尝试将PCMU编码的帧写入avi/mov文件时,avformat_write_header返回错误代码 [英] avformat_write_header return error code when trying to write PCMU encoded frame into avi/mov file
问题描述
我正在尝试使用下面的程序将PCMU G.711加密的数据写入avi
多媒体容器,该程序产生Error occurred when opening output file: Operation not permitted
,而在使用mov
容器时,它产生Error occurred when opening output file: Invalid argument
.我将AV_CODEC_ID_PCM_U16LE
设置为输出格式的音频编解码器,并将AV_SAMPLE_FMT_S16
设置为示例格式.
I am trying to write PCMU G.711 enocded data into avi
multimedia container using below program which yields Error occurred when opening output file: Operation not permitted
and when using mov
container, it yields Error occurred when opening output file: Invalid argument
. I set AV_CODEC_ID_PCM_U16LE
as audio codec of output format and AV_SAMPLE_FMT_S16
as sample format.
这是什么问题?预先感谢!
What's the problem here? Thanks in advance!
推荐答案
您正在编写AV_CODEC_ID_PCM_U16LE,它不是G711,而是原始PCM未签名的16位数据. AVI/mov不支持此功能(它们支持带符号的16位PCM数据或8位无符号的PCM数据,但不支持无符号的16位PCM数据).因此,这就是您收到此错误的原因.但是无论如何,您都不想使用它,因为它不是G711.
You're writing AV_CODEC_ID_PCM_U16LE, which isn't G711, but raw PCM unsigned 16bits data. AVI/mov don't support this (they support signed 16 bits PCM data, or 8 bits unsigned PCM data, but not unsigned 16-bits PCM data). So that's why you're getting this error. But anyway, you don't want to use that anyway, since it's not G711.
G711有两种类型:mu-law或a-law,因此您必须确定要使用的两种类型,然后使用正确的AVCodecID(AV_CODEC_ID_PCM_ALAW或CODEC_ID_PCM_MULAW).
G711 comes in two types: mu-law or a-law, so you have to decide which of the two you want, and then use the correct AVCodecID (AV_CODEC_ID_PCM_ALAW or CODEC_ID_PCM_MULAW).
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