![]() ![]() To get the duration with ffprobe, add the -show_entries flag and set its value to format=duration. Ffmpeg rotate video thumbnail how to#As a workaround you could hack the configure script to check for “x264_encoder_open_78” instead of “x264_encoder_open” (given that 78 is the libx264 version you use).In this tutorial, we will learn how to get the duration of a video with FFmpeg using the ffprobe utility. ![]() Now when you compile a new libx264 against an older ffmpeg the libx264 detection that relies on the symbol name fails. More recent libx264 add a version number to the method name. Older libx264 provide a method x264_encoder_open which older ffmpeg versions do check for. Incompatible combination of ffmpeg and libx264.If necessary use LD_LIBRARY_PATH or –extra-ldflags to change the search order. Avoid this and uninstall them if possible. Check wether you have different ones installed. Unintended library is used for linking.Include the log file "config.err" produced by configure as this will help If the latest version fails, report the problem to the If you think configure made a mistake, make sure you are using the latest An ffmpeg command line for MPEG-2 TS can look like this: The parameter for this depends on the output video codec. ![]() To allow frame-exact splitting on problematic input files the easiest way is to blow them up to consist only of I-frames. As the segmenter only supports transport stream only MPEG-2 TS and MPEG-4 TS do make sense. When using the Apple segmenter the only safe way to split files is to convert into an intermediate format which allows frame-exact splitting. missing audio+video between otherwise audio-synchronous consecutive segments.missing video frames at the start of each segment.asynchronous audio in some or all segments.Wether you split the file using ffmpeg or the Apple segmenter tool you often end up with The problem lies with frame exact splitting of arbitrary video input material. When preparing videos for Apples HTTP streaming for iPad/iPhone you need to split your video into 10s chunks and provide a play list for Quicktime to process. The commands above were tested using ffmpeg 0.5/0.6 Frame Exact Splitting ![]() Update: Also check the comment of an anonymous user below mentioning that he needed a different mapping with a more recent version of ffmpeg. These parameters need to be added after the second input file and before the mapping options. I added “-vcodec copy -acodec copy” to avoid reencoding the video and loose quality. The input file is required to have exactly one video channel at position 0 and one audio channel at position 1. The “-itsoffset” option indicates an offset (3 seconds in the example) for the following input file. The difference is in the mapping parameters which specify which of the two supplied input files to map on which output channel. For example:įfmpeg -i input.flv -itsoffset 00:00:03.0 -i input.flv -vcodec copy -acodec copy -map 1:0 -map 0:1 output_shift3s.flv This uses the libfaad AAC decoder, which is said to be a bit slower than the ffmpeg-builtin, but which decodes the AAC without complaining. Ffmpeg rotate video thumbnail upgrade#Solution: Upgrade to latest ffmpeg and faad library version and add “ -acodec libfaad “ in front of the “-i” switch. In fact it could well be that they’ll handle it as an invalid input file. It doesn’t look like this will be handled by ffmpeg very soon. This is documented in various bugs (see ffmpeg issues #800, #871, #999, #1733…). The reason for the problem as I understood it is that the ffmpeg-builtin AAC codec cannot handle an audio stream stream with index “1.0”. Still the input video is playable in all standard players (VLC, in Windows…). The resulting video is either unplayable or has no sound. The message “Error while decoding stream #0.0” is repeated continuously. Stream #0.1(eng): Audio: libmp3lame, 22050 Hz, 2 channels, s16, 64 kb/sĬhannel element 1.0 is not allocated ![]()
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