I am running FFMPEG on AWS Lambda using nodejs and fluent-ffmpeg. I am able to convert videos recorded on most devices / browsers, but when I attempt to convert videos recorded on Mobile Safari, the length of the output video is ~1/2 a second regardless of the input length.
My Typescript code is:
import * as ffmpeg from 'fluent-ffmpeg';
public static StandardizeVideoFormat(
inputSignedUrl: string,
filename: string,
): Promise<string> {
const localFilePath = `/tmp/${Date.now()}_${filename}.mp4`;
return new Promise((resolve, reject) => {
ffmpeg(inputSignedUrl)
.outputOptions([
'-crf',
'18',
'-vcodec',
'libx264',
'-codec:a',
'aac',
'-preset',
'medium',
])
.output(localFilePath)
.on('start', function (commandLine) {
console.log('Spawned Ffmpeg with command: ' + commandLine);
})
.on('error', function (err) {
reject(err);
})
.on('progress', function (progress) {
console.log('progress', progress);
})
.on('end', function () {
resolve(localFilePath);
})
.run();
});
}
Using FFprobe, The metadata of the input file is:
{
streams: [
{
index: 0,
codec_name: 'h264',
codec_long_name: 'H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10',
profile: 'Baseline',
codec_type: 'video',
codec_tag_string: 'avc1',
codec_tag: '0x31637661',
width: 1920,
height: 1080,
coded_width: 1920,
coded_height: 1080,
closed_captions: 0,
film_grain: 0,
has_b_frames: 0,
sample_aspect_ratio: 'N/A',
display_aspect_ratio: 'N/A',
pix_fmt: 'yuvj420p',
level: 40,
color_range: 'pc',
color_space: 'unknown',
color_transfer: 'unknown',
color_primaries: 'unknown',
chroma_location: 'left',
field_order: 'progressive',
refs: 1,
is_avc: 'true',
nal_length_size: 4,
id: '0x1',
r_frame_rate: '30000/1001',
avg_frame_rate: '60000/1991',
time_base: '1/600',
start_pts: 26,
start_time: 0.043333,
duration_ts: 4008,
duration: 6.68,
bit_rate: 10175170,
max_bit_rate: 'N/A',
bits_per_raw_sample: 8,
nb_frames: 'N/A',
nb_read_frames: 'N/A',
nb_read_packets: 'N/A',
extradata_size: 31,
side_data_type: 'Display Matrix',
displaymatrix: '',
rotation: '-90',
tags: [Object],
disposition: [Object]
},
{
index: 1,
codec_name: 'aac',
codec_long_name: 'AAC (Advanced Audio Coding)',
profile: 'LC',
codec_type: 'audio',
codec_tag_string: 'mp4a',
codec_tag: '0x6134706d',
sample_fmt: 'fltp',
sample_rate: 48000,
channels: 1,
channel_layout: 'mono',
bits_per_sample: 0,
initial_padding: 0,
id: '0x2',
r_frame_rate: '0/0',
avg_frame_rate: '0/0',
time_base: '1/48000',
start_pts: 0,
start_time: 0,
duration_ts: 319488,
duration: 6.656,
bit_rate: 181302,
max_bit_rate: 'N/A',
bits_per_raw_sample: 'N/A',
nb_frames: 'N/A',
nb_read_frames: 'N/A',
nb_read_packets: 'N/A',
extradata_size: 2,
tags: [Object],
disposition: [Object]
}
],
format: {
filename: 'input.mp4',
nb_streams: 2,
nb_programs: 0,
format_name: 'mov,mp4,m4a,3gp,3g2,mj2',
format_long_name: 'QuickTime / MOV',
start_time: 0,
duration: 6.723333,
size: 8651792,
bit_rate: 10294646,
probe_score: 100,
tags: {
major_brand: 'iso5',
minor_version: '1',
compatible_brands: 'isomiso5hlsf',
creation_time: '2023-08-05T19:03:15.000000Z'
}
},
chapters: []
}
Any ideas on why the output of my command on this file always results in a ~0.5 second long output?
Turns out that the version of FFmpeg that I had installed via the @ffmpeg-installer/ffmpeg npm package was ~5 years out of date (compiled in 2017). I manually updated to the latest version and the problem with ios Safari videos disappeared.