On Wed, Mar 1, 2023 at 4:07 PM Ferdi Scholten <[email protected]> wrote:
> Hi, > > if I invoke ffmpeg on an M2V MPEG-2 elementary stream, I get "N/A" for > the > > duration. I guess this is because this file doesn't contain a header that > > contains the duration. Is it possible to force ffmpeg to parse the entire > > file to obtain the duration? > > > > Full command line and output: > > > > ffmpeg -i > > > /Users/krueger/lesspain/samples/software/compressor/compressor_dvd_mpeg2_480_24p.m2v > > > > ffmpeg version N-109938-g67fd1b79e7 Copyright (c) 2000-2023 the FFmpeg > > developers > > built with Apple clang version 11.0.0 (clang-1100.0.33.17) > > configuration: > > libavutil 58. 3.100 / 58. 3.100 > > libavcodec 60. 5.100 / 60. 5.100 > > libavformat 60. 4.100 / 60. 4.100 > > libavdevice 60. 2.100 / 60. 2.100 > > libavfilter 9. 4.100 / 9. 4.100 > > libswscale 7. 2.100 / 7. 2.100 > > libswresample 4. 11.100 / 4. 11.100 > > Input #0, mpegvideo, from > > > '/Users/krueger/lesspain/samples/software/compressor/compressor_dvd_mpeg2_480_24p.m2v': > > Duration: N/A, bitrate: N/A > > Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, smpte170m, > > progressive), 720x480 [SAR 32:27 DAR 16:9], 30 fps, 59.94 tbr, 1200k tbn > > Side data: > > cpb: bitrate max/min/avg: 7700000/0/0 buffer size: 1835008 > vbv_delay: > > N/A > > At least one output file must be specified > > > > Thanks, > > Robert > > > You can use -analyzeduration 10000000M -probesize 10000000M for example > to scan more of the input file. like this: > > ffmpeg -i -analyzeduration 10000000M -probesize 10000000M > /Users/krueger/lesspain/samples/software/compressor/compressor_dvd_mpeg2_480_24p.m2v > > Thanks. I tried that and used values that were way beyond the actual file duration and size and that didn't change the result, i.e. I still get "N/A" for the duration. It looks a bit as if getting exact duration by iterating through the packets isn't supported at all. Can someone confirm this? Thanks, Robert _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
