestitation to buy was started from read/write speed of a blu ray disc. I'm looking for Verbatim/Memorex/Sony disc, the most common read ...
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1answer
187 views

Reducing bitrate with ffmpeg using `-b:v 500k` doesn't actually reduce bitrate to 500k

I am trying to create several downgraded versions of a video file with ffmpeg. I am using the following command via the command line (the command is taken from the documentation): ffmpeg -i ../../tos....
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1answer
414 views

Re-encode AC3 5.1 audio with variable bitrate using FFmpeg

Does the AC3 audio format support variable bitrate encoding? If so, is it possible to use FFmpeg's -vbr option to achieve that? I'd like to avoid converting from 5.1 to a 2-channel stereo because I'...
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1answer
3k views

How to consider bitrate, -maxrate and -bufsize of a video for web

I am using ffmpeg to encode my videos to upload them on the web. I saw this post about using ffmpeg, but didn't quite get as to how to consider the values. Suppose I have a video of size 70 MB with a ...
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1answer
136 views

Does image quality deteriorate in video if rendered with higher bitrate?

Let's say I want to render a music video with a still image on it (1920x1080) resolution, and I know if I were to decrease video bitrate, the image quality would deteriorate, how about if I would ...
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1answer
294 views

Unable to re-encode audio stream with different bitrate using ffmpeg

A similar question has been asked elsewhere without a satisfying answer for me. The following ffmpeg command results in error. When "-c:a copy" is added to just copy the audio stream, the video ...
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1answer
224 views

Search hard drive for all media files of a specific bitrate?

Is it possible to search my hard drive for all MP3's of a 320 bitrate? I am using Windows 7 Professional 64 bit.
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1answer
2k views

Convert all music files to 192 bitrate mp3 except of those already ≤ 192 kbps

What do I have: 100k+ music files in different formats with various bitrates (mp3 64/128/192/256/320kbps, aac 256kbps, flac, alac). Most of them are mp3 320kbps. What do I want: mp3 64/128/192kbps Why:...
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2answers
661 views

'iwlist wlan0 bitrate' says “unknown bit-rate information”

I set bit-rate of wireless interface 'wlan0' using iwconfig wlan0 rate 54M fixed Now, how do I verify if it was set right? iwlist wlan0 bitrate says unknown bit-rate information
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0answers
3k views

FFMPEG encoding settings for 1080/60fps/h264 - framedrops

I want to use latest ffmpeg to encode set of JPG frames to 1920x1080 60fps h.264 movie. I'm looking for set of parameters that will allow smooth playback of encoded video on fairly strong PC machines ...
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1answer
41 views

Is it possible for ffmpeg to encode with a spatially variable bit rate?

I would like to reduce the overall bitrate of a 4K 180 degree FOV video by decreasing detail outside of 60 degrees while retaining it in the center. Is that possible?
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0answers
72 views

ffmpeg bitrate variating without reason

I got a mp4 video. I just want to split it in 4GB file parts using ffmpeg (to make it writeable on FAT32). C:\ffmpeg\ffmpeg.exe -i "%NAME%.mp4" -n -t %LENGTH% -codec copy "%NAME%_1.mp4" C:\ffmpeg\...
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0answers
912 views

Difference between downscaling 1080p to 720p in real time and downscaling during encoding?

Suppose a high quality, uncompressed video is re-encoded twice, with almost identical encoding settings at a relatively low bitrate of 4mbps, but at different resolutions, first at 1080p, and then at ...
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0answers
149 views

Recommended bit-rate value for x264 1st pass

I use x264 to encode content for an Adaptive Bit-Rate workflow. So I run a 1st pass to find the "optimal"GOP structure (but with a --keyint target value) to a given bit-rate X. And next I run ...
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1answer
262 views

How does video encoding bitrate affect duration and why?

Does encoding an uncompressed video into a higher bitrate take longer (than into a lower bitrate)? If so, why - it seems that the encoder should need less effort because it doesn't have to compress ...
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1answer
423 views

1080p 10bit MKV Video is Choppy but Has Smaller File-size?

I've tried VLC, MPC-HC with LAV and CCCP but nothing worked for 1080p 10bit MKV. The video is not always choppy but only during some particular scenes with high content bitrate. I've got 2 versions ...
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2answers
681 views

Solution for choppy video because of bit-rate too high?

When I play a 1080p 10bit-depth video with VLC-player, the video goes choppy and even freezes. I'm using Dell Inspiron 1525 and VLC 2.1.2. Windows Vista Home Premium. Mobile Intel(R) 965 Express ...
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2answers
648 views

How does ffmpeg determine individual stream bitrates?

For example, I have a video for which ffmpeg shows Duration: 00:46:43.72, start: 0.540000, bitrate: 2593 kb/s Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [PAR 16:15 DAR 4:3],...
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1answer
245 views

Filter the video while keeping the bitrate (FFmpeg)

For experimental purposes, I need to filter my video (using -vf option) and change, say, brightness, but keep the same bitrate as in original video. Just for testing purposes, I change RGB values to ...
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votes
2answers
4k views

Can someone explain to me the correlation between bit rate and frame rate?

I understand the higher the FPS, the smoother the image will look at your current resolution. This also corresponds to refresh rate over the monitor. Your FPS can only go as high as your refresh rate ...
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0answers
326 views

Sound forge changes bit rate when overwritting

In Sound Forge 10.0 I cannot keep the same bitrate whenever i overwrite a file. Any solution? My Template box at the "Save as" dialog box is set up for 128 Kbps. If If I rename the file it will be ...
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1answer
1k views

reaching constant video bitrate by using ffmpeg

We use ffmpeg and a transcoding script for transcoding and want to make some batch files which we can use for transcoding. For example I use a parameter called video_kbit and if I am writing in ...
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1answer
511 views

How do I check the video bitrate of an Ogg Theora (ogv) video file?

I've been sent an .ogv file by a video company that's 4 times the file size of the equivalent MP4 file. I suspect they've encoded it at way too high a bitrate, but I'd like to check for sure. I'm on ...
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3answers
5k views

How much data does SSH typically use?

I want to ssh into a laptop (Ubuntu) which will be connected through a 3G connection. Therefore I need to estimate how much data I will be using to choose a suiting plan. Separate from file transfer, ...
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1answer
3k views

Video compression with ffmpeg - Constant quality

I am trying to compress videos of 10 seconds at different bitrates with ffmpeg. My aim is to obtain the same video at different qualities (from very low to very high). I don't want to touch audio part ...
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1answer
2k views

avconv mkv to mkv with audio compression bug

In order to make quality tests, I would like to compress the audio part (to a low bitrate) of a matroska file without damaging video. Audio codec is AAC and video codec is H264. I am using avconv on ...
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1answer
2k views

ffmpeg .mkv to .mkv with audio .aac compression

I am trying to use ffmpeg on a .mkv video to change soundtrack quality. I would like to lower the bitrate of the audio part (to 16 kbps) without any modification of the video. Nevertheless when I use ...
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1answer
47 views

Explanation on network transfer bit rate R

Bit Rate R usually refers to: Number of bits transferred in unit of network time on a link L. I am curious on the sending direction of R. Because data on link L has two directions. Does R means ...
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1answer
1k views

How to see media files (namely `flv`) details/info in Windows 7?

I see that for many media files, under Properties/Details there are some needed info like audio/video bitrate, but it seems limited - for example it does not work for flv. Is there a way that would ...
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15answers
26k views

Does it make sense converting a file to a higher audio bitrate?

When a certain file (mp4, flv, etc) has a 95 kbps audio bitrate - does it make sense outputing to a higher bitrate when converting to mp3 or other format (be it lossy or not)? Would this result in ...
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votes
1answer
1k views

Lower the bitrate of a lossless m4a file

When I try to sync my music library to my iPod touch using iTunes it says that some songs can't be synchronized because the sample rate is too high. Indeed, some files have a bitrate of ~3000 kbps. ...
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1answer
415 views

view video bitrate of a flv file in linux,how?

Is there any command to check the video bitrate of a flv file in debian/ubuntu ? I have some flv files and I want to find out their video bitrate. I check 'file' command It only says 'Macromedia ...
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1answer
16k views

FFmpeg: Keeping quality during conversion [duplicate]

Possible Duplicate: Convert AVI to MP4 keeping the same quality I'd like to convert a good amount of wmv, mpg and avi files (with differing audio and video encodings) to mp4/x264/aac with ...
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1answer
1k views

Media Information for Constant and Variable bit rate of Video files

What is this Maximum bit rate for a .mp4 format file whose bit rate mode is Constant? Media information displayed for MP4 (Using MediaInfo Tool) ID : 1 Format : AVC Format/Info : Advanced Video ...
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0answers
652 views

Trancoding a video with vlc and the MPEG-4 codec with a video bit rate

When I try to trancode a video with vlc using the MPEG-4 codec and a video bit rate, I get the following error : Either both buffer size and max rate or neither must be specified Here is the ...
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3answers
592 views

Why are mp3 bitrates usually multiples of 32? (powers of 2)

I understand why multiples of 2 show up so often in with computers because of their binary nature, but I haven't been able to figure out the most common mp3 bitrates (64kbps, 128kbps, 160kbps, 192kbps,...
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1answer
12k views

Change bitrate of MP4 file

I have to change the bitrate of MP4 files on Mac OS X. What's the best tool to do this conversion? Am I able to do it with QuickTime?
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1answer
96 views

How BroadcomVoice16 use 2-bits per sample to produce voice?

BroadVoice16 (BV16) is a speech codec that operates at an input sampling rate of 8 kHz and an encoding bit rate of 16 kb/s, or 2 bits per sample. That's an excerpt from BroadVoice 16 Speech Codec ...