I am making mp4 files from a series of images. The images should run about 1 hour but I cannot get a full video because FFMPEG looks for a file it should not have.
[image2 # 0x55fe14bef700] Could not open file : /mnt/run/image-005437.jpeg
What is confusing is that the list that I pass to ffmpeg should not include that file. If my script does not like the result it sends the file to a sub directory in the target folder called failed
the location of the file with that number
$ pwd
run/failed
]$ ls
failed-005437.jpeg
the command I use to launch ffmpeg is the following
image_folder=$1
singularity exec --bind $work_dir:/mnt $work_dir/longleaf2.sif ffmpeg -f concat -safe 0 -y -i <(for f in /mnt/processed_images/$image_folder/image-%06d.jpeg; do echo "file '$f'";done) -vf "crop=trunc(iw/3)*2:trunc(ih/2)*2" -movflags +faststart /mnt/run/summary_files/${image_folder}.mp4
I have checked processed images and it is not there so why is ffmpeg looking for it?
pastebin of the failed run
https://pastebin.com/pF5ZefLf
My check that the file is not in the folder reference by the for loop so that it should never cause an error
$ ls image-005437.*
ls: cannot access image-005437.*: No such file or directory
Problem
When you run:
for f in /mnt/processed_images/$image_folder/image-%06d.jpeg; do echo "file '$f'";done
It will output:
file '/mnt/processed_images/foo/image-%06d.jpeg'
So then ffmpeg will use the sequence pattern type for the image demuxer. This expects a contiguous sequence.
Solution 1: Glob
Use a glob:
for f in /mnt/processed_images/$image_folder/*.jpeg; do echo "file '$f'";done
Now it will output each file. In this example image-000003.jpeg does not exist so it does not get listed:
file '/mnt/processed_images/foo/image-000001.jpeg'
file '/mnt/processed_images/foo/image-000002.jpeg'
file '/mnt/processed_images/foo/image-000004.jpeg'
Solution 2: Simplify and skip concat
Even better is to simplify your command by using the glob pattern type for the image demuxer within ffmpeg itself, and then you can avoid the concat demuxer:
image_folder=$1
singularity exec --bind "$work_dir":/mnt "$work_dir"/longleaf2.sif ffmpeg -pattern_type glob -framerate 25 -i "/mnt/processed_images/$image_folder/*.jpeg" -vf "crop=trunc(iw/3)*2:trunc(ih/2)*2,format=yuv420p" -movflags +faststart /mnt/run/summary_files/${image_folder}.mp4
The image demuxer glob pattern is not available for Windows users.
Added the -framerate input option for the image demuxer.
Added the format filter to make YUV 4:2:0 chroma subsampling for compatibility.
The variables have been quoted. See shellcheck.net.
FFmpeg 4.1 release branch is old. Download or compile a modern version before doing anything else.
I am trying to download 5 second samples for a list of youtube video. The traditional approach is to download the entire file with "youtube-dl" and then use "ffmpeg" to split it however you want it.
I am trying to use the following method: https://github.com/ytdl-org/youtube-dl/issues/622#issuecomment-162337869
It does work when I include the variables in the command, for example:
ffmpeg -ss 0 -i $(youtube-dl -f best --get-url https://www.youtube.com/watch?v=ySVi-0RS5vI&t=5s) -t 10 -c:v copy -c:a copy title2.mp4
However, I am having issues trying to automate the system. Specifically, I would like ffmpeg and youtube-dl to read a file and use the values. I created the file "youtube.txt" which includes the following codes:
440.8,https://www.youtube.com/watch?v=0-4wOE_DNeA,661.2,881.6,0-4wOE_DNeA
330,https://www.youtube.com/watch?v=0-AMWW6tHzw,495,660,0-AMWW6tHzw
509.2,https://www.youtube.com/watch?v=0-Rmto2rgMw,763.8,1018.4,0-Rmto2rgMw
427.6,https://www.youtube.com/watch?v=0-U53qm45cA,641.4,855.2,0-U53qm45cA
320.4,https://www.youtube.com/watch?v=0-dja9Ys4Sg,480.6,640.8,0-dja9Ys4Sg
343.6,https://www.youtube.com/watch?v=0-g_PulsqtM,515.4,687.2,0-g_PulsqtM
415.6,https://www.youtube.com/watch?v=0-nniRyn7dU,623.4,831.2,0-nniRyn7dU
431.2,https://www.youtube.com/watch?v=006BQU3BFxw,646.8,862.4,006BQU3BFxw
I am using the following command:
parallel -j 6 --colsep ',' ffmpeg -ss {1} -i $(youtube-dl -f best --get-url {2}) --t 5 -c:v copy -c:a copy {5} :::: youtube.txt
However, I get the following errors:
ERROR: '{2}' is not a valid URL. Set --default-search "ytsearch" (or run youtube-dl "ytsearch:{2}" ) to search YouTube
--t: No such file or directory
Would you mind helping me?
Thanks!
Here's a solution using python2, so this should work on the python version shipped with MacOS. My original bash script was choking on the csv line reading for some reason. Add this script to getvids.py in the same directory as your youtube.txt, then run chmod +x getvids.py and when you're ready to turn it loose ./getvids.py
#!/usr/bin/python
import csv, os
with open('youtube.txt') as csv_file:
csv_reader = csv.reader(csv_file, delimiter=',')
for row in csv_reader:
starttimes = [row[0], row[2], row[3]]
yturl = os.popen('youtube-dl -f best --get-url '+row[1]).read().strip()
for thistime in starttimes:
print(row[1] + ' #time='+thistime)
os.system('ffmpeg -hide_banner -loglevel panic -ss '
+thistime+' -i "'+yturl+'" -t 5 -c copy '+row[4]+'['+thistime+'s].mp4')
I am trying to encode an external HLS (m3u8) link into MPEG-TS over UDP via ffmpeg with this command:
ffmpeg -re -i http://example.com/index400.m3u8 -vcodec copy -acodec copy -f mpegts udp://127.0.0.1:10000?pkt_size=1316
Currently I am executing the command directly inside a terminal which I keep open on my Centos server. However, and after some time (volatile), I get the following error :
Failed to resolve hostname example.com: Temporary failure in name resolution
[hls,applehttp # 0x349b420] Failed to reload playlist 0
My question is, how can I run this command in a bash script or upstart or … so that whenever it unexpectedly stops, it automatically restarts.
I prefer not to use third parties like monit, and please be explicit in writing the script with annotation for newbies, I am not well experienced on this.
Turned out to be simpler than I thought. For future reference, this is what I did, in a terminal:
Create a new script:
vi test.sh
Insert the following code:
#!/bin/bash
while :
do
echo `ffmpeg -re -i http://example.com/index400.m3u8 -vcodec copy -acodec copy -f mpegts udp://127.0.0.1:10000?pkt_size=1316`
done
Press Esc W Q Enter to save and exit.
Execute the following commands:
chmod +x test.sh
./test.sh
And voilà, ffmpeg will automatically restart when an error occurs.
I'm trying to increase the volume of my input .wav file by means of the output_volume option within the avconv command. I would like to increase the volume by 6 dBs similarly as demonstrated in the man page.
I have my command in a script format
for i in *.wav; do avconv -i "$i" output_volume=volume=6dB:precision=fixed "$i{%.*}".mp3;done
But I receive the following error. I see many search results pertaining to FFmpeg but I not helpful towards avconv
Unable to find a suitable output format for 'output_volume=volume=6dB:precision=
fixed'
The general sytanx from the man page is:
avconv [global options] [[infile options][‘-i’ infile]]... {[outfile options] outfile}...
I having trouble interpreting the documentation..
Try something like this:
for i in *.wav; do
avconv -i "$i" -af volume=6dB:precision=fixed "$i{%.*}".mp3
done
I'm trying to set up a service that will output .ismv files for smooth streaming.
Currently I'm using the following command to start the transcode:
ffmpeg.exe -i <infile> -movflags frag_keyframe -f ismv <outfile>
As I understand it I don't need to add isml to the movflags because I don't want to stream it but the actual output file.
According to the documentation I already should use the empty_moov and separate_moof flags because I'm using the ismv format. This however does not generate the .ism and .ismc file.
There is a part about smoothstreaming, but if I use -f smoothstreaming ffmpeg won't run.
I did find a win32 binary for ismindex which should generate the manifest files, but when I run it I don't get any useful output.
What are the correct parameters for ffmpeg so that it creates all the files at the same time?
ismindex [-split] [-ismf] [-n basename] [-path-prefix prefix] [-ismc-prefix prefix] [-output dir] file1 [file2] ...
To generate the manifest files you would do:
ismindex -n <basename> input.ismv
The smoothstreaming muxer accepts a directory as output.
ffmpeg [...] -f smoothstreaming <dir>