I have two videos (.mp4) files. One uploads to whatsapp and another does not.

我有两个视频(.mp4)文件。一个上传到WhatsApp，另一个不上传。

Using ffmpeg I checked their properties:

我使用ffmpeg检查了它们的属性：

a) Properties of video which uploads:

A)上传的视频的属性：

  Duration: 00:00:56.45, start: 0.148000, bitrate: 1404 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1080x1080, 1359 kb/s, 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 47 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
At least one output file must be specified

b) video which does not upload to whatsapp (because its says format not supported)

B)不上传到WhatsApp的视频(因为它说格式不受支持)

  Duration: 00:00:56.10, start: 0.000000, bitrate: 543 kb/s
    Stream #0:0: Video: h264 (High) (H264 / 0x34363248), yuv420p, 1080x1080 [SAR 1:1 DAR 1:1], 464 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 47.95 tbc
    Stream #0:1: Audio: aac (LC) ([255][0][0][0] / 0x00FF), 48000 Hz, stereo, fltp, 56 kb/s

The difference in video I noticed:

我注意到视频的不同之处在于：

(avc1 / 0x31637661) vs (H264 / 0x34363248)

(avc1/0x31637661)vs(H264/0x34363248)

1359 kb/s vs 464 kb/s

1359kb/S vs 464kb/S

90k tbn vs 23.98 tbn

90K TBN与23.98 TBN

What can be the reason?

可能的原因是什么？

Also the second video is not being played in Android.

此外，第二个视频没有在Android上播放。

The link for the video is https://drive.google.com/open?id=0B4UM6vTHw4pyMExQQ1lxZGp0N2c

该视频的链接为https://drive.google.com/open?id=0B4UM6vTHw4pyMExQQ1lxZGp0N2c

There are some options for a better compatibility:

有一些选项可以实现更好的兼容性：

ffmpeg -i broken.mp4 -c:v libx264 -profile:v baseline -level 3.0 -pix_fmt yuv420p working.mp4

Ffmpeg-i broken.mp4-c：v libx264-配置文件：v基线级别3.0-pix_fmt yuv420p working.mp4

With -profile:v baseline -level 3.0 you make the file more compatible with most older players, including WhatsApp ;). Although, this disables some advanced features.

使用-Profile：v Baseline-Level 3.0，您可以使文件与大多数较旧的播放器更兼容，包括WhatsApp；)。不过，这会禁用一些高级功能。

-pix_fmt yuv420p is necessary to compile to baseline (YUV planar color space with 4:2:0 chroma subsampling).

-pix_fmt yuv420p是编译为基线所必需的(具有4：2：0色度次采样的YUV平面色彩空间)。

Also, you can adjust other options as bitrate, framerate, audio, etc.

此外，您还可以调整其他选项，如比特率、帧速率、音频等。

Source: H.264 docs

来源：H.264文档

I tried all previous commands and I got some errors. I was able to encode my video using this command and here is the explanation and why I set it up like this for a better compatibility:

我尝试了所有前面的命令，但得到了一些错误。我可以使用这个命令对我的视频进行编码，以下是我的解释以及为什么我这样设置它以获得更好的兼容性：

ffmpeg -i input.mp4 \
 -c:v libx264 -pix_fmt yuv420p \
 -profile:v baseline -level 3.0 \
 -vf "pad=ceil(iw/2)*2:ceil(ih/2)*2" -vb 1024k \
 -acodec aac -ar 44100 -ac 2\
 -minrate 1024k -maxrate 1024k -bufsize 1024k \
 -movflags +faststart \
 output.mp4

• If your input contains AAC audio you can stream copy instead of re-encoding by changing -acodec aac -ar 44100 -ac 2 to -acodec copy to preserve the audio quality.

Note about faststart

Normally, a MP4 file has all its metadata packets stored at the end of the file, in data units named atoms. The mdat atom is located before the moov atom. If the file is created by adding the -movflags faststart, the moov atom is moved at the beginning of the MP4 file. By using this option, the moov atom is located before the mdat atom. This allows video playback to begin before the file has been completely downloaded.

通常，MP4文件的所有元数据包都存储在文件的末尾，存储在名为ATOM的数据单元中。Mdat原子位于moov原子之前。如果该文件是通过添加-mov FastStart创建的，则moov原子将移动到MP4文件的开头。通过使用该选项，moov原子位于mdat原子之前。这允许在文件完全下载之前开始视频回放。

Copied from https://www.reddit.com/r/ffmpeg/comments/564kyc/ffmpeg_whatsapp_video_format_not_supported/?st=ivjxdi0v&sh=848ce7eb

从https://www.reddit.com/r/ffmpeg/comments/564kyc/ffmpeg_whatsapp_video_format_not_supported/?st=ivjxdi0v&sh=848ce7eb复制

ffmpeg -i brokenvideo.mp4 -c:v libx264 -c:a aac fixedvideo.mp4

Also had to apply this fix: FFMPEG (libx264) "height not divisible by 2"

我还不得不应用这个修正：FFmpeg(Libx264)“高度不能被2整除”

This is worked for me in 2020

这对我在2020年很管用

ffmpeg -i broken.mp4 -c:v libx264 -profile:v high -level 3.0 -pix_fmt yuv420p -brand mp42 fixed.mp4

2023-01-22 I used the most upvoted answer format and it worked for video, but audio was not working on iPhones. Here's what worked for me:

2023-01-22我使用了最受欢迎的答案格式，它对视频有效，但音频在iPhone上不起作用。以下是对我起作用的方法：

ffmpeg -i broken.mp4 -c:v libx264 -profile:v baseline -level 3.0 -pix_fmt yuv420p -ac 2 working.mp4

I had to add -ac 2 because the audio format I had wasn't seen as stereo by iOS.

我不得不添加-ac 2，因为我的音频格式在iOS中并不是立体声格式。

Copying @teocci's answer for powershell:

复制@teocci对PowerShell的回答：

ffmpeg -i 'input.mp4' `
-c:v libx264 -pix_fmt yuv420p `
-vf "pad=ceil(iw/2)*2:ceil(ih/2)*2" -vb 1024k `
-acodec aac -ar 44100 -ac 2 `
-minrate 1024k -maxrate 1024k -bufsize 1024k `
-movflags +faststart `
output.mp4

If you video already has aac:

如果您的视频已有AAC：

ffmpeg -i 'input.mp4' `
-c:v libx264 -pix_fmt yuv420p `
-vf "pad=ceil(iw/2)*2:ceil(ih/2)*2" -vb 1024k `
-acodec copy `
-minrate 1024k -maxrate 1024k -bufsize 1024k `
-movflags +faststart `
output.mp4

Check out the original answer for mode details. Not allowed to comment so posting an answer instead

有关模式的详细信息，请查看原始答案。不允许发表评论，因此改为发布答案