Your old player says AVI. It really means a list of rules.
DVD players, car screens and photo frames that "play AVI" usually only handle one old codec at a limited size. Renaming or copying the MP4 into an AVI box isn't enough. Pick your device to check a phone video against its rules.
Open MP4, MKV, MOV, AVI, WMV, FLV, RealMedia, DVD VOB, camcorder MTS or almost anything else, and save it as any of 32 formats. The converting happens in this tab. Your video is never uploaded.
Each file is identified from its first bytes as soon as you add it. Once the engine is loaded it is read in full, so you see the real codecs, size and length before you convert.
MPEG-4 Part 14 on the ISO base media format. The safest choice when a file has to play anywhere.
ffmpeg -i input.mp4 -map 0:v:0 -map 0:a:0? -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" -c:v libx264 -preset veryfast -crf 23 -pix_fmt yuv420p -c:a aac -b:a 128k -ac 2 -f mp4 -movflags +faststart video.mp4The original AVI format stops at 2 GB, and many players still read only that version. USB sticks formatted as FAT32 refuse any file over 4 GB. For long videos we lower the bitrate, or split the video into parts that play one after another.
MP4 carries subtitles as a switchable track. AVI doesn't, so if your MP4 has them, there are three ways to bring them along. Which one works depends on the player.
Old AVI codecs need two to three times the data to look as good as H.264. Within a size limit, something has to give. If your device can play MP4 from USB, keep the MP4.
Alternatives that often solve the same playback problem.
Yes, MP4 to AVI conversion is completely free with no signup, no watermark, and no usage limit. Convert as many files as you need.
No. The MP4 to AVI converter runs in your browser when your file is supported there, so the file stays on your device for that workflow, reducing server exposure for that workflow. Confirm the processing mode before using sensitive content.
Most MP4 to AVI conversions finish in under a minute. Expect a longer wait for a bigger file. It runs on your own device either way, with no account step in front of it.
It depends on the pair. Lossless gives you the same thing back, byte for byte. Lossy makes the file smaller and costs you something, though whether you can actually see or hear it is another question.
Yes. The MP4 to AVI converter works on phones, tablets, and desktops in any modern browser including Chrome, Safari, Firefox, and Edge.