Ffmpeg flv non monotone time stamps for iphone

Dec 30, 2008 the main issue we ran into was finding the right parameters for ffmpeg. You cannot run executables from an app on a nonjailbroken phone. Im trying to achieve a lossy jpeg 2000 output with ffmpeg, but no success so far. My understanding of a monotonic function doesnt preclude two identical timestamps. Batch conversion supported, saving your precious time. Contribute to s avideo datetime stamp development by creating an account on github. This often causes problems such as stuttering playback, unwanted artifacts, audio distortion, a luminance shift, or a simple refusal to open the video andor audio. Decoder time stamps and even if ffmpeg is told to ignore dts and create new ones they cause problems. In his post, he mentions i also had to apply a small fix in utils. Lossy output with ffmpeg jpeg 2000 video production stack.

You have built the ffmpeg binary which can run on an iphone. Debugging with strace finally showed what the stupid thing was doing. The videos converted from m4v to mp4 are playing very well in both iphone and ipod but the videos converted from flv to mp4 does not work in ipod but does in iphone. But some hunting revealed that mencoder should be able to generate timestamps without reencoding. For the vcodec option, i used mpeg4 instead of libx264, and there were no pauses between the resulting mp4 video segments. It supports the most obscure ancient formats up to the cutting edge. Trim video and concatenate using ffmpeg getting non.

I had to use top 1 for one reencode of an interlaced mpeg that had mixed tffbff according to gspot. The solution i would recommend would be to display a kind of web view, and then put the video embedded in the html. It took me quite some time to figure out how to actually make good use of it. This whole time, i thought ffmpeg was seeking by the pts. As is the case with most open source projects, the documentation for ffmpeg is sparse. Another encoder with comprehensive configuration support. Ffmpeg basics by frantisek korbel, describes various ffmpeg features and common tasks ffmpeg beginners handbook chinese version by steven liu, describes ffmpeg common use method in chinese, from command line to api usage. Error, non monotone timestamps in ffmpeg videohelp forum. That is negative values are earlier in the file, 0 is at eof.

Ffmpeg is the home to libavcodec, a codec library used by a large spectrum of programs, and libavformat, a mux and demux library for containers. Then, from your app, call the relevant functions directly, mimicing what the ffmpeg program does. Guide batch convert flv to mp4 losslessly with ffmpeg obs. Hello, i hope you can help me, i receive the error in subject error, non monotone timestamps when i try to convert by ffmpeg a mp4. This time, ffmpeg was kind enough to fail, informing me that, error, non monotone timestamps 0. Jul 09, 2019 ffmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. The ffmpeg wiki provides some useful up to date guidance on how to encode h. Non monotonous dts on concat ffmpeg ask question asked 5 years ago. Ffmpeg can write almost any format and can read many more.

You can set metadata with ffmpeg via the metadata parameter. That didnt work although it certainly didnt destroy any data. First let me start off by saying that i am newcomer to ffmpeg so please be patient with my lack of knowledge. Hi all, i am trying to transcode a flv file in to mp4 using ffmpeg. There is an issue with audiovideo sync coming from mts clips having different audio and video length. This is sometimes required to avoid non monotonically increasing timestamps when copying video. The top command line option for ffmpeg has to do with tff, bff or automatic field selection for values 1, 0, and 1. Gentoo forums view topic extracting audio from a file. So you would have to compile the library, and link against that. I found the date attribute by setting the year via vlc and dumping the metadata with ffmpeg.

The following lines are showing the first 25 pts and dts values of the video stream, which i get when grabbing frame after frame from the source file the values are already adjusted with an offset to start at 0. Mpeg4 avc can support the color formats you asked for 3. With twixl you can create native ios and android apps, publish both indesign as well as webbased content, integrate web services, tie in with your cms, publish an rss feed and manage entitled users. Ffmpeg has so much power though that reading the docs can make you go cross eyed. But if the cuts overlap the switch between movie and commercial ffmpeg hurls out a large number of non monotonous dts. May 25, 2017 download the ffmpeg executable the statically linked one so it has what it needs in 1 file and paste it inside your system32 folder so it can execute from everywhere. Documentation was a complete disaster, and errormessages misleading. These are my field notes on some ffmpeg commands that i use for this and should be a good starting place. Every hours 14 minutes from beginning of recording each ffmpeg stops recording with messages like nonmonotonous dts in output stream 0. Using ffmpeg to reliably convert videos to mp4 for iphone. Once you have a working version of ffmpeg it is time to create an x264 encoded stream that will work with the iphone.

You cannot run executables from an app on a non jailbroken phone. Without more information, its not possible to determine if the problem is in the source file, in the build of ffmbc youre using, or in both. A protip by dmcrodrigues about objectivec, c, ios, and ffmpeg. Video production stack exchange is a question and answer site for engineers, producers, editors, and enthusiasts spanning the fields of video, and media creation. If you want to use ffmpeg to work with h264, you have to deal with both the ffmpeg licenses and the mpeg laheld patent. While ffmpeg was able to read the input, it was unable to produce a proper multi language audio output. I convert mp4 to ts, which has a hard coded spec frequency of 90 000 hz. This may result in incorrect timestamps in the output file. A friend sent me a nice script to create a time lapse video from existing jpegs using ffmpeg, but it didnt work. Im running into problems when using ffmpeg to pull a live rtmp stream, reencode it, and push the result back out to another location.

Dec 20, 2011 besides, you have to spend a lot of time in trying and evaluating which one really works. If we can prove its just an mp3 vs aac audio issue in fmle we will just buy the aac plugin from mainconcept and be happy. And it doesnt matter when i started every ffmpeg intance. Ffmpegusers help time shifting frame time stamps for. I am able to get frame time stamp for a video using ffprobe using the following code. How to convert iphone video to mp4 on mac quickly with steps. Feb 27, 2020 it converts iphone video to mp4 quickly, or to other more than 150 formats. Like i said wirecast seems to produce files that appear identical, but can actually be split by ffmpeg without the non monotone errors appearing after several minutes of recording. There are three output files specified, and for the first two, no map options are set, so ffmpeg will select streams for these two files automatically out1. Only if you can play it with ffplay, you can use ffmpeg. Try dvdfab and download streaming video, copy, convert or make blurays,dvds.

Mov is the file extension used for apple quicktime video files. As reimar points out in the bug report, this is not the case. Mp4s support the year attribute according to this, but i only got it to work with the date field which is shown in vlc if it is only a year and in mplayer and winamp without a problem as full date. Aug 28, 2019 software for non developers to create native ios and android apps. The ffmpeg license will require you to redistribute ffmpeg source, whereas using h264 in any form will require. Ffmpeg is an actual implementation of a lot of video related technologies, which a. Using this method seems to solve at least our issues with non monotone timestamps as well as fixes. I tried to encode with ffmpeg instead, but it only produced an mpg file even with elementary streams turned on which i then cant apply a 3. Ffmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. This tells ffmpeg to copy the video and audio without reencoding. Using ffmpeg to encode movies for the iphone credera.

The problem is that the dts can jump when the source stream is switched within the server that is providing the source for ffmpeg. Besides, you have to spend a lot of time in trying and evaluating which one really works. General users should always use ffmpeg from the current git master branch the latest code available when encountering an issue the first thing to do is check to see if you are using a build from git master. Ffmpegusers reset timestamps for mp4 video segments. How to convert iphone video to mp4 on mac quickly with. That makes it an ideal tool to use to converttranscode file formats from one to another. Operation not permitted i tried to demux and then mux them. Another example is the setpts filter, which only sets timestamps and. No matter if they were designed by some standards committee, the community or a corporation. Does the reply to the message cantrip have a time distance limit. He continues to contribute to ffmpeg, and has fixed some bugs in libswscale after gsoc has ended. The same issue happens when running ffmpeg on the attached file which. The result is not complete, but it shows that data is in json format and also it starts from frame one and goes to the end of video. The source for this binary is taken straight from the latest svn trunk so dont expect it to work for anything other than explained in this post.

For the record, mkvmerge still has some issues with mpeg2 and mpeg1 video, so it may create problematic mkvs even when the original streams arent b0rked as for ffmbc, well, the ffmpeg sourcecode is wellknown for its. Flv streaming on iphone with ffmpeg stack overflow. Mar 17, 2016 probably the easiest to follow tutorials for ffmpeg is ffmpeg tutorial it may be a tad outdated but it does give you the general idea of what is involved. Lossy output with ffmpeg jpeg 2000 video production. Avfoundation is the currently recommended framework by apple for streamgrabbing on osx 10. Those are the errors that show up using that older build but the file still turns out fine. I can play it in itunes, meaning i have the password, but i want to put the video on my non iphone. As you said that im searching for a way, to get the ismv and isma fragments stored by the ndvr plugin into another format, e. Install ffmpeg for linux using the snap store snapcraft. Force conversion from monotonic to absolute timestamps.