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FFMPEG Conversion from GIF to video with audio, take too long
5 novembre 2020, par Mouaad Abdelghafour AITALII'm trying to convert a GIF file into 720p video and merge it with audio, the code below works fine, but it takes a long time to finish the process (depends on the audio length) :


//Converting from GIF to video is fast!

public static String makeVideo(String inputGifPath, String outputPath, int width, int height) {
 return "-y -i " + inputGifPath + " -movflags faststart -pix_fmt yuv420p -vf crop=" + width + ":" + height + ":0:40,scale=1280:720,setsar=1 " + outputPath;
 }



//Merging video with audio takes a lot of time!

public static String addAudio(String audioNoSpace, String inputVideoPath, String outputVideoPath) {
 return "-stream_loop -1 -i " + inputVideoPath + " -i " + audioNoSpace + " -shortest -map 0:v:0 -map 1:a:0 -y " + outputVideoPath;
}


FFMPEG commands :


-y -i file.gif -movflags faststart -pix_fmt yuv420p -vf crop=540:250:0:40,scale=1280:720,setsar=1 video.mp4

-stream_loop -1 -i video.mp4 -i audio.wav -shortest -map 0:v:0 -map 1:a:0 -y final_video.mp4


Part of log :


2020-11-05 19:50:33.092 5721-6212/maa.slowed_reverb W/mobile-ffmpeg: [graph 0 input from stream 0:0 @ 0x70b2dedb00] sws_param option is deprecated and ignored
2020-11-05 19:50:33.112 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: Output #0, mp4, to '/storage/emulated/0/Movies/folder/folder_1604602231893.mp4':
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: Metadata:
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: major_brand : 
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: isom
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: minor_version : 
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: 512
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: compatible_brands: 
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: isomiso2mp41
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: comment : 
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: Optimized with ezgif.com
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: encoder : 
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: Lavf58.48.100
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: Stream #0:0
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: (und)
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: : Video: mpeg4 (mp4v / 0x7634706D), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: , 
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: 12.50 fps, 
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: 12800 tbn, 
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: 12.50 tbc
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: (default)
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: Metadata:
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: handler_name : 
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: VideoHandler
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: encoder : 
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: Lavc58.96.100 mpeg4
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: Side data:
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: 
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: cpb: 
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: bitrate max/min/avg: 0/0/200000 buffer size: 0 
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: vbv_delay: N/A
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: Stream #0:1
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: : Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: Metadata:
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: encoder : 
2020-11-05 19:50:33.113 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: Lavc58.96.100 aac
2020-11-05 19:50:33.462 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 17 fps=0.0 q=4.8 size= 0kB time=00:00:01.28 bitrate= 0.3kbits/s speed=3.27x 
2020-11-05 19:50:33.965 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 54 fps=0.0 q=28.4 size= 256kB time=00:00:04.24 bitrate= 494.7kbits/s speed=4.74x 
2020-11-05 19:50:34.468 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 85 fps= 61 q=24.8 size= 512kB time=00:00:06.72 bitrate= 624.2kbits/s speed=4.81x 
2020-11-05 19:50:34.973 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 117 fps= 61 q=31.0 size= 512kB time=00:00:09.28 bitrate= 452.0kbits/s speed=4.88x 
2020-11-05 19:50:35.478 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 150 fps= 62 q=31.0 size= 768kB time=00:00:11.92 bitrate= 527.8kbits/s speed=4.96x 
2020-11-05 19:50:35.976 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 184 fps= 63 q=31.0 size= 1024kB time=00:00:14.64 bitrate= 573.0kbits/s speed=5.04x 
2020-11-05 19:50:36.478 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 217 fps= 64 q=24.8 size= 1024kB time=00:00:17.28 bitrate= 485.5kbits/s speed=5.07x 
2020-11-05 19:50:36.994 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 249 fps= 63 q=31.0 size= 1280kB time=00:00:19.84 bitrate= 528.5kbits/s speed=5.06x 
2020-11-05 19:50:37.511 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 283 fps= 64 q=31.0 size= 1536kB time=00:00:22.56 bitrate= 557.8kbits/s speed=5.08x 
2020-11-05 19:50:38.012 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 313 fps= 63 q=24.8 size= 1536kB time=00:00:24.96 bitrate= 504.1kbits/s speed=5.05x 
2020-11-05 19:50:38.521 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 345 fps= 63 q=31.0 size= 1792kB time=00:00:27.52 bitrate= 533.4kbits/s speed=5.05x 
2020-11-05 19:50:39.026 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 377 fps= 63 q=31.0 size= 1792kB time=00:00:30.08 bitrate= 488.0kbits/s speed=5.05x 
2020-11-05 19:50:39.534 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 411 fps= 64 q=31.0 size= 2048kB time=00:00:32.80 bitrate= 511.5kbits/s speed=5.07x 
2020-11-05 19:50:40.055 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 443 fps= 63 q=31.0 size= 2304kB time=00:00:35.36 bitrate= 533.8kbits/s speed=5.06x 
2020-11-05 19:50:40.565 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 476 fps= 64 q=31.0 size= 2304kB time=00:00:38.00 bitrate= 496.7kbits/s speed=5.08x 
2020-11-05 19:50:41.056 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 506 fps= 63 q=31.0 size= 2560kB time=00:00:40.40 bitrate= 519.1kbits/s speed=5.06x 
2020-11-05 19:50:41.560 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 538 fps= 63 q=31.0 size= 2560kB time=00:00:42.96 bitrate= 488.2kbits/s speed=5.06x 
2020-11-05 19:50:42.068 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 571 fps= 63 q=31.0 size= 2816kB time=00:00:45.60 bitrate= 505.9kbits/s speed=5.07x 
2020-11-05 19:50:42.574 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 602 fps= 63 q=31.0 size= 3072kB time=00:00:48.08 bitrate= 523.4kbits/s speed=5.06x 
2020-11-05 19:50:43.087 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 636 fps= 64 q=31.0 size= 3072kB time=00:00:50.80 bitrate= 495.4kbits/s speed=5.08x 
2020-11-05 19:50:43.586 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 663 fps= 63 q=31.0 size= 3328kB time=00:00:52.96 bitrate= 514.8kbits/s speed=5.04x 
2020-11-05 19:50:44.086 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 696 fps= 63 q=31.0 size= 3328kB time=00:00:55.63 bitrate= 490.0kbits/s speed=5.05x 
2020-11-05 19:50:44.595 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 728 fps= 63 q=31.0 size= 3584kB time=00:00:58.16 bitrate= 504.8kbits/s speed=5.05x 
2020-11-05 19:50:45.101 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 761 fps= 63 q=31.0 size= 3840kB time=00:01:00.80 bitrate= 517.4kbits/s speed=5.05x 
2020-11-05 19:50:45.602 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 794 fps= 63 q=31.0 size= 3840kB time=00:01:03.44 bitrate= 495.9kbits/s speed=5.06x 
2020-11-05 19:50:46.103 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 827 fps= 63 q=31.0 size= 4096kB time=00:01:06.08 bitrate= 507.8kbits/s speed=5.07x 
2020-11-05 19:50:46.604 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 859 fps= 63 q=31.0 size= 4096kB time=00:01:08.64 bitrate= 488.9kbits/s speed=5.07x 
2020-11-05 19:50:47.116 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 890 fps= 63 q=31.0 size= 4352kB time=00:01:11.12 bitrate= 501.3kbits/s speed=5.06x 
2020-11-05 19:50:47.619 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 924 fps= 64 q=31.0 size= 4608kB time=00:01:13.84 bitrate= 511.2kbits/s speed=5.08x 
2020-11-05 19:50:48.120 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 954 fps= 63 q=31.0 size= 4608kB time=00:01:16.24 bitrate= 495.1kbits/s speed=5.07x 
2020-11-05 19:50:48.631 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 986 fps= 63 q=31.0 size= 4864kB time=00:01:18.80 bitrate= 505.7kbits/s speed=5.06x 
2020-11-05 19:50:49.143 5721-6212/maa.slowed_reverb I/mobile-ffmpeg: frame= 1017 fps= 63 q=31.0 size= 4864kB time=00:01:21.28 bitrate= 490.2kbits/s speed=5.06x


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Anomalie #4342 : Erreur 1071 de mysql : Specified key was too long ; max key length is 1000 bytes
21 octobre 2020Pour info, même problème avec la table spip_mailsubscribers et UNIQUE email (email(255))
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ffmpeg takes too long to start
17 octobre 2020, par SuspendedI have this command in python script, in a loop :


ffmpeg -i somefile.mp4 -ss 00:03:12 -t 00:00:35 piece.mp4 -loglevel error -stats


It cuts out pieces of input file (-i). Input filename, as well as start time (-ss) and length of the piece I cut out (-t) varies, so it reads number of mp4 files and cuts out number of pieces from each one. During execution of the script it might be called around 100 times. My problem is that each time before it starts, there is a delay of 6-15 seconds and it adds up to significant time. How can I get it to start immediately ?


Initially I thought it was process priority problem, but I noticed that even during the "pause", all processors work at 100%, so apparently some work is being done.


The script (process_videos.py) :


import subprocess
import sys
import math
import time

class TF:
 """TimeFormatter class (TF).
This class' reason for being is to convert time in short
form, e.g. 1:33, 0:32, or 23 into long form accepted by
mp4cut function in bash, e.g. 00:01:22, 00:00:32, etc"""

def toLong(self, shrt):
 """Converts time to its long form"""
 sx = '00:00:00'
 ladd = 8 - len(shrt)
 n = sx[:ladd] + shrt
 return n

def toShort(self, lng):
 """Converts time to short form"""
 if lng[0] == '0' or lng[0] == ':':
 return self.toShort(lng[1:])
 else:
 return lng

def toSeconds(self, any_time):
 """Converts time to seconds"""
 if len(any_time) < 3:
 return int(any_time)
 tt = any_time.split(':')
 if len(any_time) < 6: 
 return int(tt[0])*60 + int(tt[1])
 return int(tt[0])*3600 + int(tt[1])*60 + int(tt[2])

def toTime(self, secsInt):
 """"""
 tStr = ''
 hrs, mins, secs = 0, 0, 0
 if secsInt >= 3600:
 hrs = math.floor(secsInt / 3600)
 secsInt = secsInt % 3600
 if secsInt >= 60:
 mins = math.floor(secsInt / 60)
 secsInt = secsInt % 60
 secs = secsInt
 return str(hrs).zfill(2) + ':' + str(mins).zfill(2) + ':' + str(secs).zfill(2)

def minus(self, t_start, t_end):
 """"""
 t_e = self.toSeconds(t_end)
 t_s = self.toSeconds(t_start)
 t_r = t_e - t_s
 hrs, mins, secs = 0, 0, 0
 if t_r >= 3600:
 hrs = math.floor(t_r / 3600)
 t_r = t_r - (hrs * 3600)
 if t_r >= 60:
 mins = math.floor(t_r / 60)
 t_r = t_r - (mins * 60)
 secs = t_r
 hrsf = str(hrs).zfill(2)
 minsf = str(mins).zfill(2)
 secsf = str(secs).zfill(2)
 t_fnl = hrsf + ':' + minsf + ':' + secsf
 return t_fnl

def go_main():
 tf = TF()
 vid_n = 0
 arglen = len(sys.argv)
 if arglen == 2:
 with open(sys.argv[1], 'r') as f_in:
 lines = f_in.readlines()
 start = None
 end = None
 cnt = 0
 for line in lines:
 if line[:5] == 'BEGIN':
 start = cnt
 if line[:3] == 'END':
 end = cnt
 cnt += 1
 if start == None or end == None:
 print('Invalid file format. start = {}, end = {}'.format(start,end))
 return
 else:
 lines_r = lines[start+1:end]
 del lines
 print('videos to process: {}'.format(len(lines_r)))
 f_out_prefix = ""
 for vid in lines_r:
 vid_n += 1
 print('\nProcessing video {}/{}'.format(vid_n, len(lines_r)))
 f_out_prefix = 'v' + str(vid_n) + '-'
 dat = vid.split('!')[1:3]
 title = dat[0]
 dat_t = dat[1].split(',')
 v_pieces = len(dat_t)
 piece_n = 0
 video_pieces = []
 cmd1 = "echo -n \"\" > tmpfile"
 subprocess.run(cmd1, shell=True) 
 print(' new tmpfile created')
 for v_times in dat_t:
 piece_n += 1
 f_out = f_out_prefix + str(piece_n) + '.mp4'
 video_pieces.append(f_out)
 print(' piece filename {} added to video_pieces list'.format(f_out))
 v_times_spl = v_times.split('-')
 v_times_start = v_times_spl[0]
 v_times_end = v_times_spl[1]
 t_st = tf.toLong(v_times_start)
 t_dur = tf.toTime(tf.toSeconds(v_times_end) - tf.toSeconds(v_times_start))
 cmd3 = ["ffmpeg", "-i", title, "-ss", t_st, "-t", t_dur, f_out, "-loglevel", "error", "-stats"]
 print(' cutting out piece {}/{} - {}'.format(piece_n, len(dat_t), t_dur))
 subprocess.run(cmd3)
 for video_piece_name in video_pieces:
 cmd4 = "echo \"file " + video_piece_name + "\" >> tmpfile"
 subprocess.run(cmd4, shell=True)
 print(' filename {} added to tmpfile'.format(video_piece_name))
 vname = f_out_prefix[:-1] + ".mp4"
 print(' name of joined file: {}'.format(vname))
 cmd5 = "ffmpeg -f concat -safe 0 -i tmpfile -c copy joined.mp4 -loglevel error -stats"
 to_be_joined = " ".join(video_pieces)
 print(' joining...')
 join_cmd = subprocess.Popen(cmd5, shell=True)
 join_cmd.wait()
 print(' joined!')
 cmd6 = "mv joined.mp4 " + vname
 rename_cmd = subprocess.Popen(cmd6, shell=True)
 rename_cmd.wait()
 print(' File joined.mp4 renamed to {}'.format(vname))
 cmd7 = "rm " + to_be_joined
 rm_cmd = subprocess.Popen(cmd7, shell=True)
 rm_cmd.wait()
 print('rm command completed - pieces removed')
 cmd8 = "rm tmpfile"
 subprocess.run(cmd8, shell=True)
 print('tmpfile removed')
 print('All done')
 else:
 print('Incorrect number of arguments')

############################
if __name__ == '__main__':
 go_main()


process_videos.py is called from bash terminal like this :


$ python process_videos.py video_data 


video_data file has the following format :


BEGIN
!first_video.mp4!3-23,55-1:34,2:01-3:15,3:34-3:44!
!second_video.mp4!2-7,12-44,1:03-1:33!
END


My system details :


System: Host: snowflake Kernel: 5.4.0-52-generic x86_64 bits: 64 Desktop: Gnome 3.28.4
 Distro: Ubuntu 18.04.5 LTS
Machine: Device: desktop System: Gigabyte product: N/A serial: N/A
Mobo: Gigabyte model: Z77-D3H v: x.x serial: N/A BIOS: American Megatrends v: F14 date: 05/31/2012
CPU: Quad core Intel Core i5-3570 (-MCP-) cache: 6144 KB 
 clock speeds: max: 3800 MHz 1: 1601 MHz 2: 1601 MHz 3: 1601 MHz 4: 1602 MHz
Drives: HDD Total Size: 1060.2GB (55.2% used)
 ID-1: /dev/sda model: ST31000524AS size: 1000.2GB
 ID-2: /dev/sdb model: Corsair_Force_GT size: 60.0GB
Partition: ID-1: / size: 366G used: 282G (82%) fs: ext4 dev: /dev/sda1
 ID-2: swap-1 size: 0.70GB used: 0.00GB (0%) fs: swap dev: /dev/sda5
Info: Processes: 313 Uptime: 16:37 Memory: 3421.4/15906.9MB Client: Shell (bash) inxi: 2.3.56



UPDATE :


Following Charles' advice, I used performance sampling :


# perf record -a -g sleep 180


...and here's the report :


Samples: 74K of event 'cycles', Event count (approx.): 1043554519767
 Children Self Command Shared Object
- 50.56% 45.86% ffmpeg libavcodec.so.57.107.100 
 - 3.10% 0x4489480000002825 
 0.64% 0x7ffaf24b92f0 
 - 2.12% 0x5f7369007265646f 
 av_default_item_name 
 1.39% 0 
- 44.48% 40.59% ffmpeg libx264.so.152 
 5.78% x264_add8x8_idct_avx2.skip_prologue 
 3.13% x264_add8x8_idct_avx2.skip_prologue 
 2.91% x264_add8x8_idct_avx2.skip_prologue 
 2.31% x264_add8x8_idct_avx.skip_prologue 
 2.03% 0 
 1.78% 0x1 
 1.26% x264_add8x8_idct_avx2.skip_prologue 
 1.09% x264_add8x8_idct_avx.skip_prologue 
 1.06% x264_me_search_ref 
 0.97% x264_add8x8_idct_avx.skip_prologue 
 0.60% x264_me_search_ref 
- 38.01% 0.00% ffmpeg [unknown] 
 4.10% 0 
 - 3.49% 0x4489480000002825 
 0.70% 0x7ffaf24b92f0 
 0.56% 0x7f273ae822f0 
 0.50% 0x7f0c4768b2f0 
 - 2.29% 0x5f7369007265646f 
 av_default_item_name 
 1.99% 0x1 
 10.13% 10.12% ffmpeg [kernel.kallsyms] 
- 3.14% 0.73% ffmpeg libavutil.so.55.78.100 
 2.34% av_default_item_name 
- 1.73% 0.21% ffmpeg libpthread-2.27.so 
 - 0.70% pthread_cond_wait@@GLIBC_2.3.2 
 - 0.62% entry_SYSCALL_64_after_hwframe 
 - 0.62% do_syscall_64 
 - 0.57% __x64_sys_futex 
 0.52% do_futex 
 0.93% 0.89% ffmpeg libc-2.27.so 
- 0.64% 0.64% swapper [kernel.kallsyms] 
 0.63% secondary_startup_64 
 0.21% 0.18% ffmpeg libavfilter.so.6.107.100 
 0.20% 0.11% ffmpeg libavformat.so.57.83.100 
 0.12% 0.11% ffmpeg ffmpeg 
 0.11% 0.00% gnome-terminal- [unknown] 
 0.09% 0.07% ffmpeg libm-2.27.so 
 0.08% 0.07% ffmpeg ld-2.27.so 
 0.04% 0.04% gnome-terminal- libglib-2.0.so.0.5600.4




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