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 stream, or the speed of file transfers.
Questions tagged [bitrate]
103 questions
78
votes
1 answer
How to specify audio and video bitrate
I have a mov file with the following media information:
Stream 0
Type: Video
Codec: H264-MPEG-4 AVC (part 10)avc1
Language: English
Resolution: 1280x720
Frame rate: 24
Stream 1
Type: Audio
Codec: MPEG AAC Audio (mp4a)
Language: English
Channels:…
michael
- 6,215
52
votes
15 answers
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 higher audio quality or just in a bigger…
user162573
34
votes
4 answers
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, for which I can easily determine how much data…
Saaru Lindestøkke
- 5,899
31
votes
1 answer
FFmpeg: Keeping quality during conversion
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 equivalent quality. I've done some tests with the…
x74x61
- 3,061
29
votes
2 answers
Determine video bitrate using ffmpeg
I am trying to determine video bitrate(For transcoding) using ffmpeg command,I tried following command.
ffmpeg -i 28572615.wmv
and it produces the following output
Input #0, asf, from '28572615.wmv':
Metadata:
major_brand : isom
…
user2528012
- 437
21
votes
3 answers
How to change audio frequency?
I want to change the frequency of an audio file. Meaning: the whole file should sound (say) one octave higher or lower. How to do it? Using ffmpeg or other command line open source tool would be preferable.
tanon
- 255
20
votes
1 answer
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 duration of 4 minutes. How would I consider the…
Robin
- 253
17
votes
4 answers
How to know whether an audio file is CBR or VBR?
File size of a CBR(Constant bitrate) audio recording can be calculated using a formula:
File Size (Bytes) = (sampling rate) × (bit depth) × (number of channels) × (seconds) / 8
E.g., a 70 minute long CD quality recording will take up 740,880,000…
kev
- 13,200
14
votes
2 answers
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.avi -b:v 500k tos_500k.avi
I am trying this with…
nburk
- 263
7
votes
2 answers
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 60hz 120 hz, etc until you get weird effects. (If…
Joseph
- 253
7
votes
3 answers
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, 256kbps, 320kbps, etc.) tend to follow this…
Gordon Gustafson
- 2,217
7
votes
4 answers
What does the sample rate and sample size of audio means?
In a MP3 audio file, I know theres a bitrate of audio which tells the number of bits in seconds are being used by the player, in other words a measure of quality of audio.
But I'm confused with the terms sample rate and sample size. Are they…
Kappri
- 121
6
votes
2 answers
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 like I5-3570@3.4GHZ+Intel HD Graphics.
I tried…
PanJanek
- 163
5
votes
1 answer
Understanding buffer/bitrate statistics in Media Player Classic
I understand that the two numbers under bitrate are the average bitrate and the current bitrate of each stream.
But what are the two numbers under buffers? I suppose the second one is the amount of data loaded in memory, but what is the first…
netvope
- 5,475
4
votes
2 answers
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], 9000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
…
Prateek
- 395