On 13-04-2022 16:50, Tobias Rapp wrote:
On 12/04/2022 18:29, Ferdi Scholten wrote:
On 11-04-2022 21:48, Zach Beal wrote:
Hello,
I have compressed AVI files that I want to convert
to an uncompressed format. I do not know what the files are
compressed with because they are exported from data acquisition
software as "compressed AVI". How can this be accomplished with FFmpeg?
I don't think you want uncompressed format. The avi container can
have a lot of different compressed audiovideo formats. There is
however no clear specification of codecs for avi containers as it is
a fairly old one, avi was superseded by asf. both formats were
developed by Microsoft.
Try to use ffprobe to find out which codecs are used in the avi
container. Most likely it will be something like
divx/xvid/realvideo/cinepack as those were the usual suspects in the
avi days.
Most flexible modern container is matroska (mkv). It can most likely
handle those old codecs. Converting them to newer codecs will only
degrade the quality that probably is not very good to begin with.
That applies only when re-encoding with some lossy target codec. When
using a loss-less target codec like Uncompressed (UYVY, v210),
HuffYuv, or FFV1 there is no (additional) generation loss from encoding.
And a suitable container format depends on compatibility with the used
media software. I think support for AVI is generally more common than
for ASF. I agree that Matroska would be good choice if backwards
compatibility is not an issue for you.
Regards, Tobias
Yes, lossless compression will not reduce quality, but will also create
much larger files. No problem if you have ample space, but still
something to consider. Tested it myself, a high quality AVC1 encoded
video (24338 kbps avg bitrate) ended up being about 5 times larger when
transcoded with FFV1
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