I convert AVI to jpeg. I want to analyze EXIF metadata from jpeg, however, the jpeg file that already converted from AVI does not contain any metadata. Why is the EXIF metadata missing? it is because of the jpeg files originality from AVI?
EXIF is one of several JPEG file format in use. It is not defined by the JPEG standard. There are a number of reasons why you may not find EXIF metadata in your JPEG stream.
First, it is likely that your AVI did not contain such metadata to begin with so there is no metadata to encode.
Second, your AVI to JPEG encoder may not even create EXIF format JPEG streams.
Related
Can any one suggest me from where I can freely download the standard input dataset for the MJPEG codec (encoder and decoder).
I need this mentioned inputs for testing my codec.
For example: Lena, Airplane, and Baboon etc
Standard_Input_Dataset_list
This will help you,
There are available sequence.
https://media.xiph.org/video/derf/
I have a raw video (no header, just Y-channel).
I want do some denoise algorithm on this video.
I convert this raw video by useing ffmpeg with several encoders.
But fail to open with function AVIREAD.
Error using aviread, Unable to locate decompressor to decompress video stream
r210 Uncompressed RGB 10-bit
v210 Uncompressed 4:2:2 10-bit
v308 Uncompressed packed 4:4:4
v410 Uncompressed 4:4:4 10-bit
y41p Uncompressed YUV 4:1:1 12-bit
yuv4 Uncompressed packed 4:2:0
mjpeg MJPEG (Motion JPEG)
ffmpeg -f rawvideo -vcodec rawvideo -s 1920x1080 -r 25 -pix_fmt gray -i WKA00002.y -c:v v308 WKA00002_UnCompAVI.avi
What kind of encoder is suitable for AVIREAD in Matlab?
Thanks a lot
AVIREAD has been removed from the latest versions of MATLAB. Use VIDEOREADER instead.
Motion JPEG AVI is supported by VideoReader.
if you want to try other formats, first check that the file can be opened using Windows Media Player? If so, use VideoReader to try and read the file. If this does not work, can you provide a link to the file that you are using?
Hope this helps.
Dinesh
I have applied JPEG baseline compression algorithm by writing each step in matlab. Now, I have the JPEG compresses image data in binary form and the header to be appended. Please tell me how to make a file that would be recognized as JPEG file by OS. Should it be binary file or what is the process.?
Regards
You are going to need to read two thing:
1) The JPEG standard
2) The standard for some file format (e.g., JFIF, EXIF).
You are going to need to have a JPEG file header (see file format standards). You are going to have to create DHT, DQT, SOF, and SOS markets for the compressed data (JPEG standard).
All of the data is in binary format. You have to remember to convert FF values in the compressed data stream to FFFF.
I have used video.MultimediaFileWriter to write frames from input AVI video file to an output AVI video file. After the output file is created the size of the output file is very large. I have used VideoCompressor's provided in MATLAB options. For example: for an input video size of 3.42MB after using compression techniques provided by MATLAB the output video size is 98.5MB.
Can anyone tell me how to bring the output AVI file to size of the input file?
The creation of videos using H.264 was added in R2012a. Older versions support the less efficient codecs MJPEG and DV, which probably explain your large files. However, this is not a major problem because you can recompress your videos using free tools, such as VirtualDub and x264. Here is a tutorial.
I am using
http://www.subfurther.com/blog/2010/12/13/from-ipod-library-to-pcm-samples-in-far-fewer-steps-than-were-previously-necessary/
to convert m4a file to caf, i was try to look in the setting of the export and didn't find way to convert it to wav instead.
there is a way to convert the caf to wav? there is a more good way to convert m4a to wav?
Sorry if i am quite late to the party. Though i am answering and sharing my knowledge on this issue if it helps anyone.
Converting caf file to wav file isn't too hard. caf and wav both format contains raw PCM data, the only difference is their header info. So if you just replace caf header with wav then it will do the tricks. Just get the PCM data from the caf file and add the wav header on top of the extracted PCM data. To add wav header with PCM data, check this link.
peek at the AudioFile and ExtAudioFile APIs (in AudioToolbox).