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As other people mentioned, putting -ss before (much faster) or after (more accurate) the -i makes a big difference. The section "Fast And Accurate Seeking" on the ffmpeg seek page tells you how to get both, and I have used it, and it makes a big difference. Basically you put -ss before AND after the -i, just make sure to leave enough time before where you want to start cutting to have another key frame. Example:If you want to make a 1-minute clip, from 9min0sec to 10min 0sec in Video.mp4, you could do it both quickly and accurately using:


For .mp4 files (which I obtained from a 50 minute tv episode, downloadable only in three parts, as three .mp4 video files) the following was an effective solution for Windows 7, and does NOT involve re-encoding the files.

The batch file, and ffmpeg.exe, must both be put in the same folder as the .mp4 files to be joined. Then run the batch file. It will typically take less than ten seconds to run.. is because "ffmpeg does not support PCM (pcm_alaw, pcm_s16le, etc) in the MP4 container." See here: codec not currently supported in container and here. So, run time ffmpeg -f concat -safe 0 -i inputs.txt -c:v copy -c:a aac output.mp4 instead, to re-encode the audio into AAC format. Or, run time ffmpeg -f concat -safe 0 -i inputs.txt -c copy output.mkv to write into a .mkv container instead of into a .mp4 container.

I had this uploading problem but the cause was different. In my case it was because the CTTS was invalid even though the file played fine locally. You can check for errors in the file with ffprobe media_file.mp4

You almost certainly don't want to use this format, since it isn't supported in a meaningful way by any major browsers, and is quite obsolete. Files of this type should have the extension .mp4v, but sometimes are inaccurately labeled .mp4.

The commands in the diagram above will select the video from input0.mp4 and the 3rd audio stream from input1.mkv to output.mp4. The commands do the same thing, but use different syntax to map streams:

i have client website of premium E-learning videos on wordpress. i have uploaded all the videos(MP4) in wp-content/uploads directory. i have problem since it is a premium video i want it such a way that no one can download or see the video with hitting direct file url eg. -content/uploads/2016/01/video.mp4

Note that in the above example the shortest option for overlay filter isused to end the output video at the length of the shortest input file,which in this case is input.mp4 as the GIF in this example loopsinfinitely. 041b061a72

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