Search found 27 matches

by jiapei100
Fri Aug 10, 2012 7:28 am
Forum: Developement with FFmpeg
Topic: error LNK2001: unresolved external symbol _av_pix_fmt_descri
Replies: 3
Views: 2294

error LNK2001: unresolved external symbol _av_pix_fmt_descri

Hi, all: First, my environment: Windows 7 + Visual Studio 2010 + libav 0.8.3 Release. Before the final success, I got this final error: error LNK2001: unresolved external symbol _av_pix_fmt_descriptors It seems the solution can be found at http://ffmpeg.arrozcru.org/forum/viewtopic.php?f=8&t=1514 Yo...
by jiapei100
Sat Jul 28, 2012 11:32 am
Forum: Usage
Topic: How to analyze video files?
Replies: 1
Views: 1753

How to analyze video files?

Hi, all: Again, I'd love to ask this question. It's convenient for me to encode a video file from multiple .jpg files, for example: $ ffmpeg -i %3d.jpg video.mpg However, how can I use ffmpeg command (or other commands) to analyse how many frames in such a .mpg file? It may have something to do with...
by jiapei100
Mon Jul 16, 2012 10:33 pm
Forum: Compiling
Topic: choose_sample_fmts,choose_sample_rates,choose_channel_layout
Replies: 4
Views: 2910

Re: choose_sample_fmts,choose_sample_rates,choose_channel_la

Wow, Hi, rogerdpack, thanks for your prompt reply. I just want to compile the single file ffmpeg.c. In fact, I just want to dig into how all the video files are decoded by analyzing ffmpeg.c . Cheers Pei They're probably some "internal" method that ffmpeg uses. I doubt they're needed/accessible outs...
by jiapei100
Mon Jul 16, 2012 3:25 am
Forum: Compiling
Topic: choose_sample_fmts,choose_sample_rates,choose_channel_layout
Replies: 4
Views: 2910

choose_sample_fmts,choose_sample_rates,choose_channel_layout

Hi, all: Happen to notice these 3 functions choose_sample_fmts() choose_sample_rates() choose_channel_layouts() in file ffmpeg.c However, I'm not able to locate where their definitions are. Actually, by "grep", the unique location of these three functions are in ffmpeg.c only. Namely, I can find the...
by jiapei100
Sun Jun 03, 2012 6:10 am
Forum: Usage
Topic: Problems to decode H.264 ...
Replies: 1
Views: 1456

Problems to decode H.264 ...

For the code CODEC_ID_H264 1) av_read_frame() seems always return a value < 0 at the wrong place. 2) decoding_encoding.c always fail to decode the video file due to len < 0, where len = avcodec_decode_video2(c, picture, &got_picture, &avpkt); Have no idea where I'm wrong. The testing file is at http...
by jiapei100
Sat Jun 02, 2012 12:19 pm
Forum: Usage
Topic: decoding_encoding.c example of current ffmpeg git.
Replies: 1
Views: 1604

decoding_encoding.c example of current ffmpeg git.

Hi, all: 1) The example code "decoding_encoding.c" in current ffmpeg release, say, FFmpeg 0.11 "Happiness", seems to be able to decode or encode audio and video streams respectively. However, is there any sample code for me to use for decoding both streams at the same time? 2) Does current "decoding...
by jiapei100
Tue Mar 27, 2012 10:50 pm
Forum: Usage
Topic: AVFrame quality and AVStream quality?
Replies: 0
Views: 2498

AVFrame quality and AVStream quality?

AVStream used to have a member variable quality, but now missing.
I'm just wondering how to assign "AVFrame quality" from now on, when using the newest ffmpeg?


Thank you very much.

Best Regards
Pei