Re: Convertir Un Video Mpeg A Mp4
Katja Gains
The output using ffmpeg -i input.wav -vn -ac 2 -b:a 160k output1.mp3 is constant bit rate, however ffmpeg writes a header with the title Xing and Mediainfo infers that to indicate VBR. Disable writing that header if you want Mediainfo to detect Constant bit rate.
(I have found this somewhere in the Internet and modified a little bit - changed the resoultion, the refresh rate and the output format (from VOB to bare MPG)) succesfully but the quality is still too bad.
Anther thing I actually need (I have chosen not to include it in the question title to avoid making it too specific but I'd appreciate it being considered in the answers) is adding pure silence as a sound track - there is no sound in the original but the TV set complains about it and I'd like to get rid of this complain. I have generated a same-length (second-precise) silence OGG Vorbis file using Audacity but I can't manage to merge it with the video:
The problem is that the default bitrate for the MPEG-2 is rather low (as with most other video encoders in ffmpeg, the H.264 one being an exception). MPEG-2 is also not the best choice as a codec these days.
Increase the bitrate. You're now using -b:v 2500k. If it's HD video, you will not get far with only 2.5 MBit/s. You need at least double that or even more to make the result look good. For example, use -b:v 6000k -target pal-dvd.
I chose MP3 as codec. MPEG files cannot contain audio other than MPEG Layer I and II audio as well as PCM streams, so using a silent Ogg Vorbis file will not work unless you convert the audio stream as well (which is not what you're doing when you use -c:a copy).
Click the 'Export' button. Choose either 'Subrip subtitle file (.srt)' or 'WebVTT file (.vtt)' from the dropdown to download the subtitle version of your MPEG file. You can also adjust the character length and time duration length of each subtitle.
Yes, Sonix does automatically transcribe video files with a .MPEG file extension. Sonix is an online video to text converter. Convert any audio (mp3, m4a, wav, ...) or video (mpeg, mp4, mov, avi, ...) file to text without installing any software! Sonix quickly and accurately transcribes *.MPEG files and converts them to text in a subtitle format.
I don't know a lot about the individual video formats and codecs but what I am trying to do is convert modern videos (like say ones I've downloaded from Youtube to .mp4 format) to a format that can play in older version of Windows Media Player or Winamp on a Windows 98 machine. I know the codec is more the culprit than the container but I've tried several different programs and several different containers and codecs to convert the files to .avi or .wmv., etc, and nothing will play correctly on the Win98 machine. Usually, the audio will play but no video. I'm not so much looking for a more modern video player that happens to work in 98, but rather I want to make the videos compatible with what I already have (Winamp 5.35 and/or Media Player 6.4). Quality loss in the conversion is not a huge concern to me.
ffmpeg is the tool you want. e.g. ffmpeg -i file.mp4 -vcodec copy -acodec copy file.avi
You would specify the compatible codecs instead of "copy"
I'm sure there's a Windows release but it's very easy to use in Linux.
I don't know what codecs you tried .... the only time I remember having problems is when I tried to encode to WMV9 (using FFmpeg) to play on a PocketPC, and that didn't work (ffmpeg had no wmv9 encoder at the time), and I had to resort to a XP VM with the MS Windows Media Encoder 9 tool to do the job. Not that I'm suggesting that, because the WM9 Encoder can only target down to WMV7, and I'm not sure if there is a way to install WMV7 decoder while still using WM 6.
In case of doubt, you can always encode video to Cinepak, that should work even in Windows 3.1x..
(Just kidding, MPEG(1) is also available on anything from Win95 upwards, and is miles better. That's also an option which has many available free encoders these days.).
For Pentium 3 and above DivX/Xvid codec is OK.
For weaker CPUs I would try mpeg1(VCD resolution)/mpeg2(DVD resolution) (some older graphics cards have decoding or color conversion support in hardware).
Of course you need codec pack (KLite codec pack, of ffdshow build for Windows9x, or Media Player Classic url which has most of the codecs built in).
I actually like a bundle version of MediaEspresso that came on a laptop, I seem to be able to do everything I want to do with that, but not 100% sure it works with generic Win98 players, IIRC I had media player 9 or something and maybe a codec pack on the longest running 98 box, so was converting for early noughties standards at least. Anyhoo, dig through your graphics card and motherboard driver CDs and see if you got a free version. There's a 30 day trial on their site otherwise.
For some reason the decoder still seems to crap itself when the video size is larger than around 400x300 , so you have to use stamp sizes (thus the -vf scale option). Or it may be a bitrate thing, I didn't experiment much.
I'm not sure if FFMPEG has any switches for compressing CinePak encodes to a smaller size, this may not be possible due to how differently the codec works compared to more modern codecs. Looking at my CinePak encodes, I've noticed that the audio sample rate makes a difference in file size since you're using raw lossless PCM audio for compatibility issues. For example, a 3 minute 30 second long Cinepak video at 320x240 12FPS with 22KHz audio is 75MB in size while the same video with 11KHz audio is 52MB. If you're OK with a lower audio fidelity, you could try encoding replacing "-ar 22050" with "-ar 11025" for 11KHz audio and possibly use "pcm_u8" as your audio codec if you really want it to be as small as possible.
Did you try MPEG-1 ? I keep thinking that for a 98-era machine Cinepak is like a bad joke. If it has enough horsepower to decode it, the MPEG codecs are on another league entirely. And 98 should definitely come with MPEG-1. SE came with MPEG4... (part-2 aka asf aka divx, not h264).
MPEG/MPG is a widely used media format that supports for TV quality transmission of digital video, and for movies that are distributed on DVD discs. At the same time, it supports for interlaced video and can contain high compressed movie content while produces good quality. But, despite functionality, it's probably not the compatible format when it comes to playing mpeg video on a majority of devices and video players like PS4, HTC Flyer. Luckily, AVI is such a format fit for nearly every occasion.
You probably have an mpeg movie in your media collection, but you want to convert those MPEG to AVI file on Mac to watch on your mobile phone, tablet wherever you are. There are a variety of different MPEG/MPG video conversion programs out there, but our favorite method uses a program called Video Converter, a downloadable program with many formats available to convert from and to.
Video Converter for Mac is one simple program that specializes in digital video conversion including .mpeg to .avi format, it's easy to use and supports conversions between virtually all popular video & audio formats. If you are looking for a way to make reverse conversion from AVI to MPEG file on Mac OS X, the program can do it, too. Besides, it also comes in handy for frame cropping, movie trimming, and video effect adjustment, etc.
For the purpose of this conversion, we will need the program export to AVI file. So, click "Profile" drop-down box to enter format list section, and then choose AVI under General Video list (or HD AVI under HD Video list, depending on your source MPEG files).
Aside from exporting a specific format available, the software also has developed ready-made presets shown on the left hand side of the panel for popular devices. Just tick the icon corresponding to your device and this MPG to AVI encoder will automatically update the output settings that is appropriate for your device.
After you have your video settings and destination configured, click the "Convert" button on the bottom right corner to start conversion process. You should now see a blue progress bar running as the conversion takes place.
Tips: This MPEG/MPG video converter for Mac can also help you extract sound from MPEG/MPG and write .FLV into .AVI, VOB to AVI, or change AVI from camcorder AVCHD file, MKV, 3GP, ASF, MOD etc. without losing quality.
Video Converter does have the same features as a regular video conversion utility you can find in the web, but it can offers other features including settings tweaking, presets choosing, video editing, giving you more control over the result file. Even better, it's damn simple to use, and accomplishes the tasks quickly.
There are many questions about converting MP4 video to MPEG in different forums. Some people have difficulties with the certain free MP4 converter Mac, while others have no idea how to convert an MP4 file to a MPEG on Mac. Here are some common examples you can see.
If you are a member of those groups of people, then you can read following paragraphs to seek simple but useful solutions. Now, let's take a look at detailed processes of how to convert MP4 to MPEG on Mac OS X.
Some people may hold the idea that MP4 and MPEG is the same thing. Actually, MP4 is one of file extensions developed by MPEG (Moving Picture Experts Group). MP4 file extension is short for MPEG-4 Part 14, which uses H.264 or MPEG-4 to code data and hold AAC or AC3 audio. Furthermore, MP4 has been the most popular video format accepted by most online websites and offline portable devices.
As for MPEG-1 and MPEG-2, they are standard for lossy video and audio compressions. To be more specific, MPEG-1 is widely used in DVD, while MPEG-2 is the default format accepted by DVD, camcorder, DVB and more. In addition, the related file extension is .mpeg or .mpg. Thus, if you want to output videos to those digital devices, you need to convert MP4 to MPEG on Mac OS X in advanced.
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